What am I doing wrong?

[NJDude]

This is the situation, I'm working on a routine to take pictures (camera) and I'm using the "CameraPortrait 1.10" library since it allows the camera to "work" in portrait mode, however, when you take a picture the image is rotated 90 degrees, so, I'm attemping to write a routine that will rotate it 90 degrees and save it.

The code below is the one to snap the picture, it works without a problem (this code is the sample code posted on the tutorial)

Sub Camera1_PictureTaken (Data() As Byte)
            
    Dim Out As OutputStream

    Out = File.OpenOutput(File.DirRootExternal, "/media/Snapshot.jpg", False)
    Out.WriteBytes(Data, 0, Data.Length)
    Out.Close

End Sub

This following code is my attempt to rotate it and save it, but, it works sometimes, when it fails the phone force closes the app.

Sub FlipButton_Click

    Dim Out As OutputStream
    Dim Canvas1 As Canvas
    Dim Bitmap1 As Bitmap
    Dim DestRect As Rect
            
    Canvas1.Initialize(PicTaken)  ' <---- PicTaken is an ImageView on my layout

    Bitmap1.Initialize(File.DirRootExternal, "/media/Snapshot.jpg")
            
    DestRect.Initialize(0dip, 0dip, 320dip, 320dip)
            
    Canvas1.DrawBitmapRotated(Bitmap1, Null, DestRect, 90)   
            
    Out = File.OpenOutput(File.DirRootExternal, "/media/Snapshot.jpg", False)
    Canvas1.Bitmap.WriteToStream(Out, 75, "JPEG")
    Out.Close
   
End Sub

I know I'm doing something wrong but I can't figure out what since I'm still green on B4A.

Thanks

 

[XverhelstX]

i'm not sure, but it might be related to this.

Canvas1.Initialize(PicTaken)

try something like

dim ImageView1 as ImageView
Canvas1.Initialize(ImageView1)

XverhelstX

oh nevermind you just edited your post

 

[klaus]

Try to replace

Canvas1.Bitmap.WriteToStream(Out, 75, "JPEG")

by

PicTaken.Bitmap.WriteToStream(Out, 75, "JPEG")

Best regards.

 

[NJDude]

hi Klaus,

I did what you suggested and this is what I get at compiling time:

Compiling code.                         Error
Error compiling program.
Error description: Unknown member: writetostream
Occurred on line: 151
PicTaken.Bitmap.WriteToStream(Out, 75, "JPEG")
Word: writetostream

 

[Erel]

When your application is "forced closed" then you should get an error message in the unfiltered log tab (in the right pane). This message may be helpful.

Try to save the bitmap to a different file.

 

[NJDude]

Erel,

The error seems to be "Null pointer error" this is a portion of the error log

main_camera1_picturetaken (java line: 224)
java.lang.NullPointerException
   at com.CameraTest.main._camera1_picturetaken(main.java:224)
   at java.lang.reflect.Method.invokeNative(Native Method)
   at java.lang.reflect.Method.invoke(Method.java:521)
   at anywheresoftware.b4a.BA.raiseEvent2(BA.java:99)
   at anywheresoftware.b4a.BA.raiseEvent2(BA.java:89)
   at anywheresoftware.b4a.BA.raiseEvent(BA.java:85)
   at anywheresoftware.b4a.objects.CamRotate$3.onPictureTaken(CamRotate.java:143)
   at android.hardware.Camera$EventHandler.handleMessage(Camera.java:328)
   at android.os.Handler.dispatchMessage(Handler.java:99)
   at android.os.Looper.loop(Looper.java:144)
   at android.app.ActivityThread.main(ActivityThread.java:4937)
   at java.lang.reflect.Method.invokeNative(Native Method)
   at java.lang.reflect.Method.invoke(Method.java:521)
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
   at dalvik.system.NativeStart.main(Native Method)
java.lang.NullPointerException

It occurs regarless of changing the name of the file to be saved.

 

[Erel]

Can you upload your project (choose File - Export as zip)?

 

[NJDude]

Ok here it is.

To use it, AFTER a picture is taken the SEND button needs to be tapped (this is to isolate the rotating routine) you will see that maybe the 1st rotation works, the second will fail displaying an error.

Thanks

 

[Erel]

I'm not getting any errors. However the camera orientation doesn't seem to work properly.

 

[NJDude]

I'm not getting any errors. However the camera orientation doesn't seem to work properly.

That's very strange, I've tried that code on 2 different phones and on both the code fails when I hit the SEND button (rotate routine).


Anyway, thanks for checking it out.

 

[TrisectDevelopment]

Well I dont get an error but it does also not rotate on my phone.
And I really could use a rotate function.