이런 mfc! CBitmap을 Bitblt 하는 법

void CBMPLoaderDlg::drawBitmapFromPath(CString path)
{
    CFile file;
    BITMAPFILEHEADER bfh;
    BITMAPINFOHEADER bih;
    BYTE* bits = NULL;
 
    CBitmap bm;
    CDC *clientDC;
    CDC memDC;
 
    try
    {
        if(! file.Open(path, CFile::modeRead))
            throw "File not found";
 
        if(file.Read(&bfh, sizeof(BITMAPFILEHEADER)) < sizeof(BITMAPFILEHEADER))
            throw "Not bmp file";
        if(file.Read(&bih, sizeof(BITMAPINFOHEADER)) < sizeof(BITMAPINFOHEADER))
            throw "Not bmp file";
        bits = new BYTE[bih.biSizeImage];
        if(file.Read(bits, bih.biSizeImage) < bih.biSizeImage)
            throw "Not bmp file";
 
        if(! bm.CreateBitmap(bih.biWidth, bih.biHeight, bih.biPlanes, bih.biBitCount, bits))
            throw "Could not create bitmap";
        clientDC = this->GetDC();
        memDC.CreateCompatibleDC(clientDC);
        memDC.SelectObject(bm);
 
        clientDC->BitBlt(0, 0, bih.biWidth, bih.biHeight, &memDC, 0, 0, SRCCOPY);
    }
    catch(char *e)
    {
        TRACE("%s\n", e);
    }
}