【DIP Learining MFC &OpenCV】 Experience by 20171026

This day saw the progress I achieved in creating a fusion of MFC frame and OpenCV code as well as some settled problems. But it is quite late now cause the time for me to prepare the small thesis of the Micro-computer course is not enough, if I spent further time on writing this today. So I'm gonna display those settled problems here and finish this essay the other day, in the future but soon.

[1]Open files(especially images) in dialog-based  MFC programme by selecting files in a new dialog, which is just like what we use to see in Windows system;

[2]Switch the CString vars to char* or string vars;

[3]Show the image in picture control without stretching it even with scaling considered;

[4]Remove the former image while displaying a new one;

[5]How to deal with the error which appears when we try to open a image without choosing anything;

[6]Cope with the error that .png images can not be opened.

unfinished...2017-10-26 21:26:25

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updated

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Firstly, we should choose a starting button in a dialog or in a menu. In this programme, menu is chosen. If you have no idea how to create a new dialog by  clicking the menu, turn to this article:#MFC Programming# Using Dialog To Set A Correlate Menu

Since we have got a dialog and a correlate menu, what we need to do create a system dialog which can implement file-reading and file-saving[1].

To start with, we should add a new class of the dialog but the dialog Delimage in this project has had a class when the dialog-based project is created. Therefore, we just need to add a event handler of the submenu Open:

Now we open the Event Handler Wizard:

Any class in the class view is ok but considering convenience and visibility, we choose CCV_OpenImageDlg followed by editing the code:

(Actually followed by Add and Edit because I have already added one)

Then a message response function OnImageopen() is created. It is time that we started writing the code:

 void CCV_OpenImageDlg::OnImageopen()
 {
     Invalidate();  //Update the dialog including the picture control
     CFileDialog dlg(TRUE, NULL, NULL, OFN_FILEMUSTEXIST | OFN_PATHMUSTEXIST | OFN_READONLY,
         TEXT("支持的图像文件 (*.jpg;*.png;*.gif;*.bmp;...)|*.jpg;*.png;*.gif;*.bmp|专用Tiff图像文件(*.tiff;*.tif)|*.tiff;*.tif|所有文件(*.*)|*.*||"), NULL);
     dlg.m_ofn.nFilterIndex = ;
     dlg.m_ofn.hwndOwner = m_hWnd;
     dlg.m_ofn.lStructSize = sizeof(OPENFILENAME);
     dlg.m_ofn.lpstrTitle = TEXT("打开图像文件...\0");
     dlg.m_ofn.nMaxFile = MAX_PATH;
     if (dlg.DoModal() == IDOK)
     {
         m_path = dlg.GetPathName();
         UpdateData(FALSE);
     }
     else
         return;
     //string s_path(m_path.GetBuffer());    //then there should be #include <string.h>
     char *s_path;
     s_path = m_path.GetBuffer(m_path.GetLength());   //switch CString to Char *
     m_StaticPath.SetWindowTextA(m_path);             //write the image path to static text control
     Mat Mat_image = imread(s_path, );
     IplImage image = Mat_image;
     DrawPicToHDC(&image, ID_SHOWLEFT);
 }

Display of result:

unfinished...2017-10-28 11:39:59