Cet extrait de code est originaire de l'ancien site WinAPI www.winapi.net

Pour créer un lien dans une boîte de dialogue, vous devez ajouter un Texte à votre boîte de dialogue, qui seras utilisé en tant que lien. Attribuer le style Notification à ce contrôle de texte.

Nous utilisons le nom IDC_URL pour ce contrôle.

Maintenant, nous ajoutons le code suivant à votre procédure de dialogue. Après avoir cliqué sur le texte,vous allez être redirigé vers le site Web avec votre navigateur standard.

case WM_COMMAND:
    switch(LOWORD(wParam))
    {
        case IDC_URL:
            if(HIWORD(wParam) == STN_CLICKED)
            {
                ShellExecute(hWnd, NULL, TEXT("http://www.pellesc.de/"),
                          NULL, NULL, SW_SHOW);
            }
            return(TRUE);
     }

To get your link underlined, add the following code:

case WM_INITDIALOG:
    {
    LOGFONT lf;
 
    if(NULL == (hFont = (HFONT)SendDlgItemMessage(hWnd, IDC_URL, WM_GETFONT, 0, 0)))
        hFont = (HFONT)GetStockObject(SYSTEM_FONT);
 
    GetObject((HGDIOBJ)hFont, sizeof(lf), &lf);
    lf.lfUnderline = TRUE;
    hFont = CreateFontIndirect(&lf);
    SendDlgItemMessage(hWnd, IDC_URL, WM_SETFONT, (WPARAM)hFont, (LPARAM)TRUE);
    }
    return(TRUE);
 
case WM_NCDESTROY:
    if(hFont)
    {
        DeleteObject((HGDIOBJ)hFont);
     }
    break;

Don't forget to add a HFONT hFont to your dialog procedure!

To change the cursor you have to create at first a gobal variable:

WNDPROC g_wndpStatic;

Add the following code to your dialog procedure:

    g_wndpStatic = (WNDPROC)SetWindowLongPtr(GetDlgItem(hWnd, IDC_URL),
                               GWLP_WNDPROC, (LONG_PTR)UrlProc);

Now we only need the subclass procedure to react on the WM_SETCURSOR message:

LRESULT CALLBACK UrlProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch(uMsg)
    {
        case WM_SETCURSOR:
            SetCursor(LoadCursor(NULL, IDC_HAND));
            return(TRUE);
        default:
            break;
    }
return(CallWindowProc(g_wndpStatic, hWnd, uMsg, wParam, lParam));
}

Mostly, the URL links within a dialog are blue, so we have to change the text color:

case WM_CTLCOLORSTATIC:
   if(GetDlgItem(hWnd, IDC_URL) == (HWND)lParam)
   {
      SetTextColor((HDC)wParam, GetSysColor(COLOR_HIGHLIGHT));
      SetBkMode((HDC)wParam, TRANSPARENT);
      return((BOOL)GetStockObject(NULL_BRUSH));
   }
   break;

That's it. Now you have a link within your dialog like this:

LRESULT CALLBACK UrlProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch(uMsg)
    {
        case WM_SETCURSOR:
            SetCursor(LoadCursor(NULL, IDC_HAND));
            return(TRUE);
        default:
            break;
    }
return(CallWindowProc(g_wndpStatic, hWnd, uMsg, wParam, lParam));
}
 
LRESULT CALLBACK AboutDlgProc(HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
  HFONT hFont;
 
    switch (uMsg)
    {
        case WM_INITDIALOG:
            {
            LOGFONT lf;
 
            if(NULL == (hFont = (HFONT)SendDlgItemMessage(hDlg, IDC_URL, WM_GETFONT, 0, 0)))
                hFont = (HFONT)GetStockObject(SYSTEM_FONT);
 
            GetObject((HGDIOBJ)hFont, sizeof(lf), &lf);
            lf.lfUnderline = TRUE;
            hFont = CreateFontIndirect(&lf);
            SendDlgItemMessage(hDlg, IDC_URL, WM_SETFONT, (WPARAM)hFont, (LPARAM)TRUE);
 
            if(NULL == (hFont = (HFONT)SendDlgItemMessage(hDlg, IDC_APPNAME, WM_GETFONT, 0, 0)))
                hFont = (HFONT)GetStockObject(SYSTEM_FONT);
 
            GetObject((HGDIOBJ)hFont, sizeof(lf), &lf);
            lf.lfHeight = 16;
			lf.lfWeight = FW_BOLD;
            hFont = CreateFontIndirect(&lf);
            SendDlgItemMessage(hDlg, IDC_APPNAME, WM_SETFONT, (WPARAM)hFont, (LPARAM)TRUE);
 
            g_wndpStatic = (WNDPROC)SetWindowLongPtr(GetDlgItem(hDlg, IDC_URL),
                               GWLP_WNDPROC, (LONG_PTR)UrlProc);
            }
            return TRUE;
 
        case WM_COMMAND:
            switch (wParam)
            {
               case IDC_URL:
                  if(HIWORD(wParam) == STN_CLICKED)
                  {
                      ShellExecute(hDlg, NULL, TEXT("http://www.pellesc.de/"),
                                NULL, NULL, SW_SHOW);
                  }
                  return(TRUE);
 
                case IDOK:
                    EndDialog(hDlg, TRUE);
                    return TRUE;
            }
            break;
 
        case WM_CTLCOLORSTATIC:
           if(GetDlgItem(hDlg, IDC_URL) == (HWND)lParam)
           {
              SetTextColor((HDC)wParam, GetSysColor(COLOR_HOTLIGHT));
              SetBkMode((HDC)wParam, TRANSPARENT);
              return((BOOL)GetStockObject(NULL_BRUSH));
           }
           break;
 
        case WM_NCDESTROY:
            if(hFont)
            {
                DeleteObject((HGDIOBJ)hFont);
             }
            break;
 
    }
 
    return FALSE;
}