Cimage. The Draw show that single channel image is black-CodePudding

 
CRect rect;//define the rectangle class 
The CWnd * pWnd=GetDlgItem (ID_ShowPi2);//access control handle 
PWnd - & gt; GetClientRect (& amp; The rect);//get a handle to the size of the control area 
The CDC * pDc=pWnd - & gt; GetDC ();//picture for DC 
//int win_w=the rect. Width (), win_h=the rect. Height ();//get window wide high 
CImage imgae; 
Mat temp. 
The resize (img, temp, the Size (the rect. Width (), the rect. Height ())); 
MatToCImage (temp, imgae); 
PDc - & gt; SetStretchBltMode (COLORONCOLOR); 
Imgae. The Draw (pDc - & gt; M_hDC, 0, 0, the rect. Width () of the rect. Height (), 0, 0, the rect. The Width (), the rect. Height ());//draw a picture 
The ReleaseDC (pDc);

This code can only display color images to show the single channel image,