INFO: Microsoft Foundation Classes Do Not Support QuickWin Apps

• The Microsoft Foundation Classes (MFC) included with:

      - Microsoft C/C++, version 7.0
      - Microsoft Visual C++ for Windows, versions 1.0, 1.5
  

SUMMARY

You cannot develop a QuickWin application with the Microsoft Foundation Class (MFC) Libraries versions 1.0 and 2.0. The libraries were not designed or tested for use with QuickWin applications and may not work correctly.

MORE INFORMATION

A QuickWin application is designed to provide a fast method to convert an application designed for the MS-DOS operating system into an application designed for the Microsoft Windows operating system. If you developed an MS- DOS application with the Microsoft Foundation Classes you may be able to create a QuickWin application that uses that part of the Microsoft Foundation Classes that supports MS-DOS applications. Microsoft did not design or test the Microsoft Foundation Classes libraries in this manner and does not support using them for this purpose. You can build a QuickWin application using the Microsoft Foundation Classes libraries by performing the following five steps; however, do so only at your own risk:

1. In the Visual Workbench, Project Options from the Options menu, select QuickWin application as the Project Type.

2. Remove the check box from "Use Microsoft Foundation Classes." If you choose this check box, Visual Workbench links in the Windows version of the Microsoft Foundation Classes library.

3. In the Linker Options, set the "Prevent Use of Extended Dictionary" check box.

4. Manually add the appropriate MS-DOS version of the Microsoft Foundation Classes library to the library list for either the debug or release build (for example, MAFXCR, MAFXCRD, and so on). Verify that the appropriate Microsoft Foundation Classes library is listed first in the Linker Options.

5. Verify that _DOS is defined when you include <AFX.H> and that _WINDOWS is not defined. Include the file with the following lines of code:

         #ifdef _WINDOWS
            #undef _WINDOWS
            #define _DOS
            #include <afx.h>
            #undef _DOS
            #define _WINDOWS
         #endif
   
   

Sample Code

   /*
    * Compiler options needed: See above
    */

   #ifdef _WINDOWS
      #undef _WINDOWS
      #define _DOS
      #include <afx.h>
      #undef _DOS
      #define _WINDOWS
   #endif

   #include <iostream.h>

   void main()
   {
      CString myString ("Hello, world");
      cout << myString << endl;
   }