ControlWizard Generates Both 16-bit and 32-bit Projects (125242)

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When ControlWizard is used to create an OLE control, two projects are generated. The full project name you specify is used as the base name for the 16-bit MAK file and other files used by the 16-bit IDE. The first six letters of the project name followed by "32" are used to create a base name for the 32-bit MAK and DEF files and other files used by the 32-bit IDE.

For example, if the full project name is TESTCTRL, these two MAK files are generated: ControlWizard also generates a 'makefile' file that NMAKE can use to generate either a 16- or 32-bit project by specifying the WIN32 flag on the command line. For example:

nmake WIN32=1       // 32 bit version
nmake WIN32=0       // 16 bit version
				

Within the generated source files, place platform-dependent code in conditional compilation blocks, as shown in this example:

   LRESULT CTestCtrl::OnOcmCommand(WPARAM wParam, LPARAM lParam)
   {
   #ifdef _WIN32
      WORD wNotifyCode = HIWORD(wParam);
   #else
      WORD wNotifyCode = HIWORD(lParam);
   #endif

      // TODO: Switch on wNotifyCode here.

      return 0;
   }
				

To maintain platform independence, use conditional compilation blocks to isolate platform dependencies in the code you add to your control. Use the #error statement to flag features that are not implemented for one platform or the other. For example, you might code the previous example like the following if the 32-bit implementation was not complete:

   LRESULT CTestCtrl::OnOcmCommand(WPARAM wParam, LPARAM lParam)
   {
   #ifdef _WIN32
      #error OnOcmCommand parameter decoding not completed for Win32!
   #else
      WORD wNotifyCode = HIWORD(lParam);
   #endif

      // TODO: Switch on wNotifyCode here.

      return 0;
   }
				

Note that because separate project files are used for 16- and 32-bit targets, all project maintenance will need to be performed for both projects. Project maintenance activities include:

• Adding or removing project files.
• Changing compiler settings.
• Changing linker settings, including input libraries.