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• android throw InvocationTargetException,How to modify the error

  - by fonter

  ActivityManager am = (ActivityManager)this.getSystemService(this.ACTIVITY_SERVICE); try { clearMethod = am.getClass() .getMethod("clearApplicationUserData", String.class, IPackageDataObserver.class); } catch (Exception e) { Log.e("Error", "Android Error",e); clearMethod = null; } if(clearMethod!=null){ try { clearMethod.invoke(am,"com.android.browser",new ClearUserDataObserver()); } catch (Exception e) { Log.e("Error", "Android Exception",e); } } Exception 05-26 08:34:13.056: ERROR/Error(739): java.lang.reflect.InvocationTargetException 05-26 08:34:13.056: ERROR/Error(739): at android.app.ActivityManager.clearApplicationUserData(ActivityManager.java:475) 05-26 08:34:13.056: ERROR/Error(739): at java.lang.reflect.Method.invokeNative(Native Method) 05-26 08:34:13.056: ERROR/Error(739): at java.lang.reflect.Method.invoke(Method.java:521) 05-26 08:34:13.056: ERROR/Error(739): at com.iwidsets.clear.manager.AndClear.onCreate(AndClear.java:34) 05-26 08:34:13.056: ERROR/Error(739): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123) 05-26 08:34:13.056: ERROR/Error(739): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364) 05-26 08:34:13.056: ERROR/Error(739): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2417) 05-26 08:34:13.056: ERROR/Error(739): at android.app.ActivityThread.access$2100(ActivityThread.java:116) 05-26 08:34:13.056: ERROR/Error(739): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794) 05-26 08:34:13.056: ERROR/Error(739): at android.os.Handler.dispatchMessage(Handler.java:99) 05-26 08:34:13.056: ERROR/Error(739): at android.os.Looper.loop(Looper.java:123) 05-26 08:34:13.056: ERROR/Error(739): at android.app.ActivityThread.main(ActivityThread.java:4203) 05-26 08:34:13.056: ERROR/Error(739): at java.lang.reflect.Method.invokeNative(Native Method) 05-26 08:34:13.056: ERROR/Error(739): at java.lang.reflect.Method.invoke(Method.java:521) 05-26 08:34:13.056: ERROR/Error(739): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791) 05-26 08:34:13.056: ERROR/Error(739): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549) 05-26 08:34:13.056: ERROR/Error(739): at dalvik.system.NativeStart.main(Native Method) 05-26 08:34:13.056: ERROR/Error(739): Caused by: java.lang.SecurityException: 739 does not have permission:android.permission.CLEAR_APP_USER_DATA to clear datafor process:com.android.browser 05-26 08:34:13.056: ERROR/Error(739): at android.os.Parcel.readException(Parcel.java:1218) 05-26 08:34:13.056: ERROR/Error(739): at android.os.Parcel.readException(Parcel.java:1206) 05-26 08:34:13.056: ERROR/Error(739): at android.app.ActivityManagerProxy.clearApplicationUserData(ActivityManagerNative.java:2016) 05-26 08:34:13.056: ERROR/Error(739): ... 17 more

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• Still about SSD potentials...write and read speed

  - by Macroideal

  HI Gurus, I have been working on SSD(solid state disk) for several months..Problems and Questions hit my head unexpectedly..Coz i am a virgin in ssd... Esp these days i was testing the write-read speed of ssd, which I was always caring.... however result turned out not good as I expected, or even worse Three kinds of read-write were implemented in my test 1. read and write directly from and into ssd, with openning ssd as a whole device. in windows: _open("\\:g", ***).. It can be very tricky and hairy that you'd write a data with size of folds of 512, at the disk position of folds of 512bytes... So, If you wanto write just a byte or 4 bytes, you'v to write at least a whole sector one time. 2. Read and write data from and into files located in SSD... 3. Read and Write data from and into files in mechanical Disk I compared the pratices below...I found ssd sucks...the ssd performs worse than mechanical disk... so i am wondering where i can get the potential performance of ssd, since ssd is said to a substitute for mechanical disk in the future.. Nevertheless, I test ssd with a pro-hard-disk tools..ssd is like twice speedier than mechanical disk. So, why? Thanx very much...If you know tips of ssd...follow me

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• Encoding a email address that can be used as part of a URL in codeigniter

  - by freedayum

  Is there a way to encode a email address that can be used as a part of a url in codeigniter?. I need to decode back the email address from the url. What I am trying to do is just a -forgotten password recovery- thing. I send a confirmation link to the user's email address, the link needs to be like ../encodedEmail/forgottenPasswordCode (with the forgottenPasswordCode updated in the db for the user with the submitted email). When the user visits that link, I decode the email(if the email - forgottenPasswordCode pair is in the table), i allow them to reset their password (and i reset forgottenPasswordCode back to null). I could just do a loop -checking the table with a select query- (or) -set that forgottenPasswordCode column unique, so i keep generating on a insert failure(would that be a lot faster ?)- until I generate a forgottenPasswordCode that doesn't already exist in the table. But the guy I do this for would not accept it this way:). He wants the checking be done with the user's email, he thinks its much faster. I am working with codeigniter, I used its encode() function, it seems to produce characters like '-slashes-' at times that breaks the encoded-email-string. Any other ideas?

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• Use of qsrand, random method that is not random

  - by Andy M

  Hey everyone, I'm having a strange problem here, and I can't manage to find a good explanation to it, so I thought of asking you guys : Consider the following method : int MathUtility::randomize(int Min, int Max) { qsrand(QTime::currentTime().msec()); if (Min > Max) { int Temp = Min; Min = Max; Max = Temp; } return ((rand()%(Max-Min+1))+Min); } I won't explain you gurus what this method actually does, I'll instead explain my problem : I realised that when I call this method in a loop, sometimes, I get the same random number over and over again... For example, this snippet... for(int i=0; i<10; ++i) { int Index = MathUtility::randomize(0, 1000); qDebug() << Index; } ...will produce something like : 567 567 567 567...etc... I realised too, that if I don't call qsrand everytime, but only once during my application's lifetime, it's working perfectly... My question : Why ?

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• Threading best practice when using SFTP in C#

  - by Christian

  Ok, this is more one of these "conceptual questions", but I hope I got some pointers in the right direction. First the desired scenario: I want to query an SFTP server for directory and file lists I want to upload or download files simulaneously Both things are pretty easy using a SFTP class provided by Tamir.SharpSsh, but if I only use one thread, it is kind of slow. Especially the recursion into subdirs gets very "UI blocking", because we are talking about 10.000 of directories. My basic approach is simple, create some kind of "pool" where I keep 10 open SFTP connections. Then query the first worker for a list of dirs. If this list was obtained, send the next free workers (e.g. 1-10, first one is also free again) to get the subdirectory details. As soon as there is a worker free, send him for the subsubdirs. And so on... I know the ThreadPool, simple Threads and did some Tests. What confuses me a little bit is the following: I basically need... A list of threads I create, say 10 Connect all threads to the server If a connection drops, create a new thread / sftp client If there is work to do, take the first free thread and handle the work I am currently not sure about the implementation details, especially the "work to do" and the "maintain list of threads" parts. Is it a good idea to: Enclose the work in an object, containing a job description (path) and a callback Send the threads into an infinite loop with 100ms wait to wait for work If SFTP is dead, either revive it, or kill the whole thread and create a new one How to encapsulate this, do I write my own "10ThreadsManager" or are there some out Ok, so far... Btw, I could also use PRISM events and commands, but I think the problem is unrelated. Perhaps the EventModel to signal a done processing of a "work package"... Thanks for any ideas, critic.. Chris

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• Change ObjectChoiceField Color not working on Blackberry OS 5.0

  - by Ari R. Fikri

  I want to create a custom ObjectChoiceField, the expected behavior is if the data change then upon leavinge the focus the font color will change. I have succeded in BB OS upto 4.7 but when tested on simulator and on real device with BB OS 5.0 the color won't change. This is my class : public class MyObjectChoiceField extends ObjectChoiceField { int color; Object oldValue, newValue; boolean isChanged; public MyObjectChoiceField(){ super(); oldValue = new Object(); newValue = new Object(); } public MyObjectChoiceField(int color, String label, String[] choices, int intP, long styleP){ super(label, choices, intP, styleP); this.color = color; } public void onUnfocus(){ if (getSelectedIndex() != -1){ newValue = getChoice(getSelectedIndex()); if (oldValue != newValue){ isChanged = true; invalidate(); } } super.onUnfocus(); } public void onFocus(int directionInt){ if (getSelectedIndex() != -1) oldValue = getChoice(getSelectedIndex()); super.onFocus(directionInt); } public void paint(Graphics g){ if (isChanged){ g.setColor(this.color); } super.paint(g); } What should I do to make this also work on BB OS 5.0. FYI : The ObjectChoiceField in BB 5.0 is look like a button with a triangle point down in the right side, which is different with BB OS 4.7.

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• Cannot find interface declaration for 'UIResponder'

  - by lfe-eo

  Hi all, I am running into this issue when trying to compile code for an iPhone app that I inherited from a previous developer. I've poked around on a couple forums and it seems like the culprit may be a circular #import somewhere. First - Is there any easy way to find if this is the case/find what files the loop is in? Second - Its definitely possible this isn't the problem. This is the full error (truncated file paths so its easier to view here): In file included from [...]/Frameworks/UIKit.framework/Headers/UIView.h:9, from [...]/Frameworks/UIKit.framework/Headers/UIActivityIndicatorView.h:8, from [...]/Frameworks/UIKit.framework/Headers/UIKit.h:11, from /Users/wbs/Documents/EINetIPhone/EINetIPhone_Prefix.pch:13: [...]/Frameworks/UIKit.framework/Headers/UIResponder.h:15: error: expected ')' before 'UIResponder' [...]/Frameworks/UIKit.framework/Headers/UIResponder.h:17: error: expected '{' before '-' token [...]/Frameworks/UIKit.framework/Headers/UIResponder.h:42: warning: '@end' must appear in an @implementation context [...]/Frameworks/UIKit.framework/Headers/UIResponder.h:51: error: expected ':' before ';' token [...]/Frameworks/UIKit.framework/Headers/UIResponder.h:58: error: cannot find interface declaration for 'UIResponder' As you can see, there are other errors alongside this one. These seem to be simple syntax errors, however, they appear in one of Apple's UIKit files (not my own) so I am seriously doubting that Apple's code is truly producing these errors. I'm stumped as to how to solve this issue. If anyone has any ideas of things I could try or ways/places I could get more info on the problem, I'd really appreciate it. I'm very new to Obj-C and iPhone coding.

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• Accessing an enum stored in a QVariant

  - by Henry Thacker

  Hi, I have registered an enumeration type "ClefType" within my header file - this enum is registered with the MetaObject system using the Q_DECLARE_METATYPE and Q_ENUMS macros. qRegisterMetaType is also called in the class constructor. This allows me to use this type in a Q_PROPERTY, this all works fine. However, later on, I need to be able to get hold of the Q_PROPERTY of this enum type, given the object - in a form that is suitable for serialization. Ideally, it would be useful to store the integer value for that enum member, because I don't want this to be specific to the type of enum that is used - eventually I want to have several different enums. // This is inside a loop over all the properties on a given object QMetaProperty property = metaObject->property(propertyId); QString propertyName = propertyMeta.name(); QVariant variantValue = propertyMeta.read(serializeObject); // If, internally, this QVariant is of type 'ClefType', // how do I pull out the integer value for this enum? Unfortunately variantValue.toInt(); does not work - custom enums don't seem to be directly 'castable' to an integer value. Thanks in advance, Henry

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• iPhone openGLES performance tuning

  - by genesys

  Hey there! I'm trying now for quite a while to optimize the framerate of my game without really making progress. I'm running on the newest iPhone SDK and have a iPhone 3G 3.1.2 device. I invoke arround 150 drawcalls, rendering about 1900 Triangles in total (all objects are textured using two texturelayers and multitexturing. most textures come from the same textureAtlasTexture stored in pvrtc 2bpp compressed texture). This renders on my phone at arround 30 fps, which appears to me to be way too low for only 1900 triangles. I tried many things to optimize the performance, including batching together the objects, transforming the vertices on the CPU and rendering them in a single drawcall. this yelds 8 drawcalls (as oposed to 150 drawcalls), but performance is about the same (fps drop to arround 26fps) I'm using 32byte vertices stored in an interleaved array (12bytes position, 12bytes normals, 8bytes uv). I'm rendering triangleLists and the vertices are ordered in TriStrip order. I did some profiling but I don't really know how to interprete it. instruments-sampling using Instruments and Sampling yelds this result: http://neo.cycovery.com/instruments_sampling.gif telling me that a lot of time is spent in "mach_msg_trap". I googled for it and it seems this function is called in order to wait for some other things. But wait for what?? instruments-openGL instruments with the openGL module yelds this result: http://neo.cycovery.com/intstruments_openglES_debug.gif but here i have really no idea what those numbers are telling me shark profiling: profiling with shark didn't tell me much either: http://neo.cycovery.com/shark_profile_release.gif the largest number is 10%, spent by DrawTriangles - and the whole rest is spent in very small percentage functions Can anyone tell me what else I could do in order to figure out the bottleneck and could help me to interprete those profiling information? Thanks a lot!

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• Best method of achieving bi-directional communication between Apple iPad "clients" and a Windows Ser

  - by user361910

  We are currently starting to build a client-server system which will see 10 or more Apple iPad client devices communicating to a central Windows server over a wireless LAN. We wanted to some existing plumbing (.NET remoting/WCF/web services/etc) that would allow us to implement a reliable, secure solution without having to start at a low level (e.g. sockets) and recreate the wheel. One of the major requirements that complicates this scenario is that unlike a traditional web service, the windows server needs to be able to arbitrarily notify the clients whenever certain events occur -- so it is not a simple request/response scenario like the web. Initially, we were going to use Windows clients, so our plan was to use the full-duplex mode of .NET WCF over HTTP|TCP. But now using the iPad, we don't have any of the WCF infrastructure. So my question is: what is the best way to allow an iPad and a Windows server to (securely) communicate over a LAN, with each device able to initiate communication to the other? Am I stuck writing low-level socket code? Thanks!

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• Iphone SQLite Databse with german umlauts results in NULL value

  - by Daniel

  Hi guys, I'm quite new to the Iphone development and after search for an answer for 3 hours now, I hope that you guys can give me a hand. My problem is that I have a SQLite Database with german umlauts. Looking at it with a SQLite browser tool shows me that the data is stored with german umlauts, correctly. But selecting fields with german umlauts in it results in a NULL value. I'm already using "stringWithUTF8String", so I don't get the point where the problem is placed. Here is my code: -(void) readSearchFromDatabase { searchFlag = YES; // Setup the database object sqlite3 *database; // Init the SCode Array searchSCodes = [[NSMutableArray alloc] init]; // Open the database from the users filessytem if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) { NSString *wildcard =@"%"; // Setup the SQL Statement and compile it NSString *sql = [NSString stringWithFormat:@"SELECT * FROM scode WHERE ta LIKE '%@%@%@' OR descriptionde LIKE '%@%@%@' OR descriptionen LIKE '%@%@%@'", wildcard, searchBar.text, wildcard, wildcard, searchBar.text, wildcard, wildcard, searchBar.text, wildcard, wildcard, searchBar.text, wildcard]; //Creating a const char SQL Statement especially for SQLite const char *sqlStatement = [sql UTF8String]; sqlite3_stmt *compiledStatement; if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK) { // Loop through the results and add them to the feeds array while(sqlite3_step(compiledStatement) == SQLITE_ROW) { // Read the data from the result row NSString *aTa = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 0)]; NSString *aReport = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 1)]; NSString *aDescriptionDE = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 2)]; NSString *aDescriptionEN = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 3)]; //Results a NULL value NSLog(@"Output: %@", aDescriptionDE); // Create a new SCode object with the data from the database SCode *searchSCode = [[SCode alloc] initWithTa:aTa report:aReport descriptionDE:aDescriptionDE descriptionEN:aDescriptionEN]; // Add the SCode object to the SCodes Array [searchSCodes addObject:searchSCode]; [searchSCode release]; } } // Release the compiled statement from memory sqlite3_finalize(compiledStatement); } sqlite3_close(database); }

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• Notification CeSetUserNotificationEx with custom sound

  - by inTagger

  Hail all! I want to display notification and play custom sound on my Windows Mobile 5/6 device. I have tried something like that, but my custom sound does not play, though message is displayed with standart sound. If i edit Wave key in [HKEY_CURRENT_USER\ControlPanel\Notifications{15F11F90-8A5F-454c-89FC-BA9B7AAB0CAD}] to sound file i need then it plays okay. But why there are flag NotificationAction.Sound and property UserNotification.Sound? It doesn't work. Also Vibration and Led don't work, if i use such flags. (You can obtain full project sources from http://dl.dropbox.com/u/1758206/Code/Thunder.zip) var trigger = new UserNotificationTrigger { StartTime = DateTime.Now + TimeSpan.FromSeconds(1), Type = NotificationType.ClassicTime }; var userNotification = new UserNotification { Sound = @"\Windows\Alarm1.wma", Text = "Hail from Penza, Russia!", Action = NotificationAction.Dialog | NotificationAction.Sound, Title = string.Empty, MaxSound = 16384 }; NotificationTools.SetUserNotification(0, trigger, userNotification); UserNotificationTrigger.cs: using System; using System.Runtime.InteropServices; namespace Thunder.Lib.ThunderMethod1 { /// <summary> /// Specifies the type of notification. /// </summary> public enum NotificationType { /// <summary> /// Equivalent to using the SetUserNotification function. /// The standard command line is supplied. /// </summary> ClassicTime = 4, /// <summary> /// System event notification. /// </summary> Event = 1, /// <summary> /// Time-based notification that is active for the time period between StartTime and EndTime. /// </summary> Period = 3, /// <summary> /// Time-based notification. /// </summary> Time = 2 } /// <summary> /// System Event Flags /// </summary> public enum NotificationEvent { None, TimeChange, SyncEnd, OnACPower, OffACPower, NetConnect, NetDisconnect, DeviceChange, IRDiscovered, RS232Detected, RestoreEnd, Wakeup, TimeZoneChange, MachineNameChange, RndisFNDetected, InternetProxyChange } /// <summary> /// Defines what event activates a notification. /// </summary> [StructLayout(LayoutKind.Sequential)] public class UserNotificationTrigger { internal int dwSize = 52; private int dwType; private int dwEvent; [MarshalAs(UnmanagedType.LPWStr)] private string lpszApplication = string.Empty; [MarshalAs(UnmanagedType.LPWStr)] private string lpszArguments; internal SYSTEMTIME stStartTime; internal SYSTEMTIME stEndTime; /// <summary> /// Specifies the type of notification. /// </summary> public NotificationType Type { get { return (NotificationType) dwType; } set { dwType = (int) value; } } /// <summary> /// Specifies the type of event should Type = Event. /// </summary> public NotificationEvent Event { get { return (NotificationEvent) dwEvent; } set { dwEvent = (int) value; } } /// <summary> /// Name of the application to execute. /// </summary> public string Application { get { return lpszApplication; } set { lpszApplication = value; } } /// <summary> /// Command line (without the application name). /// </summary> public string Arguments { get { return lpszArguments; } set { lpszArguments = value; } } /// <summary> /// Specifies the beginning of the notification period. /// </summary> public DateTime StartTime { get { return stStartTime.ToDateTime(); } set { stStartTime = SYSTEMTIME.FromDateTime(value); } } /// <summary> /// Specifies the end of the notification period. /// </summary> public DateTime EndTime { get { return stEndTime.ToDateTime(); } set { stEndTime = SYSTEMTIME.FromDateTime(value); } } } } UserNotification.cs: using System.Runtime.InteropServices; namespace Thunder.Lib.ThunderMethod1 { /// <summary> /// Contains information used for a user notification. /// </summary> [StructLayout(LayoutKind.Sequential)] public class UserNotification { private int ActionFlags; [MarshalAs(UnmanagedType.LPWStr)] private string pwszDialogTitle; [MarshalAs(UnmanagedType.LPWStr)] private string pwszDialogText; [MarshalAs(UnmanagedType.LPWStr)] private string pwszSound; private int nMaxSound; private int dwReserved; /// <summary> /// Any combination of the <see cref="T:Thunder.Lib.NotificationAction" /> members. /// </summary> /// <value>Flags which specifies the action(s) to be taken when the notification is triggered.</value> /// <remarks>Flags not valid on a given hardware platform will be ignored.</remarks> public NotificationAction Action { get { return (NotificationAction) ActionFlags; } set { ActionFlags = (int) value; } } /// <summary> /// Required if NotificationAction.Dialog is set, ignored otherwise /// </summary> public string Title { get { return pwszDialogTitle; } set { pwszDialogTitle = value; } } /// <summary> /// Required if NotificationAction.Dialog is set, ignored otherwise. /// </summary> public string Text { get { return pwszDialogText; } set { pwszDialogText = value; } } /// <summary> /// Sound string as supplied to PlaySound. /// </summary> public string Sound { get { return pwszSound; } set { pwszSound = value; } } public int MaxSound { get { return nMaxSound; } set { nMaxSound = value; } } } } NativeMethods.cs: using System; using System.Runtime.InteropServices; namespace Thunder.Lib.ThunderMethod1 { [StructLayout(LayoutKind.Sequential)] public struct SYSTEMTIME { public short wYear; public short wMonth; public short wDayOfWeek; public short wDay; public short wHour; public short wMinute; public short wSecond; public short wMillisecond; public static SYSTEMTIME FromDateTime(DateTime dt) { return new SYSTEMTIME { wYear = (short) dt.Year, wMonth = (short) dt.Month, wDayOfWeek = (short) dt.DayOfWeek, wDay = (short) dt.Day, wHour = (short) dt.Hour, wMinute = (short) dt.Minute, wSecond = (short) dt.Second, wMillisecond = (short) dt.Millisecond }; } public DateTime ToDateTime() { if ((((wYear == 0) && (wMonth == 0)) && ((wDay == 0) && (wHour == 0))) && ((wMinute == 0) && (wSecond == 0))) return DateTime.MinValue; return new DateTime(wYear, wMonth, wDay, wHour, wMinute, wSecond, wMillisecond); } } /// <summary> /// Specifies the action to take when a notification event occurs. /// </summary> [Flags] public enum NotificationAction { /// <summary> /// Displays the user notification dialog box. /// </summary> Dialog = 4, /// <summary> /// Flashes the LED. /// </summary> Led = 1, /// <summary> /// Dialog box z-order flag. /// Set if the notification dialog box should come up behind the password. /// </summary> Private = 32, /// <summary> /// Repeats the sound for 10–15 seconds. /// </summary> Repeat = 16, /// <summary> /// Plays the sound specified. /// </summary> Sound = 8, /// <summary> /// Vibrates the device. /// </summary> Vibrate = 2 } internal class NativeMethods { [DllImport("coredll.dll", CallingConvention = CallingConvention.Winapi, CharSet = CharSet.Unicode, SetLastError = true)] internal static extern int CeSetUserNotificationEx(int hNotification, UserNotificationTrigger lpTrigger, UserNotification lpUserNotification); } } NotificationTools.cs: using System.ComponentModel; using System.Runtime.InteropServices; namespace Thunder.Lib.ThunderMethod1 { public static class NotificationTools { /// <summary> /// This function modifies an existing user notification. /// </summary> /// <param name="handle">Handle of the Notification to be modified</param> /// <param name="trigger">A UserNotificationTrigger that defines what event activates a notification.</param> /// <param name="notification">A UserNotification that defines how the system should respond when a notification occurs.</param> /// <returns>Handle to the notification event if successful.</returns> public static int SetUserNotification(int handle, UserNotificationTrigger trigger, UserNotification notification) { int num = NativeMethods.CeSetUserNotificationEx(handle, trigger, notification); if (num == 0) throw new Win32Exception(Marshal.GetLastWin32Error(), "Error setting UserNotification"); return num; } } }

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• In Python epoll can I avoid the errno.EWOULDBLOCK, errno.EAGAIN ?

  - by davyzhang

  I wrote a epoll wrapper in python, It works fine but recently I found the performance is not not ideal for large package sending. I look down into the code and found there's actually a LOT of error Traceback (most recent call last): File "/Users/dawn/Documents/workspace/work/dev/server/sandbox/single_point/tcp_epoll.py", line 231, in send_now num_bytes = self.sock.send(self.response) error: [Errno 35] Resource temporarily unavailable and previously silent it as the document said, so my sending function was done this way: def send_now(self): '''send message at once''' st = time.time() times = 0 while self.response != '': try: num_bytes = self.sock.send(self.response) l.info('msg wrote %s %d : %r size %r',self.ip,self.port,self.response[:num_bytes],num_bytes) self.response = self.response[num_bytes:] except socket.error,e: if e[0] in (errno.EWOULDBLOCK,errno.EAGAIN): #here I printed it, but I silent it in normal days #print 'would block, again %r',tb.format_exc() break else: l.warning('%r %r socket error %r',self.ip,self.port,tb.format_exc()) #must break or cause dead loop break except: #other exceptions l.warning('%r %r msg write error %r',self.ip,self.port,tb.format_exc()) break times += 1 et = time.time() I googled it, and says it caused by temporarily network buffer run out So how can I manually and efficiently detect this error instead it goes to exception phase? Because it cause to much time to rasie/handle the exception.

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• App crashes only after second execution only in Release configuration

  - by denbec

  Hey all, i know this is probably not an easy question to answer, as it's hard to describe on my hand. I have an app that runs without problems on the device in Debug Configuration (also multiple times). Once I put it into Release Configuration (which I need before publishing?), the app starts without problems and I can proceed to the next page, where I show an core-plot graph. BUT only if I run it from xcode. As soon as I end the App and start it again, it opens without problems, but on the next page, it crashes. Now I don't have anything to debug other than the crash report: Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0xcf10000a Crashed Thread: 0 Thread 0 Crashed: 0 libobjc.A.dylib 0x000026f2 objc_msgSend + 14 1 StandbyCheck 0x0001fbea -[CPXYTheme newGraph] (CPXYTheme.m:36) 2 StandbyCheck 0x00007c06 -[SCGraphCell initWithStyle:reuseIdentifier:] (SCGraphCell.m:28) 3 StandbyCheck 0x00076b4a -[TTTableViewDataSource tableView:cellForRowAtIndexPath:] (TTTableViewDataSource.m:128) 4 UIKit 0x0007797a -[UITableView(UITableViewInternal) _createPreparedCellForGlobalRow:withIndexPath:] + 514 5 UIKit 0x000776b0 -[UITableView(UITableViewInternal) _createPreparedCellForGlobalRow:] + 28 6 UIKit 0x00037e78 -[UITableView(_UITableViewPrivate) _updateVisibleCellsNow] + 940 7 UIKit 0x000367d4 -[UITableView layoutSubviews] + 176 8 StandbyCheck 0x000734b8 -[TTTableView layoutSubviews] (TTTableView.m:226) [...] Now, can someone point in any direction? What are the differences in Debug/Release Modes? How could I possibly debug this failure? I've been searching for hours now, please help me :( Thanks, Dennis

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• Emacs Lisp: how to set encoding for call-process

  - by RamyenHead

  I thought I knew how to set coding-system (or encoding): use process-coding-system-alist. Apparently, it's not working. ;; -*- coding: utf-8 -*- (require 'cl) (let ((process-coding-system-alist '("cygwin/bin/bash" . (utf-8-dos . utf-8-unix)))) (setq my-words (list "Lilo" "?_?" "_?" "?_" "?" "Stitch") my-cygwin-bash "C:/cygwin/bin/bash.exe" my-outbuf (get-buffer-create "*my cygwin bash echo test*") ) (with-current-buffer my-outbuf (goto-char (point-max)) (loop for word in my-words do (insert (concat "echo " word "\n")) (call-process my-cygwin-bash nil my-outbuf nil "-c" (concat "echo " word))) ) (display-buffer my-outbuf) ) Running the above code, the output is this: echo Lilo Lilo echo ?_? /usr/bin/bash: -c: line 0: unexpected EOF while looking for matching `"' /usr/bin/bash: -c: line 1: syntax error: unexpected end of file echo _? /usr/bin/bash: -c: line 0: unexpected EOF while looking for matching `"' /usr/bin/bash: -c: line 1: syntax error: unexpected end of file echo ?_ /usr/bin/bash: $'echo \346\267\205?': command not found echo ? /usr/bin/bash: -c: line 0: unexpected EOF while looking for matching `"' /usr/bin/bash: -c: line 1: syntax error: unexpected end of file echo Stitch Stitch Anything sent to cygwin in unicode is failing (MS Windows, Korean).

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• Ruby rail debug output

  - by Darkerstar

  Hi all: I am just starting to write ruby rails. I wrote a controller but is getting wrong number of "arguments (1 for 0)" error, I can't understand why. It has no information on where the error occurred? It has a full list of stack traces but my controller file is not in there! In my controller I have just two methods, that I was going to test out activemq. But after I put the controller out, I got the above error, so I commented out all the code, but I still get the same error. I can't figure out why. I searched google for ruby debug, I have not found anything helpful. Here is my controller source: class ActivemqTestController < ApplicationController def send #client = Stomp::Client.open("stomp://localhost:61613") #station_id=101 #data = {'station_id' => station_id, 'username' => 'yangyanzhe'} #client.publish('/listener/add', data) end def receive #client = Stomp::Client.open("stomp://localhost:61613") # Processing loop #client.subscribe('/listener/add', headers) do |msg| # Process your message here # Your submitted data is in msg.body #puts msg['username'] + " joined " + msg['station_id'] + "\n" #client.acknowledge(msg) #end #client.join # Wait until listening thread dies end end This is the error: ArgumentError in Activemq testController#index wrong number of arguments (1 for 0) RAILS_ROOT: D:/rubyapps/radio Application Trace | Framework Trace | Full Trace f:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.5/lib/action_controller/base.rb:532:in `send' f:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.5/lib/action_controller/base.rb:532:in `process_without_filters' f:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.5/lib/action_controller/filters.rb:606:in `process' f:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.5/lib/action_controller/base.rb:391:in `process' f:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.5/lib/action_controller/base.rb:386:in `call' f:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.5/lib/action_controller/routing/route_set.rb:437:in `call' Thank you for any help in advance.

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• Sanity check: UIBarButtonItem crashes trying to perform action

  - by Giao

  One of my users is reporting a crash on his device, an iPhone 3GS. Other devices of the same type are not reporting similar behavior. He's sent me a crash log and based on reading it, I'm not sure how to proceed. I hope I'm not interpreting the crash log incorrectly but it doesn't look like my action has been called yet. This is how I'm creating and setting up the UIBarButtonItem: - (void)viewDidLoad { [super viewDidLoad]; UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(addLog:)]; self.navigationItem.rightBarButtonItem = addButton; [addButton release]; } This is the my action method: - (IBAction)addLog:(id)sender { MyViewController *myController = [[MyViewController alloc] initWithNibName:@"MyNib" bundle:nil]; UINavigationController *subNavigationController = [[UINavigationController alloc] initWithRootViewController: myController]; [self presentModalViewController:subNavigationController animated:YES]; [myController release]; [subNavigationController release]; } This is the crash log: Exception Type: EXC_CRASH (SIGABRT) Exception Codes: 0x00000000, 0x00000000Crashed Thread: 0 Thread 0 Crashed: 0 libSystem.B.dylib 0x0007e98c __kill + 81 libSystem.B.dylib 0x0007e97c kill + 4 2 libSystem.B.dylib 0x0007e96e raise + 10 3 libSystem.B.dylib 0x0009361a abort + 34 4 MyApp 0x000042e8 0x1000 + 13032 5 CoreFoundation 0x00058ede -[NSObject performSelector:withObject:withObject:] + 18 6 UIKit 0x0004205e -[UIApplication sendAction:to:from:forEvent:] + 78 7 UIKit 0x00094d4e -[UIBarButtonItem(Internal) _sendAction:withEvent:] + 86 8 CoreFoundation 0x00058ede -[NSObject performSelector:withObject:withObject:] + 18 9 UIKit 0x0004205e -[UIApplication sendAction:to:from:forEvent:] + 78 10 UIKit 0x00041ffe -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 26 11 UIKit 0x00041fd0 -[UIControl sendAction:to:forEvent:] + 32 12 UIKit 0x00041d2a -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 350 13 UIKit 0x0004263e -[UIControl touchesEnded:withEvent:] + 330 14 UIKit 0x00041656 -[UIWindow _sendTouchesForEvent:] + 318 15 UIKit 0x00041032 -[UIWindow sendEvent:] + 74

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• Big problem with Dijkstra algorithm in a linked list graph implementation

  - by Nazgulled

  Hi, I have my graph implemented with linked lists, for both vertices and edges and that is becoming an issue for the Dijkstra algorithm. As I said on a previous question, I'm converting this code that uses an adjacency matrix to work with my graph implementation. The problem is that when I find the minimum value I get an array index. This index would have match the vertex index if the graph vertexes were stored in an array instead. And the access to the vertex would be constant. I don't have time to change my graph implementation, but I do have an hash table, indexed by a unique number (but one that does not start at 0, it's like 100090000) which is the problem I'm having. Whenever I need, I use the modulo operator to get a number between 0 and the total number of vertices. This works fine for when I need an array index from the number, but when I need the number from the array index (to access the calculated minimum distance vertex in constant time), not so much. I tried to search for how to inverse the modulo operation, like, 100090000 mod 18000 = 10000 and, 10000 invmod 18000 = 100090000 but couldn't find a way to do it. My next alternative is to build some sort of reference array where, in the example above, arr[10000] = 100090000. That would fix the problem, but would require to loop the whole graph one more time. Do I have any better/easier solution with my current graph implementation?

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• Variable number of two-dimensional arrays into one big array

  - by qlb

  I have a variable number of two-dimensional arrays. The first dimension is variable, the second dimension is constant. i.e.: Object[][] array0 = { {"tim", "sanchez", 34, 175.5, "bla", "blub", "[email protected]"}, {"alice", "smith", 42, 160.0, "la", "bub", "[email protected]"}, ... }; Object[][] array1 = { {"john", "sdfs", 34, 15.5, "a", "bl", "[email protected]"}, {"joe", "smith", 42, 16.0, "a", "bub", "[email protected]"}, ... }; ... Object[][] arrayi = ... I'm generating these arrays with a for-loop: for (int i = 0; i < filter.length; i++) { MyClass c = new MyClass(filter[i]); //data = c.getData(); } Where "filter" is another array which is filled with information that tells "MyClass" how to fill the arrays. "getData()" gives back one of the i number of arrays. Now I just need to have everything in one big two dimensional array. i.e.: Object[][] arrayComplete = { {"tim", "sanchez", 34, 175.5, "bla", "blub", "[email protected]"}, {"alice", "smith", 42, 160.0, "la", "bub", "[email protected]"}, ... {"john", "sdfs", 34, 15.5, "a", "bl", "[email protected]"}, {"joe", "smith", 42, 16.0, "a", "bub", "[email protected]"}, ... ... }; In the end, I need a 2D array to feed my Swing TableModel. Any idea on how to accomplish this? It's blowing my mind right now.

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• Problem using AVAudioRecorder.

  - by tek3

  Hi all, I am facing a strange problem with AVAudioRecorder. In my application i need to record audio and play it. I am creating my player as : if(recorder) { if(recorder.recording) [recorder stop]; [recorder release]; recorder = nil; } NSString * filePath = [NSHomeDirectory() stringByAppendingPathComponent: [NSString stringWithFormat:@"Documents/%@.caf",songTitle]]; NSDictionary *recordSettings = [[NSDictionary alloc] initWithObjectsAndKeys: [NSNumber numberWithFloat: 44100.0],AVSampleRateKey, [NSNumber numberWithInt: kAudioFormatAppleIMA4],AVFormatIDKey, [NSNumber numberWithInt: 1], AVNumberOfChannelsKey, [NSNumber numberWithInt: AVAudioQualityMax],AVEncoderAudioQualityKey,nil]; recorder = [[AVAudioRecorder alloc] initWithURL: [NSURL fileURLWithPath:filePath] settings: recordSettings error: nil]; recorder.delegate = self; if ([recorder prepareToRecord] == YES){ [recorder record]; I am releasing and creating player every time i press record button. But the problem is that ,AVAudiorecorder is taking some time before starting to record , and so if i press record button multiple times continuously ,my application freezes for some time. The same code works fine without any problem when headphones are connected to device...there is no delay in recording, and the app doesn't freeze even if i press record button multiple times. Any help in this regard will be highly appreciated. Thanx in advance.

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• Activity has leaked window that was originally added

  - by Pentium10

  What's this error, why happens? 05-17 18:24:57.069: ERROR/WindowManager(18850): Activity com.mypkg.myP has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@44c46ff0 that was originally added here 05-17 18:24:57.069: ERROR/WindowManager(18850): android.view.WindowLeaked: Activity ccom.mypkg.myP has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@44c46ff0 that was originally added here 05-17 18:24:57.069: ERROR/WindowManager(18850): at android.view.ViewRoot.<init>(ViewRoot.java:231) 05-17 18:24:57.069: ERROR/WindowManager(18850): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148) 05-17 18:24:57.069: ERROR/WindowManager(18850): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91) 05-17 18:24:57.069: ERROR/WindowManager(18850): at android.view.Window$LocalWindowManager.addView(Window.java:424) 05-17 18:24:57.069: ERROR/WindowManager(18850): at android.app.Dialog.show(Dialog.java:239) 05-17 18:24:57.069: ERROR/WindowManager(18850): at com.mypkg.myP$PreparePairingLinkageData.onPreExecute(viewP.java:183) 05-17 18:24:57.069: ERROR/WindowManager(18850): at android.os.AsyncTask.execute(AsyncTask.java:391) 05-17 18:24:57.069: ERROR/WindowManager(18850): at com.mypkg.myP.onCreate(viewP.java:94) 05-17 18:24:57.069: ERROR/WindowManager(18850): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 05-17 18:24:57.069: ERROR/WindowManager(18850): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2544) 05-17 18:24:57.069: ERROR/WindowManager(18850): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2621) 05-17 18:24:57.069: ERROR/WindowManager(18850): at android.app.ActivityThread.access$2200(ActivityThread.java:126) 05-17 18:24:57.069: ERROR/WindowManager(18850): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1932) 05-17 18:24:57.069: ERROR/WindowManager(18850): at android.os.Handler.dispatchMessage(Handler.java:99) 05-17 18:24:57.069: ERROR/WindowManager(18850): at android.os.Looper.loop(Looper.java:123) 05-17 18:24:57.069: ERROR/WindowManager(18850): at android.app.ActivityThread.main(ActivityThread.java:4595) 05-17 18:24:57.069: ERROR/WindowManager(18850): at java.lang.reflect.Method.invokeNative(Native Method) 05-17 18:24:57.069: ERROR/WindowManager(18850): at java.lang.reflect.Method.invoke(Method.java:521) 05-17 18:24:57.069: ERROR/WindowManager(18850): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 05-17 18:24:57.069: ERROR/WindowManager(18850): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 05-17 18:24:57.069: ERROR/WindowManager(18850): at dalvik.system.NativeStart.main(Native Method)

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• UIAlertViewDelegate method didDismissWithButtonIndex gets called while the phone is sleeping/locked.

  - by Rob

  I have a UIAlertView who's didDismissWithButtonIndex delegate method calls pops the view controller (same class, it's the alertview delegate and the viewcontroller) to return the user to the previous screen. The issue is that when you lock the phone before the [alert show]; is called, something is calling didDismissWithButtonIndex while the phone is locked. Since the response to that is to pop the view controller, which releases and deallocs it, I crash on the callback. What is causing this phantom button press? Seems like a framework bug, but I hate jumping to that conclusion. I'm definitely not hitting the button, because I hit a breakpoint in my code right before it's displayed. Then I lock the phone. Then I continue. I see it do the show, return to the event loop, and then, while the phone is still locked, hit my breakpoint in didDismissWithButtonIndex. There are a few internet/forum postings about similar spurious delegate calls, but no concrete answers. This is on the simulator, and the device, both OS 2.2 and OS 3.0. I'm assuming I'm missing something, but what? Update: Yeah, I created a simple project with just two view controllers, where when the 2nd view controller displays it creates the alert, and shows it. Then I NSLog in the delegate method, and when the phone is locked, it fires once while locked, and then again when it's unlocked and the button is clicked...2 log messages. But when not locked, there's only one. I guess I'll open an issue, but it seems awfully obvious to have survived this long without anyone complaining. :-) I'm going to try and work around it by making an isActive flag value when the willResignActive/didBecomeActive notifications arrive, and if the app isn't active skipping the delegate body. Update I went ahead in July after I posted this and created radar 7097363 for this issue. There's been no response. The workaround in practice works quite well, checking the active status when processing the delegate, and skipping the action if the the app is inactive.

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• Why is my Android app camera preview running out of memory on my AVD?

  - by Bryan

  I have yet to try this on an actual device, but expect similar results. Anyway, long story short, whenever I run my app on the emulator, it crashes due to an out of memory exception. My code really is essentially the same as the camera preview API demo from google, which runs perfectly fine. The only file in the app (that I created/use) is as below- package berbst.musicReader; import java.io.IOException; import android.app.Activity; import android.content.Context; import android.hardware.Camera; import android.os.Bundle; import android.view.SurfaceHolder; import android.view.SurfaceView; /********************************* * Music Reader v.0001 * Still VERY under construction. * @author Bryan * *********************************/ public class MusicReader extends Activity { private MainScreen main; @Override //Begin activity public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); main = new MainScreen(this); setContentView(main); } class MainScreen extends SurfaceView implements SurfaceHolder.Callback { SurfaceHolder sHolder; Camera cam; MainScreen(Context context) { super(context); //Set up SurfaceHolder sHolder = getHolder(); sHolder.addCallback(this); sHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); } public void surfaceCreated(SurfaceHolder holder) { // Open the camera and start viewing cam = Camera.open(); try { cam.setPreviewDisplay(holder); } catch (IOException exception) { cam.release(); cam = null; } } public void surfaceDestroyed(SurfaceHolder holder) { // Kill all our crap with the surface cam.stopPreview(); cam.release(); cam = null; } public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) { // Modify parameters to match size. Camera.Parameters params = cam.getParameters(); params.setPreviewSize(w, h); cam.setParameters(params); cam.startPreview(); } } }

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• Nexus One & Windows XP USB Driver

  - by Stefan

  I've been unable to get my Nexus One working as a development phone on Windows XP. I've got the driver (revision 3 for N1 support), I've got it installed according to the official installation guide, and the phone appears in the Device Manager just as the guide says it should. However, adb still can't find the phone. 'adb devices', for example, returns no active devices. Am I forgetting some basic step? One thing I've noticed is that the driver is labeled in Windows as version 2 released November, 2009 (I need version 3 from January 2010 for N1 support). However, I've never had version 2 installed. I've used the SDK to download version 3 several times - even deleted it and redownloaded it. I've uninstalled/reinstalled the version 3 driver multiple times. It still says version 2. Is this the problem, or this something completely unrelated? Note: The phone is working as a dev phone on Ubuntu, so I know the phone/cable/etc. are good. It's either my fault or the driver's.

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• Double type returns -1.#IND/NaN error when calculating pi iteratively

  - by Draak

  I am working through a problem for my MCTS certification. The program has to calculate pi until the user presses a key, at which point the thread is aborted, the result returned to the main thread and printed in the console. Simple enough, right? This exercise is really meant to be about threading, but I'm running into another problem. The procedure that calculates pi returns -1.#IND. I've read some of the material on the web about this error, but I'm still not sure how to fix it. When I change double to Decimal type, I unsurprisingly get Overflow Exception very quickly. So, the question is how do I store the numbers correctly? Do I have to create a class to somehow store parts of the number when it gets too big to be contained in a Decimal? Class PiCalculator Dim a As Double = 1 Dim b As Double = 1 / Math.Sqrt(2) Dim t As Double = 1 / 4 Dim p As Double = 1 Dim pi As Double Dim callback As DelegateResult Sub New(ByVal _callback As DelegateResult) callback = _callback End Sub Sub Calculate() Try Do While True Dim a1 = (a + b) / 2 Dim b1 = Math.Sqrt(a * b) Dim t1 = t - p * (a - a1) ^ 2 Dim p1 = 2 * p a = a1 b = b1 t = t1 p = p1 pi = ((a + b) ^ 2) / (4 * t) Loop Catch ex As ThreadAbortException Finally callback(pi) End Try End Sub End Class

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