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First_File.cpp
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First_File.cpp：Code Content
  2. #include <windows.h>  
  3. #include "First_File.h" 
  6. #if defined (WIN32)
  7. #define IS_WIN32 TRUE
  8. #else
  9. #define IS_WIN32 FALSE
  10. #endif
  12. #define IS_NT      IS_WIN32 && (BOOL)(GetVersion() < 0x80000000)
  13. #define IS_WIN32S  IS_WIN32 && (BOOL)(!(IS_NT) && (LOBYTE(LOWORD(GetVersion()))<4))
  14. #define IS_WIN95   (BOOL)(!(IS_NT) && !(IS_WIN32S)) && IS_WIN32
  16. HINSTANCE hInst;   // current instance
  18. LPCTSTR lpszAppName  = "MyApp";
  19. LPCTSTR lpszTitle    = "My Application"; 
  21. BOOL RegisterWin95( CONST WNDCLASS* lpwc );
  23. int APIENTRY WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance,
  24.                       LPTSTR lpCmdLine, int nCmdShow)
  25. {
  26.    MSG      msg;
  27.    HWND     hWnd; 
  28.    WNDCLASS wc;
  30.    // Register the main application window class.
  31.    //............................................
  32.    wc.style         = CS_HREDRAW | CS_VREDRAW;
  33.    wc.lpfnWndProc   = (WNDPROC)WndProc;       
  34.    wc.cbClsExtra    = 0;                      
  35.    wc.cbWndExtra    = 0;                      
  36.    wc.hInstance     = hInstance;              
  37.    wc.hIcon         = LoadIcon( hInstance, lpszAppName ); 
  38.    wc.hCursor       = LoadCursor(NULL, IDC_ARROW);
  39.    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
  40.    wc.lpszMenuName  = lpszAppName;              
  41.    wc.lpszClassName = lpszAppName;              
  43.    if ( IS_WIN95 )
  44.    {
  45.       if ( !RegisterWin95( &wc ) )
  46.          return( FALSE );
  47.    }
  48.    else if ( !RegisterClass( &wc ) )
  49.       return( FALSE );
  51.    hInst = hInstance; 
  53.    // Create the main application window.
  54.    //....................................
  55.    hWnd = CreateWindow( lpszAppName, 
  56.                         lpszTitle,    
  57.                         WS_OVERLAPPEDWINDOW, 
  58.                         CW_USEDEFAULT, 0, 
  59.                         CW_USEDEFAULT, 0,  
  60.                         NULL,              
  61.                         NULL,              
  62.                         hInstance,         
  63.                         NULL               
  64.                       );
  66.    if ( !hWnd ) 
  67.       return( FALSE );
  69.    ShowWindow( hWnd, nCmdShow ); 
  70.    UpdateWindow( hWnd );         
  72.    while( GetMessage( &msg, NULL, 0, 0) )   
  73.    {
  74.       TranslateMessage( &msg ); 
  75.       DispatchMessage( &msg );  
  76.    }
  78.    return( msg.wParam ); 
  79. }
  82. BOOL RegisterWin95( CONST WNDCLASS* lpwc )
  83. {
  84.    WNDCLASSEX wcex;
  86.    wcex.style         = lpwc->style;
  87.    wcex.lpfnWndProc   = lpwc->lpfnWndProc;
  88.    wcex.cbClsExtra    = lpwc->cbClsExtra;
  89.    wcex.cbWndExtra    = lpwc->cbWndExtra;
  90.    wcex.hInstance     = lpwc->hInstance;
  91.    wcex.hIcon         = lpwc->hIcon;
  92.    wcex.hCursor       = lpwc->hCursor;
  93.    wcex.hbrBackground = lpwc->hbrBackground;
  94.    wcex.lpszMenuName  = lpwc->lpszMenuName;
  95.    wcex.lpszClassName = lpwc->lpszClassName;
  97.    // Added elements for Windows 95.
  98.    //...............................
  99.    wcex.cbSize = sizeof(WNDCLASSEX);
  100.    wcex.hIconSm = LoadImage(wcex.hInstance, lpwc->lpszClassName, 
  101.                             IMAGE_ICON, 16, 16,
  102.                             LR_DEFAULTCOLOR );
  104.    return RegisterClassEx( &wcex );
  105. }
  107. LPCTSTR lpBuffer = "This is the string that will be written to the file.";
  109. LRESULT CALLBACK WndProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam )
  110. {
  111. static HANDLE hFile;
  113.    switch( uMsg )
  114.    {
  115.       case WM_CREATE :
  116.               {
  117.                  DWORD dwWritten;
  119.                  // Open/create a file.
  120.                  //....................
  121.                  hFile = CreateFile( "FILE.DAT", GENERIC_READ | GENERIC_WRITE,
  122.                                      0, NULL, OPEN_ALWAYS,
  123.                                      FILE_ATTRIBUTE_NORMAL, NULL );
  125.                  // Write a string to the file.
  126.                  //............................
  127.                  WriteFile( hFile, lpBuffer, strlen( lpBuffer )+1, 
  128.                             &dwWritten, NULL );
  129.               }
  130.               break;
  132.       case WM_COMMAND :
  133.               switch( LOWORD( wParam ) )
  134.               {
  135.                  case IDM_TEST :
  136.                         {
  137.                            char  szBuf[128];
  138.                            DWORD dwRead;
  140.                            // Make sure the file pointer
  141.                            // is at the beginning of the file.
  142.                            //.................................
  143.                            SetFilePointer( hFile, 0, NULL, FILE_BEGIN );
  145.                            // Read the string from the file and display it.
  146.                            //..............................................
  147.                            if ( ReadFile( hFile, szBuf, strlen( lpBuffer )+1, 
  148.                                           &dwRead, NULL ) )
  149.                            {
  150.                               MessageBox( hWnd, szBuf, "Read File", MB_OK );
  151.                            }
  152.                         }
  153.                         break;
  155.                  case IDM_ABOUT :
  156.                         DialogBox( hInst, "AboutBox", hWnd, (DLGPROC)About );
  157.                         break;
  159.                  case IDM_EXIT :
  160.                         DestroyWindow( hWnd );
  161.                         break;
  162.               }
  163.               break;
  164.       
  165.       case WM_DESTROY :
  166.               // Close the file.
  167.               //................
  168.               CloseHandle( hFile );
  170.               PostQuitMessage(0);
  171.               break;
  173.       default :
  174.             return( DefWindowProc( hWnd, uMsg, wParam, lParam ) );
  175.    }
  177.    return( 0L );
  178. }
  181. LRESULT CALLBACK About( HWND hDlg,           
  182.                         UINT message,        
  183.                         WPARAM wParam,       
  184.                         LPARAM lParam)
  185. {
  186.    switch (message) 
  187.    {
  188.        case WM_INITDIALOG: 
  189.                return (TRUE);
  191.        case WM_COMMAND:                              
  192.                if (   LOWORD(wParam) == IDOK         
  193.                    || LOWORD(wParam) == IDCANCEL)    
  194.                {
  195.                        EndDialog(hDlg, TRUE);        
  196.                        return (TRUE);
  197.                }
  198.                break;
  199.    }
  201.    return (FALSE); 
  202. }