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  • SharePoint: what does "System.Runtime.InteropServices.COMException (0x81071003)" mean?

    - by kpinhack
    Hallo, i've got some code that imports documents into a SharePoint (WSS 3.0 SP1) document-library. That code works most of the time without any problems, but sometimes the document is not imported into the document-library and i get this nasty exception instead. Microsoft.SharePoint.SPException: Unable to update the information in the Microsoft Office document myFileName. ---> System.Runtime.InteropServices.COMException (0x81071003): Unable to update the information in the Microsoft Office document myFileName. bei Microsoft.SharePoint.Library.SPRequestInternalClass.AddOrUpdateItem(String bstrUrl, String bstrListName, Boolean bAdd, Boolean bSystemUpdate, Boolean bPreserveItemVersion, Boolean bUpdateNoVersion, Int32& plID, String& pbstrGuid, Guid pbstrNewDocId, Boolean bHasNewDocId, String bstrVersion, Object& pvarAttachmentNames, Object& pvarAttachmentContents, Object& pvarProperties, Boolean bCheckOut, Boolean bCheckin, Boolean bMigration, Boolean bPublish) bei Microsoft.SharePoint.Library.SPRequest.AddOrUpdateItem(String bstrUrl, String bstrListName, Boolean bAdd, Boolean bSystemUpdate, Boolean bPreserveItemVersion, Boolean bUpdateNoVersion, Int32& plID, String& pbstrGuid, Guid pbstrNewDocId, Boolean bHasNewDocId, String bstrVersion, Object& pvarAttachmentNames, Object& pvarAttachmentContents, Object& pvarProperties, Boolean bCheckOut, Boolean bCheckin, Boolean bMigration, Boolean bPublish) What does this exception mean? And why does it occur only sometimes? Thanks!

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  • What do the readonly attributes in diskpart really mean?

    - by marzipan
    I am wondering exactly what the meaning is of the "Read-only" disk and volume attributes that you can twiddle in diskpart on Windows 7. I am trying to set up an external USB drive as an installation medium for my own software, so I'd like to protect it against casual or inadvertent changes by users who it is given to, so they don't screw up the installation files they might need in the future. From what I can tell by experimentation with diskpart, the volume read-only attribute is actually stored on the physical disk somewhere, because I can set it and it shows up when I take the drive to another machine. This is great because my users can't (easily) change any of the files on the volume, or format it from Windows explorer. However, the disk read-only attribute seems to be just an aspect of how the current machine is accessing the drive. When I set it I can no longer delete the volume in the disk via Disk Management, but when I take the drive to another machine, the attribute is no longer set and in Disk Management I can delete the volume on the disk. I guess I'm not that worried about my users doing that, but I am annoyed that I don't understand what these attributes are really doing. Another thing that I don't understand is that the "volume" read-only attribute actually seems to be global to the disk - if I have two volumes on the disk, and I set the readonly flag on one of them, then it gets set on the other one too. ?!? I have the feeling I'm not searching for the right docs - all I'm finding is diskpart docs that give the syntax for twiddling these attributes, not what they really mean. Any pointers would be very welcome! Thanks, Asa

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  • On linux, what does it mean when a directory has size 0 instead of 4096?

    - by kdt
    Here's a strange thing I haven't seen before -- a directory whose size is reported by ls as 0 instead of 4096, and I can't create any files within it. # ls -ld lib home drwxr-xr-x. 2 root root 0 Feb 7 03:10 home <-- it has zero size dr-xr-xr-x. 11 root root 4096 Feb 4 09:28 lib # touch home/foo touch: cannot touch `home/foo': No such file or directory <-- and I can't create files in it # rm home rm: cannot remove `home': Is a directory <-- look, it really is a dir So what does it mean for a directory to have size 0 instead of 4096? Filesystem is ext4 on fedora core 14. The output of mount is: /dev/mapper/vg_dev-lv_root on / type ext4 (rw) proc on /proc type proc (rw) sysfs on /sys type sysfs (rw) devpts on /dev/pts type devpts (rw,gid=5,mode=620) tmpfs on /dev/shm type tmpfs (rw,rootcontext="system_u:object_r:tmpfs_t:s0") /dev/vda1 on /boot type ext4 (rw) none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw) sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw) Output of du -s /home: 0 /home Output of stat /home: File: `/home' Size: 0 Blocks: 0 IO Block: 1024 directory Device: 15h/21d Inode: 34913 Links: 2 Access: (0755/drwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2011-02-07 03:45:46.188995765 -0800 Modify: 2011-02-07 03:11:59.980995019 -0800 Change: 2011-02-06 07:58:45.874995002 -0800

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  • What does it mean to install two OS's alongside each other?

    - by Josh
    I currently have Windows 7 installed on my PC. However, I just tried out Ubuntu via booting from a disc and I love it. I want to install it onto my HDD, but I don't want to get rid of Windows 7. I know HOW to do this, but I am a little unsure what the consequences might be. What does it mean to install Ubuntu alongside Windows? Do they share the same resources? Also, I have my HDD already partitioned into two sections, a 70 GB section where Windows is installed and then another 400 GB section where all my data is stored. There is currently 26 GB free on the 70GB partition. I know Ubuntu doesn't take up much space. However, if I install Ubuntu in that space, will I still be able to install programs on Windows in the future? My main concern is that I am going to short-change my hard drive space for future installations. EDIT: I guess another big question I have is if I install a program on one OS, will the other be able to use it?

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  • change height in Android 2.2 LinearLayout in code

    - by Niro
    Im trying to change height of Layouts through the code without success. I've tried all of the examples i saw here and other site and my app just keep shutting down. xml code: <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/main_lay" android:orientation="vertical" tools:context=".MainActivity" > <LinearLayout android:id="@+id/layout_add" > </LinearLayout> <LinearLayout android:layout_width="fill_parent" android:layout_height="50dp" android:background="@color/green"> <ImageView android:layout_width="fill_parent" android:contentDescription="@string/desc" android:layout_height="45dp" android:layout_gravity="center_vertical|left" android:scaleType="fitStart" android:background="@color/orange" android:src="@drawable/logo" > </ImageView> </LinearLayout> </LinearLayout> Java code: main_layout=(LinearLayout)findViewById(R.id.main_lay); main_layout.setLayoutParams(new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT)); main_layout.setBackgroundResource(R.color.white); layout_add = (LinearLayout) findViewById(R.id.layout_add); layout_add.setLayoutParams(new FrameLayout.LayoutParams(LayoutParams.FILL_PARENT,50 )); layout_add.setBackgroundResource(R.color.dark_grey); I cant understand what im doing wrong. I've tried different ways to fix it. The Backround setting is working fine. Thank you guys Niro This is the Logcat 12-09 16:12:39.007: E/AnalyticsSDKTest.cpp(6338): Time w/ UTC Offset: 2012-12-09 12-09 16:16:14.517: E/ActivityManager(121): fail to set top app changed! 12-09 16:16:14.547: E/InputDispatcher(121): channel '4056b9c8 com.nirosadvice.converter/com.nirosadvice.converter.MainActivity (server)' ~ Consumer closed input channel or an error occurred. events=0x8 12-09 16:16:14.547: E/InputDispatcher(121): channel '4056b9c8 com.nirosadvice.converter/com.nirosadvice.converter.MainActivity (server)' ~ Channel is unrecoverably broken and will be disposed! 12-09 16:16:18.071: E/PVWmdrmProxy(5716): binder died for component: ComponentInfo{com.pv.wmdrmservice/com.pv.wmdrmservice.PVWmdrmService} 12-09 16:16:18.161: E/AndroidRuntime(18911): FATAL EXCEPTION: main 12-09 16:16:18.161: E/AndroidRuntime(18911): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.nirosadvice.converter/com.nirosadvice.converter.MainActivity}: java.lang.RuntimeException: Binary XML file line #1: You must supply a layout_width attribute. 12-09 16:16:18.161: E/AndroidRuntime(18911): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1821) 12-09 16:16:18.161: E/AndroidRuntime(18911): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1842) 12-09 16:16:18.161: E/AndroidRuntime(18911): at android.app.ActivityThread.access$1500(ActivityThread.java:132) 12-09 16:16:18.161: E/AndroidRuntime(18911): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1038) 12-09 16:16:18.161: E/AndroidRuntime(18911): at android.os.Handler.dispatchMessage(Handler.java:99) 12-09 16:16:18.161: E/AndroidRuntime(18911): at android.os.Looper.loop(Looper.java:150) 12-09 16:16:18.161: E/AndroidRuntime(18911): at android.app.ActivityThread.main(ActivityThread.java:4263) 12-09 16:16:18.161: E/AndroidRuntime(18911): at java.lang.reflect.Method.invokeNative(Native Method) 12-09 16:16:18.161: E/AndroidRuntime(18911): at java.lang.reflect.Method.invoke(Method.java:507) 12-09 16:16:18.161: E/AndroidRuntime(18911): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 12-09 16:16:18.161: E/AndroidRuntime(18911): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 12-09 16:16:18.161: E/AndroidRuntime(18911): at dalvik.system.NativeStart.main(Native Method) 12-09 16:16:18.161: E/AndroidRuntime(18911): Caused by: java.lang.RuntimeException: Binary XML file line #1: You must supply a layout_width attribute. 12-09 16:16:18.161: E/AndroidRuntime(18911): at android.content.res.TypedArray.getLayoutDimension(TypedArray.java:491) 12-09 16:16:18.161: E/AndroidRuntime(18911): at android.view.ViewGroup$LayoutParams.setBaseAttributes(ViewGroup.java:3684) 12-09 16:16:18.161: E/AndroidRuntime(18911): at android.view.ViewGroup$MarginLayoutParams.<init>(ViewGroup.java:3764) 12-09 16:16:18.161: E/AndroidRuntime(18911): at android.widget.FrameLayout$LayoutParams.<init>(FrameLayout.java:457) 12-09 16:16:18.161: E/AndroidRuntime(18911): at android.widget.FrameLayout.generateLayoutParams(FrameLayout.java:423) 12-09 16:16:18.161: E/AndroidRuntime(18911): at android.widget.FrameLayout.generateLayoutParams(FrameLayout.java:47) 12-09 16:16:18.161: E/AndroidRuntime(18911): at android.view.LayoutInflater.inflate(LayoutInflater.java:396) 12-09 16:16:18.161: E/AndroidRuntime(18911): at android.view.LayoutInflater.inflate(LayoutInflater.java:320) 12-09 16:16:18.161: E/AndroidRuntime(18911): at android.view.LayoutInflater.inflate(LayoutInflater.java:276) 12-09 16:16:18.161: E/AndroidRuntime(18911): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:231) 12-09 16:16:18.161: E/AndroidRuntime(18911): at android.app.Activity.setContentView(Activity.java:1715) 12-09 16:16:18.161: E/AndroidRuntime(18911): at com.nirosadvice.converter.MainActivity.onCreate(MainActivity.java:87) 12-09 16:16:18.161: E/AndroidRuntime(18911): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1072) 12-09 16:16:18.161: E/AndroidRuntime(18911): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1785) 12-09 16:16:18.161: E/AndroidRuntime(18911): ... 11 more Thanks After Iv'e added the attributes to the XML - this is what i'm getting : CatLog: 12-09 16:42:33.168: E/AndroidRuntime(19065): FATAL EXCEPTION: main 12-09 16:42:33.168: E/AndroidRuntime(19065): java.lang.ClassCastException: android.view.ViewGroup$LayoutParams 12-09 16:42:33.168: E/AndroidRuntime(19065): at android.widget.LinearLayout.measureVertical(LinearLayout.java:360) 12-09 16:42:33.168: E/AndroidRuntime(19065): at android.widget.LinearLayout.onMeasure(LinearLayout.java:309) 12-09 16:42:33.168: E/AndroidRuntime(19065): at android.view.View.measure(View.java:8526) 12-09 16:42:33.168: E/AndroidRuntime(19065): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3224) 12-09 16:42:33.168: E/AndroidRuntime(19065): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 12-09 16:42:33.168: E/AndroidRuntime(19065): at android.view.View.measure(View.java:8526) 12-09 16:42:33.168: E/AndroidRuntime(19065): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3224) 12-09 16:42:33.168: E/AndroidRuntime(19065): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 12-09 16:42:33.168: E/AndroidRuntime(19065): at android.view.View.measure(View.java:8526) 12-09 16:42:33.168: E/AndroidRuntime(19065): at android.view.ViewRoot.performTraversals(ViewRoot.java:902) 12-09 16:42:33.168: E/AndroidRuntime(19065): at android.view.ViewRoot.handleMessage(ViewRoot.java:1957) 12-09 16:42:33.168: E/AndroidRuntime(19065): at android.os.Handler.dispatchMessage(Handler.java:99) 12-09 16:42:33.168: E/AndroidRuntime(19065): at android.os.Looper.loop(Looper.java:150) 12-09 16:42:33.168: E/AndroidRuntime(19065): at android.app.ActivityThread.main(ActivityThread.java:4263) 12-09 16:42:33.168: E/AndroidRuntime(19065): at java.lang.reflect.Method.invokeNative(Native Method) 12-09 16:42:33.168: E/AndroidRuntime(19065): at java.lang.reflect.Method.invoke(Method.java:507) 12-09 16:42:33.168: E/AndroidRuntime(19065): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 12-09 16:42:33.168: E/AndroidRuntime(19065): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 12-09 16:42:33.168: E/AndroidRuntime(19065): at dalvik.system.NativeStart.main(Native Method) 12-09 16:42:39.023: E/AnalyticsSDKTest.cpp(6338): Time w/ UTC Offset: 2012-12-09 21:42:39-05:00 12-09 16:42:49.013: E/AndroidRuntime(19095): FATAL EXCEPTION: main 12-09 16:42:49.013: E/AndroidRuntime(19095): java.lang.ClassCastException: android.view.ViewGroup$LayoutParams 12-09 16:42:49.013: E/AndroidRuntime(19095): at android.widget.LinearLayout.measureVertical(LinearLayout.java:360) 12-09 16:42:49.013: E/AndroidRuntime(19095): at android.widget.LinearLayout.onMeasure(LinearLayout.java:309) 12-09 16:42:49.013: E/AndroidRuntime(19095): at android.view.View.measure(View.java:8526) 12-09 16:42:49.013: E/AndroidRuntime(19095): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3224) 12-09 16:42:49.013: E/AndroidRuntime(19095): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 12-09 16:42:49.013: E/AndroidRuntime(19095): at android.view.View.measure(View.java:8526) 12-09 16:42:49.013: E/AndroidRuntime(19095): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3224) 12-09 16:42:49.013: E/AndroidRuntime(19095): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 12-09 16:42:49.013: E/AndroidRuntime(19095): at android.view.View.measure(View.java:8526) 12-09 16:42:49.013: E/AndroidRuntime(19095): at android.view.ViewRoot.performTraversals(ViewRoot.java:902) 12-09 16:42:49.013: E/AndroidRuntime(19095): at android.view.ViewRoot.handleMessage(ViewRoot.java:1957) 12-09 16:42:49.013: E/AndroidRuntime(19095): at android.os.Handler.dispatchMessage(Handler.java:99) 12-09 16:42:49.013: E/AndroidRuntime(19095): at android.os.Looper.loop(Looper.java:150) 12-09 16:42:49.013: E/AndroidRuntime(19095): at android.app.ActivityThread.main(ActivityThread.java:4263) 12-09 16:42:49.013: E/AndroidRuntime(19095): at java.lang.reflect.Method.invokeNative(Native Method) 12-09 16:42:49.013: E/AndroidRuntime(19095): at java.lang.reflect.Method.invoke(Method.java:507) 12-09 16:42:49.013: E/AndroidRuntime(19095): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 12-09 16:42:49.013: E/AndroidRuntime(19095): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 12-09 16:42:49.013: E/AndroidRuntime(19095): at dalvik.system.NativeStart.main(Native Method) 12-09 16:44:00.913: E/AndroidRuntime(19148): FATAL EXCEPTION: main 12-09 16:44:00.913: E/AndroidRuntime(19148): java.lang.ClassCastException: android.view.ViewGroup$LayoutParams 12-09 16:44:00.913: E/AndroidRuntime(19148): at android.widget.LinearLayout.measureVertical(LinearLayout.java:360) 12-09 16:44:00.913: E/AndroidRuntime(19148): at android.widget.LinearLayout.onMeasure(LinearLayout.java:309) 12-09 16:44:00.913: E/AndroidRuntime(19148): at android.view.View.measure(View.java:8526) 12-09 16:44:00.913: E/AndroidRuntime(19148): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3224) 12-09 16:44:00.913: E/AndroidRuntime(19148): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 12-09 16:44:00.913: E/AndroidRuntime(19148): at android.view.View.measure(View.java:8526) 12-09 16:44:00.913: E/AndroidRuntime(19148): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3224) 12-09 16:44:00.913: E/AndroidRuntime(19148): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 12-09 16:44:00.913: E/AndroidRuntime(19148): at android.view.View.measure(View.java:8526) 12-09 16:44:00.913: E/AndroidRuntime(19148): at android.view.ViewRoot.performTraversals(ViewRoot.java:902) 12-09 16:44:00.913: E/AndroidRuntime(19148): at android.view.ViewRoot.handleMessage(ViewRoot.java:1957) 12-09 16:44:00.913: E/AndroidRuntime(19148): at android.os.Handler.dispatchMessage(Handler.java:99) 12-09 16:44:00.913: E/AndroidRuntime(19148): at android.os.Looper.loop(Looper.java:150) 12-09 16:44:00.913: E/AndroidRuntime(19148): at android.app.ActivityThread.main(ActivityThread.java:4263) 12-09 16:44:00.913: E/AndroidRuntime(19148): at java.lang.reflect.Method.invokeNative(Native Method) 12-09 16:44:00.913: E/AndroidRuntime(19148): at java.lang.reflect.Method.invoke(Method.java:507) 12-09 16:44:00.913: E/AndroidRuntime(19148): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 12-09 16:44:00.913: E/AndroidRuntime(19148): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 12-09 16:44:00.913: E/AndroidRuntime(19148): at dalvik.system.NativeStart.main(Native Method) 12-09 16:44:02.935: E/InputDispatcher(121): channel '4056b9c8 com.nirosadvice.converter/com.nirosadvice.converter.MainActivity (server)' ~ Consumer closed input channel or an error occurred. events=0x8 12-09 16:44:02.935: E/InputDispatcher(121): channel '4056b9c8 com.nirosadvice.converter/com.nirosadvice.converter.MainActivity (server)' ~ Channel is unrecoverably broken and will be disposed! 12-09 16:45:25.075: E/AndroidRuntime(19210): FATAL EXCEPTION: main 12-09 16:45:25.075: E/AndroidRuntime(19210): java.lang.ClassCastException: android.view.ViewGroup$LayoutParams 12-09 16:45:25.075: E/AndroidRuntime(19210): at android.widget.LinearLayout.measureVertical(LinearLayout.java:360) 12-09 16:45:25.075: E/AndroidRuntime(19210): at android.widget.LinearLayout.onMeasure(LinearLayout.java:309) 12-09 16:45:25.075: E/AndroidRuntime(19210): at android.view.View.measure(View.java:8526) 12-09 16:45:25.075: E/AndroidRuntime(19210): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3224) 12-09 16:45:25.075: E/AndroidRuntime(19210): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 12-09 16:45:25.075: E/AndroidRuntime(19210): at android.view.View.measure(View.java:8526) 12-09 16:45:25.075: E/AndroidRuntime(19210): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3224) 12-09 16:45:25.075: E/AndroidRuntime(19210): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 12-09 16:45:25.075: E/AndroidRuntime(19210): at android.view.View.measure(View.java:8526) 12-09 16:45:25.075: E/AndroidRuntime(19210): at android.view.ViewRoot.performTraversals(ViewRoot.java:902) 12-09 16:45:25.075: E/AndroidRuntime(19210): at android.view.ViewRoot.handleMessage(ViewRoot.java:1957) 12-09 16:45:25.075: E/AndroidRuntime(19210): at android.os.Handler.dispatchMessage(Handler.java:99) 12-09 16:45:25.075: E/AndroidRuntime(19210): at android.os.Looper.loop(Looper.java:150) 12-09 16:45:25.075: E/AndroidRuntime(19210): at android.app.ActivityThread.main(ActivityThread.java:4263) 12-09 16:45:25.075: E/AndroidRuntime(19210): at java.lang.reflect.Method.invokeNative(Native Method) 12-09 16:45:25.075: E/AndroidRuntime(19210): at java.lang.reflect.Method.invoke(Method.java:507) 12-09 16:45:25.075: E/AndroidRuntime(19210): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 12-09 16:45:25.075: E/AndroidRuntime(19210): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 12-09 16:45:25.075: E/AndroidRuntime(19210): at dalvik.system.NativeStart.main(Native Method) 12-09 16:50:34.507: E/AndroidRuntime(19358): FATAL EXCEPTION: main 12-09 16:50:34.507: E/AndroidRuntime(19358): java.lang.ClassCastException: android.view.ViewGroup$LayoutParams 12-09 16:50:34.507: E/AndroidRuntime(19358): at android.widget.LinearLayout.measureVertical(LinearLayout.java:360) 12-09 16:50:34.507: E/AndroidRuntime(19358): at android.widget.LinearLayout.onMeasure(LinearLayout.java:309) 12-09 16:50:34.507: E/AndroidRuntime(19358): at android.view.View.measure(View.java:8526) 12-09 16:50:34.507: E/AndroidRuntime(19358): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3224) 12-09 16:50:34.507: E/AndroidRuntime(19358): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 12-09 16:50:34.507: E/AndroidRuntime(19358): at android.view.View.measure(View.java:8526) 12-09 16:50:34.507: E/AndroidRuntime(19358): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3224) 12-09 16:50:34.507: E/AndroidRuntime(19358): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 12-09 16:50:34.507: E/AndroidRuntime(19358): at android.view.View.measure(View.java:8526) 12-09 16:50:34.507: E/AndroidRuntime(19358): at android.view.ViewRoot.performTraversals(ViewRoot.java:902) 12-09 16:50:34.507: E/AndroidRuntime(19358): at android.view.ViewRoot.handleMessage(ViewRoot.java:1957) 12-09 16:50:34.507: E/AndroidRuntime(19358): at android.os.Handler.dispatchMessage(Handler.java:99) 12-09 16:50:34.507: E/AndroidRuntime(19358): at android.os.Looper.loop(Looper.java:150) 12-09 16:50:34.507: E/AndroidRuntime(19358): at android.app.ActivityThread.main(ActivityThread.java:4263) 12-09 16:50:34.507: E/AndroidRuntime(19358): at java.lang.reflect.Method.invokeNative(Native Method) 12-09 16:50:34.507: E/AndroidRuntime(19358): at java.lang.reflect.Method.invoke(Method.java:507) 12-09 16:50:34.507: E/AndroidRuntime(19358): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 12-09 16:50:34.507: E/AndroidRuntime(19358): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 12-09 16:50:34.507: E/AndroidRuntime(19358): at dalvik.system.NativeStart.main(Native Method) Third try - after changing the Frame to Linear : 12-09 17:42:39.076: E/AnalyticsSDKTest.cpp(6338): Time w/ UTC Offset: 2012-12-09 22:42:39-05:00 12-09 17:55:44.141: E/ActivityManager(121): Fix ANR:broadcast when App died 12-09 17:55:44.722: E/AndroidRuntime(19469): FATAL EXCEPTION: main 12-09 17:55:44.722: E/AndroidRuntime(19469): java.lang.ClassCastException: android.view.ViewGroup$LayoutParams 12-09 17:55:44.722: E/AndroidRuntime(19469): at android.widget.LinearLayout.measureVertical(LinearLayout.java:360) 12-09 17:55:44.722: E/AndroidRuntime(19469): at android.widget.LinearLayout.onMeasure(LinearLayout.java:309) 12-09 17:55:44.722: E/AndroidRuntime(19469): at android.view.View.measure(View.java:8526) 12-09 17:55:44.722: E/AndroidRuntime(19469): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3224) 12-09 17:55:44.722: E/AndroidRuntime(19469): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 12-09 17:55:44.722: E/AndroidRuntime(19469): at android.view.View.measure(View.java:8526) 12-09 17:55:44.722: E/AndroidRuntime(19469): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3224) 12-09 17:55:44.722: E/AndroidRuntime(19469): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 12-09 17:55:44.722: E/AndroidRuntime(19469): at android.view.View.measure(View.java:8526) 12-09 17:55:44.722: E/AndroidRuntime(19469): at android.view.ViewRoot.performTraversals(ViewRoot.java:902) 12-09 17:55:44.722: E/AndroidRuntime(19469): at android.view.ViewRoot.handleMessage(ViewRoot.java:1957) 12-09 17:55:44.722: E/AndroidRuntime(19469): at android.os.Handler.dispatchMessage(Handler.java:99) 12-09 17:55:44.722: E/AndroidRuntime(19469): at android.os.Looper.loop(Looper.java:150) 12-09 17:55:44.722: E/AndroidRuntime(19469): at android.app.ActivityThread.main(ActivityThread.java:4263) 12-09 17:55:44.722: E/AndroidRuntime(19469): at java.lang.reflect.Method.invokeNative(Native Method) 12-09 17:55:44.722: E/AndroidRuntime(19469): at java.lang.reflect.Method.invoke(Method.java:507) 12-09 17:55:44.722: E/AndroidRuntime(19469): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 12-09 17:55:44.722: E/AndroidRuntime(19469): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 12-09 17:55:44.722: E/AndroidRuntime(19469): at dalvik.system.NativeStart.main(Native Method)

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  • Using the West Wind Web Toolkit to set up AJAX and REST Services

    - by Rick Strahl
    I frequently get questions about which option to use for creating AJAX and REST backends for ASP.NET applications. There are many solutions out there to do this actually, but when I have a choice - not surprisingly - I fall back to my own tools in the West Wind West Wind Web Toolkit. I've talked a bunch about the 'in-the-box' solutions in the past so for a change in this post I'll talk about the tools that I use in my own and customer applications to handle AJAX and REST based access to service resources using the West Wind West Wind Web Toolkit. Let me preface this by saying that I like things to be easy. Yes flexible is very important as well but not at the expense of over-complexity. The goal I've had with my tools is make it drop dead easy, with good performance while providing the core features that I'm after, which are: Easy AJAX/JSON Callbacks Ability to return any kind of non JSON content (string, stream, byte[], images) Ability to work with both XML and JSON interchangeably for input/output Access endpoints via POST data, RPC JSON calls, GET QueryString values or Routing interface Easy to use generic JavaScript client to make RPC calls (same syntax, just what you need) Ability to create clean URLS with Routing Ability to use standard ASP.NET HTTP Stack for HTTP semantics It's all about options! In this post I'll demonstrate most of these features (except XML) in a few simple and short samples which you can download. So let's take a look and see how you can build an AJAX callback solution with the West Wind Web Toolkit. Installing the Toolkit Assemblies The easiest and leanest way of using the Toolkit in your Web project is to grab it via NuGet: West Wind Web and AJAX Utilities (Westwind.Web) and drop it into the project by right clicking in your Project and choosing Manage NuGet Packages from anywhere in the Project.   When done you end up with your project looking like this: What just happened? Nuget added two assemblies - Westwind.Web and Westwind.Utilities and the client ww.jquery.js library. It also added a couple of references into web.config: The default namespaces so they can be accessed in pages/views and a ScriptCompressionModule that the toolkit optionally uses to compress script resources served from within the assembly (namely ww.jquery.js and optionally jquery.js). Creating a new Service The West Wind Web Toolkit supports several ways of creating and accessing AJAX services, but for this post I'll stick to the lower level approach that works from any plain HTML page or of course MVC, WebForms, WebPages. There's also a WebForms specific control that makes this even easier but I'll leave that for another post. So, to create a new standalone AJAX/REST service we can create a new HttpHandler in the new project either as a pure class based handler or as a generic .ASHX handler. Both work equally well, but generic handlers don't require any web.config configuration so I'll use that here. In the root of the project add a Generic Handler. I'm going to call this one StockService.ashx. Once the handler has been created, edit the code and remove all of the handler body code. Then change the base class to CallbackHandler and add methods that have a [CallbackMethod] attribute. Here's the modified base handler implementation now looks like with an added HelloWorld method: using System; using Westwind.Web; namespace WestWindWebAjax { /// <summary> /// Handler implements CallbackHandler to provide REST/AJAX services /// </summary> public class SampleService : CallbackHandler { [CallbackMethod] public string HelloWorld(string name) { return "Hello " + name + ". Time is: " + DateTime.Now.ToString(); } } } Notice that the class inherits from CallbackHandler and that the HelloWorld service method is marked up with [CallbackMethod]. We're done here. Services Urlbased Syntax Once you compile, the 'service' is live can respond to requests. All CallbackHandlers support input in GET and POST formats, and can return results as JSON or XML. To check our fancy HelloWorld method we can now access the service like this: http://localhost/WestWindWebAjax/StockService.ashx?Method=HelloWorld&name=Rick which produces a default JSON response - in this case a string (wrapped in quotes as it's JSON): (note by default JSON will be downloaded by most browsers not displayed - various options are available to view JSON right in the browser) If I want to return the same data as XML I can tack on a &format=xml at the end of the querystring which produces: <string>Hello Rick. Time is: 11/1/2011 12:11:13 PM</string> Cleaner URLs with Routing Syntax If you want cleaner URLs for each operation you can also configure custom routes on a per URL basis similar to the way that WCF REST does. To do this you need to add a new RouteHandler to your application's startup code in global.asax.cs one for each CallbackHandler based service you create: protected void Application_Start(object sender, EventArgs e) { CallbackHandlerRouteHandler.RegisterRoutes<StockService>(RouteTable.Routes); } With this code in place you can now add RouteUrl properties to any of your service methods. For the HelloWorld method that doesn't make a ton of sense but here is what a routed clean URL might look like in definition: [CallbackMethod(RouteUrl="stocks/HelloWorld/{name}")] public string HelloWorld(string name) { return "Hello " + name + ". Time is: " + DateTime.Now.ToString(); } The same URL I previously used now becomes a bit shorter and more readable with: http://localhost/WestWindWebAjax/HelloWorld/Rick It's an easy way to create cleaner URLs and still get the same functionality. Calling the Service with $.getJSON() Since the result produced is JSON you can now easily consume this data using jQuery's getJSON method. First we need a couple of scripts - jquery.js and ww.jquery.js in the page: <!DOCTYPE html> <html> <head> <link href="Css/Westwind.css" rel="stylesheet" type="text/css" /> <script src="scripts/jquery.min.js" type="text/javascript"></script> <script src="scripts/ww.jquery.min.js" type="text/javascript"></script> </head> <body> Next let's add a small HelloWorld example form (what else) that has a single textbox to type a name, a button and a div tag to receive the result: <fieldset> <legend>Hello World</legend> Please enter a name: <input type="text" name="txtHello" id="txtHello" value="" /> <input type="button" id="btnSayHello" value="Say Hello (POST)" /> <input type="button" id="btnSayHelloGet" value="Say Hello (GET)" /> <div id="divHelloMessage" class="errordisplay" style="display:none;width: 450px;" > </div> </fieldset> Then to call the HelloWorld method a little jQuery is used to hook the document startup and the button click followed by the $.getJSON call to retrieve the data from the server. <script type="text/javascript"> $(document).ready(function () { $("#btnSayHelloGet").click(function () { $.getJSON("SampleService.ashx", { Method: "HelloWorld", name: $("#txtHello").val() }, function (result) { $("#divHelloMessage") .text(result) .fadeIn(1000); }); });</script> .getJSON() expects a full URL to the endpoint of our service, which is the ASHX file. We can either provide a full URL (SampleService.ashx?Method=HelloWorld&name=Rick) or we can just provide the base URL and an object that encodes the query string parameters for us using an object map that has a property that matches each parameter for the server method. We can also use the clean URL routing syntax, but using the object parameter encoding actually is safer as the parameters will get properly encoded by jQuery. The result returned is whatever the result on the server method is - in this case a string. The string is applied to the divHelloMessage element and we're done. Obviously this is a trivial example, but it demonstrates the basics of getting a JSON response back to the browser. AJAX Post Syntax - using ajaxCallMethod() The previous example allows you basic control over the data that you send to the server via querystring parameters. This works OK for simple values like short strings, numbers and boolean values, but doesn't really work if you need to pass something more complex like an object or an array back up to the server. To handle traditional RPC type messaging where the idea is to map server side functions and results to a client side invokation, POST operations can be used. The easiest way to use this functionality is to use ww.jquery.js and the ajaxCallMethod() function. ww.jquery wraps jQuery's AJAX functions and knows implicitly how to call a CallbackServer method with parameters and parse the result. Let's look at another simple example that posts a simple value but returns something more interesting. Let's start with the service method: [CallbackMethod(RouteUrl="stocks/{symbol}")] public StockQuote GetStockQuote(string symbol) { Response.Cache.SetExpires(DateTime.UtcNow.Add(new TimeSpan(0, 2, 0))); StockServer server = new StockServer(); var quote = server.GetStockQuote(symbol); if (quote == null) throw new ApplicationException("Invalid Symbol passed."); return quote; } This sample utilizes a small StockServer helper class (included in the sample) that downloads a stock quote from Yahoo's financial site via plain HTTP GET requests and formats it into a StockQuote object. Lets create a small HTML block that lets us query for the quote and display it: <fieldset> <legend>Single Stock Quote</legend> Please enter a stock symbol: <input type="text" name="txtSymbol" id="txtSymbol" value="msft" /> <input type="button" id="btnStockQuote" value="Get Quote" /> <div id="divStockDisplay" class="errordisplay" style="display:none; width: 450px;"> <div class="label-left">Company:</div> <div id="stockCompany"></div> <div class="label-left">Last Price:</div> <div id="stockLastPrice"></div> <div class="label-left">Quote Time:</div> <div id="stockQuoteTime"></div> </div> </fieldset> The final result looks something like this:   Let's hook up the button handler to fire the request and fill in the data as shown: $("#btnStockQuote").click(function () { ajaxCallMethod("SampleService.ashx", "GetStockQuote", [$("#txtSymbol").val()], function (quote) { $("#divStockDisplay").show().fadeIn(1000); $("#stockCompany").text(quote.Company + " (" + quote.Symbol + ")"); $("#stockLastPrice").text(quote.LastPrice); $("#stockQuoteTime").text(quote.LastQuoteTime.formatDate("MMM dd, HH:mm EST")); }, onPageError); }); So we point at SampleService.ashx and the GetStockQuote method, passing a single parameter of the input symbol value. Then there are two handlers for success and failure callbacks.  The success handler is the interesting part - it receives the stock quote as a result and assigns its values to various 'holes' in the stock display elements. The data that comes back over the wire is JSON and it looks like this: { "Symbol":"MSFT", "Company":"Microsoft Corpora", "OpenPrice":26.11, "LastPrice":26.01, "NetChange":0.02, "LastQuoteTime":"2011-11-03T02:00:00Z", "LastQuoteTimeString":"Nov. 11, 2011 4:20pm" } which is an object representation of the data. JavaScript can evaluate this JSON string back into an object easily and that's the reslut that gets passed to the success function. The quote data is then applied to existing page content by manually selecting items and applying them. There are other ways to do this more elegantly like using templates, but here we're only interested in seeing how the data is returned. The data in the object is typed - LastPrice is a number and QuoteTime is a date. Note about the date value: JavaScript doesn't have a date literal although the JSON embedded ISO string format used above  ("2011-11-03T02:00:00Z") is becoming fairly standard for JSON serializers. However, JSON parsers don't deserialize dates by default and return them by string. This is why the StockQuote actually returns a string value of LastQuoteTimeString for the same date. ajaxMethodCallback always converts dates properly into 'real' dates and the example above uses the real date value along with a .formatDate() data extension (also in ww.jquery.js) to display the raw date properly. Errors and Exceptions So what happens if your code fails? For example if I pass an invalid stock symbol to the GetStockQuote() method you notice that the code does this: if (quote == null) throw new ApplicationException("Invalid Symbol passed."); CallbackHandler automatically pushes the exception message back to the client so it's easy to pick up the error message. Regardless of what kind of error occurs: Server side, client side, protocol errors - any error will fire the failure handler with an error object parameter. The error is returned to the client via a JSON response in the error callback. In the previous examples I called onPageError which is a generic routine in ww.jquery that displays a status message on the bottom of the screen. But of course you can also take over the error handling yourself: $("#btnStockQuote").click(function () { ajaxCallMethod("SampleService.ashx", "GetStockQuote", [$("#txtSymbol").val()], function (quote) { $("#divStockDisplay").fadeIn(1000); $("#stockCompany").text(quote.Company + " (" + quote.Symbol + ")"); $("#stockLastPrice").text(quote.LastPrice); $("#stockQuoteTime").text(quote.LastQuoteTime.formatDate("MMM dd, hh:mmt")); }, function (error, xhr) { $("#divErrorDisplay").text(error.message).fadeIn(1000); }); }); The error object has a isCallbackError, message and  stackTrace properties, the latter of which is only populated when running in Debug mode, and this object is returned for all errors: Client side, transport and server side errors. Regardless of which type of error you get the same object passed (as well as the XHR instance optionally) which makes for a consistent error retrieval mechanism. Specifying HttpVerbs You can also specify HTTP Verbs that are allowed using the AllowedHttpVerbs option on the CallbackMethod attribute: [CallbackMethod(AllowedHttpVerbs=HttpVerbs.GET | HttpVerbs.POST)] public string HelloWorld(string name) { … } If you're building REST style API's this might be useful to force certain request semantics onto the client calling. For the above if call with a non-allowed HttpVerb the request returns a 405 error response along with a JSON (or XML) error object result. The default behavior is to allow all verbs access (HttpVerbs.All). Passing in object Parameters Up to now the parameters I passed were very simple. But what if you need to send something more complex like an object or an array? Let's look at another example now that passes an object from the client to the server. Keeping with the Stock theme here lets add a method called BuyOrder that lets us buy some shares for a stock. Consider the following service method that receives an StockBuyOrder object as a parameter: [CallbackMethod] public string BuyStock(StockBuyOrder buyOrder) { var server = new StockServer(); var quote = server.GetStockQuote(buyOrder.Symbol); if (quote == null) throw new ApplicationException("Invalid or missing stock symbol."); return string.Format("You're buying {0} shares of {1} ({2}) stock at {3} for a total of {4} on {5}.", buyOrder.Quantity, quote.Company, quote.Symbol, quote.LastPrice.ToString("c"), (quote.LastPrice * buyOrder.Quantity).ToString("c"), buyOrder.BuyOn.ToString("MMM d")); } public class StockBuyOrder { public string Symbol { get; set; } public int Quantity { get; set; } public DateTime BuyOn { get; set; } public StockBuyOrder() { BuyOn = DateTime.Now; } } This is a contrived do-nothing example that simply echoes back what was passed in, but it demonstrates how you can pass complex data to a callback method. On the client side we now have a very simple form that captures the three values on a form: <fieldset> <legend>Post a Stock Buy Order</legend> Enter a symbol: <input type="text" name="txtBuySymbol" id="txtBuySymbol" value="GLD" />&nbsp;&nbsp; Qty: <input type="text" name="txtBuyQty" id="txtBuyQty" value="10" style="width: 50px" />&nbsp;&nbsp; Buy on: <input type="text" name="txtBuyOn" id="txtBuyOn" value="<%= DateTime.Now.ToString("d") %>" style="width: 70px;" /> <input type="button" id="btnBuyStock" value="Buy Stock" /> <div id="divStockBuyMessage" class="errordisplay" style="display:none"></div> </fieldset> The completed form and demo then looks something like this:   The client side code that picks up the input values and assigns them to object properties and sends the AJAX request looks like this: $("#btnBuyStock").click(function () { // create an object map that matches StockBuyOrder signature var buyOrder = { Symbol: $("#txtBuySymbol").val(), Quantity: $("#txtBuyQty").val() * 1, // number Entered: new Date() } ajaxCallMethod("SampleService.ashx", "BuyStock", [buyOrder], function (result) { $("#divStockBuyMessage").text(result).fadeIn(1000); }, onPageError); }); The code creates an object and attaches the properties that match the server side object passed to the BuyStock method. Each property that you want to update needs to be included and the type must match (ie. string, number, date in this case). Any missing properties will not be set but also not cause any errors. Pass POST data instead of Objects In the last example I collected a bunch of values from form variables and stuffed them into object variables in JavaScript code. While that works, often times this isn't really helping - I end up converting my types on the client and then doing another conversion on the server. If lots of input controls are on a page and you just want to pick up the values on the server via plain POST variables - that can be done too - and it makes sense especially if you're creating and filling the client side object only to push data to the server. Let's add another method to the server that once again lets us buy a stock. But this time let's not accept a parameter but rather send POST data to the server. Here's the server method receiving POST data: [CallbackMethod] public string BuyStockPost() { StockBuyOrder buyOrder = new StockBuyOrder(); buyOrder.Symbol = Request.Form["txtBuySymbol"]; ; int qty; int.TryParse(Request.Form["txtBuyQuantity"], out qty); buyOrder.Quantity = qty; DateTime time; DateTime.TryParse(Request.Form["txtBuyBuyOn"], out time); buyOrder.BuyOn = time; // Or easier way yet //FormVariableBinder.Unbind(buyOrder,null,"txtBuy"); var server = new StockServer(); var quote = server.GetStockQuote(buyOrder.Symbol); if (quote == null) throw new ApplicationException("Invalid or missing stock symbol."); return string.Format("You're buying {0} shares of {1} ({2}) stock at {3} for a total of {4} on {5}.", buyOrder.Quantity, quote.Company, quote.Symbol, quote.LastPrice.ToString("c"), (quote.LastPrice * buyOrder.Quantity).ToString("c"), buyOrder.BuyOn.ToString("MMM d")); } Clearly we've made this server method take more code than it did with the object parameter. We've basically moved the parameter assignment logic from the client to the server. As a result the client code to call this method is now a bit shorter since there's no client side shuffling of values from the controls to an object. $("#btnBuyStockPost").click(function () { ajaxCallMethod("SampleService.ashx", "BuyStockPost", [], // Note: No parameters - function (result) { $("#divStockBuyMessage").text(result).fadeIn(1000); }, onPageError, // Force all page Form Variables to be posted { postbackMode: "Post" }); }); The client simply calls the BuyStockQuote method and pushes all the form variables from the page up to the server which parses them instead. The feature that makes this work is one of the options you can pass to the ajaxCallMethod() function: { postbackMode: "Post" }); which directs the function to include form variable POST data when making the service call. Other options include PostNoViewState (for WebForms to strip out WebForms crap vars), PostParametersOnly (default), None. If you pass parameters those are always posted to the server except when None is set. The above code can be simplified a bit by using the FormVariableBinder helper, which can unbind form variables directly into an object: FormVariableBinder.Unbind(buyOrder,null,"txtBuy"); which replaces the manual Request.Form[] reading code. It receives the object to unbind into, a string of properties to skip, and an optional prefix which is stripped off form variables to match property names. The component is similar to the MVC model binder but it's independent of MVC. Returning non-JSON Data CallbackHandler also supports returning non-JSON/XML data via special return types. You can return raw non-JSON encoded strings like this: [CallbackMethod(ReturnAsRawString=true,ContentType="text/plain")] public string HelloWorldNoJSON(string name) { return "Hello " + name + ". Time is: " + DateTime.Now.ToString(); } Calling this method results in just a plain string - no JSON encoding with quotes around the result. This can be useful if your server handling code needs to return a string or HTML result that doesn't fit well for a page or other UI component. Any string output can be returned. You can also return binary data. Stream, byte[] and Bitmap/Image results are automatically streamed back to the client. Notice that you should set the ContentType of the request either on the CallbackMethod attribute or using Response.ContentType. This ensures the Web Server knows how to display your binary response. Using a stream response makes it possible to return any of data. Streamed data can be pretty handy to return bitmap data from a method. The following is a method that returns a stock history graph for a particular stock over a provided number of years: [CallbackMethod(ContentType="image/png",RouteUrl="stocks/history/graph/{symbol}/{years}")] public Stream GetStockHistoryGraph(string symbol, int years = 2,int width = 500, int height=350) { if (width == 0) width = 500; if (height == 0) height = 350; StockServer server = new StockServer(); return server.GetStockHistoryGraph(symbol,"Stock History for " + symbol,width,height,years); } I can now hook this up into the JavaScript code when I get a stock quote. At the end of the process I can assign the URL to the service that returns the image into the src property and so force the image to display. Here's the changed code: $("#btnStockQuote").click(function () { var symbol = $("#txtSymbol").val(); ajaxCallMethod("SampleService.ashx", "GetStockQuote", [symbol], function (quote) { $("#divStockDisplay").fadeIn(1000); $("#stockCompany").text(quote.Company + " (" + quote.Symbol + ")"); $("#stockLastPrice").text(quote.LastPrice); $("#stockQuoteTime").text(quote.LastQuoteTime.formatDate("MMM dd, hh:mmt")); // display a stock chart $("#imgStockHistory").attr("src", "stocks/history/graph/" + symbol + "/2"); },onPageError); }); The resulting output then looks like this: The charting code uses the new ASP.NET 4.0 Chart components via code to display a bar chart of the 2 year stock data as part of the StockServer class which you can find in the sample download. The ability to return arbitrary data from a service is useful as you can see - in this case the chart is clearly associated with the service and it's nice that the graph generation can happen off a handler rather than through a page. Images are common resources, but output can also be PDF reports, zip files for downloads etc. which is becoming increasingly more common to be returned from REST endpoints and other applications. Why reinvent? Obviously the examples I've shown here are pretty basic in terms of functionality. But I hope they demonstrate the core features of AJAX callbacks that you need to work through in most applications which is simple: return data, send back data and potentially retrieve data in various formats. While there are other solutions when it comes down to making AJAX callbacks and servicing REST like requests, I like the flexibility my home grown solution provides. Simply put it's still the easiest solution that I've found that addresses my common use cases: AJAX JSON RPC style callbacks Url based access XML and JSON Output from single method endpoint XML and JSON POST support, querystring input, routing parameter mapping UrlEncoded POST data support on callbacks Ability to return stream/raw string data Essentially ability to return ANYTHING from Service and pass anything All these features are available in various solutions but not together in one place. I've been using this code base for over 4 years now in a number of projects both for myself and commercial work and it's served me extremely well. Besides the AJAX functionality CallbackHandler provides, it's also an easy way to create any kind of output endpoint I need to create. Need to create a few simple routines that spit back some data, but don't want to create a Page or View or full blown handler for it? Create a CallbackHandler and add a method or multiple methods and you have your generic endpoints.  It's a quick and easy way to add small code pieces that are pretty efficient as they're running through a pretty small handler implementation. I can have this up and running in a couple of minutes literally without any setup and returning just about any kind of data. Resources Download the Sample NuGet: Westwind Web and AJAX Utilities (Westwind.Web) ajaxCallMethod() Documentation Using the AjaxMethodCallback WebForms Control West Wind Web Toolkit Home Page West Wind Web Toolkit Source Code © Rick Strahl, West Wind Technologies, 2005-2011Posted in ASP.NET  jQuery  AJAX   Tweet (function() { var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true; po.src = 'https://apis.google.com/js/plusone.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s); })();

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  • In Varnish stats, what does "Backend conn. reuses" and "recycles" mean?

    - by electblake
    I have varnish installed and I think it's working properly (not sure if it matters but I am using iptables reroute method to route ports incoming:80 > varnish:8080 > apache:80 Anyway, In varnishstat I see a pretty high Hitrate average (60-80%) which I am working on but I am unclear at what all of the stats presented by varnishstat Specifically the following Backend stats: 380 0.00 0.26 Backend conn. success 10122 15.00 6.85 Backend conn. reuses 267 0.00 0.18 Backend conn. was closed 10391 15.00 7.04 Backend conn. recycles I've read a blog post called "Varnishstat for dummies" which outlines a lot of details of varnishstat (I recommend it for beginners) but it does not go over these Backend stats. Feel free to explain here or link to a resource I've missed :) thanks!

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  • Static content not displayed with Zend FW

    - by shin
    I am trying to display a static content with Zend framework. When I go to http://square.localhost/content/services, I get an error message. Could anyone tell me how to fix this please? Thanks in advance. application.ini .... .... resources.layout.layoutPath = APPLICATION_PATH "/layouts" resources.layout.layout = "master" resources.router.routes.home.route = /home resources.router.routes.home.defaults.module = default resources.router.routes.home.defaults.controller = index resources.router.routes.home.defaults.action = index resources.router.routes.static-content.route = /content/:page resources.router.routes.static-content.defaults.module = default resources.router.routes.static-content.defaults.controller = static-content resources.router.routes.static-content.defaults.action = display application/modules/default/controllers/StaticContentController.php class StaticContentController extends Zend_Controller_Action { public function init() { } // display static views public function displayAction() { $page = $this->getRequest()->getParam('page'); if (file_exists($this->view->getScriptPath(null) . "/" . $this->getRequest()->getControllerName() . "/$page." . $this->viewSuffix)) { $this->render($page); } else { throw new Zend_Controller_Action_Exception('Page not found', 404); } } } application/modules/default/views/scripts/static-content/services.phtml some html ... ... Error message An error occurred Page not found Exception information: Message: Page not found Stack trace: #0 /var/www/square/library/Zend/Controller/Action.php(513): StaticContentController->displayAction() #1 /var/www/square/library/Zend/Controller/Dispatcher/Standard.php(295): Zend_Controller_Action->dispatch('displayAction') #2 /var/www/square/library/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http)) #3 /var/www/square/library/Zend/Application/Bootstrap/Bootstrap.php(97): Zend_Controller_Front->dispatch() #4 /var/www/square/library/Zend/Application.php(366): Zend_Application_Bootstrap_Bootstrap->run() #5 /var/www/square/public/index.php(26): Zend_Application->run() #6 {main} Request Parameters: array ( 'page' => 'services', 'module' => 'default', 'controller' => 'static-content', 'action' => 'display', )

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  • How to force my method to accept objects from external software?

    - by Roman
    I have a method which needs to take a callback object as an argument and then (at the moment when it's needed) my method will call a specific method of the callback object. I wrote a class called Manager which has a method called addListener. As the argument for this method I need to use a callback object which is defined by the external software. So, I define the addListener in the following way: public void addListener(Listener listener). Of course Eclipse complains because it does not know what Listener is (because the Listener is defined by the external software). The only think that I know (should know) about the Listener is that it has a method called doSomething. So, to pleasure Eclipse I add an interface before my Manager class: interface Listener { void doSomething(); } public class CTManager { ... The problem seems to be solved but then I try to test my software. So, I create a class called test. In this class I create an instance of the Manager class and try to use addListener method of this instance. I also create a class Listener, instantiate it and give the instance to the addListener. And it's the place where the problem appears. Eclipse writes that addListener is not applicable to the given argument. I think it's because it expect something from my Listenr interface but gets something from the Listener class. How can I solve this problem?

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  • How to send KeyEvents through an input method service to a Dialog, or a Spinner menu?

    - by shutdown11
    I'm trying to implement an input method service that receives intents sent by a remote client, and in response to those sends an appropriate KeyEvent. I'm using in the input method service this method private void keyDownUp(int keyEventCode) { getCurrentInputConnection().sendKeyEvent( new KeyEvent(KeyEvent.ACTION_DOWN, keyEventCode)); getCurrentInputConnection().sendKeyEvent( new KeyEvent(KeyEvent.ACTION_UP, keyEventCode)); } to send KeyEvents as in the Simple Sofykeyboard Sample, and it works in the home, in Activities... but it doesn't works when a Dialog or the menu of a Spinner is in foreground. The events is sent to the parent activity behind the Dialog. Is there any way to send keys and control the device like using the hardware keys from an input method? Better explanation on what I'm trying to do: I am kind of writng an Input Method that allows to control the device from remote. I write in a client (a java application on my desktop pc) a command (for example "UP"), a server on the device with sendBroadcast() sends the intent with the information, and a receiver in the input method gets it and call keyDownUp with the keycode of the DPAD_UP key. It generally works, but when I go to an app that shows a dialog, the keyDownUp method don't sends the key event to the dialog, for example for select the yes or not buttons, but it keeps to control the activty behind the Dialog.

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  • Hover text at mouse created from firefox toolbar add-on

    - by c-square
    Hi all, I'm creating a firefox add-on, and I have a situation where if someone clicks on a specific item in my toolbarbutton menupopup, I want to display some text to appear beside the mouse for a couple seconds. I don't mean mouseover text, because when they click on the item, the I close the menupopup. I mean something like what's shown at this site: http://www.kingsquare.nl/cursormessage The normal way of doing this would be with javascript and a div that would have the text I want to show. Unfortunately, I've discovered that the toolbarbutton can't have an effect on the main window, which is where I'd need to place the div to show. I've tried getting JQuery to work and haven't been successful either. Any help would be greatly appreciated. Thanks!

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  • What does it mean for an OS to "execute within user processes"? Do any modern OS's use that approach

    - by Chris Cooper
    I have recently become interested in operating system, and a friend of mine lent me a book called Operating Systems: Internals and Design Principles (I have the third edition), published in 1998. It's been a very interesting book so far, but I have come to the part dealing with process control, and it's using UNIX System V as one of its examples of an operating system that executes within user processes. This concept has struck me as a little strange. First of all, does this mean that OS instructions and data are stored in each user of the processes? Probably not, because that would be an absurdly redundant scheme. But if not, then what does it mean to "execute within" a user process? Do any modern operating systems use this approach? It seems much more logical to have the operating system execute as its own process, or even independently of all processes, if you're short on memory. All the inter-accessiblilty of process data required for this layout seems to greatly complicate things. (But maybe that's just because I don't quite get the concept ;D) Here is what the book says: "Execution within User Processes: An alternative that is common with operation systems on smaller machines is to execute virtually all operating system software in the context of a user process. ... "

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  • What do the 'size' numbers mean in the windbg !heap output?

    - by pj4533
    I see output like this in my DMP file: Heap entries for Segment00 in Heap 00150000 00150640: 00640 . 00040 [01] - busy (40) 00150680: 00040 . 01808 [01] - busy (1800) 00151e88: 01808 . 00210 [01] - busy (208) 00152098: 00210 . 00228 [00] 001522c0: 00228 . 00030 [01] - busy (22) 001522f0: 00030 . 00018 [01] - busy (10) 00152308: 00018 . 00048 [01] - busy (3c) The WinDbg docs say this: Heap entries for Segment00 in Heap 250000 0x01 - HEAP_ENTRY_BUSY 0x02 - HEAP_ENTRY_EXTRA_PRESENT 0x04 - HEAP_ENTRY_FILL_PATTERN 0x08 - HEAP_ENTRY_VIRTUAL_ALLOC 0x10 - HEAP_ENTRY_LAST_ENTRY 0x20 - HEAP_ENTRY_SETTABLE_FLAG1 0x40 - HEAP_ENTRY_SETTABLE_FLAG2 Entry Prev Cur 0x80 - HEAP_ENTRY_SETTABLE_FLAG3 Address Size Size flags (Bytes used) (Tag name) 00250000: 00000 . 00b90 [01] - busy (b90) 00250b90: 00b90 . 00038 [01] - busy (38) 00250bc8: 00038 . 00040 [07] - busy (24), tail fill (NTDLL!LDR Database) The spacing is weird in the docs though. Does that mean 'entry address' and 'prev size' and 'cur size', or are the 'entry' 'prev' and 'cur' not for the line below? What does 'prev size' and 'cur size' mean? Especially with regard to 'bytes used'. What is the difference between 'bytes used' and 'cur size'?

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  • What different terms mean the same thing (or don't, but people think they do)?

    - by Matthew Jones
    One of the pitfalls I run into on a daily basis is customers saying one thing while meaning another. Usually, this is just due to a miscommunication somewhere, but occasionally they are, in fact, saying the same thing I am just using a different term. For example, one of my customers the other day mentioned a feature he called, "find as you type." Being a little confused, I asked him what he meant, and he described the feature in Google where, once you start typing a search query, Google suggests other, popular queries that match the letters you have typed. Click! He meant AutoComplete! He was not wrong, it is just that I had never heard that term before. In the spirit of reducing confusion, what terms can you think of that are different but mean, essentially, the same thing? Also, what terms do people think mean the same thing, but don't. Please differentiate between the two. Please only one set of terms per answer, so we can vote on the best ones.

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  • Using the jQuery UI Library in a MVC 3 Application to Build a Dialog Form

    - by ChrisD
    Using a simulated dialog window is a nice way to handle inline data editing. The jQuery UI has a UI widget for a dialog window that makes it easy to get up and running with it in your application. With the release of ASP.NET MVC 3, Microsoft included the jQuery UI scripts and files in the MVC 3 project templates for Visual Studio. With the release of the MVC 3 Tools Update, Microsoft implemented the inclusion of those with NuGet as packages. That means we can get up and running using the latest version of the jQuery UI with minimal effort. To the code! Another that might interested you about JQuery Mobile and ASP.NET MVC 3 with C#. If you are starting with a new MVC 3 application and have the Tools Update then you are a NuGet update and a <link> and <script> tag away from adding the jQuery UI to your project. If you are using an existing MVC project you can still get the jQuery UI library added to your project via NuGet and then add the link and script tags. Assuming that you have pulled down the latest version (at the time of this publish it was 1.8.13) you can add the following link and script tags to your <head> tag: < link href = "@Url.Content(" ~ / Content / themes / base / jquery . ui . all . css ")" rel = "Stylesheet" type = "text/css" /> < script src = "@Url.Content(" ~ / Scripts / jquery-ui-1 . 8 . 13 . min . js ")" type = "text/javascript" ></ script > The jQuery UI library relies upon the CSS scripts and some image files to handle rendering of its widgets (you can choose a different theme or role your own if you like). Adding these to the stock _Layout.cshtml file results in the following markup: <!DOCTYPE html> < html > < head >     < meta charset = "utf-8" />     < title > @ViewBag.Title </ title >     < link href = "@Url.Content(" ~ / Content / Site . css ")" rel = "stylesheet" type = "text/css" />     <link href="@Url.Content("~/Content/themes/base/jquery.ui.all.css")" rel="Stylesheet" type="text/css" />     <script src="@Url.Content("~/Scripts/jquery-1.5.1.min.js")" type="text/javascript"></script>     <script src="@Url.Content("~/Scripts/modernizr-1.7.min . js ")" type = "text/javascript" ></ script >     < script src = "@Url.Content(" ~ / Scripts / jquery-ui-1 . 8 . 13 . min . js ")" type = "text/javascript" ></ script > </ head > < body >     @RenderBody() </ body > </ html > Our example will involve building a list of notes with an id, title and description. Each note can be edited and new notes can be added. The user will never have to leave the single page of notes to manage the note data. The add and edit forms will be delivered in a jQuery UI dialog widget and the note list content will get reloaded via an AJAX call after each change to the list. To begin, we need to craft a model and a data management class. We will do this so we can simulate data storage and get a feel for the workflow of the user experience. The first class named Note will have properties to represent our data model. namespace Website . Models {     public class Note     {         public int Id { get ; set ; }         public string Title { get ; set ; }         public string Body { get ; set ; }     } } The second class named NoteManager will be used to set up our simulated data storage and provide methods for querying and updating the data. We will take a look at the class content as a whole and then walk through each method after. using System . Collections . ObjectModel ; using System . Linq ; using System . Web ; namespace Website . Models {     public class NoteManager     {         public Collection < Note > Notes         {             get             {                 if ( HttpRuntime . Cache [ "Notes" ] == null )                     this . loadInitialData ();                 return ( Collection < Note >) HttpRuntime . Cache [ "Notes" ];             }         }         private void loadInitialData ()         {             var notes = new Collection < Note >();             notes . Add ( new Note                           {                               Id = 1 ,                               Title = "Set DVR for Sunday" ,                               Body = "Don't forget to record Game of Thrones!"                           });             notes . Add ( new Note                           {                               Id = 2 ,                               Title = "Read MVC article" ,                               Body = "Check out the new iwantmymvc.com post"                           });             notes . Add ( new Note                           {                               Id = 3 ,                               Title = "Pick up kid" ,                               Body = "Daughter out of school at 1:30pm on Thursday. Don't forget!"                           });             notes . Add ( new Note                           {                               Id = 4 ,                               Title = "Paint" ,                               Body = "Finish the 2nd coat in the bathroom"                           });             HttpRuntime . Cache [ "Notes" ] = notes ;         }         public Collection < Note > GetAll ()         {             return Notes ;         }         public Note GetById ( int id )         {             return Notes . Where ( i => i . Id == id ). FirstOrDefault ();         }         public int Save ( Note item )         {             if ( item . Id <= 0 )                 return saveAsNew ( item );             var existingNote = Notes . Where ( i => i . Id == item . Id ). FirstOrDefault ();             existingNote . Title = item . Title ;             existingNote . Body = item . Body ;             return existingNote . Id ;         }         private int saveAsNew ( Note item )         {             item . Id = Notes . Count + 1 ;             Notes . Add ( item );             return item . Id ;         }     } } The class has a property named Notes that is read only and handles instantiating a collection of Note objects in the runtime cache if it doesn't exist, and then returns the collection from the cache. This property is there to give us a simulated storage so that we didn't have to add a full blown database (beyond the scope of this post). The private method loadInitialData handles pre-filling the collection of Note objects with some initial data and stuffs them into the cache. Both of these chunks of code would be refactored out with a move to a real means of data storage. The GetAll and GetById methods access our simulated data storage to return all of our notes or a specific note by id. The Save method takes in a Note object, checks to see if it has an Id less than or equal to zero (we assume that an Id that is not greater than zero represents a note that is new) and if so, calls the private method saveAsNew . If the Note item sent in has an Id , the code finds that Note in the simulated storage, updates the Title and Description , and returns the Id value. The saveAsNew method sets the Id , adds it to the simulated storage, and returns the Id value. The increment of the Id is simulated here by getting the current count of the note collection and adding 1 to it. The setting of the Id is the only other chunk of code that would be refactored out when moving to a different data storage approach. With our model and data manager code in place we can turn our attention to the controller and views. We can do all of our work in a single controller. If we use a HomeController , we can add an action method named Index that will return our main view. An action method named List will get all of our Note objects from our manager and return a partial view. We will use some jQuery to make an AJAX call to that action method and update our main view with the partial view content returned. Since the jQuery AJAX call will cache the call to the content in Internet Explorer by default (a setting in jQuery), we will decorate the List, Create and Edit action methods with the OutputCache attribute and a duration of 0. This will send the no-cache flag back in the header of the content to the browser and jQuery will pick that up and not cache the AJAX call. The Create action method instantiates a new Note model object and returns a partial view, specifying the NoteForm.cshtml view file and passing in the model. The NoteForm view is used for the add and edit functionality. The Edit action method takes in the Id of the note to be edited, loads the Note model object based on that Id , and does the same return of the partial view as the Create method. The Save method takes in the posted Note object and sends it to the manager to save. It is decorated with the HttpPost attribute to ensure that it will only be available via a POST. It returns a Json object with a property named Success that can be used by the UX to verify everything went well (we won't use that in our example). Both the add and edit actions in the UX will post to the Save action method, allowing us to reduce the amount of unique jQuery we need to write in our view. The contents of the HomeController.cs file: using System . Web . Mvc ; using Website . Models ; namespace Website . Controllers {     public class HomeController : Controller     {         public ActionResult Index ()         {             return View ();         }         [ OutputCache ( Duration = 0 )]         public ActionResult List ()         {             var manager = new NoteManager ();             var model = manager . GetAll ();             return PartialView ( model );         }         [ OutputCache ( Duration = 0 )]         public ActionResult Create ()         {             var model = new Note ();             return PartialView ( "NoteForm" , model );         }         [ OutputCache ( Duration = 0 )]         public ActionResult Edit ( int id )         {             var manager = new NoteManager ();             var model = manager . GetById ( id );             return PartialView ( "NoteForm" , model );         }         [ HttpPost ]         public JsonResult Save ( Note note )         {             var manager = new NoteManager ();             var noteId = manager . Save ( note );             return Json ( new { Success = noteId > 0 });         }     } } The view for the note form, NoteForm.cshtml , looks like so: @model Website . Models . Note @using ( Html . BeginForm ( "Save" , "Home" , FormMethod . Post , new { id = "NoteForm" })) { @Html . Hidden ( "Id" ) < label class = "Title" >     < span > Title < /span><br / >     @Html . TextBox ( "Title" ) < /label> <label class="Body">     <span>Body</ span >< br />     @Html . TextArea ( "Body" ) < /label> } It is a strongly typed view for our Note model class. We give the <form> element an id attribute so that we can reference it via jQuery. The <label> and <span> tags give our UX some structure that we can style with some CSS. The List.cshtml view is used to render out a <ul> element with all of our notes. @model IEnumerable < Website . Models . Note > < ul class = "NotesList" >     @foreach ( var note in Model )     {     < li >         @note . Title < br />         @note . Body < br />         < span class = "EditLink ButtonLink" noteid = "@note.Id" > Edit < /span>     </ li >     } < /ul> This view is strongly typed as well. It includes a <span> tag that we will use as an edit button. We add a custom attribute named noteid to the <span> tag that we can use in our jQuery to identify the Id of the note object we want to edit. The view, Index.cshtml , contains a bit of html block structure and all of our jQuery logic code. @ {     ViewBag . Title = "Index" ; } < h2 > Notes < /h2> <div id="NoteListBlock"></ div > < span class = "AddLink ButtonLink" > Add New Note < /span> <div id="NoteDialog" title="" class="Hidden"></ div > < script type = "text/javascript" >     $ ( function () {         $ ( "#NoteDialog" ). dialog ({             autoOpen : false , width : 400 , height : 330 , modal : true ,             buttons : {                 "Save" : function () {                     $ . post ( "/Home/Save" ,                         $ ( "#NoteForm" ). serialize (),                         function () {                             $ ( "#NoteDialog" ). dialog ( "close" );                             LoadList ();                         });                 },                 Cancel : function () { $ ( this ). dialog ( "close" ); }             }         });         $ ( ".EditLink" ). live ( "click" , function () {             var id = $ ( this ). attr ( "noteid" );             $ ( "#NoteDialog" ). html ( "" )                 . dialog ( "option" , "title" , "Edit Note" )                 . load ( "/Home/Edit/" + id , function () { $ ( "#NoteDialog" ). dialog ( "open" ); });         });         $ ( ".AddLink" ). click ( function () {             $ ( "#NoteDialog" ). html ( "" )                 . dialog ( "option" , "title" , "Add Note" )                 . load ( "/Home/Create" , function () { $ ( "#NoteDialog" ). dialog ( "open" ); });         });         LoadList ();     });     function LoadList () {         $ ( "#NoteListBlock" ). load ( "/Home/List" );     } < /script> The <div> tag with the id attribute of "NoteListBlock" is used as a container target for the load of the partial view content of our List action method. It starts out empty and will get loaded with content via jQuery once the DOM is loaded. The <div> tag with the id attribute of "NoteDialog" is the element for our dialog widget. The jQuery UI library will use the title attribute for the text in the dialog widget top header bar. We start out with it empty here and will dynamically change the text via jQuery based on the request to either add or edit a note. This <div> tag is given a CSS class named "Hidden" that will set the display:none style on the element. Since our call to the jQuery UI method to make the element a dialog widget will occur in the jQuery document ready code block, the end user will see the <div> element rendered in their browser as the page renders and then it will hide after that jQuery call. Adding the display:hidden to the <div> element via CSS will ensure that it is never rendered until the user triggers the request to open the dialog. The jQuery document load block contains the setup for the dialog node, click event bindings for the edit and add links, and a call to a JavaScript function called LoadList that handles the AJAX call to the List action method. The .dialog() method is called on the "NoteDialog" <div> element and the options are set for the dialog widget. The buttons option defines 2 buttons and their click actions. The first is the "Save" button (the text in quotations is used as the text for the button) that will do an AJAX post to our Save action method and send the serialized form data from the note form (targeted with the id attribute "NoteForm"). Upon completion it will close the dialog widget and call the LoadList to update the UX without a redirect. The "Cancel" button simply closes the dialog widget. The .live() method handles binding a function to the "click" event on all elements with the CSS class named EditLink . We use the .live() method because it will catch and bind our function to elements even as the DOM changes. Since we will be constantly changing the note list as we add and edit we want to ensure that the edit links get wired up with click events. The function for the click event on the edit links gets the noteid attribute and stores it in a local variable. Then it clears out the HTML in the dialog element (to ensure a fresh start), calls the .dialog() method and sets the "title" option (this sets the title attribute value), and then calls the .load() AJAX method to hit our Edit action method and inject the returned content into the "NoteDialog" <div> element. Once the .load() method is complete it opens the dialog widget. The click event binding for the add link is similar to the edit, only we don't need to get the id value and we load the Create action method. This binding is done via the .click() method because it will only be bound on the initial load of the page. The add button will always exist. Finally, we toss in some CSS in the Content/Site.css file to style our form and the add/edit links. . ButtonLink { color : Blue ; cursor : pointer ; } . ButtonLink : hover { text - decoration : underline ; } . Hidden { display : none ; } #NoteForm label { display:block; margin-bottom:6px; } #NoteForm label > span { font-weight:bold; } #NoteForm input[type=text] { width:350px; } #NoteForm textarea { width:350px; height:80px; } With all of our code in place we can do an F5 and see our list of notes: If we click on an edit link we will get the dialog widget with the correct note data loaded: And if we click on the add new note link we will get the dialog widget with the empty form: The end result of our solution tree for our sample:

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  • Accessing non-static combbox property in the static method.

    - by Harikrishna
    I have one combobox on the window form and I have one method which is declared with static like private static DataTable ParseTable(HtmlNode table) Now I want to use combobox in that method for using combobox property but I can not access any property of combobox or combobox itself.If I made the combobox declaration as static then it can be accessed in that static method.But any alternative way to access combbox property in that static method because I don't want to make combobox declaration as static.

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  • How do I unit test the methods in a method object?

    - by Sancho
    I've performed the "Replace Method with Method Object" refactoring described by Beck. Now, I have a class with a "run()" method and a bunch of member functions that decompose the computation into smaller units. How do I test those member functions? My first idea is that my unit tests be basically copies of the "run()" method (with different initializations), but with assertions between each call to the member functions to check the state of the computation. (I'm using Python and the unittest module.)

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  • How can I check if an object has a specific method?

    - by Ghommey
    I want to use a method of an object. Like $myObject->helloWorld(). However there are a couple of methods so I loop through an array of method names and call the method like this: my $methodName ="helloWorld"; $myObject->$methodNames; This works quite nice but some objects don't have all methods. How can I tell whether $myObject has a method called helloWorld or not?

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  • Create a thread in xna Update method to find path?

    - by Dan
    I am trying to create a separate thread for my enemy's A* pathfinder which will give me a list of points to get to the player. I have placed the thread in the update method of my enemy. However this seems to cause jittering in the game every-time the thread is called. I have tried calling just the method and this works fine. Is there any way I can sort this out so that I can have the pathfinder on its own thread? Do I need to remove the thread start from the update and start it in the constructor? Is there any way this can work. Here is the code at the moment: bool running = false; bool threadstarted; System.Threading.Thread thread; public void update() { if (running == false && threadstarted == false) { thread = new System.Threading.Thread(PathThread); //thread.Priority = System.Threading.ThreadPriority.Lowest; thread.IsBackground = true; thread.Start(startandendobj); //PathThread(startandendobj); threadstarted = true; } } public void PathThread(object Startandend) { object[] Startandendarray = (object[])Startandend; Point startpoint = (Point)Startandendarray[0]; Point endpoint = (Point)Startandendarray[1]; bool runnable = true; // Path find from 255, 255 to 0,0 on the map foreach(Tile tile in Map) { if(tile.Color == Color.Red) { if (tile.Position.Contains(endpoint)) { runnable = false; } } } if(runnable == true) { running = true; Pathfinder p = new Pathfinder(Map); pathway = p.FindPath(startpoint, endpoint); running = false; threadstarted = false; } }

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  • Should static parameters in an API be part of each method?

    - by jschoen
    I am currently creating a library that is a wrapper for an online API. The obvious end goal is to make it as easy for others to use as possible. As such I am trying to determine the best approach when it comes to common parameters for the API. In my current situation there are 3 (consumer key, consumer secret, and and authorization token). They are essentially needed in every API call. My question is should I make these 3 parameters required for each method or is there a better way. I see my current options as being: Place the parameters in each method call public ApiObject callMethod(String consumerKey, String consumerSecret, String token, ...) This one seems reasonable, but seems awfully repetitive to me. Create a singleton class that the user must initialize before calling any api methods. This seems wrong, and would essentially limit them to accessing one account at a time via the API (which may be reasonable, I dunno). Make them place them in a properties file in their project. That way I can load the properties that way and store them. This seems similar to the singleton to me, but they would not have to explicitly call something to initialize these values. Is there another option I am not seeing, or a more common practice in this situation that I should be following?

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  • How and what should I be (unit) testing for in this method?

    - by user460667
    I am relatively new to unit testing and have a query about what/how I should be testing a certain method. For the following (psudo-c#) method I have created (not a real-life example) what would you test for? Initially, my thoughts would be to test the output with variations on the dictionary of form fields, e.g. valid, invalid, missing values. However I also wonder how you would test to make sure the object values have been changed to the correct value and that the correct email message was attempted to be sent (obviously both services could/would be mocked). I hope what I am asking makes sense, I appreciate this is a subjective question and the answers may be 'it depends' ;) public bool ProcessInput(Dictionary<string, string> formFields, ObjService objService, EmailService emailService) { try { // Get my object id int objId; if(!int.TryParse(formField["objId"], out objId) { return false; } // Update my object - would you validate the save against a DB or a mocked inmemory db? var myObj = objService.Find(objId); myObj.Name = formField["objName"]; objService.Save(myObj); // Send an email - how would you test to make sure content, recipient, etc was correct? emailService.SendEmail(formField("email"), "Hello World"); return true; } catch(Exception ex) { return false; } }

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  • Is the php method md5() secure? Can it be used for passwords? [migrated]

    - by awiebe
    So executing a php script causes the form values to be sent to the server, and then they are processed. If you want to store a password in your db than you want it to be a cryptographic hash(so your client side is secure, can you generate an md5 using php securely( without submitting the user:password pair in the clear), or is there an alternative standard method of doing this, without having the unecrypted pasword leaving the clients machine? Sorry if this is a stupid question I'm kind of new at this. I think this can be done somehow using https, and on that note if a site's login page does not use https, does that mean that while the databse storage is secure, the transportation is not?

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  • What does it mean to "preconcat" a matrix in Android?

    - by Brad Hein
    In reviewing: http://developer.android.com/reference/android/graphics/Canvas.html I'm wondering translate(): "preconcat the current matrix with the specified translation" -- what does this mean? I can't find a good definition of "preconcat" anywhere on the internet! The only place I can find it is in the Android Source - I'm starting to wonder if they made it up? :) I'm familiar with "concat" or concatenate, which is to append to, so what is a pre-concat?

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