Android Question i'm getting this error when i press the button

[Sadk]

Sub Button1_Click
    Private b As Bitmap
    b=LoadBitmap(File.DirAssets, "Untikktled.jpg")
    Dim i As Long
    Dim j As Long
    Dim s  As String
   

    s=""

    For i=0 To b.Height
        For j=0 To b.Width
           
            [COLOR=rgb(226, 80, 65)]If b.GetPixel(j,i)=Colors.White Then[/COLOR]
                s=s & "0"
           
            Else
                s=s & "1"
            End If
           
        Next
    Next
   
End Sub

Error occurred on line: 69 (Main)
java.lang.IllegalArgumentException: x must be < bitmap.width()
    at android.graphics.Bitmap.checkPixelAccess(Bitmap.java:1960)
    at android.graphics.Bitmap.getPixel(Bitmap.java:1863)
    at anywheresoftware.b4a.objects.drawable.CanvasWrapper$BitmapWrapper.GetPixel(CanvasWrapper.java:661)
    at b4a.example.main._button1_click(main.java:475)
    at java.lang.reflect.Method.invoke(Native Method)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:732)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:348)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:255)
    at java.lang.reflect.Method.invoke(Native Method)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:144)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:197)
    at anywheresoftware.b4a.BA.raiseEvent(BA.java:193)
    at anywheresoftware.b4a.objects.ViewWrapper$1.onClick(ViewWrapper.java:80)
    at android.view.View.performClick(View.java:7300)
    at android.view.View.performClickInternal(View.java:7277)
    at android.view.View.access$3600(View.java:822)
    at android.view.View$PerformClick.run(View.java:28027)
    at android.os.Handler.handleCallback(Handler.java:883)
    at android.os.Handler.dispatchMessage(Handler.java:100)
    at android.os.Looper.loop(Looper.java:224)
    at android.app.ActivityThread.main(ActivityThread.java:7565)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)

 

[Alexander Stolte]

try this:

b.GetPixel(Min(j,B4XCollections.width),i)

 

[Sadk]

try this:

b.GetPixel(Min(j,B4XCollections.width),i)

 

[klaus]

Use:

    For i=0 To b.Height - 1
        For j=0 To b.Width - 1

 

[Erel]

BTW, Bitmap.GetPixel is only useful when you want to get the color values of few pixels. Use BitmapCreator to get all values. It will be 1000 times faster.

 

[Sadk]

BTW, Bitmap.GetPixel is only useful when you want to get the color values of few pixels. Use BitmapCreator to get all values. It will be 1000 times faster.

the error is gone ,but nothing appears in the editbox

 

[Sadk]

Use:

    For i=0 To b.Height - 1
        For j=0 To b.Width - 1

the error is gone ,but nothing appears in the editbox

 

[klaus]

What exactly do you want to do ?
You need to give more detailed information on:
What do you want to do?
What result do you expect?
etc.
In the code in the first post you try to modify an image, but you do nothing else with it.
Then you speak about an editbox, how is all this related.
Post your test project as zip file, this would be the best way for us to help you.
How to zip a project from within the IDE:

 

[Sadk]

What exactly do you want to do ?

when you click on the button a massage appears b4a not responding (waiting/ok) , convert the image to binary dose not appear on the edit box

 

[klaus]

Sorry, but I still do not understand what you really want to do.
First your layout is not OK, at least for my device, views are out of the screen.
You use the click event of the EditText view, is this what you want to do?
Then you create a string in the converting routine but you do nothing with it.
You need to set this string to the Text property of the EditText view.
Be aware that the number of characters of the string is 255 * 255 = 65025 characters !?
What do you want to do with this.
You compare pixels from the BitmapCreator object "b" but you set the image to bmcRose, why?
In your original project, all pixels in b are transparent.

Attached my test version of your project.
For testing I reduced the loop.

 

[Sadk]

Sorry, but I still do not understand what you really want to do.

i mean that, and the attached you sent are picking up some and it's a logical result , mabye it need a process before it in order to catchh the full