stretchblt_stretchblt CImage_stretchblt 失败(2)

int width = bmp.Width;

int height = bmp.Height;

//save to c drive (just to insure image was correctly read)

bmp.Save("c:\\savetest3.bmp", System.Drawing.Imaging.ImageFormat.Bmp);

//create Graphic from source bitmap

//I think my problem is in this line - maybe not creating a compatable handle???

Graphics bmpGraphic = Graphics.FromImage(bmp);

//because (when uncommented) the following line works for coping a block from the form???

//Graphics bmpGraphic = this.CreateGraphics();

//get handle to source graphic

IntPtr srcHdc = bmpGraphic.GetHdc();

//create Graphic from picture box

Graphics dest1Pic = picBoxScroll.CreateGraphics();

//get handle to destination graphic

IntPtr destHDC = dest1Pic.GetHdc();

//copy it

bool res = StretchBlt(destHDC, 20, 20, width, height,

srcHdc, 0, 0, width, height, 13369376);

//release handles

bmpGraphic.ReleaseHdc();

dest1Pic.ReleaseHdc();

}

private void button1_Click(object sender, EventArgs e)

{

renderTextLineFromBitmap();

}

}

}

test2.bmp

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