请教:关于bmp转为jpg文件的问题.
.....
HDC dc;
dc = GetWindowDC(0);
try
{
mydc->Handle = dc;
R = Rect(0, 0, Screen->Width, Screen->Height);
bmpmap1->Width = R.Right;
bmpmap1->Height = R.Bottom;
bmpmap1->PixelFormat = pf15bit;
bmpmap1->Canvas->CopyRect(R, mydc, R);
}
__finally{
ReleaseDC(0, dc);
}
......
myjpeg->Assign(bmpmap1);
//这时截取的屏幕图像如果是1024*768大小,16位颜色,bmp图大约1.5-2.3MB之间,
经过 myjpeg->Assign(bmpmap1);后转为的jpg图像大约是多少?
谢谢答复.