MFC+opencv 显示mat图像

/*****************************************************
*
* 函数名称： void DrawcvMat(cv::Mat m_cvImg, UINT ID)
* 函数功能： 在picture control中显示图像，设置Freame或者rectangle都可以
*
* ****************************************************/
void CMFC_showImageDemoDlg::DrawcvMat(cv::Mat m_cvImg, UINT ID)
{
cv::Mat img;
CRect rect;

GetDlgItem(ID)->GetClientRect(&rect);
if (rect.Width()%4 != 0)
{
rect.SetRect(rect.left, rect.top, rect.left + (rect.Width() + 3) / 4 * 4, rect.bottom);  //调整图像宽度为4的倍数
GetDlgItem(ID)->SetWindowPos(NULL, rect.left, rect.top, rect.Width(), rect.Height(), SWP_NOMOVE);
}

cv::Rect dst(rect.left, rect.top, rect.right, rect.bottom);
cv::resize(m_cvImg, img, cv::Size(rect.Width(), rect.Height()));  //使图像适应控件大小

unsigned int m_buffer[sizeof(BITMAPINFOHEADER) + sizeof(RGBQUAD)*256];
BITMAPINFO* m_bmi = (BITMAPINFO*) m_buffer;
BITMAPINFOHEADER* m_bmih = &(m_bmi->bmiHeader);
memset(m_bmih, 0, sizeof(*m_bmih));
m_bmih->biSize = sizeof(BITMAPINFOHEADER);
m_bmih->biWidth = img.cols;   //必须为4的倍数
m_bmih->biHeight = -img.rows; //在自下而上的位图中 高度为负
m_bmih->biPlanes = 1;
m_bmih->biCompression = BI_RGB;
m_bmih->biBitCount = 8 * img.channels();

if (img.channels() == 1)  //当图像为灰度图像时需要设置调色板颜色
{
for (int i = 0; i < 256; i++)
{
m_bmi->bmiColors[i].rgbBlue = i;
m_bmi->bmiColors[i].rgbGreen = i;
m_bmi->bmiColors[i].rgbRed = i;
m_bmi->bmiColors[i].rgbReserved = 0;
}
}

CDC *pDC = GetDlgItem(ID)->GetDC();
::StretchDIBits( pDC->GetSafeHdc(), 0, 0, rect.Width(), rect.Height(), 0, 0, rect.Width(), rect.Height(), img.data, (BITMAPINFO*) m_bmi, DIB_RGB_COLORS, SRCCOPY );
ReleaseDC(pDC);
}