ARGB32位转化为RGB24位的函数（修改版）

BOOL CCAPDlg::Convert24Image(BYTE *p32Img, BYTE *p24Img, DWORD dxSize32, DWORD dySize32)
{

if(p32Img != NULL && p24Img != NULL && dxSize32>0&& dySize32>0&& dxSize32%4==0)
{
BYTE *pTemp,*ptr;

pTemp = p32Img;
ptr = p24Img;

for (int j = dySize32-1; j >=0 ; j--)
{
for (int i = 0; i < int(dxSize32) ; i++)
{
unsigned char r = pTemp[dxSize32*j*4+i*4];
unsigned char g = pTemp[dxSize32*j*4+i*4+1];
unsigned char b = pTemp[dxSize32*j*4+i*4+2];

*(ptr++) = r;
*(ptr++) = g;
*(ptr++) = b;
}
}
}
else
{
return false;
}

return true;
}