netconnect.cpp

游戏编程精华02－含有几十个游戏编程例子

    if( nItemSelected != LB_ERR )
    {
        pDPHostEnumSelected = (DPHostEnumInfo*) SendMessage( hWndListBox, LB_GETITEMDATA,
                                                             nItemSelected, 0 );
        if( pDPHostEnumSelected != NULL && pDPHostEnumSelected->bValid )
        {
            guidSelectedInstance = pDPHostEnumSelected->pAppDesc->guidInstance;
            bFindSelectedGUID = TRUE;
        }
    }

    // Tell listbox not to redraw itself since the contents are going to change
    SendMessage( hWndListBox, WM_SETREDRAW, FALSE, 0 );

    // Test to see if any sessions exist in the linked list
    DPHostEnumInfo* pDPHostEnum = m_DPHostEnumHead.pNext;
    while ( pDPHostEnum != &m_DPHostEnumHead )
    {
        if( pDPHostEnum->bValid )
            break;
        pDPHostEnum = pDPHostEnum->pNext;
    }

    // If there are any sessions in list,
    // then add them to the listbox
    if( pDPHostEnum != &m_DPHostEnumHead )
    {
        // Clear the contents from the list box and enable the join button
        SendMessage( hWndListBox, LB_RESETCONTENT, 0, 0 );

        // Enable the join button only if not already connecting to a game
        if( !m_bConnecting )
            EnableWindow( GetDlgItem( hDlg, IDC_JOIN ), TRUE );

        pDPHostEnum = m_DPHostEnumHead.pNext;
        while ( pDPHostEnum != &m_DPHostEnumHead )
        {
            // Add host to list box if it is valid
            if( pDPHostEnum->bValid )
            {
                int nIndex = (int)SendMessage( hWndListBox, LB_ADDSTRING, 0,
                                               (LPARAM)pDPHostEnum->szSession );
                SendMessage( hWndListBox, LB_SETITEMDATA, nIndex, (LPARAM)pDPHostEnum );

                if( bFindSelectedGUID )
                {
                    // Look for the session the was selected before
                    if( pDPHostEnum->pAppDesc->guidInstance == guidSelectedInstance )
                    {
                        SendMessage( hWndListBox, LB_SETCURSEL, nIndex, 0 );
                        bFoundSelectedGUID = TRUE;
                    }
                }
            }

            pDPHostEnum = pDPHostEnum->pNext;
        }

        if( !bFindSelectedGUID || !bFoundSelectedGUID )
            SendMessage( hWndListBox, LB_SETCURSEL, 0, 0 );
    }
    else
    {
        // There are no active session, so just reset the listbox
        SessionsDlgInitListbox( hDlg );
    }

    // Tell listbox to redraw itself now since the contents have changed
    SendMessage( hWndListBox, WM_SETREDRAW, TRUE, 0 );
    InvalidateRect( hWndListBox, NULL, FALSE );

    LeaveCriticalSection( &m_csHostEnum );

    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: SessionsDlgJoinGame()
// Desc: Joins the selected DirectPlay session
//-----------------------------------------------------------------------------
HRESULT CNetConnectWizard::SessionsDlgJoinGame( HWND hDlg )
{
    HRESULT         hr;
    HWND            hWndListBox = GetDlgItem( hDlg, IDC_GAMES_LIST );
    DPHostEnumInfo* pDPHostEnumSelected = NULL;
    int             nItemSelected;
    DWORD           dwPort = 0;

    m_bHostPlayer = FALSE;

    // Add status text in list box
    nItemSelected = (int)SendMessage( hWndListBox, LB_GETCURSEL, 0, 0 );

    EnterCriticalSection( &m_csHostEnum );

    pDPHostEnumSelected = (DPHostEnumInfo*) SendMessage( hWndListBox, LB_GETITEMDATA,
                                                         nItemSelected, 0 );

    if( NULL == pDPHostEnumSelected )
    {
        LeaveCriticalSection( &m_csHostEnum );
        MessageBox( hDlg, TEXT("There are no games to join."),
                    TEXT("DirectPlay Sample"), MB_OK );
        return S_OK;
    }

    m_bConnecting = TRUE;

    // Set the peer info
    WCHAR wszPeerName[MAX_PATH];
    DXUtil_ConvertGenericStringToWide( wszPeerName, m_strLocalPlayerName );

    DPN_PLAYER_INFO dpPlayerInfo;
    ZeroMemory( &dpPlayerInfo, sizeof(DPN_PLAYER_INFO) );
    dpPlayerInfo.dwSize = sizeof(DPN_PLAYER_INFO);
    dpPlayerInfo.dwInfoFlags = DPNINFO_NAME;
    dpPlayerInfo.pwszName = wszPeerName;

    // Set the peer info, and use the DPNOP_SYNC since by default this
    // is an async call.  If it is not DPNOP_SYNC, then the peer info may not
    // be set by the time we call Connect() below.
    if( FAILED( hr = m_pDP->SetPeerInfo( &dpPlayerInfo, NULL, NULL, DPNOP_SYNC ) ) )
        return DXTRACE_ERR( TEXT("SetPeerInfo"), hr );

    ResetEvent( m_hConnectCompleteEvent );

    // Connect to an existing session. DPNCONNECT_OKTOQUERYFORADDRESSING allows
    // DirectPlay to prompt the user using a dialog box for any device address
    // or host address information that is missing
    // We also pass in copies of the app desc and host addr, since pDPHostEnumSelected
    // might be deleted from another thread that calls SessionsDlgExpireOldHostEnums().
    // This process could also be done using reference counting instead.
    hr = m_pDP->Connect( pDPHostEnumSelected->pAppDesc,       // the application desc
                         pDPHostEnumSelected->pHostAddr,      // address of the host of the session
                         pDPHostEnumSelected->pDeviceAddr,    // address of the local device the enum responses were received on
                         NULL, NULL,                          // DPN_SECURITY_DESC, DPN_SECURITY_CREDENTIALS
                         NULL, 0,                             // user data, user data size
                         NULL,                                // player context,
                         NULL, &m_hConnectAsyncOp,            // async context, async handle,
                         DPNCONNECT_OKTOQUERYFORADDRESSING ); // flags
    if( hr != E_PENDING && FAILED(hr) )
        return DXTRACE_ERR( TEXT("Connect"), hr );

    LeaveCriticalSection( &m_csHostEnum );

    // Set a timer to wait for m_hConnectCompleteEvent to be signaled.
    // This will tell us when DPN_MSGID_CONNECT_COMPLETE has been processed
    // which lets us know if the connect was successful or not.
    SetTimer( hDlg, TIMERID_CONNECT_COMPLETE, 100, NULL );

    // Disable the create/join buttons until connect succeeds or fails
    EnableWindow( GetDlgItem( hDlg, IDC_JOIN ), FALSE );
    EnableWindow( GetDlgItem( hDlg, IDC_CREATE ), FALSE );

    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: SessionsDlgCreateGame()
// Desc: Asks the user the session name, and creates a new DirectPlay session
//-----------------------------------------------------------------------------
HRESULT CNetConnectWizard::SessionsDlgCreateGame( HWND hDlg )
{
    HRESULT hr;
    int     nResult;

    // Display a modal multiplayer connect dialog box.
    EnableWindow( hDlg, FALSE );
    nResult = (int)DialogBox( m_hInst, MAKEINTRESOURCE(IDD_MULTIPLAYER_CREATE),
                              hDlg, (DLGPROC) StaticCreateSessionDlgProc );
    EnableWindow( hDlg, TRUE );

    if( nResult == IDCANCEL )
        return S_OK;

    // Stop the search if we are about to connect
    if( m_bSearchingForSessions )
    {
        CheckDlgButton( m_hDlg, IDC_SEARCH_CHECK, BST_UNCHECKED );
        SendMessage( m_hDlg, WM_COMMAND, IDC_SEARCH_CHECK, 0 );
    }

    m_bHostPlayer = TRUE;

    // Set peer info name
    WCHAR wszPeerName[MAX_PATH];
    DXUtil_ConvertGenericStringToWide( wszPeerName, m_strLocalPlayerName );

    DPN_PLAYER_INFO dpPlayerInfo;
    ZeroMemory( &dpPlayerInfo, sizeof(DPN_PLAYER_INFO) );
    dpPlayerInfo.dwSize = sizeof(DPN_PLAYER_INFO);
    dpPlayerInfo.dwInfoFlags = DPNINFO_NAME;
    dpPlayerInfo.pwszName = wszPeerName;

    // Set the peer info, and use the DPNOP_SYNC since by default this
    // is an async call.  If it is not DPNOP_SYNC, then the peer info may not
    // be set by the time we call Host() below.
    if( FAILED( hr = m_pDP->SetPeerInfo( &dpPlayerInfo, NULL, NULL, DPNOP_SYNC ) ) )
        return DXTRACE_ERR( TEXT("SetPeerInfo"), hr );

    WCHAR wszSessionName[MAX_PATH];
    DXUtil_ConvertGenericStringToWide( wszSessionName, m_strSessionName );

    // Setup the application desc
    DPN_APPLICATION_DESC dnAppDesc;
    ZeroMemory( &dnAppDesc, sizeof(DPN_APPLICATION_DESC) );
    dnAppDesc.dwSize          = sizeof(DPN_APPLICATION_DESC);
    dnAppDesc.guidApplication = m_guidApp;
    dnAppDesc.pwszSessionName = wszSessionName;
    dnAppDesc.dwMaxPlayers    = m_dwMaxPlayers;
    dnAppDesc.dwFlags         = 0;
    if( m_bMigrateHost )
        dnAppDesc.dwFlags |= DPNSESSION_MIGRATE_HOST;

    // Host a game on m_pDeviceAddress as described by dnAppDesc
    // DPNHOST_OKTOQUERYFORADDRESSING allows DirectPlay to prompt the user
    // using a dialog box for any device address information that is missing
    if( FAILED( hr = m_pDP->Host( &dnAppDesc,               // the application desc
                                  &m_pDeviceAddress,        // array of addresses of the local devices used to connect to the host
                                  1,                        // number in array
                                  NULL, NULL,               // DPN_SECURITY_DESC, DPN_SECURITY_CREDENTIALS
                                  NULL,                     // player context
                                  DPNHOST_OKTOQUERYFORADDRESSING ) ) ) // flags
        return DXTRACE_ERR( TEXT("Host"), hr );

    // DirectPlay connect successful, so end dialog
    m_hrDialog = NCW_S_FORWARD;
    EndDialog( hDlg, 0 );

    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: StaticConnectionsDlgProc()
// Desc: Static msg handler which passes messages
//-----------------------------------------------------------------------------
INT_PTR CALLBACK CNetConnectWizard::StaticCreateSessionDlgProc( HWND hDlg, UINT uMsg,
                                                                WPARAM wParam, LPARAM lParam )
{
    if( g_pNCW )
        return g_pNCW->CreateSessionDlgProc( hDlg, uMsg, wParam, lParam );

    return FALSE; // Message not handled
}




//-----------------------------------------------------------------------------
// Name: CreateSessionDlgProc()
// Desc: Handles messages fro the multiplayer create game dialog
//-----------------------------------------------------------------------------
INT_PTR CALLBACK CNetConnectWizard::CreateSessionDlgProc( HWND hDlg, UINT msg,
                                                          WPARAM wParam, LPARAM lParam )
{
    DWORD dwNameLength;

    switch( msg )
    {
        case WM_INITDIALOG:
            SetDlgItemText( hDlg, IDC_EDIT_SESSION_NAME, m_strSessionName );
            CheckDlgButton( hDlg, IDC_MIGRATE_HOST, BST_CHECKED );
            return TRUE;

        case WM_COMMAND:
            switch( LOWORD(wParam) )
            {
                case IDOK:
                    dwNameLength = GetDlgItemText( hDlg, IDC_EDIT_SESSION_NAME,
                                                   m_strSessionName,
                                                   MAX_PATH );
                    if( dwNameLength == 0 )
                        return TRUE; // Don't accept blank session names

                    m_bMigrateHost = ( IsDlgButtonChecked( hDlg,
                                       IDC_MIGRATE_HOST ) == BST_CHECKED );

                    EndDialog( hDlg, IDOK );
                    return TRUE;

                case IDCANCEL:
                    EndDialog( hDlg, IDCANCEL );
                    return TRUE;
            }
            break;
    }

    return FALSE; // Didn't handle message
}




//-----------------------------------------------------------------------------
// Name: SessionsDlgEnumListCleanup()
// Desc: Deletes the linked list, g_DPHostEnumInfoHead
//-----------------------------------------------------------------------------
VOID CNetConnectWizard::SessionsDlgEnumListCleanup()
{
    DPHostEnumInfo* pDPHostEnum = m_DPHostEnumHead.pNext;
    DPHostEnumInfo* pDPHostEnumDelete;

    while ( pDPHostEnum != &m_DPHostEnumHead )
    {
        pDPHostEnumDelete = pDPHostEnum;
        pDPHostEnum = pDPHostEnum->pNext;

        if( pDPHostEnumDelete->pAppDesc )
        {
            SAFE_DELETE_ARRAY( pDPHostEnumDelete->pAppDesc->pwszSessionName );
            SAFE_DELETE_ARRAY( pDPHostEnumDelete->pAppDesc );
        }