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/ Windows 95 API Bible / Windows 95 API Bible 3 Disc Set.iso / Win32 API Bible Book 2 of 3.iso / chapte10 / conlist.c < prev    next >
C/C++ Source or Header  |  1996-03-06  |  8KB  |  255 lines
  1.  
  2. #include <windows.h>  
  3. #include "conlist.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   = "DdeConnectList()"; 
  20.  
  21.  
  22. BOOL RegisterWin95( CONST WNDCLASS* lpwc );
  23.  
  24.  
  25. int APIENTRY WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance,
  26.                       LPTSTR lpCmdLine, int nCmdShow)
  27. {
  28.    MSG      msg;
  29.    HWND     hWnd; 
  30.    WNDCLASS wc;
  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.    hWnd = CreateWindow( lpszAppName, 
  54.                         lpszTitle,    
  55.                         WS_OVERLAPPEDWINDOW, 
  56.                         CW_USEDEFAULT, 0, 
  57.                         CW_USEDEFAULT, 0,  
  58.                         NULL,              
  59.                         NULL,              
  60.                         hInstance,         
  61.                         NULL               
  62.                       );
  63.  
  64.    if ( !hWnd ) 
  65.       return( FALSE );
  66.  
  67.    ShowWindow( hWnd, nCmdShow ); 
  68.    UpdateWindow( hWnd );         
  69.  
  70.    while( GetMessage( &msg, NULL, 0, 0) )   
  71.    {
  72.       TranslateMessage( &msg ); 
  73.       DispatchMessage( &msg );  
  74.    }
  75.  
  76.    return( msg.wParam ); 
  77. }
  78.  
  79.  
  80. BOOL RegisterWin95( CONST WNDCLASS* lpwc )
  81. {
  82.    WNDCLASSEX wcex;
  83.  
  84.    wcex.style         = lpwc->style;
  85.    wcex.lpfnWndProc   = lpwc->lpfnWndProc;
  86.    wcex.cbClsExtra    = lpwc->cbClsExtra;
  87.    wcex.cbWndExtra    = lpwc->cbWndExtra;
  88.    wcex.hInstance     = lpwc->hInstance;
  89.    wcex.hIcon         = lpwc->hIcon;
  90.    wcex.hCursor       = lpwc->hCursor;
  91.    wcex.hbrBackground = lpwc->hbrBackground;
  92.    wcex.lpszMenuName  = lpwc->lpszMenuName;
  93.    wcex.lpszClassName = lpwc->lpszClassName;
  94.  
  95.    // Added elements for Windows 95.
  96.    //...............................
  97.    wcex.cbSize = sizeof(WNDCLASSEX);
  98.    wcex.hIconSm = LoadImage(wcex.hInstance, lpwc->lpszClassName, 
  99.                             IMAGE_ICON, 16, 16,
  100.                             LR_DEFAULTCOLOR );
  101.             
  102.    return RegisterClassEx( &wcex );
  103. }
  104.  
  105. HDDEDATA CALLBACK DdemlCallback( UINT     uType,
  106.                                  UINT     uFmt,    
  107.                                  HCONV    hconv,    
  108.                                  HSZ      hsz1,    
  109.                                  HSZ      hsz2,    
  110.                                  HDDEDATA hdata,    
  111.                                  DWORD    dwData1,
  112.                                  DWORD    dwData2 );
  113.  
  114.  
  115.  
  116. LRESULT CALLBACK WndProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam )
  117. {
  118. static DWORD     ddeInst    = 0;
  119. static HSZ       hszTopic   = NULL;
  120. static HCONVLIST hConvList  = NULL;
  121. static HWND      hList      = NULL;
  122.  
  123.    switch( uMsg )
  124.    {
  125.       case WM_CREATE :
  126.               // Initialize DDEML.
  127.               //..................
  128.               if ( DdeInitialize( &ddeInst, DdemlCallback, 
  129.                    APPCMD_CLIENTONLY, 0 ) != DMLERR_NO_ERROR )
  130.               {
  131.                  MessageBox( hWnd, "Could not initialize DDEML.", 
  132.                              NULL, MB_OK | MB_ICONSTOP );
  133.                  return( -1 );
  134.               }
  135.  
  136.               // Allocate strings.
  137.               //..................
  138.               hszTopic = DdeCreateStringHandle( ddeInst,"System",CP_WINANSI );
  139.  
  140.               hList = CreateWindow( "LISTBOX", "",    
  141.                                     WS_CHILD | LBS_STANDARD | 
  142.                                     WS_VISIBLE | LBS_NOINTEGRALHEIGHT, 
  143.                                     0, 0, 
  144.                                     0, 0,  
  145.                                     hWnd,              
  146.                                     (HMENU)101,              
  147.                                     hInst,         
  148.                                     NULL               
  149.                                   );
  150.               break;
  151.  
  152.       case WM_SIZE :
  153.               MoveWindow( hList, 0, 0, LOWORD( lParam ), HIWORD( lParam ), TRUE );
  154.               break; 
  155.  
  156.       case WM_COMMAND :
  157.               switch( LOWORD( wParam ) )
  158.               {
  159.                  case IDM_TEST :
  160.                         // Connect to all servers that support "System".
  161.                         //..............................................
  162.                         hConvList = DdeConnectList( ddeInst, NULL, hszTopic, NULL, NULL );
  163.  
  164.                         if ( DdeGetLastError( ddeInst ) != DMLERR_NO_ERROR )
  165.                         {
  166.                            MessageBox( hWnd, "Could not connect to servers.", 
  167.                                              NULL, MB_OK | MB_ICONSTOP );
  168.                         }
  169.                         else
  170.                         {
  171.                            CONVINFO ConvInfo;
  172.                            char     szService[31];
  173.                            HCONV    hConv = NULL;
  174.  
  175.                            ConvInfo.cb = sizeof( CONVINFO );
  176.                            SendMessage( hList, LB_RESETCONTENT, 0, 0 );
  177.  
  178.                            // Find out all the servers we connected to
  179.                            // and display them in the list box.
  180.                            //.........................................
  181.                            while( hConv = DdeQueryNextServer( hConvList, hConv ) )
  182.                            {
  183.                               DdeQueryConvInfo( hConv, QID_SYNC, &ConvInfo );
  184.                               DdeQueryString( ddeInst, ConvInfo.hszSvcPartner,
  185.                                               szService, 30, CP_WINANSI );
  186.  
  187.                               SendMessage( hList, LB_ADDSTRING, 0, (LPARAM)szService );
  188.                            }
  189.  
  190.                            // Disconnect from all servers.
  191.                            //.............................
  192.                            DdeDisconnectList( hConvList );
  193.                         }
  194.                         break;
  195.  
  196.                  case IDM_ABOUT :
  197.                         DialogBox( hInst, "AboutBox", hWnd, (DLGPROC)About );
  198.                         break;
  199.  
  200.                  case IDM_EXIT :
  201.                         DestroyWindow( hWnd );
  202.                         break;
  203.               }
  204.               break;
  205.       
  206.       case WM_DESTROY :
  207.               DdeFreeStringHandle( ddeInst, hszTopic );
  208.               DdeUninitialize( ddeInst );
  209.               PostQuitMessage(0);
  210.               break;
  211.  
  212.       default :
  213.             return( DefWindowProc( hWnd, uMsg, wParam, lParam ) );
  214.    }
  215.  
  216.    return( 0L );
  217. }
  218.  
  219.  
  220. HDDEDATA CALLBACK DdemlCallback( UINT     uType,
  221.                                  UINT     uFmt,    
  222.                                  HCONV    hconv,    
  223.                                  HSZ      hsz1,    
  224.                                  HSZ      hsz2,    
  225.                                  HDDEDATA hdata,    
  226.                                  DWORD    dwData1,
  227.                                  DWORD    dwData2 )
  228. {
  229.    return( NULL );
  230. }
  231.  
  232.  
  233. LRESULT CALLBACK About( HWND hDlg,           
  234.                         UINT message,        
  235.                         WPARAM wParam,       
  236.                         LPARAM lParam)
  237. {
  238.    switch (message) 
  239.    {
  240.        case WM_INITDIALOG: 
  241.                return (TRUE);
  242.  
  243.        case WM_COMMAND:                              
  244.                if (   LOWORD(wParam) == IDOK         
  245.                    || LOWORD(wParam) == IDCANCEL)    
  246.                {
  247.                        EndDialog(hDlg, TRUE);        
  248.                        return (TRUE);
  249.                }
  250.                break;
  251.    }
  252.  
  253.    return (FALSE); 
  254. }
  255.