ARGB32位转化为RGB24位的函数

bool CVMR_Capture::Convert24Image(BYTE *p32Img, BYTE *p24Img,DWORD dwSize32)
{

if(p32Img != NULL && p24Img != NULL && dwSize32>0)
{

DWORD dwSize24;

dwSize24=(dwSize32 * 3)/4;

BYTE *pTemp,*ptr;

pTemp=p32Img;
ptr = p24Img;

int ival=0;
for (DWORD index = 0; index < dwSize32/4 ; index++)
{
unsigned char r = *(pTemp++);
unsigned char g = *(pTemp++);
unsigned char b = *(pTemp++);
(pTemp++);//skip alpha

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

return true;
}