// 将原图像的信息拷贝至新图像

    LPBITMAPINFOHEADER  m_lpBMIH_new;

    int nSize = bmfh.bfOffBits - sizeof(BITMAPFILEHEADER);

    m_lpBMIH_new = (LPBITMAPINFOHEADER) new char[nSize];

    memcpy(m_lpBMIH_new, m_lpBMIH, nSize);

    // 对目标图像的高、宽、像素区大小等信息进行修改

    m_lpBMIH_new->biHeight = m_RB.y - m_LU.y + 1;

    m_lpBMIH_new->biWidth = m_RB.x - m_LU.x + 1;

    m_lpBMIH_new->biSizeImage = n_DesRowByte * m_lpBMIH_new->biHeight;

    // （3）对像素区进行逐行拷贝，并对每行拷贝结果进行偏移

    LPBYTE m_lpImage_new, m_lpSrc_Start, m_lpDes_Start;

    m_lpImage_new = (LPBYTE) new char[m_lpBMIH_new->biSizeImage];

    int i;

    for(i = m_RB.y; i >= m_LU.y; i--){

        m_lpSrc_Start = m_lpImage + (n_Height-1-i) * n_OriRowByte + n_StartByte;

        m_lpDes_Start = m_lpImage_new + (m_RB.y-i) * n_DesRowByte;

        CopyRow(m_lpSrc_Start, m_lpDes_Start, n_CopyByte, n_StartBit, n_EndBit, n_DesRowByte);

    }