从HDC转换到leptonica PIX

void CAssistDlg::OnBnClickedTest()
{
    HDC hdc = ::GetDC(NULL);
    HDC hdcMem = CreateCompatibleDC(hdc);
    HBITMAP hBmpMem = CreateCompatibleBitmap(hdc, , );
    HBITMAP hBmpOld = (HBITMAP)SelectObject(hdcMem, hBmpMem);
    BitBlt(hdcMem, , , , , hdc, , , SRCCOPY);

    {
        HDC hdcThis = GetDC()->GetSafeHdc();
        BitBlt(hdcThis, , , , , hdcMem, , , SRCCOPY);

        BITMAP bmp = {};//BITMAPINFO;BITMAPINFOHEADER;
        int ret = ::GetObject(hBmpMem, sizeof(bmp), &bmp);

        BITMAPINFOHEADER bmi = {};
        bmi.biSize = sizeof(bmi);
        bmi.biWidth = bmp.bmWidth;
        bmi.biHeight = -bmp.bmHeight;
        bmi.biPlanes = bmp.bmPlanes;
        bmi.biBitCount = bmp.bmBitsPixel;
        bmi.biSizeImage = bmp.bmWidth * bmp.bmHeight * bmp.bmBitsPixel / ;
        bmi.biCompression = BI_RGB;

        BYTE *pBuf = new BYTE[bmi.biSizeImage];
        int ret2 = GetDIBits(hdcMem, hBmpMem, , bmp.bmHeight, pBuf, (BITMAPINFO*)&bmi, DIB_RGB_COLORS);    

        for (int i = ;i < bmp.bmHeight;++i)
        {
            for (int j = ;j < bmp.bmWidth;++j)
            {
                BYTE r = pBuf[j *  + i * bmp.bmWidthBytes + ];
                BYTE g = pBuf[j *  + i * bmp.bmWidthBytes + ];
                BYTE b = pBuf[j *  + i * bmp.bmWidthBytes + ];

                pBuf[j *  + i * bmp.bmWidthBytes + ] = r; //r
                pBuf[j *  + i * bmp.bmWidthBytes + ] = g; //g
                pBuf[j *  + i * bmp.bmWidthBytes + ] = b; //b
                pBuf[j *  + i * bmp.bmWidthBytes + ] = 0xff; //a
            }
        }

        PIX pix = {};
        pix.w = bmp.bmWidth;
        pix.h = bmp.bmHeight;
        pix.informat = IFF_BMP;
        pix.d = bmp.bmBitsPixel;
        pix.wpl = bmp.bmWidthBytes / ;
        pix.data = (l_uint32 *)pBuf;
        pix.refcount = ;
        pixWrite("D:\\pix.bmp", &pix, IFF_BMP);

　　     delete []pBuf;
    }

    SelectObject(hdcMem,hBmpOld);
    DeleteDC(hdcMem);
    DeleteObject(hBmpMem);
    ::ReleaseDC(NULL, hdc);
}