C++ wxDynamicLibrary::Load方法代码示例

bool wxSocketMSWManager::OnInit()
{
  LPCTSTR pclassname = NULL;
  int i;

  /* Create internal window for event notifications */
  hWin = wxCreateHiddenWindow(&pclassname, CLASSNAME, wxSocket_Internal_WinProc);
  if (!hWin)
      return false;

  /* Initialize socket list */
  for (i = 0; i < MAXSOCKETS; i++)
  {
    socketList[i] = NULL;
  }
  firstAvailable = 0;

  // we don't link with wsock32.dll statically to avoid
  // dependencies on it for all the application using wx even if they don't use
  // sockets
    #define WINSOCK_DLL_NAME wxT("wsock32.dll")

    gs_wsock32dll.Load(WINSOCK_DLL_NAME, wxDL_VERBATIM | wxDL_QUIET);
    if ( !gs_wsock32dll.IsLoaded() )
        return false;

    wxDL_INIT_FUNC(gs_, WSAAsyncSelect, gs_wsock32dll);
    if ( !gs_WSAAsyncSelect )
        return false;

  // finally initialize WinSock
  WSADATA wsaData;
  return WSAStartup((1 << 8) | 1, &wsaData) == 0;
}

// Helper wrapping AssocQueryString() Win32 function: returns the value of the
// given associated string for the specified extension (which may or not have
// the leading period).
//
// Returns empty string if the association is not found.
static
wxString wxAssocQueryString(ASSOCSTR assoc,
                            wxString ext,
                            const wxString& verb = wxString())
{
    typedef HRESULT (WINAPI *AssocQueryString_t)(ASSOCF, ASSOCSTR,
                                                  LPCTSTR, LPCTSTR, LPTSTR,
                                                  DWORD *);
    static AssocQueryString_t s_pfnAssocQueryString = (AssocQueryString_t)-1;
    static wxDynamicLibrary s_dllShlwapi;

    if ( s_pfnAssocQueryString == (AssocQueryString_t)-1 )
    {
        if ( !s_dllShlwapi.Load(wxT("shlwapi.dll"), wxDL_VERBATIM | wxDL_QUIET) )
            s_pfnAssocQueryString = NULL;
        else
            wxDL_INIT_FUNC_AW(s_pfn, AssocQueryString, s_dllShlwapi);
    }

    if ( !s_pfnAssocQueryString )
        return wxString();


    DWORD dwSize = MAX_PATH;
    TCHAR bufOut[MAX_PATH] = { 0 };

    if ( ext.empty() || ext[0] != '.' )
        ext.Prepend('.');

    HRESULT hr = s_pfnAssocQueryString
                 (
                    wxASSOCF_NOTRUNCATE,// Fail if buffer is too small.
                    assoc,              // The association to retrieve.
                    ext.t_str(),        // The extension to retrieve it for.
                    verb.empty() ? NULL
                                 : static_cast<const TCHAR*>(verb.t_str()),
                    bufOut,             // The buffer for output value.
                    &dwSize             // And its size
                 );

    // Do not use SUCCEEDED() here as S_FALSE could, in principle, be returned
    // but would still be an error in this context.
    if ( hr != S_OK )
    {
        // The only really expected error here is that no association is
        // defined, anything else is not expected. The confusing thing is that
        // different errors are returned for this expected error under
        // different Windows versions: XP returns ERROR_FILE_NOT_FOUND while 7
        // returns ERROR_NO_ASSOCIATION. Just check for both to be sure.
        if ( hr != HRESULT_FROM_WIN32(ERROR_NO_ASSOCIATION) &&
                hr != HRESULT_FROM_WIN32(ERROR_FILE_NOT_FOUND) )
        {
            wxLogApiError("AssocQueryString", hr);
        }

        return wxString();
    }

    return wxString(bufOut);
}

bool wxTextEntry::AutoCompleteFileNames()
{
#ifdef HAS_AUTOCOMPLETE
    typedef HRESULT (WINAPI *SHAutoComplete_t)(HWND, DWORD);
    static SHAutoComplete_t s_pfnSHAutoComplete = (SHAutoComplete_t)-1;
    static wxDynamicLibrary s_dllShlwapi;
    if ( s_pfnSHAutoComplete == (SHAutoComplete_t)-1 )
    {
        if ( !s_dllShlwapi.Load(wxT("shlwapi.dll"), wxDL_VERBATIM | wxDL_QUIET) )
        {
            s_pfnSHAutoComplete = NULL;
        }
        else
        {
            wxDL_INIT_FUNC(s_pfn, SHAutoComplete, s_dllShlwapi);
        }
    }

    if ( !s_pfnSHAutoComplete )
        return false;

    HRESULT hr = (*s_pfnSHAutoComplete)(GetEditHwnd(), SHACF_FILESYS_ONLY);
    if ( FAILED(hr) )
    {
        wxLogApiError(wxT("SHAutoComplete()"), hr);

        return false;
    }
    return true;
#else // !HAS_AUTOCOMPLETE
    return false;
#endif // HAS_AUTOCOMPLETE/!HAS_AUTOCOMPLETE
}

bool wxSocketMSWManager::OnInit()
{
  static LPCTSTR pclassname = NULL;
  int i;

  /* Create internal window for event notifications */
  hWin = wxCreateHiddenWindow(&pclassname, CLASSNAME, wxSocket_Internal_WinProc);
  if (!hWin)
      return false;

  /* Initialize socket list */
  for (i = 0; i < MAXSOCKETS; i++)
  {
    socketList[i] = NULL;
  }
  firstAvailable = 0;

  // we don't link with wsock32.dll (or ws2 in CE case) statically to avoid
  // dependencies on it for all the application using wx even if they don't use
  // sockets
#ifdef __WXWINCE__
    #define WINSOCK_DLL_NAME wxT("ws2.dll")
#else
    #define WINSOCK_DLL_NAME wxT("wsock32.dll")
#endif

    gs_wsock32dll.Load(WINSOCK_DLL_NAME, wxDL_VERBATIM | wxDL_QUIET);
    if ( !gs_wsock32dll.IsLoaded() )
        return false;

#ifndef __WXWINCE__
    wxDL_INIT_FUNC(gs_, WSAAsyncSelect, gs_wsock32dll);
    if ( !gs_WSAAsyncSelect )
        return false;
#else
    wxDL_INIT_FUNC(gs_, WSAEventSelect, gs_wsock32dll);
    if ( !gs_WSAEventSelect )
        return false;

    wxDL_INIT_FUNC(gs_, WSACreateEvent, gs_wsock32dll);
    if ( !gs_WSACreateEvent )
        return false;

    wxDL_INIT_FUNC(gs_, WSAWaitForMultipleEvents, gs_wsock32dll);
    if ( !gs_WSAWaitForMultipleEvents )
        return false;

    wxDL_INIT_FUNC(gs_, WSAEnumNetworkEvents, gs_wsock32dll);
    if ( !gs_WSAEnumNetworkEvents )
        return false;

    currSocket = 0;
#endif // !__WXWINCE__/__WXWINCE__

  // finally initialize WinSock
  WSADATA wsaData;
  return WSAStartup((1 << 8) | 1, &wsaData) == 0;
}

//=============================================================================
// Function: GetVolumes
// Purpose: Generate and return a list of all volumes (drives) available.
// Notes:
//=============================================================================
wxArrayString wxFSVolumeBase::GetVolumes(int flagsSet, int flagsUnset)
{
    ::InterlockedExchange(&s_cancelSearch, FALSE);     // reset

#if wxUSE_DYNLIB_CLASS
    if (!s_mprLib.IsLoaded() && s_mprLib.Load(wxT("mpr.dll")))
    {
#ifdef UNICODE
        s_pWNetOpenEnum = (WNetOpenEnumPtr)s_mprLib.GetSymbol(wxT("WNetOpenEnumW"));
        s_pWNetEnumResource = (WNetEnumResourcePtr)s_mprLib.GetSymbol(wxT("WNetEnumResourceW"));
#else
        s_pWNetOpenEnum = (WNetOpenEnumPtr)s_mprLib.GetSymbol(wxT("WNetOpenEnumA"));
        s_pWNetEnumResource = (WNetEnumResourcePtr)s_mprLib.GetSymbol(wxT("WNetEnumResourceA"));
#endif
        s_pWNetCloseEnum = (WNetCloseEnumPtr)s_mprLib.GetSymbol(wxT("WNetCloseEnum"));
    }
#endif

    wxArrayString list;

    //-------------------------------
    // Local and mapped drives first.
    //-------------------------------
    // Allocate the required space for the API call.
    const DWORD chars = GetLogicalDriveStrings(0, NULL);
    TCHAR* buf = new TCHAR[chars+1];

    // Get the list of drives.
    GetLogicalDriveStrings(chars, buf);

    // Parse the list into an array, applying appropriate filters.
    TCHAR *pVol;
    pVol = buf;
    while (*pVol)
    {
        FilteredAdd(list, pVol, flagsSet, flagsUnset);
        pVol = pVol + wxStrlen(pVol) + 1;
    }

    // Cleanup.
    delete[] buf;

    //---------------------------
    // Network Neighborhood next.
    //---------------------------

    // not exclude remote and not removable
    if (!(flagsUnset & wxFS_VOL_REMOTE) &&
        !(flagsSet & wxFS_VOL_REMOVABLE)
       )
    {
        // The returned list will be sorted alphabetically.  We don't pass
        // our in since we don't want to change to order of the local drives.
        wxArrayString nn;
        if (BuildRemoteList(nn, 0, flagsSet, flagsUnset))
        {
            for (size_t idx = 0; idx < nn.GetCount(); idx++)
                list.Add(nn[idx]);
        }
    }

    return list;
} // GetVolumes