请问我使用SetBitmapBits把图像BYTE数据显示到面板为什么不对啊

Question

pData中的数据是3个字节一个像素，请问大神们我这样做为什么还是显示有问题啊？

void fun(CDC *pDC, BYTE *pData, int width, int height)
{
    CDC memDC;
    memDC.CreateCompatibleDC(pDC);

    CBitmap bmp;
    bmp.CreateCompatibleBitmap(pDC, width, height);

    long size = width * height * 4;
    BYTE *pBuff = new BYTE[size];
    for (int i = 0; i < width*height; ++i)
    {
        pBuff[i*4] = pData[i*3];
        pBuff[i*4 + 1] = pData[i*3+1];
        pBuff[i*4 + 2] = pData[i*3+2];
        pBuff[i*4 + 3] = 0;
    }

    bmp.SetBitmapBits(size, pBuff);

    CBitmap *pOldBmp = memDC.SelectObject(&bmp);

    memDC.BitBlt(0, 0, width, height, &memDC, 0, 0, SRCCOPY);

    memDC.SelectObject(pOldBmp);
    delete[] pBuff;
}

Answer 1

pBuff是argb四通道位图么？alpha通道如果在低字节上，应该是
pBuff[i*4] = 0
pBuff[i*4 + 1] = pData[i*3];
pBuff[i*4 + 2] = pData[i*3+1];
pBuff[i*4 + 3] = pData[i*3+2];
你最好调试下看看