#include for a class I created

Posted on 2000-02-26
Last Modified: 2013-11-18
I am creating a simple drawing program in Visual C++.  The program is a garden variety Win32 type program (no MFC).

I have a custom made class I am trying to include in the main source code.

I am getting lots of errors that don't make sense to me:

--------------------Configuration: MenuDemo - Win32 Debug--------------------
c:\windows\desktop\csis 3330\program 3\objectsdrawn.h(12) : error C2061: syntax error : identifier 'ObjectsDrawn'
c:\windows\desktop\csis 3330\program 3\objectsdrawn.h(12) : error C2059: syntax error : ';'
c:\windows\desktop\csis 3330\program 3\objectsdrawn.h(13) : error C2449: found '{' at file scope (missing function header?)
c:\windows\desktop\csis 3330\program 3\objectsdrawn.h(20) : error C2059: syntax error : '}'
c:\windows\desktop\csis 3330\program 3\menudemo.c(27) : error C2065: 'WndProc' : undeclared identifier
c:\windows\desktop\csis 3330\program 3\menudemo.c(27) : warning C4047: '=' : 'long (__stdcall *)(struct HWND__ *,unsigned int ,unsigned int ,long )' differs in levels of indirection from 'int '
c:\windows\desktop\csis 3330\program 3\menudemo.c(62) : error C2373: 'WndProc' : redefinition; different type modifiers
Error executing cl.exe.

MenuDemo.exe - 6 error(s), 1 warning(s)

I will paste the source code for the main program and the class separately.

Question by:Tom Knowlton
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Author Comment

by:Tom Knowlton
ID: 2561093
Source code for MAIN program.  When I comment out the "#include "ObjectsDrawn.h" the program compiles just fine.

   MENUDEMO.C -- Menu Demonstration
                 (c) Charles Petzold, 1998

#include <windows.h>
#include "resource.h"
#include "ObjectsDrawn.h"
#define ID_TIMER 1


TCHAR szAppName[] = TEXT ("MenuDemo") ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
     HWND     hwnd ;
     MSG      msg ;
     WNDCLASS wndclass ;
          = CS_HREDRAW | CS_VREDRAW ;
     wndclass.lpfnWndProc   = WndProc ;
     wndclass.cbClsExtra    = 0 ;
     wndclass.cbWndExtra    = 0 ;
     wndclass.hInstance     = hInstance ;
     wndclass.hIcon         = LoadIcon (NULL, IDI_APPLICATION) ;
     wndclass.hCursor       = LoadCursor (NULL, IDC_ARROW) ;
     wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
     wndclass.lpszMenuName  = szAppName ;
     wndclass.lpszClassName = szAppName ;
     if (!RegisterClass (&wndclass))
          MessageBox (NULL, TEXT ("This program requires Windows NT!"),
                      szAppName, MB_ICONERROR) ;
          return 0 ;
     hwnd = CreateWindow (szAppName, TEXT ("Menu Demonstration"),
                          CW_USEDEFAULT, CW_USEDEFAULT,
                          CW_USEDEFAULT, CW_USEDEFAULT,
                          NULL, NULL, hInstance, NULL) ;
     ShowWindow (hwnd, iCmdShow) ;
     UpdateWindow (hwnd) ;
     while (GetMessage (&msg, NULL, 0, 0))
          TranslateMessage (&msg) ;
          DispatchMessage (&msg) ;
     return msg.wParam ;

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
     static int idColor [5] = { WHITE_BRUSH,  LTGRAY_BRUSH, GRAY_BRUSH,
                                DKGRAY_BRUSH, BLACK_BRUSH } ;
     static int iSelection = IDM_BKGND_WHITE ;
     HMENU      hMenu ;
     switch (message)
     case WM_COMMAND:
          hMenu = GetMenu (hwnd) ;
          switch (LOWORD (wParam))
          case IDM_CLEAR:
                     //MessageBox (hwnd, TEXT ("Clear function not yet implemented!"),
               //            szAppName, MB_ICONEXCLAMATION | MB_OK) ;
               return 0 ;
          case IDM_APP_EXIT:
               SendMessage (hwnd, WM_CLOSE, 0, 0) ;
               return 0 ;
          case IDM_EDIT_UNDO:
          case IDM_EDIT_CUT:
          case IDM_EDIT_COPY:
          case IDM_EDIT_PASTE:
          case IDM_EDIT_CLEAR:
               MessageBeep (0) ;
               return 0 ;
          case IDM_BKGND_WHITE:         // Note: Logic below
          case IDM_BKGND_LTGRAY:        //   assumes that IDM_WHITE
          case IDM_BKGND_GRAY:          //   through IDM_BLACK are
          case IDM_BKGND_DKGRAY:        //   consecutive numbers in
          case IDM_BKGND_BLACK:         //   the order shown here.
               CheckMenuItem (hMenu, iSelection, MF_UNCHECKED) ;
               iSelection = LOWORD (wParam) ;
               CheckMenuItem (hMenu, iSelection, MF_CHECKED) ;
               SetClassLong (hwnd, GCL_HBRBACKGROUND, (LONG)
                             (idColor [LOWORD (wParam) - IDM_BKGND_WHITE])) ;
               InvalidateRect (hwnd, NULL, TRUE) ;
               return 0 ;
          case IDM_TIMER_START:
               if (SetTimer (hwnd, ID_TIMER, 1000, NULL))
                    EnableMenuItem (hMenu, IDM_TIMER_START, MF_GRAYED) ;
                    EnableMenuItem (hMenu, IDM_TIMER_STOP,  MF_ENABLED) ;
               return 0 ;
          case IDM_TIMER_STOP:
               KillTimer (hwnd, ID_TIMER) ;
               EnableMenuItem (hMenu, IDM_TIMER_START, MF_ENABLED) ;
               EnableMenuItem (hMenu, IDM_TIMER_STOP,  MF_GRAYED) ;
               return 0 ;
          case IDM_APP_HELP:
               MessageBox (hwnd, TEXT ("Help not yet implemented!"),
                           szAppName, MB_ICONEXCLAMATION | MB_OK) ;
               return 0 ;
          case IDM_APP_ABOUT:
               MessageBox (hwnd, TEXT ("Menu Demonstration Program\n")
                                 TEXT ("(c) Charles Petzold, 1998"),
                           szAppName, MB_ICONINFORMATION | MB_OK) ;
               return 0 ;
          break ;
     case WM_TIMER:
          MessageBeep (0) ;
          return 0 ;
     case WM_DESTROY:
          PostQuitMessage (0) ;
          return 0 ;
     return DefWindowProc (hwnd, message, wParam, lParam) ;

Author Comment

by:Tom Knowlton
ID: 2561095
H file for the OjbectsDrawn class

// ObjectsDrawn.h: interface for the ObjectsDrawn class.

#if !defined(AFX_OBJECTSDRAWN_H__204F6F06_EC28_11D3_B73C_9DAC4BE0123B__INCLUDED_)
#define AFX_OBJECTSDRAWN_H__204F6F06_EC28_11D3_B73C_9DAC4BE0123B__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

class ObjectsDrawn  
      int a;
      virtual ~ObjectsDrawn();


#endif // !defined(AFX_OBJECTSDRAWN_H__204F6F06_EC28_11D3_B73C_9DAC4BE0123B__INCLUDED_)

Author Comment

by:Tom Knowlton
ID: 2561097
CPP for the ObjectsDrawn class

// ObjectsDrawn.cpp: implementation of the ObjectsDrawn class.

#include "ObjectsDrawn.h"

// Construction/Destruction




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LVL 86

Accepted Solution

jkr earned 100 total points
ID: 2561113
Your problem seems to be the name of the file 'MENUDEMO.C' - the compiler assumes this to be plain 'C' source and doesn't recognize C++ classes - change the name of the file to read 'MENUDEMO.CPP', this should remedy your problems.

Feel free to ask if you need more information!

Author Comment

by:Tom Knowlton
ID: 2561200
This did the trick!  Thank you so much!

Why doesn't VC just default the file extension to .cpp????  Wouldn't that be easier?  Then both C and C++ source code would be handled.
LVL 86

Expert Comment

ID: 2561342
It's a cenvention files with the .c extension are treated as plain 'C' (by every C++ compiler)

BTW: VC defaults the extension to .cpp when saving a newly created file - but as you apparently took the sample 'as is', you ran into trouble... there's however a workaround when the problem is 'the other way round' - code can be guarded by using

#ifdef __cplusplus
// C++ specific code here

Author Comment

by:Tom Knowlton
ID: 2573238
Oh, okay, cool!

Thanks again for the help and the info!


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