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• Voice Recognition Connection problem

  - by user244190

  I,m trying to work through and test a Voice Recognition example based on the VoiceRecognition.java example at http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/app/VoiceRecognition.html but when click on the button to create the activity, I get a dialog that says Connection problem. My Manifest file is using the Internet Permission, and I understand it passes the to the Google Servers. Do I need to do anything else to use this. Code below UPDATE 2: Thanks to Steve, I have been able to install the USB Driver and debug the app directly on my Droid. Here is the LogCat output from clicking on my mic button: 03-08 18:36:45.686: INFO/ActivityManager(1017): Starting activity: Intent { act=android.speech.action.RECOGNIZE_SPEECH cmp=com.google.android.voicesearch/.IntentApiActivity (has extras) } 03-08 18:36:45.686: WARN/ActivityManager(1017): Activity is launching as a new task, so cancelling activity result. 03-08 18:36:45.787: DEBUG/NetworkLocationProvider(1017): setMinTime: 120000 03-08 18:36:45.889: INFO/ActivityManager(1017): Displayed activity com.google.android.voicesearch/.IntentApiActivity: 135 ms (total 135 ms) 03-08 18:36:45.905: DEBUG/NetworkLocationProvider(1017): onCellLocationChanged [802,0,0,4192,3] 03-08 18:36:45.951: INFO/MicrophoneInputStream(1429): Starting voice recognition with audio source VOICE_RECOGNITION 03-08 18:36:45.998: DEBUG/AudioHardwareMot(990): Codec sampling rate already 16000 03-08 18:36:46.092: INFO/RecognitionService(1429): ssfe url=http://www.google.com/m/voice-search 03-08 18:36:46.092: WARN/RecognitionService(1429): required parameter 'calling_package' is missing in IntentAPI request 03-08 18:36:46.115: DEBUG/AudioHardwareMot(990): Codec sampling rate already 16000 03-08 18:36:46.131: WARN/InputManagerService(1017): Starting input on non-focused client com.android.internal.view.IInputMethodClient$Stub$Proxy@4487d240 (uid=10090 pid=3132) 03-08 18:36:46.131: WARN/IInputConnectionWrapper(3132): showStatusIcon on inactive InputConnection 03-08 18:36:46.248: WARN/MediaPlayer(1429): info/warning (1, 44) 03-08 18:36:46.334: DEBUG/dalvikvm(3206): GC freed 3682 objects / 369416 bytes in 293ms 03-08 18:36:46.358: WARN/MediaPlayer(1429): info/warning (1, 44) 03-08 18:36:46.412: WARN/MediaPlayer(1429): info/warning (1, 44) 03-08 18:36:46.444: WARN/MediaPlayer(1429): info/warning (1, 44) 03-08 18:36:46.475: WARN/MediaPlayer(1429): info/warning (1, 44) 03-08 18:36:46.506: WARN/MediaPlayer(1429): info/warning (1, 44) 03-08 18:36:46.514: INFO/MediaPlayer(1429): Info (1,44) 03-08 18:36:46.514: INFO/MediaPlayer(1429): Info (1,44) 03-08 18:36:46.514: INFO/MediaPlayer(1429): Info (1,44) 03-08 18:36:46.514: INFO/MediaPlayer(1429): Info (1,44) 03-08 18:36:46.514: INFO/MediaPlayer(1429): Info (1,44) 03-08 18:36:46.514: INFO/MediaPlayer(1429): Info (1,44) The line that concerns me is the warning of the missing parameter calling-package. UPDATE: Ok, I was able to replace my emulator image with one from HTC that appears to come with Google Voice Search, however now when I run from the emulator, i'm getting an Audio Problem message with Speak Again or Cancel buttons. It appears to make it back to the onActivityResult(), but the resultCode is 0. Here is the LogCat output: 03-07 20:21:25.396: INFO/ActivityManager(578): Starting activity: Intent { action=android.speech.action.RECOGNIZE_SPEECH comp={com.google.android.voicesearch/com.google.android.voicesearch.RecognitionActivity} (has extras) } 03-07 20:21:25.406: WARN/ActivityManager(578): Activity is launching as a new task, so cancelling activity result. 03-07 20:21:25.968: WARN/ActivityManager(578): Activity pause timeout for HistoryRecord{434f7850 {com.ikonicsoft.mileagegenie/com.ikonicsoft.mileagegenie.MileageGenie}} 03-07 20:21:26.206: WARN/AudioHardwareInterface(554): getInputBufferSize bad sampling rate: 16000 03-07 20:21:26.256: ERROR/AudioRecord(819): Recording parameters are not supported: sampleRate 16000, channelCount 1, format 1 03-07 20:21:26.696: INFO/ActivityManager(578): Displayed activity com.google.android.voicesearch/.RecognitionActivity: 1295 ms 03-07 20:21:29.890: DEBUG/dalvikvm(806): threadid=3: still suspended after undo (s=1 d=1) 03-07 20:21:29.896: INFO/dalvikvm(806): Uncaught exception thrown by finalizer (will be discarded): 03-07 20:21:29.896: INFO/dalvikvm(806): Ljava/lang/IllegalStateException;: Finalizing cursor android.database.sqlite.SQLiteCursor@435d3c50 on ml_trackdata that has not been deactivated or closed 03-07 20:21:29.896: INFO/dalvikvm(806): at android.database.sqlite.SQLiteCursor.finalize(SQLiteCursor.java:596) 03-07 20:21:29.896: INFO/dalvikvm(806): at dalvik.system.NativeStart.run(Native Method) 03-07 20:21:31.468: DEBUG/dalvikvm(806): threadid=5: still suspended after undo (s=1 d=1) 03-07 20:21:32.436: WARN/IInputConnectionWrapper(806): showStatusIcon on inactive InputConnection I,m still not sure why I,m getting the Connect problem on the Droid. I can use Voice Search ok. I also tried clearing the cache, and data as described in some posts, butstill not working?? /** * Fire an intent to start the speech recognition activity. */ private void startVoiceRecognitionActivity() { Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH); intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM); intent.putExtra(RecognizerIntent.EXTRA_PROMPT, "Speech recognition demo"); startActivityForResult(intent, VOICE_RECOGNITION_REQUEST_CODE); } /** * Handle the results from the recognition activity. */ @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode == VOICE_RECOGNITION_REQUEST_CODE && resultCode == RESULT_OK) { // Fill the list view with the strings the recognizer thought it could have heard ArrayList<String> matches = data.getStringArrayListExtra( RecognizerIntent.EXTRA_RESULTS); mList.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, matches)); } super.onActivityResult(requestCode, resultCode, data); }

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• Facebook Connect login button not rendering

  - by tloflin

  I'm trying to implement a Facebook Connect Single Sign-on site. I originally just had a Connect button (<fb:login-button>), which the user had to click every time they wanted to sign in. I now have the auto login and logout features working. That is, my site will detect a logged-in Facebook account and automatically authenticate them if it can find a match to one of my site's user accounts, and automatically deauthenticate if the Facebook session is lost. I also have a manual logout button that will log the user out of both my site and Facebook. All of those are working correctly, but now my original Connect button is intermittently not being rendered correctly. It just shows up as the plain XHTML (ie., it looks like plain text--not a button--and is unclickable), and no XFBML is applied. Here is the basic code: On every page: <body> {...} <script src="http://static.ak.connect.facebook.com/js/api_lib/v0.4/FeatureLoader.js.php" type="text/javascript"></script> <script type="text/javascript> FB.init('APIKey', '/xd_receiver.htm'); var isAuth; // isAuth determines if the user is authenticated on my site // it should be true on the logout page, false on the login page FB.ensureInit(function(){ var session = FB.Facebook.apiClient.get_session(); if (session && !isAuth) { PageMethods.FacebookLogin(session.uid, session.session_key, FBLogin, FBLoginFail); // This is an AJAX call that authenticates the user on my site. } else if(!session && isFBAuth) { PageMethods.FacebookLogout(FBLogout, FBLogoutFail); // This is an AJAX call that deauthenticates the user on my site. } // the callback functions do nothing at the moment }); </script> {...} </body> On the login page: (this page is not visible to logged in users) <body> {...} <script src="http://static.ak.connect.facebook.com/js/api_lib/v0.4/FeatureLoader.js.php" type="text/javascript"></script> <script type="text/javascript> FB.init('APIKey', '/xd_receiver.htm'); {...} // auto-auth code as on every page </script> <!-- This is the button that fails to render --> <fb:login-button v="2" onlogin="UserSignedIntoFB();" size="large" autologoutlink="true"><fb:intl>Login With Your Facebook Account</fb:intl></fb:login-button> <script type="text/javascript"> function UserSignedIntoFB() { {...} // posts back to the server which authenticates the user on my site & redirects } </script> {...} </body> On the logout page: (this page is not visible to logged out users) <body> {...} <script src="http://static.ak.connect.facebook.com/js/api_lib/v0.4/FeatureLoader.js.php" type="text/javascript"></script> <script type="text/javascript> FB.init('APIKey', '/xd_receiver.htm'); {...} // auto-auth code as on every page </script> <script type="text/javascript"> function FBLoggedOut() { {...} // posts back to the server which deauthenticates the user on my site & redirects to login } function Logout() { if (FB.Facebook.apiClient.get_session()) { FB.Connect.logout(FBLoggedOut); // logs out of Facebook if it's a Facebook account return false; } else { return true; // posts back if it's a non-Facebook account & redirects to login } } </script> <a onclick="return Logout();" href="postback_url">Sign Out</a> {...} </body> Some things I've already looked at: The automatic login and logout are working great. I can log in and out of Facebook on another tab and my site will notice the session changes and update accordingly. The logout seems to be working fine: when clicked, it deauthenticates the user and logs them out of Facebook, as intended. The issue seems to usually happen after a Facebook user is logged out, but it happens somewhat intermittently; it might happen before they ever login, and it goes away after a few minutes/refreshes. Some cookies are left over after the login/logout process, but deleting them does not fix the issue. Restarting the browser does not fix the issue. The user is definitely logged out of Facebook and my site when the problem occurs. I've checked for Facebook sessions and site authentication. All external script calls are being served up correctly. I have a suspicion that there's something else I need to be doing upon logout (like clearing session or cookies), but according to everything I've read about Facebook Connect, all I need to do is call the logout function (and deauthenticate on my server-side). I'm really at a loss; does anybody have any ideas what could be wrong?

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• IE6 + IE7 CSS problem with overflow hidden

  - by googletorp

  So I have created a slider for a homepage, that slides some images with a title and teaser text using jQuery. Everything works fine, and I went to check IE and found that IE 6 and 7 kills my slider css completely. I can't figure out why, but for some reason I can't hide the non active slides with overflow: hidden; I've tried tweaking the css back and forth, but haven't been able to figure out what's causing the problem. I've recreated the problem in a more isolated html page. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="da" lang="da" dir="ltr"> <head> <style> body { width: 900px; } .column-1 { width: 500px; float: left; } .column-2 { width: 200px; float: left; } .column-3 { width: 200px; float: left; } h4 { font-size: 16px; margin: 0 0 5px; } p { margin: 5px 0; } ul { margin: 0; padding: 0; width: 2000px; left: -499px; overflow: hidden; position: relative; } li { list-style: none; display: block; float: left; } .item-list { overflow: hidden; width: 499px; } img { display: block; } .infobox { background: black; padding: 10px 13px; margin-top: -74px; height: 54px; width: 473px; color: white; position: absolute; } .first { display: block; } </style> </head> <body> <div class="column-1"> <div class="item-list clearfix"> <ul> <li class="first"> <div class="node-slide"> <img src="http://www.hanselman.com/blog/content/binary/lolcats-funny-pictures-leroy-jenkins.jpg" /> <div class="infobox"> <h4>Title 1</h4> <p>Teaser 1</p> </div> </div> </li> <li> <div class="slide"> <img src="http://www.hanselman.com/blog/content/binary/lolcats-funny-pictures-leroy-jenkins.jpg" /> <div class="infobox"> <h4>Title 2</h4> <p>Teaser 2</p> </div> </div> </li> <li class="last"> <div class="slide"> <img src="http://www.hanselman.com/blog/content/binary/lolcats-funny-pictures-leroy-jenkins.jpg" /> <div class="infobox"> <h4>Title 3</h4> <p>Teaser 3</p> </div> </div> </li> </ul> </div> </div> <div class="column-2"> ... </div> <div class="column-3"> ... </div> </body> </html> Any ideas as to why IE wont hide images outside div with class item-list?

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• Compilation error when using boost serialization library

  - by Shakir

  I have been struggling with this error for a long time. The following is my code snippet. //This is the header file template<typename TElem> class ArrayList { public: /** An accessible typedef for the elements in the array. */ typedef TElem Elem; friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & ptr_; ar & size_; ar & cap_; } Elem *ptr_; // the stored or aliased array index_t size_; // number of active objects index_t cap_; // allocated size of the array; -1 if alias }; template <typename TElem> class gps_position { public: typedef TElem Elem; friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & degrees; ar & minutes; ar & seconds; } private: Elem degrees; index_t minutes; index_t seconds; }; // This is the .cc file #include #include #include #include #include #include #include #include #include "arraylist.h" int main() { // create and open a character archive for output std::ofstream ofs("filename"); // create class instance // gps_position<int> g(35.65, 59, 24.567f); gps_position<float> g; // save data to archive { boost::archive::text_oarchive oa(ofs); // write class instance to archive //oa << g; // archive and stream closed when destructors are called } // ... some time later restore the class instance to its orginal state /* gps_position<int> newg; { // create and open an archive for input std::ifstream ifs("filename"); boost::archive::text_iarchive ia(ifs); // read class state from archive ia >> newg; // archive and stream closed when destructors are called }*/ ArrayList<float> a1; ArrayList<int> a2; a1.Init(22); a2.Init(21); // a1.Resize(30); // a1.Resize(12); // a1.Resize(22); // a2.Resize(22); a1[21] = 99.0; a1[20] = 88.0; for (index_t i = 0; i < a1.size(); i++) { a1[i] = i; a1[i]++; } std::ofstream s("test.txt"); { boost::archive::text_oarchive oa(s); oa << a1; } return 0; } The following is the compilation error i get. In file included from /usr/include/boost/serialization/split_member.hpp:23, from /usr/include/boost/serialization/nvp.hpp:33, from /usr/include/boost/serialization/serialization.hpp:17, from /usr/include/boost/archive/detail/oserializer.hpp:61, from /usr/include/boost/archive/detail/interface_oarchive.hpp:24, from /usr/include/boost/archive/detail/common_oarchive.hpp:20, from /usr/include/boost/archive/basic_text_oarchive.hpp:32, from /usr/include/boost/archive/text_oarchive.hpp:31, from demo.cc:4: /usr/include/boost/serialization/access.hpp: In static member function ‘static void boost::serialization::access::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive, T = float]’: /usr/include/boost/serialization/serialization.hpp:74: instantiated from ‘void boost::serialization::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive, T = float]’ /usr/include/boost/serialization/serialization.hpp:133: instantiated from ‘void boost::serialization::serialize_adl(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive, T = float]’ /usr/include/boost/archive/detail/oserializer.hpp:140: instantiated from ‘void boost::archive::detail::oserializer<Archive, T>::save_object_data(boost::archive::detail::basic_oarchive&, const void*) const [with Archive = boost::archive::text_oarchive, T = float]’ demo.cc:105: instantiated from here /usr/include/boost/serialization/access.hpp:109: error: request for member ‘serialize’ in ‘t’, which is of non-class type ‘float’ Please help me out.

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• Resolving SNAPSHOT dependencies with timestamps from Ivy

  - by bradhouse

  I am attempting to resolve timestamped SNAPSHOT dependencies with Ivy. The environment is Ant + Ivy 1.2.0 + Archiva. Archiva itself is populated from Maven2 builds. Ivy is only used to resolve dependencies (from a single, non Maven2 project). How can Ivy be configured to correctly resolve timestamped artifacts from an Archiva or m2 repository? For reference my current configuration is: ivysettings.xml looks similar to: <ivysettings> <settings defaultResolver="archiva-chain"/> <resolvers> <chain name="archiva-chain" changingPattern=".*SNAPSHOT" checkmodified="true"> <ibiblio name="archiva-internal" m2compatible="true" usepoms="true" pattern="[organization]/[module]/[revision]/[artifact]-[revision].[ext]" root="http://host:port/archiva/repository/internal"/> <ibiblio name="archiva-deploy" m2compatible="true" usepoms="true" pattern="[organization]/[module]/[revision]/[artifact]-[revision].[ext]" root="http://host:port/archiva/repository/deploy"/> <ibiblio name="archiva-snapshots" m2compatible="true" usepoms="true" pattern="[organization]/[module]/[revision]/[artifact]-[revision].[ext]" root="http://host:port/archiva/repository/snapshots"/> </chain> </resolvers> </ivysettings> The ivy.xml dependencies are simple: <ivy-module version="2.0"> <info organisation="com.myorg" module="myapp"/> <dependencies> <dependency org="com.myorg" name="myartifact" rev="1.8.0-SNAPSHOT" changing="true"/> </dependencies> </ivy-module> Ivy does not attempt to resolve a timestamped artifact. E.g. [ivy:retrieve] :: problems summary :: [ivy:retrieve] :::: WARNINGS [ivy:retrieve] module not found: com.myorg#myartifact;1.8.0-SNAPSHOT [ivy:retrieve] ==== archiva-internal: tried [ivy:retrieve] -- artifact com.myorg#myartifact;1.8.0-SNAPSHOT!myartifact.jar: [ivy:retrieve] http://host:port/archiva/repository/internal/com.myorg/myartifact/1.8.0-SNAPSHOT/myartifact-1.8.0-SNAPSHOT.jar [ivy:retrieve] ==== archiva-deploy: tried [ivy:retrieve] -- artifact com.myorg#myartifact;1.8.0-SNAPSHOT!myartifact.jar: [ivy:retrieve] http://host:port/archiva/repository/deploy/com.myorg/myartifact/1.8.0-SNAPSHOT/myartifact-1.8.0-SNAPSHOT.jar [ivy:retrieve] ==== archiva-snapshots: tried [ivy:retrieve] -- artifact com.myorg#myartifact;1.8.0-SNAPSHOT!myartifact.jar: [ivy:retrieve] http://host:port/archiva/repository/snapshots/com.myorg/myartifact/1.8.0-SNAPSHOT/myartifact-1.8.0-SNAPSHOT.jar [ivy:retrieve] :::::::::::::::::::::::::::::::::::::::::::::: [ivy:retrieve] :: UNRESOLVED DEPENDENCIES :: [ivy:retrieve] :::::::::::::::::::::::::::::::::::::::::::::: [ivy:retrieve] :: com.myorg#myartifact;1.8.0-SNAPSHOT: not found [ivy:retrieve] :::::::::::::::::::::::::::::::::::::::::::::: [ivy:retrieve] [ivy:retrieve] [ivy:retrieve] :: USE VERBOSE OR DEBUG MESSAGE LEVEL FOR MORE DETAILS There is a maven-metadata.xml in snapshots/com/myorg/myartifact: <?xml version="1.0" encoding="UTF-8"?> <metadata> <groupId>com.myorg</groupId> <artifactId>myartifact</artifactId> <versioning> <latest>1.8.0-SNAPSHOT</latest> <versions> <version>1.3.0-SNAPSHOT</version> <version>1.4.2-SNAPSHOT</version> <version>1.6.1-SNAPSHOT</version> <version>1.8.0-SNAPSHOT</version> </versions> <lastUpdated>20100303003206</lastUpdated> </versioning> </metadata> The maven-metadata.xml in snapshots/com/myorg/myartifact/1.8.0-SNAPSHOT: <?xml version="1.0" encoding="UTF-8"?> <metadata> <groupId>com.myorg</groupId> <artifactId>myartifact</artifactId> <version>1.8.0-SNAPSHOT</version> <versioning> <snapshot> <buildNumber>7</buildNumber> <timestamp>20100303.003206</timestamp> </snapshot> <lastUpdated>20100303003206</lastUpdated> </versioning> </metadata> Not all that useful, but for completeness, the files in the directory snapshots/com/myorg/myartifact/1.8.0-SNAPSHOT for the referenced snapshot: -rw-r--r-- 1 archiva archiva 240670 Mar 3 10:32 myartifact-1.8.0-20100303.003206-7.jar -rw-r--r-- 1 archiva archiva 32 Mar 3 10:32 myartifact-1.8.0-20100303.003206-7.jar.md5 -rw-r--r-- 1 archiva archiva 40 Mar 3 10:32 myartifact-1.8.0-20100303.003206-7.jar.sha1 -rw-r--r-- 1 archiva archiva 4068 Mar 3 10:32 myartifact-1.8.0-20100303.003206-7.pom -rw-r--r-- 1 archiva archiva 32 Mar 3 10:32 myartifact-1.8.0-20100303.003206-7.pom.md5 -rw-r--r-- 1 archiva archiva 40 Mar 3 10:32 myartifact-1.8.0-20100303.003206-7.pom.sha1 -rw-r--r-- 1 archiva archiva 180821 Mar 3 10:32 myartifact-1.8.0-20100303.003206-7-sources.jar -rw-r--r-- 1 archiva archiva 32 Mar 3 10:32 myartifact-1.8.0-20100303.003206-7-sources.jar.md5 -rw-r--r-- 1 archiva archiva 40 Mar 3 10:32 myartifact-1.8.0-20100303.003206-7-sources.jar.sha1

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• Android camera AVD error 100

  - by Cristian Voina

  I am trying to learn how to make a simple app in android. As background information I have only programmed in C language, no OOP. Currently I am trying turn on the camera using the indications from Android Developer site but some minor changes: - no button for capturing image. - no new activity. What I am trying to do is jut preview the camera. I will post the Code that I am using, the manifest and the LogCat. Main Activity: package com.example.camera_display; import android.app.Activity; import android.hardware.Camera; import android.os.Bundle; import android.view.Menu; import android.widget.FrameLayout; import android.widget.TextView; public class MainActivity extends Activity { private Camera mcamera; private CameraPreview mCameraPreview; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mcamera = getCameraInstance(); mCameraPreview = new CameraPreview(this, mcamera); FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview); preview.addView(mCameraPreview); } public static Camera getCameraInstance(){ Camera c = null; try { c = Camera.open(); // attempt to get a Camera instance } catch (Exception e){ // Camera is not available (in use or does not exist) } return c; // returns null if camera is unavailable } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } } CameraPreview Class: package com.example.camera_display; import java.io.IOException; import android.content.Context; import android.hardware.Camera; import android.util.Log; import android.view.SurfaceHolder; import android.view.SurfaceView; /** A basic Camera preview class */ public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback { private static final String TAG = "MyActivity"; private SurfaceHolder mHolder; private Camera mCamera; public CameraPreview(Context context, Camera camera) { super(context); mCamera = camera; // Install a SurfaceHolder.Callback so we get notified when the // underlying surface is created and destroyed. mHolder = getHolder(); mHolder.addCallback(this); // deprecated setting, but required on Android versions prior to 3.0 mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); } public void surfaceCreated(SurfaceHolder holder) { // The Surface has been created, now tell the camera where to draw the preview. try { mCamera.setPreviewDisplay(holder); mCamera.startPreview(); } catch (IOException e) { Log.d(TAG, "Error setting camera preview: " + e.getMessage()); } } public void surfaceDestroyed(SurfaceHolder holder) { // empty. Take care of releasing the Camera preview in your activity. } public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) { // If your preview can change or rotate, take care of those events here. // Make sure to stop the preview before resizing or reformatting it. if (mHolder.getSurface() == null){ // preview surface does not exist return; } // stop preview before making changes try { mCamera.stopPreview(); } catch (Exception e){ // ignore: tried to stop a non-existent preview } // set preview size and make any resize, rotate or // reformatting changes here // start preview with new settings try { mCamera.setPreviewDisplay(mHolder); mCamera.startPreview(); } catch (Exception e){ Log.d(TAG, "Error starting camera preview: " + e.getMessage()); } } } Manifest: <uses-permission android:name="android.permission.CAMERA"/> <uses-feature android:name="android.hardware.camera"/> LOG CAT: 06-30 15:58:35.075: D/libEGL(1153): loaded /system/lib/egl/libEGL_emulation.so 06-30 15:58:35.147: D/(1153): HostConnection::get() New Host Connection established 0x2a156060, tid 1153 06-30 15:58:35.478: D/libEGL(1153): loaded /system/lib/egl/libGLESv1_CM_emulation.so 06-30 15:58:35.515: D/libEGL(1153): loaded /system/lib/egl/libGLESv2_emulation.so 06-30 15:58:36.334: W/EGL_emulation(1153): eglSurfaceAttrib not implemented 06-30 15:58:36.685: D/OpenGLRenderer(1153): Enabling debug mode 0 06-30 15:58:36.935: D/MyActivity(1153): Error starting camera preview: startPreview failed 06-30 15:58:36.965: I/Choreographer(1153): Skipped 125 frames! The application may be doing too much work on its main thread. 06-30 15:58:38.455: W/Camera(1153): Camera server died! 06-30 15:58:38.455: W/Camera(1153): ICamera died 06-30 15:58:38.476: E/Camera(1153): Error 100 So If anyone could tell me what I am doing wrong (and explain why it should be done different) that would be great :) Thanks!

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• Why Does .Hide()ing and .Show()ing Panels in wxPython Result in the Sizer Changing the Layout?

  - by MetaHyperBolic

  As referenced in my previous question, I am trying to make something slightly wizard-like in function. I have settled on a single frame with a sizer added to it. I build panels for each of the screens I would like users to see, add them to the frame's sizer, then switch between panels by .Hide()ing one panel, then calling a custom .ShowYourself() on the next panel. Obviously, I would like the buttons to remain in the same place as the user progresses through the process. I have linked together two panels in an infinite loop by their "Back" and "Next" buttons so you can see what is going on. The first panel looks great; tom10's code worked on that level, as it eschewed my initial, over-fancy attempt with borders flying every which way. And then the second panel seems to have shrunk down to the bare minimum. As we return to the first panel, the shrinkage has occurred here as well. Why does it look fine on the first panel, but not after I return there? Why is calling .Fit() necessary if I do not want a 10 pixel by 10 pixel wad of grey? And if it is necessary, why does .Fit() give inconsistent results? This infinite loop seems to characterize my experience with this: I fix the layout on a panel, only to find that switching ruins the layout for other panels. I fix that problem, by using sizer_h.Add(self.panel1, 0) instead of sizer_h.Add(self.panel1, 1, wx.EXPAND), and now my layouts are off again. So far, my "solution" is to add a mastersizer.SetMinSize((475, 592)) to each panel's master sizer (commented out in the code below). This is a cruddy solution because 1) I have had to find the numbers that work by trial and error (-5 pixels for the width, -28 pixels for the height). 2) I don't understand why the underlying issue still happens. What's the correct, non-ugly solution? Instead of adding all of the panels to the frame's sizer at once, should switching panels involve .Detach()ing that panel from the frame's sizer and then .Add()ing the next panel to the frame's sizer? Is there a .JustMakeThisFillThePanel() method hiding somewhere I have missed in both the wxWidgets and the wxPython documents online? I'm obviously missing something in my mental model of layout. Here's a TinyURL link, if I can't manage to embed the . Minimalist code pasted below. import wx import sys class My_App(wx.App): def OnInit(self): self.frame = My_Frame(None) self.frame.Show() self.SetTopWindow(self.frame) return True def OnExit(self): print 'Dying ...' class My_Frame(wx.Frame): def __init__(self, image, parent=None,id=-1, title='Generic Title', pos=wx.DefaultPosition, style=wx.CAPTION | wx.STAY_ON_TOP): size = (480, 620) wx.Frame.__init__(self, parent, id, 'Program Title', pos, size, style) sizer_h = wx.BoxSizer(wx.HORIZONTAL) self.panel0 = User_Interaction0(self) sizer_h.Add(self.panel0, 1, wx.EXPAND) self.panel1 = User_Interaction1(self) sizer_h.Add(self.panel1, 1, wx.EXPAND) self.SetSizer(sizer_h) self.panel0.ShowYourself() def ShutDown(self): self.Destroy() class User_Interaction0(wx.Panel): def __init__(self, parent, id=-1): wx.Panel.__init__(self, parent, id) # master sizer for the whole panel mastersizer = wx.BoxSizer(wx.VERTICAL) #mastersizer.SetMinSize((475, 592)) mastersizer.AddSpacer(15) # build the top row txtHeader = wx.StaticText(self, -1, 'Welcome to This Boring\nProgram', (0, 0)) font = wx.Font(16, wx.DEFAULT, wx.NORMAL, wx.BOLD) txtHeader.SetFont(font) txtOutOf = wx.StaticText(self, -1, '1 out of 7', (0, 0)) rowtopsizer = wx.BoxSizer(wx.HORIZONTAL) rowtopsizer.Add(txtHeader, 3, wx.ALIGN_LEFT) rowtopsizer.Add((0,0), 1) rowtopsizer.Add(txtOutOf, 0, wx.ALIGN_RIGHT) mastersizer.Add(rowtopsizer, 0, flag=wx.EXPAND | wx.LEFT | wx.RIGHT, border=15) # build the middle row text = 'PANEL 0\n\n' text = text + 'This could be a giant blob of explanatory text.\n' txtBasic = wx.StaticText(self, -1, text) font = wx.Font(11, wx.DEFAULT, wx.NORMAL, wx.NORMAL) txtBasic.SetFont(font) mastersizer.Add(txtBasic, 1, flag=wx.EXPAND | wx.LEFT | wx.RIGHT, border=15) # build the bottom row btnBack = wx.Button(self, -1, 'Back') self.Bind(wx.EVT_BUTTON, self.OnBack, id=btnBack.GetId()) btnNext = wx.Button(self, -1, 'Next') self.Bind(wx.EVT_BUTTON, self.OnNext, id=btnNext.GetId()) btnCancelExit = wx.Button(self, -1, 'Cancel and Exit') self.Bind(wx.EVT_BUTTON, self.OnCancelAndExit, id=btnCancelExit.GetId()) rowbottomsizer = wx.BoxSizer(wx.HORIZONTAL) rowbottomsizer.Add(btnBack, 0, wx.ALIGN_LEFT) rowbottomsizer.AddSpacer(5) rowbottomsizer.Add(btnNext, 0) rowbottomsizer.AddSpacer(5) rowbottomsizer.AddStretchSpacer(1) rowbottomsizer.Add(btnCancelExit, 0, wx.ALIGN_RIGHT) mastersizer.Add(rowbottomsizer, flag=wx.EXPAND | wx.LEFT | wx.RIGHT, border=15) # finish master sizer mastersizer.AddSpacer(15) self.SetSizer(mastersizer) self.Raise() self.SetPosition((0,0)) self.Fit() self.Hide() def ShowYourself(self): self.Raise() self.SetPosition((0,0)) self.Fit() self.Show() def OnBack(self, event): self.Hide() self.GetParent().panel1.ShowYourself() def OnNext(self, event): self.Hide() self.GetParent().panel1.ShowYourself() def OnCancelAndExit(self, event): self.GetParent().ShutDown() class User_Interaction1(wx.Panel): def __init__(self, parent, id=-1): wx.Panel.__init__(self, parent, id) # master sizer for the whole panel mastersizer = wx.BoxSizer(wx.VERTICAL) #mastersizer.SetMinSize((475, 592)) mastersizer.AddSpacer(15) # build the top row txtHeader = wx.StaticText(self, -1, 'Read about This Boring\nProgram', (0, 0)) font = wx.Font(16, wx.DEFAULT, wx.NORMAL, wx.BOLD) txtHeader.SetFont(font) txtOutOf = wx.StaticText(self, -1, '2 out of 7', (0, 0)) rowtopsizer = wx.BoxSizer(wx.HORIZONTAL) rowtopsizer.Add(txtHeader, 3, wx.ALIGN_LEFT) rowtopsizer.Add((0,0), 1) rowtopsizer.Add(txtOutOf, 0, wx.ALIGN_RIGHT) mastersizer.Add(rowtopsizer, 0, flag=wx.EXPAND | wx.LEFT | wx.RIGHT, border=15) # build the middle row text = 'PANEL 1\n\n' text = text + 'This could be a giant blob of boring text.\n' txtBasic = wx.StaticText(self, -1, text) font = wx.Font(11, wx.DEFAULT, wx.NORMAL, wx.NORMAL) txtBasic.SetFont(font) mastersizer.Add(txtBasic, 1, flag=wx.EXPAND | wx.LEFT | wx.RIGHT, border=15) # build the bottom row btnBack = wx.Button(self, -1, 'Back') self.Bind(wx.EVT_BUTTON, self.OnBack, id=btnBack.GetId()) btnNext = wx.Button(self, -1, 'Next') self.Bind(wx.EVT_BUTTON, self.OnNext, id=btnNext.GetId()) btnCancelExit = wx.Button(self, -1, 'Cancel and Exit') self.Bind(wx.EVT_BUTTON, self.OnCancelAndExit, id=btnCancelExit.GetId()) rowbottomsizer = wx.BoxSizer(wx.HORIZONTAL) rowbottomsizer.Add(btnBack, 0, wx.ALIGN_LEFT) rowbottomsizer.AddSpacer(5) rowbottomsizer.Add(btnNext, 0) rowbottomsizer.AddSpacer(5) rowbottomsizer.AddStretchSpacer(1) rowbottomsizer.Add(btnCancelExit, 0, wx.ALIGN_RIGHT) mastersizer.Add(rowbottomsizer, flag=wx.EXPAND | wx.LEFT | wx.RIGHT, border=15) # finish master sizer mastersizer.AddSpacer(15) self.SetSizer(mastersizer) self.Raise() self.SetPosition((0,0)) self.Fit() self.Hide() def ShowYourself(self): self.Raise() self.SetPosition((0,0)) self.Fit() self.Show() def OnBack(self, event): self.Hide() self.GetParent().panel0.ShowYourself() def OnNext(self, event): self.Hide() self.GetParent().panel0.ShowYourself() def OnCancelAndExit(self, event): self.GetParent().ShutDown() def main(): app = My_App(redirect = False) app.MainLoop() if __name__ == '__main__': main()

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• Ethernet Communication Error

  - by SivaKumar

  Hi, I wrote a program to query the status of the Ethernet printer for that i created a TCP Stream Socket and i send the query command to the printer.In case of Error less condition it returns No error status but in error case its getting hang at recv command.Even i used Non blocking now the recv command returns nothing and error set as Resource temporarily unavailable. code: #include <stdio.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <netdb.h> #include <string.h> #include <unistd.h> #include <arpa/inet.h> #include <errno.h> #include <stdlib.h> #include <fcntl.h> #include <sys/ioctl.h> #include <sys/socket.h> #include <signal.h> #include <termios.h> #include <poll.h> #include <netinet/tcp.h> #include <stdarg.h> int main() { int ConnectSocket,ConnectSocket1,select_err,err,nRet,nBytesRead; struct timeval waitTime = {10,30}; fd_set socket_set; unsigned char * dataBuf = NULL; unsigned char tempVar, tempVar1, tempVar2, tempVar3; char reset[] = "\033E 2\r"; char print[] = "\033A 1\r"; char buf[1024]={0}; ConnectSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); printf("The Socket ID is %d\n",ConnectSocket); if (ConnectSocket < 0) { perror("socket()"); return 0; } struct sockaddr_in clientService; clientService.sin_family = AF_INET; clientService.sin_addr.s_addr = inet_addr("192.168.0.129"); //Printer IP clientService.sin_port = htons( 9100); // Printer Port if ( connect( ConnectSocket, (struct sockaddr*) &clientService, sizeof(clientService) ) == -1) { perror("connect()"); close(ConnectSocket); return -1; } /* if((nRet = ioctl(ConnectSocket , FIONREAD, &nBytesRead) == -1)) { perror("ioctl()"); } perror("ioctl()"); */ FD_ZERO(&socket_set); FD_SET(ConnectSocket, &socket_set); do { errno=0; select_err = select(ConnectSocket+1, NULL, &socket_set, NULL, &waitTime); }while(errno==EINPROGRESS); if (-1 == select_err || 0 == select_err) { int optVal = 0; int optLen = sizeof(optVal); if(select_err == -1) { perror("select() write-side"); } else { //Timeout errno=0; err = getsockopt(ConnectSocket, SOL_SOCKET, SO_ERROR, (char*)&optVal, &optLen); printf("the return of the getsockopt is %d\n",err); printf("the opt val is %s\n",(char*)optVal); perror("getsockopt()"); if(err == -1) { perror("getsockopt() write-side"); } } printf("Select Failed during write - ConnectSocket: %d\n", ConnectSocket); //close(ConnectSocket); return -1; } err = send(ConnectSocket,print,sizeof(print)-1, 0); printf("\n No of Bytes Send is %d\n",err); if(err == -1 || err ==0) { perror("send()"); //close(ConnectSocket); return -1; } FD_ZERO(&socket_set); FD_SET(ConnectSocket, &socket_set); do { errno=0; select_err = select(ConnectSocket+1, NULL, &socket_set, NULL, &waitTime); }while(errno==EINPROGRESS); if (-1 == select_err || 0 == select_err) { printf("Select Failed during write - ConnectSocket: %d\n", ConnectSocket); return -1; } err = send(ConnectSocket,reset,sizeof(reset)-1, 0); printf("\n No of Bytes Send is %d\n",err); if(err == -1 || err ==0) { perror("send()"); //close(ConnectSocket); return -1; } FD_ZERO(&socket_set); FD_SET(ConnectSocket, &socket_set); printf("i am in reading \n"); select_err = select(ConnectSocket+1, &socket_set, NULL, NULL, &waitTime); printf("the retun of the read side select is %d \n",select_err); perror("select()"); if (-1 == select_err|| 0 == select_err) { printf("Read timeout; ConnectSocket: %d\n", ConnectSocket); close(ConnectSocket); perror("close()"); return -1; } printf("Before Recv\n"); nBytesRead = recv(ConnectSocket , buf, 1024, 0); printf("No of Bytes read is %d\n",nBytesRead); printf("%s\n",buf); if(nBytesRead == -1) { perror("recv()"); close(ConnectSocket); perror("clode()"); return -1; } close(ConnectSocket); return 1; }

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• Why doesn't my implementation of El Gamal work for long text strings?

  - by angstrom91

  I'm playing with the El Gamal cryptosystem, and my goal is to be able to encipher and decipher long sequences of text. I have come up with a method that works for short sequences, but does not work for long sequences, and I cannot figure out why. El Gamal requires the plaintext to be an integer. I have turned my string into a byte[] using the .getBytes() method for Strings, and then created a BigInteger out of the byte[]. After encryption/decryption, I turn the BigInteger into a byte[] using the .toByteArray() method for BigIntegers, and then create a new String object from the byte[]. This works perfectly when i call ElGamalEncipher with strings up to 129 characters. With 130 or more characters, the output produced is garbled. Can someone suggest how to solve this issue? Is this an issue with my method of turning the string into a BigInteger? If so, is there a better way to turn my string of text into a BigInteger and back? Below is my encipher/decipher code with a program to demonstrate the problem. import java.math.BigInteger; public class Main { static BigInteger P = new BigInteger("15893293927989454301918026303382412" + "2586402937727056707057089173871237566896685250125642378268385842" + "6917261652781627945428519810052550093673226849059197769795219973" + "9423619267147615314847625134014485225178547696778149706043781174" + "2873134844164791938367765407368476144402513720666965545242487520" + "288928241768306844169"); static BigInteger G = new BigInteger("33234037774370419907086775226926852" + "1714093595439329931523707339920987838600777935381196897157489391" + "8360683761941170467795379762509619438720072694104701372808513985" + "2267495266642743136795903226571831274837537691982486936010899433" + "1742996138863988537349011363534657200181054004755211807985189183" + "22832092343085067869"); static BigInteger R = new BigInteger("72294619754760174015019300613282868" + "7219874058383991405961870844510501809885568825032608592198728334" + "7842806755320938980653857292210955880919036195738252708294945320" + "3969657021169134916999794791553544054426668823852291733234236693" + "4178738081619274342922698767296233937873073756955509269717272907" + "8566607940937442517"); static BigInteger A = new BigInteger("32189274574111378750865973746687106" + "3695160924347574569923113893643975328118502246784387874381928804" + "6865920942258286938666201264395694101012858796521485171319748255" + "4630425677084511454641229993833255506759834486100188932905136959" + "7287419551379203001848457730376230681693887924162381650252270090" + "28296990388507680954"); public static void main(String[] args) { FewChars(); System.out.println(); ManyChars(); } public static void FewChars() { //ElGamalEncipher(String plaintext, BigInteger p, BigInteger g, BigInteger r) BigInteger[] cipherText = ElGamal.ElGamalEncipher("This is a string " + "of 129 characters which works just fine . This is a string " + "of 129 characters which works just fine . This is a s", P, G, R); System.out.println("This is a string of 129 characters which works " + "just fine . This is a string of 129 characters which works " + "just fine . This is a s"); //ElGamalDecipher(BigInteger c, BigInteger d, BigInteger a, BigInteger p) String output = ElGamal.ElGamalDecipher(cipherText[0], cipherText[1], A, P); System.out.println("The decrypted text is: " + output); } public static void ManyChars() { //ElGamalEncipher(String plaintext, BigInteger p, BigInteger g, BigInteger r) BigInteger[] cipherText = ElGamal.ElGamalEncipher("This is a string " + "of 130 characters which doesn’t work! This is a string of " + "130 characters which doesn’t work! This is a string of ", P, G, R); System.out.println("This is a string of 130 characters which doesn’t " + "work! This is a string of 130 characters which doesn’t work!" + " This is a string of "); //ElGamalDecipher(BigInteger c, BigInteger d, BigInteger a, BigInteger p) String output = ElGamal.ElGamalDecipher(cipherText[0], cipherText[1], A, P); System.out.println("The decrypted text is: " + output); } } import java.math.BigInteger; import java.security.SecureRandom; public class ElGamal { public static BigInteger[] ElGamalEncipher(String plaintext, BigInteger p, BigInteger g, BigInteger r) { // returns a BigInteger[] cipherText // cipherText[0] is c // cipherText[1] is d SecureRandom sr = new SecureRandom(); BigInteger[] cipherText = new BigInteger[2]; BigInteger pText = new BigInteger(plaintext.getBytes()); // 1: select a random integer k such that 1 <= k <= p-2 BigInteger k = new BigInteger(p.bitLength() - 2, sr); // 2: Compute c = g^k(mod p) BigInteger c = g.modPow(k, p); // 3: Compute d= P*r^k = P(g^a)^k(mod p) BigInteger d = pText.multiply(r.modPow(k, p)).mod(p); // C =(c,d) is the ciphertext cipherText[0] = c; cipherText[1] = d; return cipherText; } public static String ElGamalDecipher(BigInteger c, BigInteger d, BigInteger a, BigInteger p) { //returns the plaintext enciphered as (c,d) // 1: use the private key a to compute the least non-negative residue // of an inverse of (c^a)' (mod p) BigInteger z = c.modPow(a, p).modInverse(p); BigInteger P = z.multiply(d).mod(p); byte[] plainTextArray = P.toByteArray(); return new String(plainTextArray); } }

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• Resulting .exe from PyInstaller with wxPython crashing

  - by Helgi Hrafn Gunnarsson

  I'm trying to compile a very simple wxPython script into an executable by using PyInstaller on Windows Vista. The Python script is nothing but a Hello World in wxPython. I'm trying to get that up and running as a Windows executable before I add any of the features that the program needs to have. But I'm already stuck. I've jumped through some loops in regards to MSVCR90.DLL, MSVCP90.DLL and MSVCPM90.DLL, which I ended up copying from my Visual Studio installation (C:\Program Files\Microsoft Visual Studio 9.0\VC\redist\x86\Microsoft.VC90.CRT). As according to the instructions for PyInstaller, I run: Command: Configure.py Output: I: computing EXE_dependencies I: Finding TCL/TK... I: could not find TCL/TK I: testing for Zlib... I: ... Zlib available I: Testing for ability to set icons, version resources... I: ... resource update available I: Testing for Unicode support... I: ... Unicode available I: testing for UPX... I: ...UPX available I: computing PYZ dependencies... So far, so good. I continue. Command: Makespec.py -F guitest.py Output: wrote C:\Code\PromoUSB\guitest.spec now run Build.py to build the executable Then there's the final command. Command: Build.py guitest.spec Output: checking Analysis building Analysis because out0.toc non existent running Analysis out0.toc Analyzing: C:\Python26\pyinstaller-1.3\support\_mountzlib.py Analyzing: C:\Python26\pyinstaller-1.3\support\useUnicode.py Analyzing: guitest.py Warnings written to C:\Code\PromoUSB\warnguitest.txt checking PYZ rebuilding out1.toc because out1.pyz is missing building PYZ out1.toc checking PKG rebuilding out3.toc because out3.pkg is missing building PKG out3.pkg checking ELFEXE rebuilding out2.toc because guitest.exe missing building ELFEXE out2.toc I get the resulting 'guitest.exe' file, but upon execution, it "simply crashes"... and there is no debug info. It's just one of those standard Windows Vista crashes. The script itself, guitest.py runs just fine by itself. It only crashes as an executable, and I'm completely lost. I don't even know what to look for, since nothing I've tried has returned any relevant results. Another file is generated as a result of the compilation process, called 'warnguitest.txt'. Here are its contents. W: no module named posix (conditional import by os) W: no module named optik.__all__ (top-level import by optparse) W: no module named readline (delayed, conditional import by cmd) W: no module named readline (delayed import by pdb) W: no module named pwd (delayed, conditional import by posixpath) W: no module named org (top-level import by pickle) W: no module named posix (delayed, conditional import by iu) W: no module named fcntl (conditional import by subprocess) W: no module named org (top-level import by copy) W: no module named _emx_link (conditional import by os) W: no module named optik.__version__ (top-level import by optparse) W: no module named fcntl (top-level import by tempfile) W: __all__ is built strangely at line 0 - collections (C:\Python26\lib\collections.pyc) W: delayed exec statement detected at line 0 - collections (C:\Python26\lib\collections.pyc) W: delayed conditional __import__ hack detected at line 0 - doctest (C:\Python26\lib\doctest.pyc) W: delayed exec statement detected at line 0 - doctest (C:\Python26\lib\doctest.pyc) W: delayed conditional __import__ hack detected at line 0 - doctest (C:\Python26\lib\doctest.pyc) W: delayed __import__ hack detected at line 0 - encodings (C:\Python26\lib\encodings\__init__.pyc) W: __all__ is built strangely at line 0 - optparse (C:\Python26\pyinstaller-1.3\optparse.pyc) W: __all__ is built strangely at line 0 - dis (C:\Python26\lib\dis.pyc) W: delayed eval hack detected at line 0 - os (C:\Python26\lib\os.pyc) W: __all__ is built strangely at line 0 - __future__ (C:\Python26\lib\__future__.pyc) W: delayed conditional __import__ hack detected at line 0 - unittest (C:\Python26\lib\unittest.pyc) W: delayed conditional __import__ hack detected at line 0 - unittest (C:\Python26\lib\unittest.pyc) W: __all__ is built strangely at line 0 - tokenize (C:\Python26\lib\tokenize.pyc) W: __all__ is built strangely at line 0 - wx (C:\Python26\lib\site-packages\wx-2.8-msw-unicode\wx\__init__.pyc) W: __all__ is built strangely at line 0 - wx (C:\Python26\lib\site-packages\wx-2.8-msw-unicode\wx\__init__.pyc) W: delayed exec statement detected at line 0 - bdb (C:\Python26\lib\bdb.pyc) W: delayed eval hack detected at line 0 - bdb (C:\Python26\lib\bdb.pyc) W: delayed eval hack detected at line 0 - bdb (C:\Python26\lib\bdb.pyc) W: delayed __import__ hack detected at line 0 - pickle (C:\Python26\lib\pickle.pyc) W: delayed __import__ hack detected at line 0 - pickle (C:\Python26\lib\pickle.pyc) W: delayed conditional exec statement detected at line 0 - iu (C:\Python26\pyinstaller-1.3\iu.pyc) W: delayed conditional exec statement detected at line 0 - iu (C:\Python26\pyinstaller-1.3\iu.pyc) W: delayed eval hack detected at line 0 - gettext (C:\Python26\lib\gettext.pyc) W: delayed __import__ hack detected at line 0 - optik.option_parser (C:\Python26\pyinstaller-1.3\optik\option_parser.pyc) W: delayed conditional eval hack detected at line 0 - warnings (C:\Python26\lib\warnings.pyc) W: delayed conditional __import__ hack detected at line 0 - warnings (C:\Python26\lib\warnings.pyc) W: __all__ is built strangely at line 0 - optik (C:\Python26\pyinstaller-1.3\optik\__init__.pyc) W: delayed exec statement detected at line 0 - pdb (C:\Python26\lib\pdb.pyc) W: delayed conditional eval hack detected at line 0 - pdb (C:\Python26\lib\pdb.pyc) W: delayed eval hack detected at line 0 - pdb (C:\Python26\lib\pdb.pyc) W: delayed conditional eval hack detected at line 0 - pdb (C:\Python26\lib\pdb.pyc) W: delayed eval hack detected at line 0 - pdb (C:\Python26\lib\pdb.pyc) I don't know what the heck to make of any of that. Again, my searches have been fruitless.

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• CURL Authentication being lost?

  - by John Sloan

  I am authenticating a login via CURL just fine. I have a variable I am using to display the returned HTML, and it is returning my user control panel as if I am logged in. After authenticating, I want to communicate variables with a form on another page within the site; but for some reason the HTML from that page is returning a non-authenticated version of the header (as if the original authentication never took place.) I have a cookies.txt file with 777 permissions, and have tried just getting the contents of the same page shown when I authenticate and it is as if I am losing any associated session/cookie data somewhere along the way. Here is my curl.class file - <? class Curl { public $cookieJar = ""; // Make sure the cookies.txt file is read/write permissions public function __construct($cookieJarFile = 'cookies.txt') { $this->cookieJar = $cookieJarFile; } function setup() { $header = array(); $header[0] = "Accept: text/xml,application/xml,application/xhtml+xml,"; $header[0] .= "text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5"; $header[] = "Cache-Control: max-age=0"; $header[] = "Connection: keep-alive"; $header[] = "Keep-Alive: 300"; $header[] = "Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7"; $header[] = "Accept-Language: en-us,en;q=0.5"; $header[] = "Pragma: "; // browsers keep this blank. curl_setopt($this->curl, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows; U; Windows NT 5.2; en-US; rv:1.8.1.7) Gecko/20070914 Firefox/2.0.0.7'); curl_setopt($this->curl, CURLOPT_HTTPHEADER, $header); curl_setopt($this->curl, CURLOPT_COOKIEJAR, $this->cookieJar); curl_setopt($this->curl, CURLOPT_COOKIEFILE, $this->cookieJar); curl_setopt($this->curl, CURLOPT_AUTOREFERER, true); curl_setopt($this->curl, CURLOPT_COOKIESESSION, true); curl_setopt($this->curl, CURLOPT_FOLLOWLOCATION, true); curl_setopt($this->curl, CURLOPT_RETURNTRANSFER, true); } function get($url) { $this->curl = curl_init($url); $this->setup(); return $this->request(); } function getAll($reg, $str) { preg_match_all($reg, $str, $matches); return $matches[1]; } function postForm($url, $fields, $referer = '') { $this->curl = curl_init($url); $this->setup(); curl_setopt($this->curl, CURLOPT_URL, $url); curl_setopt($this->curl, CURLOPT_POST, 1); curl_setopt($this->curl, CURLOPT_REFERER, $referer); curl_setopt($this->curl, CURLOPT_POSTFIELDS, $fields); return $this->request(); } function getInfo($info) { $info = ($info == 'lasturl') ? curl_getinfo($this->curl, CURLINFO_EFFECTIVE_URL) : curl_getinfo($this->curl, $info); return $info; } function request() { return curl_exec($this->curl); } } ?> And here is my curl.php file - <? include('curl.class.php'); // This path would change to where you store the file $curl = new Curl(); $url = "http://www.site.com/public/member/signin"; $fields = "MAX_FILE_SIZE=50000000&dado_form_3=1&member[email]=email&member[password]=pass&x=16&y=5&member[persistent]=true"; // Calling URL $referer = "http://www.site.com/public/member/signin"; $html = $curl->postForm($url, $fields, $referer); echo($html); ?> <hr style="clear:both;"/> <? $html = $curl->postForm('http://www.site.com/index.php','nid=443&sid=733005&tab=post&eval=yes&ad=&MAX_FILE_SIZE=10000000&ip=63.225.235.30','http://www.site.com/public/member/signin'); echo $html; // This will show you the HTML of the current page you and logged into ?> Any ideas?

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• Trouble on setting SSL certificates for Virtual Hosts using Apache\Phusion Passenger in localhost

  - by user502052

  I am using Ruby on Rails 3 and I would like to make to work HTTPS connections on localhost. I am using: Apache v2 + Phusion Passenger Mac OS + Snow Leopard v10.6.6 My Ruby on Rails installation use the Typhoeus gem (it is possible to use the Ruby net\http library but the result doesn't change) to make HTTP requests over HTTPS. I created self-signed ca.key, pjtname.crt and pjtname.key as detailed on the Apple website. Notice: Following instruction from the Apple website, on running the openssl req -new -key server.key -out server.csr command (see the link) at this point Common Name (eg, YOUR name) []: (this is the important one) I entered *pjtname.com so that is valid for all sub_domain of that site. In my Apache httpd.conf I have two virtual hosts configured in this way: # Secure (SSL/TLS) connections #Include /private/etc/apache2/extra/httpd-ssl.conf # # Note: The following must must be present to support # starting without SSL on platforms with no /dev/random equivalent # but a statically compiled-in mod_ssl. # <IfModule ssl_module> SSLRandomSeed startup builtin SSLRandomSeed connect builtin </IfModule> Include /private/etc/apache2/other/*.conf # Passenger configuration LoadModule passenger_module /Users/<my_user_name>/.rvm/gems/ruby-1.9.2-p136/gems/passenger-3.0.2/ext/apache2/mod_passenger.so PassengerRoot /Users/<my_user_name>/.rvm/gems/ruby-1.9.2-p136/gems/passenger-3.0.2 PassengerRuby /Users/<my_user_name>/.rvm/wrappers/ruby-1.9.2-p136/ruby # Go ahead and accept connections for these vhosts # from non-SNI clients SSLStrictSNIVHostCheck off # Ensure that Apache listens on port 443 Listen 443 # Listen for virtual host requests on all IP addresses NameVirtualHost *:80 NameVirtualHost *:443 # # PJTNAME.COM and subdomains SETTING # <VirtualHost *:443> # Because this virtual host is defined first, it will # be used as the default if the hostname is not received # in the SSL handshake, e.g. if the browser doesn't support # SNI. ServerName pjtname.com:443 DocumentRoot "/Users/<my_user_name>/Sites/pjtname.com/pjtname.com/public" ServerAdmin [email protected] ErrorLog "/private/var/log/apache2/error_log" TransferLog "/private/var/log/apache2/access_log" RackEnv development <Directory "/Users/<my_user_name>/Sites/pjtname.com/pjtname.com/public"> Order allow,deny Allow from all </Directory> # SSL Configuration SSLEngine on # Self Signed certificates # Server Certificate SSLCertificateFile /private/etc/apache2/ssl/wildcard.certificate/pjtname.crt # Server Private Key SSLCertificateKeyFile /private/etc/apache2/ssl/wildcard.certificate/pjtname.key # Server Intermediate Bundle SSLCertificateChainFile /private/etc/apache2/ssl/wildcard.certificate/ca.crt </VirtualHost> # HTTP Setting <VirtualHost *:80> ServerName pjtname.com DocumentRoot "/Users/<my_user_name>/Sites/pjtname.com/pjtname.com/public" RackEnv development <Directory "/Users/<my_user_name>/Sites/pjtname.com/pjtname.com/public"> Order allow,deny Allow from all </Directory> </VirtualHost> <VirtualHost *:443> ServerName users.pjtname.com:443 DocumentRoot "/Users/<my_user_name>/Sites/pjtname.com/users.pjtname.com/public" ServerAdmin [email protected] ErrorLog "/private/var/log/apache2/error_log" TransferLog "/private/var/log/apache2/access_log" RackEnv development <Directory "/Users/<my_user_name>/Sites/pjtname.com/users.pjtname.com/public"> Order allow,deny Allow from all </Directory> # SSL Configuration SSLEngine on # Self Signed certificates # Server Certificate SSLCertificateFile /private/etc/apache2/ssl/wildcard.certificate/pjtname.crt # Server Private Key SSLCertificateKeyFile /private/etc/apache2/ssl/wildcard.certificate/pjtname.key # Server Intermediate Bundle SSLCertificateChainFile /private/etc/apache2/ssl/wildcard.certificate/ca.crt </VirtualHost> # HTTP Setting <VirtualHost *:80> ServerName users.pjtname.com DocumentRoot "/Users/<my_user_name>/Sites/pjtname.com/users.pjtname.com/public" RackEnv development <Directory "/Users/<my_user_name>/Sites/pjtname.com/users.pjtname.com/public"> Order allow,deny Allow from all </Directory> </VirtualHost> In the host file I have: ## # Host Database # # localhost is used to configure the loopback interface # when the system is booting. Do not change this entry. ## 127.0.0.1 localhost 255.255.255.255 broadcasthost ::1 localhost fe80::1%lo0 localhost # PJTNAME.COM SETTING 127.0.0.1 pjtname.com 127.0.0.1 users.pjtname.com All seems to work properly because I have already set everything (I think correctly): I generated a wildcard certificate for my domains and sub-domains (in this example: *.pjtname.com) I have set base-named virtualhosts in the http.conf file listening on port :433 and :80 My browser accept certificates also if it alerts me that those aren't safe (notice: I must accept certificates for each domain\sub-domain; that is, [only] at the first time I access a domain or sub-domain over HTTPS I must do the same procedure for acceptance) and I can have access to pages using HTTPS After all this work, when I make a request using Typhoeus (I can use also the Ruby Net::Http library and the result doesn't change) from the pjtname.com RoR application: # Typhoeus request Typhoeus::Request.get("https://users.pjtname.com/") I get something like a warning about the certificate: --- &id001 !ruby/object:Typhoeus::Response app_connect_time: 0.0 body: "" code: 0 connect_time: 0.000625 # Here is the warning curl_error_message: Peer certificate cannot be authenticated with known CA certificates curl_return_code: 60 effective_url: https://users.pjtname.com/ headers: "" http_version: mock: false name_lookup_time: 0.000513 pretransfer_time: 0.0 request: !ruby/object:Typhoeus::Request after_complete: auth_method: body: ... All this means that something is wrong. So, what I have to do to avoid the "Peer certificate cannot be authenticated with known CA certificates" warning and make the HTTPS request to work? Where is\are the error\errors (I think in the Apache configuration, but where?!)? P.S.: if you need some more info, let me know.

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• Flash video playing on top of everything else in IE7

  - by Brett

  Hi everyone, I've been spending hours now reading up on IE7's issue with rendering Flash content on top of other elements, particularly navigation menus (this is often a problem with dropdown menus and Flash ad banners, for example). I've tried a few of the suggested solutions but none have worked for me so far. I'll do my best to explain the circumstances, and would appreciate any advice in the matter! Update At Mercator's request, I am providing a large code-sample to assist in any advice you might have. Consider the HTML below: <body> <div id="page-wrap"> <div id="content-wrap"> <div id="main"> <h1>Page Title</h1> <p>Paragraph text before video.</p> <div class="video-container"> <script type="text/javascript"> AC_FL_RunContent('id','player','name','player','width','480','height','294','src','player','allowscriptaccess','always','allowfullscreen','true','flashvars','file=mp4/VIDEO_FILE.mp4','movie','player' ); //end AC code </script> <noscript> <object id="player" classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" name="player" width="480" height="294"> <param name="wmode" value="transparent" /> <param name="movie" value="player.swf" /> <param name="allowfullscreen" value="true" /> <param name="allowscriptaccess" value="always" /> <param name="flashvars" value="file=mp4/VIDEO_FILE.mp4" /> <embed wmode="transparent" type="application/x-shockwave-flash" id="player2" name="player2" src="player.swf" width="480" height="294" allowscriptaccess="always" allowfullscreen="true" flashvars="file=mp4/VIDEO_FILE.mp4" ></embed> </object> </noscript> </div> <p>Paragraph after video.</p> </div><!-- end main --> <div id="subContent"> <p>Sub-content.</p> </div><!-- end subContent --> <div id="content-clear"></div> </div><!-- end content-wrap --> </div><!-- end page-wrap --> <div id="footpanel"> <ul id="mainpanel"> <li id="panel-link"><a href="#"><span class="icon"></span>Panel Link</a> <div class="subpanel"> <h3><span> &ndash; </span>Panel Link</h3> <ul> <li><p>Revealed content</p></li> </ul> </div> </li> </ul> </div> <!-- END footpanel --> </body> Below are the non-presentational CSS selectors that apply to the divs above: body { /*no positioning styles applied */ } #page-wrap { width: 100%; } #content-wrap { width: 960px; margin 0 auto; } #main { float: left; width: 573px; } .video-container { position: relative; width: 480px; z-index: 1; } #sub { float: left; width: 347px; } #content-clear { clear: both; } #foot-panel { position: fixed; width: 94%; bottom: 0; left: 0; z-index: 3000; } ul#main-panel { float: left; } The footpanel uses jQuery-powered flyout menus, if that provides any further context. These menus have z-indexes in the 300X range to appear above the footpanel. The Flash in question is JW player playing a flash video or mp4. Currently, the object and embed tags are inside a container div. My understanding of previous solutions was that the combination of the param changes and the positioning/z-index change on the container div should have resolved the issue. Alas, it is not so. The player resides on top of the footpanel. Other information that may or may not be helpful is that the page is XHTML 1.0 Transitional and that Dreamweaver reports 1 error in the HTML code: <embed> is not in the XHTML 1.0 specification. This fact does not prevent the video from being viewed in any browser tested, and the page still displays correctly in FF. Thanks in advance!

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• Drupal: Create custom search

  - by Dr. Hfuhruhurr

  I'm trying to create a custom search but getting stuck. What I want is to have a dropdownbox so the user can choose where to search in. These options can mean 1 or more content types. So if he chooses options A, then the search will look in node-type P,Q,R. But he may not give those results, but only the uid's which will be then themed to gather specific data for that user. To make it a little bit clearer, Suppose I want to llok for people. The what I'm searching in is 2 content profile types. But ofcourse you dont want to display those as a result, but a nice picture of the user and some data. I started with creating a form with a textfield and the dropdown box. Then, in the submit handler, i created the keys and redirected to another pages with those keys as a tail. This page has been defined in the menu hook, just like how search does it. After that I want to call hook_view to do the actual search by calling node_search, and give back the results. Unfortunately, it goes wrong. When i click the Search button, it gives me a 404. But am I on the right track? Is this the way to create a custom search? Thx for your help. Here's the code for some clarity: <?php // $Id$ /* * @file * Searches on Project, Person, Portfolio or Group. */ /** * returns an array of menu items * @return array of menu items */ function vm_search_menu() { $subjects = _vm_search_get_subjects(); foreach ($subjects as $name => $description) { $items['zoek/'. $name .'/%menu_tail'] = array( 'page callback' => 'vm_search_view', 'page arguments' => array($name), 'type' => MENU_LOCAL_TASK, ); } return $items; } /** * create a block to put the form into. * @param $op * @param $delta * @param $edit * @return mixed */ function vm_search_block($op = 'list', $delta = 0, $edit = array()) { switch ($op) { case 'list': $blocks[0]['info'] = t('Algemene zoek'); return $blocks; case 'view': if (0 == $delta) { $block['subject'] = t(''); $block['content'] = drupal_get_form('vm_search_general_form'); } return $block; } } /** * Define the form. */ function vm_search_general_form() { $subjects = _vm_search_get_subjects(); foreach ($subjects as $key => $subject) { $options[$key] = $subject['desc']; } $form['subjects'] = array( '#type' => 'select', '#options' => $options, '#required' => TRUE, ); $form['keys'] = array( '#type' => 'textfield', '#required' => TRUE, ); $form['submit'] = array( '#type' => 'submit', '#value' => t('Zoek'), ); return $form; } function vm_search_general_form_submit($form, &$form_state) { $subjects = _vm_search_get_subjects(); $keys = $form_state['values']['keys']; //the search keys //the content types to search in $keys .= ' type:' . implode(',', $subjects[$form_state['values']['subjects']]['types']); //redirect to the page, where vm_search_view will handle the actual search $form_state['redirect'] = 'zoek/'. $form_state['values']['subjects'] .'/'. $keys; } /** * Menu callback; presents the search results. */ function vm_search_view($type = 'node') { // Search form submits with POST but redirects to GET. This way we can keep // the search query URL clean as a whistle: // search/type/keyword+keyword if (!isset($_POST['form_id'])) { if ($type == '') { // Note: search/node can not be a default tab because it would take on the // path of its parent (search). It would prevent remembering keywords when // switching tabs. This is why we drupal_goto to it from the parent instead. drupal_goto($front_page); } $keys = search_get_keys(); // Only perform search if there is non-whitespace search term: $results = ''; if (trim($keys)) { // Log the search keys: watchdog('vm_search', '%keys (@type).', array('%keys' => $keys, '@type' => $type)); // Collect the search results: $results = node_search('search', $type); if ($results) { $results = theme('box', t('Zoek resultaten'), $results); } else { $results = theme('box', t('Je zoek heeft geen resultaten opgeleverd.')); } } } return $results; } /** * returns array where to look for * @return array */ function _vm_search_get_subjects() { $subjects['opdracht'] = array('desc' => t('Opdracht'), 'types' => array('project') ); $subjects['persoon'] = array('desc' => t('Persoon'), 'types' => array('types_specialisatie', 'smaak_en_interesses') ); $subjects['groep'] = array('desc' => t('Groep'), 'types' => array('Villamedia_groep') ); $subjects['portfolio'] = array('desc' => t('Portfolio'), 'types' => array('artikel') ); return $subjects; }

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• JPA behaviour...

  - by Marcel

  Hi I have some trouble understanding a JPA behaviour. Mabye someone could give me a hint. Situation: Product entity: @Entity public class Product implements Serializable { ... @OneToMany(mappedBy="product", fetch=FetchType.EAGER) private List<ProductResource> productResources = new ArrayList<ProductResource>(); .... public List<ProductResource> getProductResources() { return productResources; } public boolean equals(Object obj) { if (obj == this) return true; if (obj == null) return false; if (!(obj instanceof Product)) return false; Product p = (Product) obj; return p.productId == productId; } } Resource entity: @Entity public class Resource implements Serializable { ... @OneToMany(mappedBy="resource", fetch=FetchType.EAGER) private List<ProductResource> productResources = new ArrayList<ProductResource>(); ... public void setProductResource(List<ProductResource> productResource) { this.productResources = productResource; } public List<ProductResource> getProductResources() { return productResources; } public boolean equals(Object obj) { if (obj == this) return true; if (obj == null) return false; if (!(obj instanceof Resource)) return false; Resource r = (Resource) obj; return (long)resourceId==(long)r.resourceId; } } ProductResource Entity: This is a JoinTable (association class) with additional properties (amount). It maps Product and Resources. @Entity public class ProductResource implements Serializable { ... @JoinColumn(nullable=false, updatable=false) @ManyToOne(fetch=FetchType.EAGER, cascade=CascadeType.PERSIST) private Product product; @JoinColumn(nullable=false, updatable=false) @ManyToOne(fetch=FetchType.EAGER, cascade=CascadeType.PERSIST) private Resource resource; private int amount; public void setProduct(Product product) { this.product = product; if(!product.getProductResources().contains((this))){ product.getProductResources().add(this); } } public Product getProduct() { return product; } public void setResource(Resource resource) { this.resource = resource; if(!resource.getProductResources().contains((this))){ resource.getProductResources().add(this); } } public Resource getResource() { return resource; } ... public boolean equals(Object obj) { if (obj == this) return true; if (obj == null) return false; if (!(obj instanceof ProductResource)) return false; ProductResource pr = (ProductResource) obj; return (long)pr.productResourceId == (long)productResourceId; } } This is the Session Bean (running on glassfish). @Stateless(mappedName="PersistenceManager") public class PersistenceManagerBean implements PersistenceManager { @PersistenceContext(unitName = "local_mysql") private EntityManager em; public Object create(Object entity) { em.persist(entity); return entity; } public void delete(Object entity) { em.remove(em.merge(entity)); } public Object retrieve(Class entityClass, Long id) { Object entity = em.find(entityClass, id); return entity; } public void update(Object entity) { em.merge(entity); } } I call the session Bean from a java client: public class Start { public static void main(String[] args) throws NamingException { PersistenceManager pm = (PersistenceManager) new InitialContext().lookup("java:global/BackITServer/PersistenceManagerBean"); ProductResource pr = new ProductResource(); Product p = new Product(); Resource r = new Resource(); pr.setProduct(p); pr.setResource(r); ProductResource pr_stored = (ProductResource) pm.create(pr); pm.delete(pr_stored); Product p_ret = (Product) pm.retrieve(Product.class, pr_stored.getProduct().getProductId()); // prints out true ???????????????????????????????????? System.out.println(p_ret.getProductResources().contains(pr_stored)); } } So here comes my problem. Why is the ProductResource entity still in the List productResources(see code above). The productResource tuple in the db is gone after the deletion and I do newly retrieve the Product entity. If I understood right every method call of the client happens in a new persistence context, but here i obviously get back the non-refreshed product object!? Any help is appreciated Thanks Marcel

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• Using WeakReference to resolve issue with .NET unregistered event handlers causing memory leaks.

  - by Eric

  The problem: Registered event handlers create a reference from the event to the event handler's instance. If that instance fails to unregister the event handler (via Dispose, presumably), then the instance memory will not be freed by the garbage collector. Example: class Foo { public event Action AnEvent; public void DoEvent() { if (AnEvent != null) AnEvent(); } } class Bar { public Bar(Foo l) { l.AnEvent += l_AnEvent; } void l_AnEvent() { } } If I instantiate a Foo, and pass this to a new Bar constructor, then let go of the Bar object, it will not be freed by the garbage collector because of the AnEvent registration. I consider this a memory leak, and seems just like my old C++ days. I can, of course, make Bar IDisposable, unregister the event in the Dispose() method, and make sure to call Dispose() on instances of it, but why should I have to do this? I first question why events are implemented with strong references? Why not use weak references? An event is used to abstractly notify an object of changes in another object. It seems to me that if the event handler's instance is no longer in use (i.e., there are no non-event references to the object), then any events that it is registered with should automatically be unregistered. What am I missing? I have looked at WeakEventManager. Wow, what a pain. Not only is it very difficult to use, but its documentation is inadequate (see http://msdn.microsoft.com/en-us/library/system.windows.weakeventmanager.aspx -- noticing the "Notes to Inheritors" section that has 6 vaguely described bullets). I have seen other discussions in various places, but nothing I felt I could use. I propose a simpler solution based on WeakReference, as described here. My question is: Does this not meet the requirements with significantly less complexity? To use the solution, the above code is modified as follows: class Foo { public WeakReferenceEvent AnEvent = new WeakReferenceEvent(); internal void DoEvent() { AnEvent.Invoke(); } } class Bar { public Bar(Foo l) { l.AnEvent += l_AnEvent; } void l_AnEvent() { } } Notice two things: 1. The Foo class is modified in two ways: The event is replaced with an instance of WeakReferenceEvent, shown below; and the invocation of the event is changed. 2. The Bar class is UNCHANGED. No need to subclass WeakEventManager, implement IWeakEventListener, etc. OK, so on to the implementation of WeakReferenceEvent. This is shown here. Note that it uses the generic WeakReference that I borrowed from here: http://damieng.com/blog/2006/08/01/implementingweakreferencet I had to add Equals() and GetHashCode() to his class, which I include below for reference. class WeakReferenceEvent { public static WeakReferenceEvent operator +(WeakReferenceEvent wre, Action handler) { wre._delegates.Add(new WeakReference<Action>(handler)); return wre; } public static WeakReferenceEvent operator -(WeakReferenceEvent wre, Action handler) { foreach (var del in wre._delegates) if (del.Target == handler) { wre._delegates.Remove(del); return wre; } return wre; } HashSet<WeakReference<Action>> _delegates = new HashSet<WeakReference<Action>>(); internal void Invoke() { HashSet<WeakReference<Action>> toRemove = null; foreach (var del in _delegates) { if (del.IsAlive) del.Target(); else { if (toRemove == null) toRemove = new HashSet<WeakReference<Action>>(); toRemove.Add(del); } } if (toRemove != null) foreach (var del in toRemove) _delegates.Remove(del); } } public class WeakReference<T> : IDisposable { private GCHandle handle; private bool trackResurrection; public WeakReference(T target) : this(target, false) { } public WeakReference(T target, bool trackResurrection) { this.trackResurrection = trackResurrection; this.Target = target; } ~WeakReference() { Dispose(); } public void Dispose() { handle.Free(); GC.SuppressFinalize(this); } public virtual bool IsAlive { get { return (handle.Target != null); } } public virtual bool TrackResurrection { get { return this.trackResurrection; } } public virtual T Target { get { object o = handle.Target; if ((o == null) || (!(o is T))) return default(T); else return (T)o; } set { handle = GCHandle.Alloc(value, this.trackResurrection ? GCHandleType.WeakTrackResurrection : GCHandleType.Weak); } } public override bool Equals(object obj) { var other = obj as WeakReference<T>; return other != null && Target.Equals(other.Target); } public override int GetHashCode() { return Target.GetHashCode(); } } It's functionality is trivial. I override operator + and - to get the += and -= syntactic sugar matching events. These create WeakReferences to the Action delegate. This allows the garbage collector to free the event target object (Bar in this example) when nobody else is holding on to it. In the Invoke() method, simply run through the weak references and call their Target Action. If any dead (i.e., garbage collected) references are found, remove them from the list. Of course, this only works with delegates of type Action. I tried making this generic, but ran into the missing where T : delegate in C#! As an alternative, simply modify class WeakReferenceEvent to be a WeakReferenceEvent, and replace the Action with Action. Fix the compiler errors and you have a class that can be used like so: class Foo { public WeakReferenceEvent<int> AnEvent = new WeakReferenceEvent<int>(); internal void DoEvent() { AnEvent.Invoke(5); } } Hopefully this will help someone else when they run into the mystery .NET event memory leak!

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• Segmentation fault when running a python script/GTKBuilder app?

  - by pythonscript

  I'm trying to learn GUI programming using python2 and GTKBuilder, but I get a segmentation fault when I run the code. This is my file, created in Glade as a GTKBuilder file: <?xml version="1.0" encoding="UTF-8"?> <interface> <!-- interface-requires gtk+ 3.0 --> <object class="GtkWindow" id="mainWindow"> <property name="can_focus">False</property> <child> <object class="GtkBox" id="box1"> <property name="visible">True</property> <property name="can_focus">False</property> <property name="orientation">vertical</property> <child> <object class="GtkBox" id="box2"> <property name="visible">True</property> <property name="can_focus">False</property> <property name="halign">start</property> <property name="margin_left">146</property> <property name="margin_right">276</property> <child> <object class="GtkLabel" id="label1"> <property name="visible">True</property> <property name="can_focus">False</property> <property name="label" translatable="yes">label</property> </object> <packing> <property name="expand">True</property> <property name="fill">False</property> <property name="position">0</property> </packing> </child> <child> <object class="GtkEntry" id="entryName"> <property name="visible">True</property> <property name="can_focus">True</property> <property name="margin_bottom">4</property> <property name="hexpand">True</property> <property name="vexpand">True</property> <property name="invisible_char">?</property> <property name="placeholder_text">Please enter your name here...</property> </object> <packing> <property name="expand">True</property> <property name="fill">True</property> <property name="position">1</property> </packing> </child> </object> <packing> <property name="expand">False</property> <property name="fill">True</property> <property name="position">0</property> </packing> </child> <child> <object class="GtkButton" id="buttonWriteNameToFile"> <property name="label" translatable="yes">button</property> <property name="use_action_appearance">False</property> <property name="visible">True</property> <property name="can_focus">True</property> <property name="receives_default">True</property> <property name="use_action_appearance">False</property> <signal name="clicked" handler="buttonWriteNameToFile_clicked" swapped="no"/> </object> <packing> <property name="expand">False</property> <property name="fill">True</property> <property name="position">1</property> </packing> </child> <child> <placeholder/> </child> <child> <placeholder/> </child> </object> </child> </object> </interface> My python code, based on this question, is this: #!/usr/bin/env python import gtk class NameApp: def __init__(self): filename = "project.glade" builder = gtk.Builder() builder.add_from_file(filename) builder.connect_signals(self) builder.get_object("mainWindow").show_all() def buttonWriteNameToFile_clicked(self, widget): print("File write code...") if __name__ == "__main__": app = NameApp() gtk.main() Running the file with python2 yields this error: name.py:9: Warning: cannot create instance of abstract (non-instantiatable) type `GtkBox' builder.add_from_file(filename) ./geany_run_script.sh: line 5: 14897 Segmentation fault python2 "name.py" I thought I followed that example as closely as possible, and I don't see any differences outside of the GTKBuilder file. However, the example in the linked question runs successfully on my machine. I don't know if it's relevant, but I'm running Arch Linux x86_64.

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• NServiceBus pipeline with Distributors

  - by David

  I'm building a processing pipeline with NServiceBus but I'm having trouble with the configuration of the distributors in order to make each step in the process scalable. Here's some info: The pipeline will have a master process that says "OK, time to start" for a WorkItem, which will then start a process like a flowchart. Each step in the flowchart may be computationally expensive, so I want the ability to scale out each step. This tells me that each step needs a Distributor. I want to be able to hook additional activities onto events later. This tells me I need to Publish() messages when it is done, not Send() them. A process may need to branch based on a condition. This tells me that a process must be able to publish more than one type of message. A process may need to join forks. I imagine I should use Sagas for this. Hopefully these assumptions are good otherwise I'm in more trouble than I thought. For the sake of simplicity, let's forget about forking or joining and consider a simple pipeline, with Step A followed by Step B, and ending with Step C. Each step gets its own distributor and can have many nodes processing messages. NodeA workers contain a IHandleMessages processor, and publish EventA NodeB workers contain a IHandleMessages processor, and publish Event B NodeC workers contain a IHandleMessages processor, and then the pipeline is complete. Here are the relevant parts of the config files, where # denotes the number of the worker, (i.e. there are input queues NodeA.1 and NodeA.2): NodeA: <MsmqTransportConfig InputQueue="NodeA.#" ErrorQueue="error" NumberOfWorkerThreads="1" MaxRetries="5" /> <UnicastBusConfig DistributorControlAddress="NodeA.Distrib.Control" DistributorDataAddress="NodeA.Distrib.Data" > <MessageEndpointMappings> </MessageEndpointMappings> </UnicastBusConfig> NodeB: <MsmqTransportConfig InputQueue="NodeB.#" ErrorQueue="error" NumberOfWorkerThreads="1" MaxRetries="5" /> <UnicastBusConfig DistributorControlAddress="NodeB.Distrib.Control" DistributorDataAddress="NodeB.Distrib.Data" > <MessageEndpointMappings> <add Messages="Messages.EventA, Messages" Endpoint="NodeA.Distrib.Data" /> </MessageEndpointMappings> </UnicastBusConfig> NodeC: <MsmqTransportConfig InputQueue="NodeC.#" ErrorQueue="error" NumberOfWorkerThreads="1" MaxRetries="5" /> <UnicastBusConfig DistributorControlAddress="NodeC.Distrib.Control" DistributorDataAddress="NodeC.Distrib.Data" > <MessageEndpointMappings> <add Messages="Messages.EventB, Messages" Endpoint="NodeB.Distrib.Data" /> </MessageEndpointMappings> </UnicastBusConfig> And here are the relevant parts of the distributor configs: Distributor A: <add key="DataInputQueue" value="NodeA.Distrib.Data"/> <add key="ControlInputQueue" value="NodeA.Distrib.Control"/> <add key="StorageQueue" value="NodeA.Distrib.Storage"/> Distributor B: <add key="DataInputQueue" value="NodeB.Distrib.Data"/> <add key="ControlInputQueue" value="NodeB.Distrib.Control"/> <add key="StorageQueue" value="NodeB.Distrib.Storage"/> Distributor C: <add key="DataInputQueue" value="NodeC.Distrib.Data"/> <add key="ControlInputQueue" value="NodeC.Distrib.Control"/> <add key="StorageQueue" value="NodeC.Distrib.Storage"/> I'm testing using 2 instances of each node, and the problem seems to come up in the middle at Node B. There are basically 2 things that might happen: Both instances of Node B report that it is subscribing to EventA, and also that NodeC.Distrib.Data@MYCOMPUTER is subscribing to the EventB that Node B publishes. In this case, everything works great. Both instances of Node B report that it is subscribing to EventA, however, one worker says NodeC.Distrib.Data@MYCOMPUTER is subscribing TWICE, while the other worker does not mention it. In the second case, which seem to be controlled only by the way the distributor routes the subscription messages, if the "overachiever" node processes an EventA, all is well. If the "underachiever" processes EventA, then the publish of EventB has no subscribers and the workflow dies. So, my questions: Is this kind of setup possible? Is the configuration correct? It's hard to find any examples of configuration with distributors beyond a simple one-level publisher/2-worker setup. Would it make more sense to have one central broker process that does all the non-computationally-intensive traffic cop operations, and only sends messages to processes behind distributors when the task is long-running and must be load balanced? Then the load-balanced nodes could simply reply back to the central broker, which seems easier. On the other hand, that seems at odds with the decentralization that is NServiceBus's strength. And if this is the answer, and the long running process's done event is a reply, how do you keep the Publish that enables later extensibility on published events?

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• PyML 0.7.2 - How to prevent accuracy from dropping after storing/loading a classifier?

  - by Michael Aaron Safyan

  This is a followup from "Save PyML.classifiers.multi.OneAgainstRest(SVM()) object?". The solution to that question was close, but not quite right, (the SparseDataSet is broken, so attempting to save/load with that dataset container type will fail, no matter what. Also, PyML is inconsistent in terms of whether labels should be numbers or strings... it turns out that the oneAgainstRest function is actually not good enough, because the labels need to be strings and simultaneously convertible to floats, because there are places where it is assumed to be a string and elsewhere converted to float) and so after a great deal of hacking and such I was finally able to figure out a way to save and load my multi-class classifier without it blowing up with an error.... however, although it is no longer giving me an error message, it is still not quite right as the accuracy of the classifier drops significantly when it is saved and then reloaded (so I'm still missing a piece of the puzzle). I am currently using the following custom mutli-class classifier for training, saving, and loading: class SVM(object): def __init__(self,features_or_filename,labels=None,kernel=None): if isinstance(features_or_filename,str): filename=features_or_filename; if labels!=None: raise ValueError,"Labels must be None if loading from a file."; with open(os.path.join(filename,"uniquelabels.list"),"rb") as uniquelabelsfile: self.uniquelabels=sorted(list(set(pickle.load(uniquelabelsfile)))); self.labeltoindex={}; for idx,label in enumerate(self.uniquelabels): self.labeltoindex[label]=idx; self.classifiers=[]; for classidx, classname in enumerate(self.uniquelabels): self.classifiers.append(PyML.classifiers.svm.loadSVM(os.path.join(filename,str(classname)+".pyml.svm"),datasetClass = PyML.VectorDataSet)); else: features=features_or_filename; if labels==None: raise ValueError,"Labels must not be None when training."; self.uniquelabels=sorted(list(set(labels))); self.labeltoindex={}; for idx,label in enumerate(self.uniquelabels): self.labeltoindex[label]=idx; points = [[float(xij) for xij in xi] for xi in features]; self.classifiers=[PyML.SVM(kernel) for label in self.uniquelabels]; for i in xrange(len(self.uniquelabels)): currentlabel=self.uniquelabels[i]; currentlabels=['+1' if k==currentlabel else '-1' for k in labels]; currentdataset=PyML.VectorDataSet(points,L=currentlabels,positiveClass='+1'); self.classifiers[i].train(currentdataset,saveSpace=False); def accuracy(self,pts,labels): logger=logging.getLogger("ml"); correct=0; total=0; classindexes=[self.labeltoindex[label] for label in labels]; h=self.hypotheses(pts); for idx in xrange(len(pts)): if h[idx]==classindexes[idx]: logger.info("RIGHT: Actual \"%s\" == Predicted \"%s\"" %(self.uniquelabels[ classindexes[idx] ], self.uniquelabels[ h[idx] ])); correct+=1; else: logger.info("WRONG: Actual \"%s\" != Predicted \"%s\"" %(self.uniquelabels[ classindexes[idx] ], self.uniquelabels[ h[idx] ])) total+=1; return float(correct)/float(total); def prediction(self,pt): h=self.hypothesis(pt); if h!=None: return self.uniquelabels[h]; return h; def predictions(self,pts): h=self.hypotheses(self,pts); return [self.uniquelabels[x] if x!=None else None for x in h]; def hypothesis(self,pt): bestvalue=None; bestclass=None; dataset=PyML.VectorDataSet([pt]); for classidx, classifier in enumerate(self.classifiers): val=classifier.decisionFunc(dataset,0); if (bestvalue==None) or (val>bestvalue): bestvalue=val; bestclass=classidx; return bestclass; def hypotheses(self,pts): bestvalues=[None for pt in pts]; bestclasses=[None for pt in pts]; dataset=PyML.VectorDataSet(pts); for classidx, classifier in enumerate(self.classifiers): for ptidx in xrange(len(pts)): val=classifier.decisionFunc(dataset,ptidx); if (bestvalues[ptidx]==None) or (val>bestvalues[ptidx]): bestvalues[ptidx]=val; bestclasses[ptidx]=classidx; return bestclasses; def save(self,filename): if not os.path.exists(filename): os.makedirs(filename); with open(os.path.join(filename,"uniquelabels.list"),"wb") as uniquelabelsfile: pickle.dump(self.uniquelabels,uniquelabelsfile,pickle.HIGHEST_PROTOCOL); for classidx, classname in enumerate(self.uniquelabels): self.classifiers[classidx].save(os.path.join(filename,str(classname)+".pyml.svm")); I am using the latest version of PyML (0.7.2, although PyML.__version__ is 0.7.0). When I construct the classifier with a training dataset, the reported accuracy is ~0.87. When I then save it and reload it, the accuracy is less than 0.001. So, there is something here that I am clearly not persisting correctly, although what that may be is completely non-obvious to me. Would you happen to know what that is?

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• C# UDP decoding datagrams fails randomly

  - by Tom Frey

  Hi, I'm experiencing an issue in a multi threaded application and have been debugging it for the last 3 days but for the life of it can not figure it out. I'm writing this, hoping that I either have a DUH moment when typing this or somebody sees something obvious in the code snippets I provide. Here's what's going on: I've been working on a new UDP networking library and have a data producer that multicasts UDP datagrams to several receiver applications. The sender sends on two different sockets that are bound to separate UDP multicast addresses and separate ports. The receiver application also creates two sockets and binds each one to one of the sender's multicast address/port. When the receiver receives the datagram, it copies it from the the buffer in a MemoryStream which is then put onto a thread safe queue, where another thread reads from it and decodes the data out of the MemoryStream. Both sockets have their own queues. What happens now is really weird, it happens randomly, non-reproducible and when I run multiple receiver applications, it only happens randomly on one of them every now and then. Basically, the thread that reads the MemoryStream out of the queue, reads it via a BinaryReader like ReadInt32(), etc. and thereby decodes the data. Every now and then however when it reads the data, the data it reads from it is incorrect, e.g. a negative integer number which the sender never would encode. However, as mentioned before, the decoding only fails in one of the receiver applications, in the other ones the datagram decodes fine. Now you might be saying, well, probably the UDP datagram has a byte corruption or something but I've logged every single datagram that's coming in and compared them on all receivers and the datagrams every application receives are absolutely identical. Now it gets even weirder, when I dump the datagram that failed to decode to disk and write a unit test that reads it and runs it through the decoder, it decodes just fine. Also when I wrap a try/catch around the decoder, reset the MemoryStream position in the catch and run it through the decoder again, it decodes just fine. To make it even weirder, this also only happens when I bind both sockets to read data from the sender, if I only bind one, it doesn't happen or at least I wasn't able to reproduce it. Here are is some corresponding code to what's going on: This is the receive callback for the socket: private void ReceiveCompleted(object sender, SocketAsyncEventArgs args) { if (args.SocketError != SocketError.Success) { InternalShutdown(args.SocketError); return; } if (args.BytesTransferred > SequencedUnitHeader.UNIT_HEADER_SIZE) { DataChunk chunk = new DataChunk(args.BytesTransferred); Buffer.BlockCopy(args.Buffer, 0, chunk.Buffer, 0, args.BytesTransferred); chunk.MemoryStream = new MemoryStream(chunk.Buffer); chunk.BinaryReader = new BinaryReader(chunk.MemoryStream); chunk.SequencedUnitHeader.SequenceID = chunk.BinaryReader.ReadUInt32(); chunk.SequencedUnitHeader.Count = chunk.BinaryReader.ReadByte(); if (prevSequenceID + 1 != chunk.SequencedUnitHeader.SequenceID) { log.Error("UdpDatagramGap\tName:{0}\tExpected:{1}\tReceived:{2}", unitName, prevSequenceID + 1, chunk.SequencedUnitHeader.SequenceID); } else if (chunk.SequencedUnitHeader.SequenceID < prevSequenceID) { log.Error("UdpOutOfSequence\tName:{0}\tExpected:{1}\tReceived:{2}", unitName, prevSequenceID + 1, chunk.SequencedUnitHeader.SequenceID); } prevSequenceID = chunk.SequencedUnitHeader.SequenceID; messagePump.Produce(chunk); } else UdpStatistics.FramesRxDiscarded++; Socket.InvokeAsyncMethod(Socket.ReceiveAsync, ReceiveCompleted, asyncReceiveArgs); } Here's some stub code that decodes the data: public static void OnDataChunk(DataChunk dataChunk) { try { for (int i = 0; i < dataChunk.SequencedUnitHeader.Count; i++) { int val = dataChunk.BinaryReader.ReadInt32(); if(val < 0) throw new Exception("EncodingException"); // do something with that value } } catch (Exception ex) { writer.WriteLine("ID:" + dataChunk.SequencedUnitHeader.SequenceID + " Count:" + dataChunk.SequencedUnitHeader.Count + " " + BitConverter.ToString(dataChunk.Buffer, 0, dataChunk.Size)); writer.Flush(); log.ErrorException("OnDataChunk", ex); log.Info("RETRY FRAME:{0} Data:{1}", dataChunk.SequencedUnitHeader.SequenceID, BitConverter.ToString(dataChunk.Buffer, 0, dataChunk.Size)); dataChunk.MemoryStream.Position = 0; dataChunk.SequencedUnitHeader.SequenceID = dataChunk.BinaryReader.ReadUInt32(); dataChunk.SequencedUnitHeader.Count = dataChunk.BinaryReader.ReadByte(); OnDataChunk(dataChunk); } } You see in the catch{} part I simply reset the MemoryStream.Position to 0 and call the same method again and it works just fine that next time? I'm really out of ideas at this point and unfortunately had no DUH moment writing this. Anybody have any kind of idea what might be going on or what else I could do to troubleshoot this? Thanks, Tom

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• IE6 + IE7 CSS problem with overflow: hidden; - position: relative; combo.

  - by googletorp

  So I have created a slider for a homepage, that slides some images with a title and teaser text using jQuery. Everything works fine, and I went to check IE and found that IE 6 and 7 kills my slider css completely. I can't figure out why, but for some reason I can't hide the non active slides with overflow: hidden; I've tried tweaking the css back and forth, but haven't been able to figure out what's causing the problem. I've recreated the problem in a more isolated html page. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="da" lang="da" dir="ltr"> <head> <style> body { width: 900px; } .column-1 { width: 500px; float: left; } .column-2 { width: 200px; float: left; } .column-3 { width: 200px; float: left; } ul { width: 2000px; left: -499px; position: relative; } li { list-style: none; display: block; float: left; } .item-list { overflow: hidden; width: 499px; } </style> </head> <body> <div class="column-1"> <div class="item-list clearfix"> <ul> <li class="first"> <div class="node-slide"> <img src="http://www.hanselman.com/blog/content/binary/lolcats-funny-pictures-leroy-jenkins.jpg" /> <div class="infobox"> <h4>Title 1</h4> <p>Teaser 1</p> </div> </div> </li> <li> <div class="slide"> <img src="http://www.hanselman.com/blog/content/binary/lolcats-funny-pictures-leroy-jenkins.jpg" /> <div class="infobox"> <h4>Title 2</h4> <p>Teaser 2</p> </div> </div> </li> <li class="last"> <div class="slide"> <img src="http://www.hanselman.com/blog/content/binary/lolcats-funny-pictures-leroy-jenkins.jpg" /> <div class="infobox"> <h4>Title 3</h4> <p>Teaser 3</p> </div> </div> </li> </ul> </div> </div> <div class="column-2"> ... </div> <div class="column-3"> ... </div> </body> </html> I've tracked down that it is the ul { position: relative; } on the ul element that is causing the overflow: hidden not to work, but why that is, I don't know. Also this is needed to make the slider javascript work using the left attribute on the ul to slide it. Any ideas as to how you can fix this is most welcome.

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• Arduino - AdHoc Network Setup

  - by methodMan

  I`m currently working with an arduino trying to build an adhoc network to which a device can connect to and send web request to. The problem I am currently having is that I can only set up one connection and then when that connection is terminated (client.stop()) all subsequent connections are not picked up by the server, even a curl command just sits there spinning. The first connection I start when I reset the server works fine and I am able to talk to the server; but after that, the arduino can no longer find new clients (even though it's trying with the library given). I`m using the sparkfun library for the wifly shield cloned from github, along with an Arduino Uno. My current code is based off their default example 'WiFly_AdHoc_Example' but I had to remove a few things to get the network to start up which might be the cause of this problem. Here is the .ino file that I am running. #include <SPI.h> #include <WiFly.h> //#include <SoftwareSerial.h> //SoftwareSerial mySerial( 5, 4); //Part from example not used(see below) WiFlyServer server(80); void setup() { Serial.begin(9600); //The code below is from the example but when I run it the WiFly will hang // on Wifly.begin(). Without it the WiFly starts up fine but only works for // one request. //mySerial.begin(9600); //WiFly.setUart(&mySerial); // Tell the WiFly library that we are not //using the SPIUart Serial.println("**************Starting WiFly**************"); // Enable Adhoc mod WiFly.begin(true); Serial.println("WiFly started, creating network."); if (!WiFly.createAdHocNetwork("wifly")) { Serial.print("Failed to create ad hoc network."); while (1) { // Hang on failure. } } Serial.println("Network created"); Serial.print("IP: "); Serial.println(WiFly.ip()); Serial.println("Starting Server..."); server.begin(); Serial.print("Server started, waiting for client."); } void loop() { delay(200); WiFlyClient client = server.available(); if (client) { Serial.println("Client Found."); // a string to store received commands String current_command = ""; while (client.connected()) { if (client.available()) { //Gets a character from the sent request. char c = client.read(); if (c=='#' || c=='\n') //End of extraneous output { current_command = ""; } else if(c!= '\n') { current_command+=c; } if (current_command== "get") { // output the value of each analog input pin for (int i = 0; i < 6; i++) { client.print("analog input "); client.print(i); client.print(" is "); client.print(analogRead(i)); client.println("<br />"); } } else if(current_command== "hello") { client.println("Hello there, I'm still here."); } else if (current_command== "quit") { client.println("Goodbye..."); client.stop(); current_command == ""; break; } else if (current_command == "*OPEN*") { current_command == ""; } } } // give the web browser time to receive the data delay(200); // close the connection client.stop(); } } If anyone understands this better then I (I`m new to arduino) please leave some helpful comments. Or just help me out on getting this little web server up and running so that I can hit it with more then one request. If there is any other helpful information I can provide please let me know. Thanks for reading and hope you can help. EDIT: Using telnet I can successfully connect (the first time) and send commands to the arduino including one to terminate the connection (calls the client.stop() method). But when I try to reconnect though telnet, it says the connection was successful but on the arduino it's still looping thinking the client is still false. WHAT??? I know right, I'm getting mixed messages from telnet vs arduino. None of the commands work obviously since the ardunio is still looping waiting for a client that evaluates to true. I'm gonna take a look at WiFlyServer from the library I imported and see if I can dig up the problem because somehow that server.available() method isn't finding new clients. Noticing a lot of TODO's in the library code.... EDIT: So I found the reason for the problem, it was in WiFlyServer.cpp file from the sparkfun library. The code that was causing the reconnect issue was infact in the server.availible() method. Right at the top of the method, there is a check: // TODO: Ensure no active non-server client connection. if (!WiFly.serverConnectionActive) { activeClient._port = 0; } For some reason when I comment this out, I can reconnect fine and everything works as it should. I will now dive into the library and see if I can fix this, I'm not exactly sure what this is doing but it gets called when the server connection is not active and is somehow blocking subsequent connections. Does anyone have any ideas how I might get to the root of this problem without using this commenting hack? Please help, no-one has commented or answered yet! Don't you want to join in on the fun???

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• Accessing py2exe program over network in Windows 98 throws ImportErrors

  - by darvids0n

  I'm running a py2exe-compiled python program from one server machine on a number of client machines (mapped to a network drive on every machine, say W:). For Windows XP and later machines, have so far had zero problems with Python picking up W:\python23.dll (yes, I'm using Python 2.3.5 for W98 compatibility and all that). It will then use W:\zlib.pyd to decompress W:\library.zip containing all the .pyc files like os and such, which are then imported and the program runs no problems. The issue I'm getting is on some Windows 98 SE machines (note: SOME Windows 98 SE machines, others seem to work with no apparent issues). What happens is, the program runs from W:, the W:\python23.dll is, I assume, found (since I'm getting Python ImportErrors, we'd need to be able to execute a Python import statement), but a couple of things don't work: 1) If W:\library.zip contains the only copy of the .pyc files, I get ZipImportError: can't decompress data; zlib not available (nonsense, considering W:\zlib.pyd IS available and works fine with the XP and higher machines on the same network). 2) If the .pyc files are actually bundled INSIDE the python exe by py2exe, OR put in the same directory as the .exe, OR put into a named subdirectory which is then set as part of the PYTHONPATH variable (e.g W:\pylib), I get ImportError: no module named os (os is the first module imported, before sys and anything else). Come to think of it, sys.path wouldn't be available to search if os was imported before it maybe? I'll try switching the order of those imports but my question still stands: Why is this a sporadic issue, working on some networks but not on others? And how would I force Python to find the files that are bundled inside the very executable I run? I have immediate access to the working Windows 98 SE machine, but I only get access to the non-working one (a customer of mine) every morning before their store opens. Thanks in advance! EDIT: Okay, big step forward. After debugging with PY2EXE_VERBOSE, the problem occurring on the specific W98SE machine is that it's not using the right path syntax when looking for imports. Firstly, it doesn't seem to read the PYTHONPATH environment variable (there may be a py2exe-specific one I'm not aware of, like PY2EXE_VERBOSE). Secondly, it only looks in one place before giving up (if the files are bundled inside the EXE, it looks there. If not, it looks in library.zip). EDIT 2: In fact, according to this, there is a difference between the sys.path in the Python interpreter and that of Py2exe executables. Specifically, sys.path contains only a single entry: the full pathname of the shared code archive. Blah. No fallbacks? Not even the current working directory? I'd try adding W:\ to PATH, but py2exe doesn't conform to any sort of standards for locating system libraries, so it won't work. Now for the interesting bit. The path it tries to load atexit, os, etc. from is: W:\\library.zip\<module>.<ext> Note the single slash after library.zip, but the double slash after the drive letter (someone correct me if this is intended and should work). It looks like if this is a string literal, then since the slash isn't doubled, it's read as an (invalid) escape sequence and the raw character is printed (giving W:\library.zipos.pyd, W:\library.zipos.dll, ... instead of with a slash); if it is NOT a string literal, the double slash might not be normpath'd automatically (as it should be) and so the double slash confuses the module loader. Like I said, I can't just set PYTHONPATH=W:\\library.zip\\ because it ignores that variable. It may be worth using sys.path.append at the start of my program but hard-coding module paths is an absolute LAST resort, especially since the problem occurs in ONE configuration of an outdated OS. Any ideas? I have one, which is to normpath the sys.path.. pity I need os for that. Another is to just append os.getenv('PATH') or os.getenv('PYTHONPATH') to sys.path... again, needing the os module. The site module also fails to initialise, so I can't use a .pth file. I also recently tried the following code at the start of the program: for pth in sys.path: fErr.write(pth) fErr.write(' to ') pth.replace('\\\\','\\') # Fix Windows 98 pathing issues fErr.write(pth) fErr.write('\n') But it can't load linecache.pyc, or anything else for that matter; it can't actually execute those commands from the looks of things. Is there any way to use built-in functionality which doesn't need linecache to modify the sys.path dynamically? Or am I reduced to hard-coding the correct sys.path?

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• PyML 0.7.2 - How to prevent accuracy from dropping after stroing/loading a classifier?

  - by Michael Aaron Safyan

  This is a followup from "Save PyML.classifiers.multi.OneAgainstRest(SVM()) object?". The solution to that question was close, but not quite right, (the SparseDataSet is broken, so attempting to save/load with that dataset container type will fail, no matter what. Also, PyML is inconsistent in terms of whether labels should be numbers or strings... it turns out that the oneAgainstRest function is actually not good enough, because the labels need to be strings and simultaneously convertible to floats, because there are places where it is assumed to be a string and elsewhere converted to float) and so after a great deal of hacking and such I was finally able to figure out a way to save and load my multi-class classifier without it blowing up with an error.... however, although it is no longer giving me an error message, it is still not quite right as the accuracy of the classifier drops significantly when it is saved and then reloaded (so I'm still missing a piece of the puzzle). I am currently using the following custom mutli-class classifier for training, saving, and loading: class SVM(object): def __init__(self,features_or_filename,labels=None,kernel=None): if isinstance(features_or_filename,str): filename=features_or_filename; if labels!=None: raise ValueError,"Labels must be None if loading from a file."; with open(os.path.join(filename,"uniquelabels.list"),"rb") as uniquelabelsfile: self.uniquelabels=sorted(list(set(pickle.load(uniquelabelsfile)))); self.labeltoindex={}; for idx,label in enumerate(self.uniquelabels): self.labeltoindex[label]=idx; self.classifiers=[]; for classidx, classname in enumerate(self.uniquelabels): self.classifiers.append(PyML.classifiers.svm.loadSVM(os.path.join(filename,str(classname)+".pyml.svm"),datasetClass = PyML.VectorDataSet)); else: features=features_or_filename; if labels==None: raise ValueError,"Labels must not be None when training."; self.uniquelabels=sorted(list(set(labels))); self.labeltoindex={}; for idx,label in enumerate(self.uniquelabels): self.labeltoindex[label]=idx; points = [[float(xij) for xij in xi] for xi in features]; self.classifiers=[PyML.SVM(kernel) for label in self.uniquelabels]; for i in xrange(len(self.uniquelabels)): currentlabel=self.uniquelabels[i]; currentlabels=['+1' if k==currentlabel else '-1' for k in labels]; currentdataset=PyML.VectorDataSet(points,L=currentlabels,positiveClass='+1'); self.classifiers[i].train(currentdataset,saveSpace=False); def accuracy(self,pts,labels): logger=logging.getLogger("ml"); correct=0; total=0; classindexes=[self.labeltoindex[label] for label in labels]; h=self.hypotheses(pts); for idx in xrange(len(pts)): if h[idx]==classindexes[idx]: logger.info("RIGHT: Actual \"%s\" == Predicted \"%s\"" %(self.uniquelabels[ classindexes[idx] ], self.uniquelabels[ h[idx] ])); correct+=1; else: logger.info("WRONG: Actual \"%s\" != Predicted \"%s\"" %(self.uniquelabels[ classindexes[idx] ], self.uniquelabels[ h[idx] ])) total+=1; return float(correct)/float(total); def prediction(self,pt): h=self.hypothesis(pt); if h!=None: return self.uniquelabels[h]; return h; def predictions(self,pts): h=self.hypotheses(self,pts); return [self.uniquelabels[x] if x!=None else None for x in h]; def hypothesis(self,pt): bestvalue=None; bestclass=None; dataset=PyML.VectorDataSet([pt]); for classidx, classifier in enumerate(self.classifiers): val=classifier.decisionFunc(dataset,0); if (bestvalue==None) or (val>bestvalue): bestvalue=val; bestclass=classidx; return bestclass; def hypotheses(self,pts): bestvalues=[None for pt in pts]; bestclasses=[None for pt in pts]; dataset=PyML.VectorDataSet(pts); for classidx, classifier in enumerate(self.classifiers): for ptidx in xrange(len(pts)): val=classifier.decisionFunc(dataset,ptidx); if (bestvalues[ptidx]==None) or (val>bestvalues[ptidx]): bestvalues[ptidx]=val; bestclasses[ptidx]=classidx; return bestclasses; def save(self,filename): if not os.path.exists(filename): os.makedirs(filename); with open(os.path.join(filename,"uniquelabels.list"),"wb") as uniquelabelsfile: pickle.dump(self.uniquelabels,uniquelabelsfile,pickle.HIGHEST_PROTOCOL); for classidx, classname in enumerate(self.uniquelabels): self.classifiers[classidx].save(os.path.join(filename,str(classname)+".pyml.svm")); I am using the latest version of PyML (0.7.2, although PyML.__version__ is 0.7.0). When I construct the classifier with a training dataset, the reported accuracy is ~0.87. When I then save it and reload it, the accuracy is less than 0.001. So, there is something here that I am clearly not persisting correctly, although what that may be is completely non-obvious to me. Would you happen to know what that is?

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• Intellij Idea 13.x and ASM 5.x library incompatible?

  - by Jarrod Roberson

  I can't get Intellij Idea 13.0 to compile my code against ASM 5.0.3 I have a multi-module Maven project. It compiles and installs successfully. Apparently com.google.findbugs:findbugs has a dependency on asm:asm:3.3 and I want to use org.ow2.asm:asm:5.0.3 to manipulate some bytecode. So in the parent pom.xml I exclude the asm:asm:3.3 dependencies from the classpath. This works fine when I run mvn install from the command line. I can't get the Build - Make Project menu selection to work in Intellij Idea. Here is the relevant parts of my pom.xml files. parent.pom <dependency> <groupId>org.ow2.asm</groupId> <artifactId>asm</artifactId> <version>5.0.3</version> </dependency> <dependency> <groupId>org.ow2.asm</groupId> <artifactId>asm-tree</artifactId> <version>5.0.3</version> </dependency> <dependency> <groupId>org.ow2.asm</groupId> <artifactId>asm-util</artifactId> <version>5.0.3</version> </dependency> <dependency> <groupId>org.ow2.asm</groupId> <artifactId>asm-commons</artifactId> <version>5.0.3</version> </dependency> <dependency> <groupId>com.google.code.findbugs</groupId> <artifactId>findbugs</artifactId> <version>2.0.3</version> <exclusions> <exclusion> <groupId>asm</groupId> <artifactId>asm</artifactId> </exclusion> <exclusion> <groupId>asm</groupId> <artifactId>asm-commons</artifactId> </exclusion> <exclusion> <groupId>asm</groupId> <artifactId>asm-tree</artifactId> </exclusion> </exclusions> </dependency> Here is the code that is failing 18 public static void main(final String[] args) throws IOException 19 { 20 final InputStream is = NotEmptyTest.class.getResourceAsStream("/com/vertigrated/annotation/NotEmptyTest.class"); 21 final ClassReader cr = new ClassReader(is); 22 final ClassNode cn = new ClassNode(); 23 cr.accept(cn, 0); 24 for (final MethodNode mn : cn.methods) 25 { 26 - 38 snipped for brevity 39 } 40 } 41 } Here is the error message: Information:Using javac 1.7.0_25 to compile java sources Information:java: Errors occurred while compiling module 'tests' Information:Compilation completed with 1 error and 2 warnings in 2 sec Information:1 error Information:2 warnings /<path to my source code>/NotEmptyTest.java Error:Error:line (24)java: incompatible types required: org.objectweb.asm.tree.MethodNode found: java.lang.Object Warning:Warning:java: /<path to my project>//NotEmptyTest.java uses unchecked or unsafe operations. Warning:Warning:java: Recompile with -Xlint:unchecked for details. As you can see in the screen capture, it reports the correct version of the libraries in the Javadoc but the AutoComplete shows the old 3.3 non-typesafe return value of List instead of List<MethodNode>: Here is what Maven knows, which is correct: [INFO] --- maven-dependency-plugin:2.8:list (default-cli) @ tests --- [INFO] [INFO] The following files have been resolved: [INFO] com.google.code.findbugs:bcel:jar:2.0.1:compile [INFO] junit:junit:jar:4.11:test [INFO] xml-apis:xml-apis:jar:1.0.b2:compile [INFO] com.apple:AppleJavaExtensions:jar:1.4:compile [INFO] javax.inject:javax.inject:jar:1:compile [INFO] jaxen:jaxen:jar:1.1.6:compile [INFO] org.ow2.asm:asm-util:jar:5.0.3:compile [INFO] com.google.inject:guice:jar:3.0:compile [INFO] dom4j:dom4j:jar:1.6.1:compile [INFO] com.google.code.findbugs:jFormatString:jar:2.0.1:compile [INFO] net.jcip:jcip-annotations:jar:1.0:compile [INFO] org.ow2.asm:asm-tree:jar:5.0.3:compile [INFO] commons-lang:commons-lang:jar:2.6:compile [INFO] com.google.code.findbugs:jsr305:jar:2.0.1:compile [INFO] org.hamcrest:hamcrest-core:jar:1.3:test [INFO] aopalliance:aopalliance:jar:1.0:compile [INFO] com.google.code.findbugs:findbugs:jar:2.0.3:compile [INFO] org.ow2.asm:asm-commons:jar:5.0.3:compile [INFO] org.ow2.asm:asm:jar:5.0.3:compile How do I get Intellij Idea to use the correct dependency internally?

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