How to get the pixels data in certain rectangle of the screen?

wxPython Users
1

I use wx.DC’s GetAsBitmap method. Here is my code:

sdc = wx.ScreenDC()

rect = wx.Rect(0, 0, 100, 100)

bmp = sdc.GetAsBitmap( rect )

However, the compiler prompt error:

wx._core.PyAssertionError: C++ assertion “Ok() && (rect.x >= 0) && (rect.y >= 0) && (rect.x+rect.width <= GetWidth()) && (rect.y+rect.height <= GetHeight())” failed at …\src\msw\bitmap.cpp(1089) in wxBitmap::GetSubBitmapOfHDC(): Invalid bitmap or bitmap region

So how can I do this ? Thank you~

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Dae James

2

Try using Blit to copy from the screen dc to a memory dc with the bitmap selected into it.

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On 10/17/12 12:04 AM, Dae James wrote:

I use wx.DC's GetAsBitmap method. Here is my code:
         sdc = wx.ScreenDC()
         rect = wx.Rect(0, 0, 100, 100)
         bmp = sdc.GetAsBitmap( rect )
However, the compiler prompt error:
  wx._core.PyAssertionError: C++ assertion "Ok() && (rect.x >= 0) && (rect.y >= 0) && (rect.x+rect.width <= GetWidth()) && (rect.y+rect.height <= GetHeight())" failed at ..\..\src\msw\bitmap.cpp(1089) in wxBitmap::GetSubBitmapOfHDC(): Invalid bitmap or bitmap region
So how can I do this ?

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Robin Dunn
Software Craftsman