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/ Windows 95 API Bible / Windows 95 API Bible 3 Disc Set.iso / Win32 API Bible Book 1 of 3 / CHAPTE16 / GETPALEN.C < prev    next >
C/C++ Source or Header  |  1996-01-31  |  9KB  |  260 lines
  1.  
  2. #include <windows.h>  
  3. #include "GetPalEn.h" 
  4.  
  5.  
  6. #if defined (WIN32)
  7.     #define IS_WIN32 TRUE
  8. #else
  9.     #define IS_WIN32 FALSE
  10. #endif
  11.  
  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
  15.  
  16. HINSTANCE hInst;   // current instance
  17.  
  18. LPCTSTR lpszAppName  = "MyApp";
  19. LPCTSTR lpszTitle    = "My Application"; 
  20.  
  21. BOOL RegisterWin95( CONST WNDCLASS* lpwc );
  22.  
  23. int APIENTRY WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance,
  24.                       LPTSTR lpCmdLine, int nCmdShow)
  25. {
  26.    MSG      msg;
  27.    HWND     hWnd; 
  28.    WNDCLASS wc;
  29.  
  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;              
  42.  
  43.    if ( IS_WIN95 )
  44.    {
  45.       if ( !RegisterWin95( &wc ) )
  46.          return( FALSE );
  47.    }
  48.    else if ( !RegisterClass( &wc ) )
  49.       return( FALSE );
  50.  
  51.    hInst = hInstance; 
  52.  
  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.                       );
  65.  
  66.    if ( !hWnd ) 
  67.       return( FALSE );
  68.  
  69.    ShowWindow( hWnd, nCmdShow ); 
  70.    UpdateWindow( hWnd );         
  71.  
  72.    while( GetMessage( &msg, NULL, 0, 0) )   
  73.    {
  74.       TranslateMessage( &msg ); 
  75.       DispatchMessage( &msg );  
  76.    }
  77.  
  78.    return( msg.wParam ); 
  79. }
  80.  
  81.  
  82. BOOL RegisterWin95( CONST WNDCLASS* lpwc )
  83. {
  84.    WNDCLASSEX wcex;
  85.  
  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;
  96.  
  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 );
  103.             
  104.    return RegisterClassEx( &wcex );
  105. }
  106.  
  107. static HPALETTE hPal;
  108.  
  109. LRESULT CALLBACK WndProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam )
  110. {
  111.    switch( uMsg )
  112.    {
  113.        case WM_CREATE : 
  114.                {
  115.                   LPLOGPALETTE pLogPal;
  116.                   int          i;
  117.  
  118.                   // Allocate space for palette entries.
  119.                   //....................................
  120.                   pLogPal = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY,
  121.                                        sizeof( LOGPALETTE ) +
  122.                                        (16*sizeof( PALETTEENTRY )) );
  123.  
  124.                   // Initialize palette entries with 15 shades of gray.
  125.                   //...................................................
  126.                   pLogPal->palVersion    = 0x300;
  127.                   pLogPal->palNumEntries = 16;
  128.  
  129.                   for ( i = 0; i < 15; i++ )
  130.                   {
  131.                      pLogPal->palPalEntry[i].peRed   = 255 - (i*15);
  132.                      pLogPal->palPalEntry[i].peGreen = 255 - (i*15);
  133.                      pLogPal->palPalEntry[i].peBlue  = 255 - (i*15);
  134.                      pLogPal->palPalEntry[i].peFlags = PC_RESERVED;
  135.                   }
  136.  
  137.                   // Set black palette entry.
  138.                   //.........................
  139.                   pLogPal->palPalEntry[i].peRed   = 0;
  140.                   pLogPal->palPalEntry[i].peGreen = 0;
  141.                   pLogPal->palPalEntry[i].peBlue  = 0;
  142.                   pLogPal->palPalEntry[i].peFlags = PC_RESERVED;
  143.  
  144.                   // Create palette.
  145.                   //................
  146.                   hPal = CreatePalette( pLogPal );
  147.                   HeapFree( GetProcessHeap(), 0, pLogPal );
  148.                }
  149.                break;
  150.  
  151.        case WM_PAINT :
  152.                {
  153.                   PAINTSTRUCT ps;
  154.                   HBRUSH      hBrush;
  155.                   int         i, nNumColors;
  156.  
  157.                   BeginPaint( hWnd, &ps );
  158.  
  159.                   nNumColors = GetPaletteEntries( hPal, 0 , 0, NULL );
  160.  
  161.                   // Select and realize palette.
  162.                   //............................
  163.                   SelectPalette( ps.hdc, hPal, FALSE );
  164.                   RealizePalette( ps.hdc );
  165.  
  166.                   SelectObject( ps.hdc, GetStockObject( NULL_PEN ) );
  167.  
  168.                   // Paint a sample of each color in the palette.
  169.                   //.............................................
  170.                   for ( i = 0; i < nNumColors; i++ )
  171.                   {
  172.                       hBrush = CreateSolidBrush( PALETTEINDEX( i ) );
  173.                       SelectObject( ps.hdc, hBrush );
  174.                       Rectangle( ps.hdc, i*10, 0, (i*10)+11, 50 );
  175.                       SelectObject( ps.hdc, GetStockObject( WHITE_BRUSH ) );
  176.                       DeleteObject( hBrush );
  177.                   }
  178.  
  179.                   EndPaint( hWnd, &ps );
  180.                }
  181.                break;
  182.  
  183.       case WM_COMMAND :
  184.               switch( LOWORD( wParam ) )
  185.               {
  186.                  case IDM_TEST :
  187.                          {
  188.                             LPLOGPALETTE pLogPal;
  189.        
  190.                             pLogPal = HeapAlloc( GetProcessHeap(), 
  191.                                            HEAP_ZERO_MEMORY,
  192.                                            sizeof( LOGPALETTE ) +
  193.                                            (5*sizeof( PALETTEENTRY )) );
  194.  
  195.                             // Retrieve a subset of the palette entries.
  196.                             //..........................................
  197.                             GetPaletteEntries( hPal, 2, 5, 
  198.                                                pLogPal->palPalEntry );
  199.  
  200.                             pLogPal->palVersion    = 0x300;
  201.                             pLogPal->palNumEntries = 5;
  202.  
  203.                             DeleteObject( hPal );
  204.  
  205.                             // Create a new palette with the
  206.                             // smaller number of entries.
  207.                             //..............................
  208.                             hPal = CreatePalette( pLogPal );
  209.                             HeapFree( GetProcessHeap(), 0, pLogPal );
  210.  
  211.                             InvalidateRect( hWnd, NULL, TRUE );
  212.                          }
  213.                          break;
  214.  
  215.                  case IDM_ABOUT :
  216.                         DialogBox( hInst, "AboutBox", hWnd, (DLGPROC)About );
  217.                         break;
  218.  
  219.                  case IDM_EXIT :
  220.                         DestroyWindow( hWnd );
  221.                         break;
  222.               }
  223.               break;
  224.       
  225.       case WM_DESTROY :
  226.               DeleteObject( hPal );
  227.               PostQuitMessage(0);
  228.               break;
  229.  
  230.       default :
  231.             return( DefWindowProc( hWnd, uMsg, wParam, lParam ) );
  232.    }
  233.  
  234.    return( 0L );
  235. }
  236.  
  237.  
  238. LRESULT CALLBACK About( HWND hDlg,           
  239.                         UINT message,        
  240.                         WPARAM wParam,       
  241.                         LPARAM lParam)
  242. {
  243.    switch (message) 
  244.    {
  245.        case WM_INITDIALOG: 
  246.                return (TRUE);
  247.  
  248.        case WM_COMMAND:                              
  249.                if (   LOWORD(wParam) == IDOK         
  250.                    || LOWORD(wParam) == IDCANCEL)    
  251.                {
  252.                        EndDialog(hDlg, TRUE);        
  253.                        return (TRUE);
  254.                }
  255.                break;
  256.    }
  257.  
  258.    return (FALSE); 
  259. }
  260.