<windows.h>

This is a discussion on <windows.h> within the C++ Programming forums, part of the General Programming Boards category; hey i'm really curious about being able to program with windows interface. I just finished my C++ class but I'm ...

  1. #1
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    <windows.h>

    hey i'm really curious about being able to program with windows interface. I just finished my C++ class but I'm an IS major so i really just learned how to do simple business apps. I tried compiling the sample code in the tutorial and it didn't work in microsoft visual C++ 6.0.

    could someone post a really simple program (producing a cool window to the screen) that I could copy and mess around with?

    Do IO streams and basic rules stay the same in a windows environment?

    thanks in advance.
    cout << "\aBIOTCH";

  2. #2
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    "could someone post a really simple program"

    lol. Here's a windows programming Hello World program:
    Code:
    #include <windows.h>
    
    long WINAPI WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
    
    int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
                       LPSTR lpCmdLine, int nCmdShow)
    {
       WNDCLASS WindowClass;                 
    
       static char szAppName[] = "OFWin";    
       HWND hWnd;                           
       MSG msg;                              
    
       
       WindowClass.style   = CS_HREDRAW | CS_VREDRAW;
    
       
       WindowClass.lpfnWndProc = WindowProc;
    
       WindowClass.cbClsExtra = 0;          
       WindowClass.cbWndExtra = 0;          
    
       WindowClass.hInstance = hInstance;   
    
       
       WindowClass.hIcon = LoadIcon(0, IDI_APPLICATION);
    
       
       WindowClass.hCursor = LoadCursor(0, IDC_ARROW);
    
       
       WindowClass.hbrBackground = static_cast<HBRUSH>(GetStockObject(GRAY_BRUSH));
    
       WindowClass.lpszMenuName = 0;           
    
       WindowClass.lpszClassName = szAppName;  
    
       
       RegisterClass(&WindowClass);
    
       
       hWnd = CreateWindow(
              szAppName,                       
              "A Basic Window the Hard Way",   
              WS_OVERLAPPEDWINDOW,             
              CW_USEDEFAULT,         
              CW_USEDEFAULT,         
              CW_USEDEFAULT,         
              CW_USEDEFAULT,         
              0,                     
              0,                     
              hInstance,             
              0                      
            );
    
       ShowWindow(hWnd, nCmdShow);  
       UpdateWindow(hWnd);           
    
       while(GetMessage(&msg, 0, 0, 0) == TRUE)   
       {
          TranslateMessage(&msg);                 
          DispatchMessage(&msg);                 
       }
    
       return msg.wParam;                        
    }
    
    
    
    long WINAPI WindowProc(HWND hWnd, UINT message, WPARAM wParam,
                           LPARAM lParam)
    {
       HDC hDC;                       
       PAINTSTRUCT PaintSt;           
       RECT aRect;                   
    
       switch(message)                
       {
          case WM_PAINT:                       
             hDC = BeginPaint(hWnd, &PaintSt); 
    
             
             GetClientRect(hWnd, &aRect);
    
             SetBkMode(hDC, TRANSPARENT);      
    
             
             DrawText(
                 hDC,                  
                 "But, soft! What light through yonder window breaks?",
                 -1,                   
                 &aRect,              
                 DT_SINGLELINE|        
                 DT_CENTER|            
                 DT_VCENTER);          
    
             EndPaint(hWnd, &PaintSt); 
             return 0;
    
          case WM_DESTROY:             
             PostQuitMessage(0);
             return 0;
    
          default:            
                               
             return DefWindowProc(hWnd, message, wParam, lParam);
       }
    }
    Last edited by 7stud; 04-29-2003 at 01:34 AM.

  3. #3
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    Code:
    Linking...
    LIBCD.lib(crt0.obj) : error LNK2001: unresolved external symbol _main
    Debug/win.exe : fatal error LNK1120: 1 unresolved externals
    Error executing link.exe.

    compiled fine but got this message when i tried to build..
    cout << "\aBIOTCH";

  4. #4
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    Did you notice that there's no main() function?

  5. #5
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    this isn't it?

    Code:
    int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
                       LPSTR lpCmdLine, int nCmdShow)
    cout << "\aBIOTCH";

  6. #6
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    When you build Win32 Application you'll have a WinMain() as the entry point of the program, a Win32 Console Application will use main()

    Try rebuild the workspace with Win32 Application.
    Merc

  7. #7
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    If you go to the project settings you should be able to switch it in there. There should be a compiler option /subsystem:console just change that to /subsystem:windows

  8. #8
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    It's always frustrating getting a compiler set-up properly.

    Do IO streams and basic rules stay the same in a windows environment?
    Hmmm... The Visual C++ compiler "attempts" to be ANSI/ISO compliant. (Some people think that it's compliance sucks.) So, I would say the "basic rules" do stay the same. All the Windows functions are additional to the standard stuff.

    But, Windows does have it's own special ways of handling keyboard input, and output to the screen. (Notice that there is no cout in the example.)

    I recommend Charles Petzold's "Programming Windows" book.

  9. #9
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    hmmm i get this when trying to build, what does it mean?is it because im using win 2000 pro?
    Code:
    --------------------Configuration: trash - Win32 Debug--------------------
    Linking...
    LINK : fatal error LNK1104: cannot open file "kernel32.lib"
    Error executing link.exe.
    
    trash.exe - 1 error(s), 0 warning(s)
    i got the directories set to that file, but wont open it?matter of fact, there are 3 differant kernal32.lib's on my computer, tried everyone of them and it wont open when trying to build.

  10. #10
    It's full of stars adrianxw's Avatar
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    When you install VC it sets up it's paths to things like kernel32. If you have changed them, then I suggest you put them back to what they were.

    To compile and link something simple like that posted above, you do not need to change anything, it should work out of the box.
    Wave upon wave of demented avengers march cheerfully out of obscurity unto the dream.

  11. #11
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    Did you illegally copy VC++ 6.0?

  12. #12
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    Change something on my computer? never! lol i changed the directories, but put them back to system , and yes there is a kernel32.lib that came with vc, but still wont compile.

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