change_colors.cpp

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本文介绍了一个使用Windows API进行编程的应用实例，涉及窗口类注册、消息循环处理、位图操作及对话框处理等内容。通过具体代码展示了如何创建窗口、绘制位图以及响应用户命令。

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#include <windows.h>
#include "Change_Colors.h"

#if defined (WIN32)
#define IS_WIN32 TRUE
#else
#define IS_WIN32 FALSE
#endif

#define IS_NT IS_WIN32 && (BOOL)(GetVersion() < 0x80000000)
#define IS_WIN32S IS_WIN32 && (BOOL)(!(IS_NT) && (LOBYTE(LOWORD(GetVersion()))<4))
#define IS_WIN95 (BOOL)(!(IS_NT) && !(IS_WIN32S)) && IS_WIN32

HINSTANCE hInst; // current instance

LPCTSTR lpszAppName = "MyApp";
LPCTSTR lpszTitle = "My Application";

BOOL RegisterWin95( CONST WNDCLASS* lpwc );

int APIENTRY WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance,
                      LPTSTR lpCmdLine, int nCmdShow)
{
   MSG      msg;
   HWND     hWnd;
   WNDCLASS wc;

   // Register the main application window class.
   //............................................
   wc.style         = CS_HREDRAW | CS_VREDRAW;
   wc.lpfnWndProc   = (WNDPROC)WndProc;
   wc.cbClsExtra    = 0;
   wc.cbWndExtra    = 0;
   wc.hInstance     = hInstance;
   wc.hIcon         = LoadIcon( hInstance, lpszAppName );
   wc.hCursor       = LoadCursor(NULL, IDC_ARROW);
   wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
   wc.lpszMenuName = lpszAppName;
   wc.lpszClassName = lpszAppName;

   if ( IS_WIN95 )
   {
      if ( !RegisterWin95( &wc ) )
         return( FALSE );
   }
   else if ( !RegisterClass( &wc ) )
      return( FALSE );

hInst = hInstance;

   // Create the main application window.
   //....................................
   hWnd = CreateWindow( lpszAppName,
                        lpszTitle,
                        WS_OVERLAPPEDWINDOW,
                        CW_USEDEFAULT, 0,
                        CW_USEDEFAULT, 0,
                        NULL,
                        NULL,
                        hInstance,
                        NULL
                      );

if ( !hWnd )
return( FALSE );

ShowWindow( hWnd, nCmdShow );
UpdateWindow( hWnd );

   while( GetMessage( &msg, NULL, 0, 0) )
   {
      TranslateMessage( &msg );
      DispatchMessage( &msg );
   }

return( msg.wParam );
}

BOOL RegisterWin95( CONST WNDCLASS* lpwc )
{
WNDCLASSEX wcex;

   wcex.style         = lpwc->style;
   wcex.lpfnWndProc   = lpwc->lpfnWndProc;
   wcex.cbClsExtra    = lpwc->cbClsExtra;
   wcex.cbWndExtra    = lpwc->cbWndExtra;
   wcex.hInstance     = lpwc->hInstance;
   wcex.hIcon         = lpwc->hIcon;
   wcex.hCursor       = lpwc->hCursor;
   wcex.hbrBackground = lpwc->hbrBackground;
   wcex.lpszMenuName = lpwc->lpszMenuName;
   wcex.lpszClassName = lpwc->lpszClassName;

   // Added elements for Windows 95.
   //...............................
   wcex.cbSize = sizeof(WNDCLASSEX);
   wcex.hIconSm = LoadImage(wcex.hInstance, lpwc->lpszClassName,
                            IMAGE_ICON, 16, 16,
                            LR_DEFAULTCOLOR );

   return RegisterClassEx( &wcex );
}

#define ALIGNLONG(i) ((i+3)/4*4)
#define WIDTH        50
#define HEIGHT       50
#define COLORBITS    4

LRESULT CALLBACK WndProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam )
{
static HBITMAP hBitmap;
static LPBITMAPINFOHEADER lpbi;
static BITMAPINFOHEADER bi;

   switch( uMsg )
   {
      case WM_CREATE :
               {
                  HDC    hDC, hMemDC;
                  LPTSTR lpstBitmap;

                  hDC = GetDC (hWnd) ;

                  // Intialize BITMAPINFOHEADER data.
                  //.................................
                  bi.biSize     = sizeof (BITMAPINFOHEADER) ;
                  bi.biWidth    = WIDTH;
                  bi.biHeight   = HEIGHT;
                  bi.biPlanes   = 1;
                  bi.biBitCount = COLORBITS;
                  bi.biCompression = BI_RGB;
                  bi.biSizeImage = ( ALIGNLONG( (WIDTH * COLORBITS)/8 )
                                         * HEIGHT);
                  bi.biXPelsPerMeter = 0;
                  bi.biYPelsPerMeter = 0;
                  bi.biClrUsed       = 0;
                  bi.biClrImportant = 0;

                  // Create uninitialized DIB bitmap.
                  //.................................
                  hBitmap = CreateDIBitmap( hDC, &bi, 0L, NULL,
                                            NULL, 0);

                  // Allocate memory for BITMAPINFO structure.
                  //..........................................
                  lpbi = (BITMAPINFOHEADER*)GlobalAlloc( GPTR,
                                       sizeof(BITMAPINFOHEADER) +
                                       16 * sizeof (RGBQUAD) +
                                       (ALIGNLONG((WIDTH * COLORBITS)/8)
                                       * HEIGHT) );

                  // Copy BITMAPINFOHEADER information.
                  //...................................
                  *lpbi = bi;

                  // Initialize structure data with GetDIBits().
                  //............................................
                  GetDIBits( hDC, hBitmap, 0, 50, NULL,
                            (LPBITMAPINFO) lpbi, DIB_RGB_COLORS);

                  // Create memory device context and select bitmap.
                  //................................................
                  hMemDC = CreateCompatibleDC( hDC );

                  SelectObject( hMemDC, hBitmap );

                  // Paint on memory device context.
                  //................................
                  SelectObject( hMemDC, GetStockObject(BLACK_BRUSH) );
                  Rectangle (hMemDC, 0, 0, WIDTH, HEIGHT);

                  SelectObject( hMemDC, GetStockObject(WHITE_BRUSH) ) ;
                  Ellipse( hMemDC, 0, 0, WIDTH, HEIGHT );
                  MoveToEx( hMemDC, 0, 0, NULL );
                  LineTo( hMemDC, WIDTH / 2, HEIGHT / 2 );
                  LineTo( hMemDC, WIDTH, 0 );

                  // Set pointer to bitmap抯 bit data.
                  //..................................
                  lpstBitmap = (LPSTR)lpbi + (WORD)sizeof(BITMAPINFOHEADER) +
                                             (16 * sizeof(RGBQUAD));

GetDIBits( hDC, hBitmap, 0, HEIGHT, lpstBitmap,
(LPBITMAPINFO) lpbi, DIB_RGB_COLORS);

                  DeleteDC( hMemDC );
                  ReleaseDC( hWnd, hDC);
               }
               break;

      case WM_PAINT :
               {
                  PAINTSTRUCT ps;
                  HDC         hMemDC;

BeginPaint( hWnd, &ps );
hMemDC = CreateCompatibleDC( ps.hdc );

                  SelectObject( hMemDC, hBitmap );
                  BitBlt( ps.hdc, 10, 10, WIDTH, HEIGHT,
                          hMemDC, 0, 0, SRCCOPY );

                  DeleteDC( hMemDC );
                  EndPaint( hWnd, &ps );
               }
               break;

      case WM_COMMAND :
              switch( LOWORD( wParam ) )
              {
                 case IDM_TEST :
                        {
                           HDC    hDC;
                           int    nBytes, i;
                           LPTSTR lpstBitmap, lpstTemp;

hDC = GetDC( hWnd );

                           lpstBitmap = (LPSTR)lpbi +
                                        (WORD) sizeof(BITMAPINFOHEADER) +
                                         (16 * sizeof (RGBQUAD));

nBytes = ALIGNLONG((WIDTH * COLORBITS)/8)
* HEIGHT;

                           lpstTemp = lpstBitmap;

                           // Change 0 bytes to 0x2C in bitmap data.
                           //........................................
                           for( i = 0; i < nBytes; i++ )
                           {
                              if ( 0 == *lpstTemp )
                                 *lpstTemp = 0x2C;

lpstTemp++;
}

                           // Make the changes to the bitmap.
                           //................................
                           SetDIBits( hDC, hBitmap, 0, HEIGHT, lpstBitmap,
                                      (LPBITMAPINFO) lpbi, DIB_RGB_COLORS );

ReleaseDC( hWnd, hDC );

                           InvalidateRect( hWnd, NULL, TRUE );
                           UpdateWindow( hWnd );
                        }
                        break;

                 case IDM_ABOUT :
                        DialogBox( hInst, "AboutBox", hWnd, (DLGPROC)About );
                        break;

                 case IDM_EXIT :
                        DestroyWindow( hWnd );
                        break;
              }
              break;

      case WM_DESTROY :
              GlobalFree( lpbi );
              PostQuitMessage(0);
              break;

      default :
            return( DefWindowProc( hWnd, uMsg, wParam, lParam ) );
   }

return( 0L );
}

LRESULT CALLBACK About( HWND hDlg,
                        UINT message,
                        WPARAM wParam,
                        LPARAM lParam)
{
   switch (message)
   {
       case WM_INITDIALOG:
               return (TRUE);

       case WM_COMMAND:
               if (   LOWORD(wParam) == IDOK
                   || LOWORD(wParam) == IDCANCEL)
               {
                       EndDialog(hDlg, TRUE);
                       return (TRUE);
               }
               break;
   }

return (FALSE);
}