Display image in the MFC window

On the first day, I made this thing (implemented by opencv ):

First, you can display images on the left. After selecting different images, click the capture button to save the images in a small window on the right.

Solve the problem of an adaptive window for image display today:

Generally, when creating an image, we need to assign the image length and width. Can we assign the window length and width to the image? The answer is yes.

First, we need to get the window handle:

Crect r_show;
Getdlgitem (ID)-> getclientrect (r_show );

The ID is the ID of the window (the right-click window property will be displayed)

Then, get the length and width:

Int widthpos = r_show.width ();
Int heightpos = r_show.height ();

Just assign them to the image.

Iplimage * IMG = 0;
Cvsize dst_cvsize;

Dst_cvsize.width = widthpos;
Dst_cvsize.height = heightpos;
IMG = cvcreateimage (dst_cvsize, Src-> depth, Src-> nchannels );

At first, I was scared when I saw the handle. Later I realized that it was really useful!

Below is the function code for displaying images (for your reference only ):

// Myshowmfc (iplimage * SRC, CDC * PDC, uint ID) the first parameter is the image to be displayed,
// The second parameter is the window handle, and the third parameter is the ID of the control that displays the image.
Void cexamineeyedlg: myshowmfc (iplimage * SRC, CDC * PDC, uint ID)
{
Crect r_show;
Getdlgitem (ID)-> getclientrect (r_show); // get the handle of the Image Display Control.
Int xpos = r_show.left;
Int ypos = r_show.top;
Int widthpos = r_show.width ();
Int heightpos = r_show.height ();

Iplimage * IMG = 0;
Cvsize dst_cvsize; // target image size
Dst_cvsize.width = widthpos;
Dst_cvsize.height = heightpos;
IMG = cvcreateimage (dst_cvsize, Src-> depth, Src-> nchannels); // construct the Target Image
Cvresize (SRC, IMG, cv_inter_linear); // scale the source image to the Target Image
// Src = cvcloneimage (IMG );
DWORD Height = IMG-> height;
DWORD width = IMG-> width;
DWORD linebytes = (width * 8 + 31)/32*4;
DWORD linebytes24 = (width * 24 + 31)/32*4;
Byte * temp = new byte [img-> height * linebytes24];
If (! Temp) return;
Memset (temp, 0, height * linebytes24 );
Word bitcount;
If (IMG-> nchannels = 1)
{
Bitcount = 8;
}
Else if (IMG-> nchannels = 3)
{
Bitcount = 24;
}
Else
{
Delete [] temp;
Temp = NULL;
Return;
}
If (bitcount = 8)
{
For (INT I = 0; I height; I ++)
{
For (Int J = 0, n = 0; j width * 3; j ++, N ++)
{
* (Temp + linebytes24 * (height-1-i) + J) = (byte) (uchar *) (IMG-> imagedata + IMG-> widthstep * I) [N];
J ++;
* (Temp + linebytes24 * (height-1-i) + J) = (byte) (uchar *) (IMG-> imagedata + IMG-> widthstep * I) [N];
J ++;
* (Temp + linebytes24 * (height-1-i) + J) = (byte) (uchar *) (IMG-> imagedata + IMG-> widthstep * I) [N];
}
}
}
Else
{
For (INT I = 0; I height; I ++)
{
For (Int J = 0, n = 0; j width * 3; j ++, N ++)
{
* (Temp + linebytes24 * (height-1-i) + J) = (byte) (uchar *) (IMG-> imagedata + IMG-> widthstep * I )) [3 * n];
J ++;
* (Temp + linebytes24 * (height-1-i) + J) = (byte) (uchar *) (IMG-> imagedata + IMG-> widthstep * I )) [3 * n + 1];
J ++;
* (Temp + linebytes24 * (height-1-i) + J) = (byte) (uchar *) (IMG-> imagedata + IMG-> widthstep * I )) [3 * n + 2];
}
}
}
Bitmapinfo Bi;
Bi. bmiheader. bibitcount = 24;
Bi. bmiheader. biclrimportant = 0;
Bi. bmiheader. biclrused = 0;
Bi. bmiheader. bicompression = 0l;
Bi. bmiheader. biheight = height;
Bi. bmiheader. biplanes = 1;
Bi. bmiheader. bisize = sizeof (bitmapinfoheader );
Bi. bmiheader. bisizeimage = height * linebytes;
Bi. bmiheader. biwidth = width;
Bi. bmiheader. bixpelspermeter = 0;
Bi. bmiheader. biypelspermeter = 0;
Stretchdibits (PDC-> m_hdc, width, height, width, height, temp, (bitmapinfo *) & BI, dib_rgb_colors, srccopy );
Cvreleaseimage (& IMG );
Delete [] temp;
Temp = NULL;
}