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Heap_Strings.cpp
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Heap_Strings.cpp：Code Content
  1. #include <windows.h>  
  2. #include "Heap_Strings.h" 
  5. #if defined (WIN32)
  6. #define IS_WIN32 TRUE
  7. #else
  8. #define IS_WIN32 FALSE
  9. #endif
  11. #define IS_NT      IS_WIN32 && (BOOL)(GetVersion() < 0x80000000)
  12. #define IS_WIN32S  IS_WIN32 && (BOOL)(!(IS_NT) && (LOBYTE(LOWORD(GetVersion()))<4))
  13. #define IS_WIN95   (BOOL)(!(IS_NT) && !(IS_WIN32S)) && IS_WIN32
  15. HINSTANCE hInst;   // current instance
  17. LPCTSTR lpszAppName  = "MyApp";
  18. LPCTSTR lpszTitle    = "My Application"; 
  20. #define BLOCKSIZE 32
  22. BOOL RegisterWin95( CONST WNDCLASS* lpwc );
  24. int APIENTRY WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance,
  25.                       LPTSTR lpCmdLine, int nCmdShow)
  26. {
  27.    MSG      msg;
  28.    HWND     hWnd; 
  29.    WNDCLASS wc;
  31.    // Register the main application window class.
  32.    //............................................
  33.    wc.style         = CS_HREDRAW | CS_VREDRAW;
  34.    wc.lpfnWndProc   = (WNDPROC)WndProc;       
  35.    wc.cbClsExtra    = 0;                      
  36.    wc.cbWndExtra    = 0;                      
  37.    wc.hInstance     = hInstance;              
  38.    wc.hIcon         = LoadIcon( hInstance, lpszAppName ); 
  39.    wc.hCursor       = LoadCursor(NULL, IDC_ARROW);
  40.    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
  41.    wc.lpszMenuName  = lpszAppName;              
  42.    wc.lpszClassName = lpszAppName;              
  44.    if ( IS_WIN95 )
  45.    {
  46.       if ( !RegisterWin95( &wc ) )
  47.          return( FALSE );
  48.    }
  49.    else if ( !RegisterClass( &wc ) )
  50.       return( FALSE );
  52.    hInst = hInstance; 
  54.    // Create the main application window.
  55.    //....................................
  56.    hWnd = CreateWindow( lpszAppName, 
  57.                         lpszTitle,    
  58.                         WS_OVERLAPPEDWINDOW, 
  59.                         CW_USEDEFAULT, 0, 
  60.                         CW_USEDEFAULT, 0,  
  61.                         NULL,              
  62.                         NULL,              
  63.                         hInstance,         
  64.                         NULL               
  65.                       );
  67.    if ( !hWnd ) 
  68.       return( FALSE );
  70.    ShowWindow( hWnd, nCmdShow ); 
  71.    UpdateWindow( hWnd );         
  73.    while( GetMessage( &msg, NULL, 0, 0) )   
  74.    {
  75.       TranslateMessage( &msg ); 
  76.       DispatchMessage( &msg );  
  77.    }
  79.    return( msg.wParam ); 
  80. }
  83. BOOL RegisterWin95( CONST WNDCLASS* lpwc )
  84. {
  85.    WNDCLASSEX wcex;
  87.    wcex.style         = lpwc->style;
  88.    wcex.lpfnWndProc   = lpwc->lpfnWndProc;
  89.    wcex.cbClsExtra    = lpwc->cbClsExtra;
  90.    wcex.cbWndExtra    = lpwc->cbWndExtra;
  91.    wcex.hInstance     = lpwc->hInstance;
  92.    wcex.hIcon         = lpwc->hIcon;
  93.    wcex.hCursor       = lpwc->hCursor;
  94.    wcex.hbrBackground = lpwc->hbrBackground;
  95.    wcex.lpszMenuName  = lpwc->lpszMenuName;
  96.    wcex.lpszClassName = lpwc->lpszClassName;
  98.    // Added elements for Windows 95.
  99.    //...............................
  100.    wcex.cbSize = sizeof(WNDCLASSEX);
  101.    wcex.hIconSm = LoadImage(wcex.hInstance, lpwc->lpszClassName, 
  102.                             IMAGE_ICON, 16, 16,
  103.                             LR_DEFAULTCOLOR );
  105.    return RegisterClassEx( &wcex );
  106. }
  108. LRESULT CALLBACK WndProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam )
  109. {
  110. static LPTSTR* lpStrList;
  111. static int     nBlocks;
  112. static int     nStrings;
  113. static HANDLE  hHeap     = NULL;
  115.    switch( uMsg )
  116.    {
  117.       case WM_CREATE  : 
  118.               hHeap     = HeapCreate( 0, 1024, 0 );
  119.               lpStrList = HeapAlloc( hHeap, HEAP_ZERO_MEMORY, 
  120.                                      sizeof( LPTSTR )*BLOCKSIZE );
  121.               nBlocks   = 1;
  122.               nStrings  = 0;
  123.               break;
  125.       case WM_COMMAND :
  126.               switch( LOWORD( wParam ) )
  127.               {
  128.                  case IDM_ALLOCATE :
  129.                         {
  130.                            // If there is no room in the array then allocate
  131.                            // more space to store the new item in.
  132.                            //.....................................
  133.                            if ( nStrings == nBlocks*BLOCKSIZE )
  134.                            {
  135.                               nBlocks++;
  136.                               lpStrList = HeapReAlloc( hHeap, HEAP_ZERO_MEMORY, 
  137.                                                        lpStrList, 
  138.                                                        sizeof( LPTSTR )
  139.                                                        *BLOCKSIZE*nBlocks );
  141.                            }
  143.                            *(lpStrList+nStrings) = HeapAlloc( hHeap,
  144.                                                       HEAP_ZERO_MEMORY, 12 );
  145.                            strcpy( *(lpStrList+nStrings), "Test String" );
  146.                            nStrings++;
  148.                         }
  149.                         break;
  151.                  case IDM_FREE :
  152.                         if ( nStrings > 0 )
  153.                         {
  154.                            nStrings--;
  155.                            HeapFree( hHeap, 0, *(lpStrList+nStrings) );
  157.                            if ( nStrings < (nBlocks-1)*BLOCKSIZE )
  158.                            {
  159.                               nBlocks--;
  160.                               lpStrList = HeapReAlloc( hHeap, 0, 
  161.                                                        lpStrList, 
  162.                                                        sizeof( LPTSTR )
  163.                                                        *BLOCKSIZE*nBlocks );
  164.                            }
  165.                         }
  166.                         break;
  168.                  case IDM_ABOUT :
  169.                         DialogBox( hInst, "AboutBox", hWnd, (DLGPROC)About );
  170.                         break;
  172.                  case IDM_EXIT :
  173.                         DestroyWindow( hWnd );
  174.                         break;
  175.               }
  176.               break;
  177.       
  178.       case WM_DESTROY :
  179.               HeapDestroy( hHeap );
  180.               PostQuitMessage(0);
  181.               break;
  183.       default :
  184.             return( DefWindowProc( hWnd, uMsg, wParam, lParam ) );
  185.    }
  187.    return( 0L );
  188. }
  191. LRESULT CALLBACK About( HWND hDlg,           
  192.                         UINT message,        
  193.                         WPARAM wParam,       
  194.                         LPARAM lParam)
  195. {
  196.    switch (message) 
  197.    {
  198.        case WM_INITDIALOG: 
  199.                return (TRUE);
  201.        case WM_COMMAND:                              
  202.                if (   LOWORD(wParam) == IDOK         
  203.                    || LOWORD(wParam) == IDCANCEL)    
  204.                {
  205.                        EndDialog(hDlg, TRUE);        
  206.                        return (TRUE);
  207.                }
  208.                break;
  209.    }
  211.    return (FALSE); 
  212. }