task_man.cpp

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本文介绍了一个使用C++编写的简单程序，该程序可以枚举Windows系统中所有顶级窗口，并显示它们的窗口名称和类名。通过`EnumWindows`函数遍历窗口，并利用`GetWindowText`和`GetClassName`获取相关信息。

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#include <windows.h>
#include "Task_Man.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 = "EnumWindows()";

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 );
}

BOOL CALLBACK EnumWndProc( HWND hWnd, LPARAM lParam )
{
static char szWindowName[71];
static char szClassName[31];
static char szAddString[101];

    // Get the window name and class name
    //...................................
    GetWindowText( hWnd, szWindowName, 70 );
    GetClassName( hWnd, szClassName, 30 );

    // Build a string and add it to the list box.
    //...........................................
    wsprintf( szAddString, "%s - %s", szClassName, szWindowName );

SendMessage( (HWND)lParam, LB_INSERTSTRING, (WPARAM)-1,
(LPARAM)(LPTSTR)szAddString );

return( TRUE );
}

LRESULT CALLBACK WndProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam )
{
static HWND hListBox;

   switch( uMsg )
   {
      case WM_CREATE :
               hListBox = CreateWindow( "LISTBOX", "",
                                       WS_CHILD | WS_BORDER |
                                       WS_VISIBLE | LBS_STANDARD,
                                       10, 10, 250, 100,
                                       hWnd, (HMENU) 101,
                                       hInst, NULL );
               break;

      case WM_COMMAND :
              switch( LOWORD( wParam ) )
              {
                 case IDM_TEST :
                        // Enumerate all top-level windows currently running
                        // and add their class names and window names to the
                        // hListBox.
                        //...................................................
                        EnumWindows((WNDENUMPROC)EnumWndProc,
                                    (LPARAM)(HANDLE)hListBox );
                        break;

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

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

      case WM_DESTROY :
              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);
}