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panda/src/windisplay/winGraphicsPipe.cxx

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// Filename: winGraphicsPipe.cxx
// Created by:  drose (20Dec02)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) 2001, Disney Enterprises, Inc.  All rights reserved
//
// All use of this software is subject to the terms of the Panda 3d
// Software license.  You should have received a copy of this license
// along with this source code; you will also find a current copy of
// the license at http://www.panda3d.org/license.txt .
//
// To contact the maintainers of this program write to
// panda3d@yahoogroups.com .
//
////////////////////////////////////////////////////////////////////

#include "winGraphicsPipe.h"
#include "config_windisplay.h"

TypeHandle WinGraphicsPipe::_type_handle;

////////////////////////////////////////////////////////////////////
//     Function: WinGraphicsPipe::Constructor
//       Access: Public
//  Description: 
////////////////////////////////////////////////////////////////////
WinGraphicsPipe::
WinGraphicsPipe() {
  // these fns arent defined on win95, so get dynamic ptrs to them
  // to avoid ugly DLL loader failures on w95
  _pfnTrackMouseEvent = NULL;

  _hUser32 = (HINSTANCE)LoadLibrary("user32.dll");
  if (_hUser32 != NULL) {
    _pfnTrackMouseEvent = 
      (PFN_TRACKMOUSEEVENT)GetProcAddress(_hUser32, "TrackMouseEvent");
  }
}

////////////////////////////////////////////////////////////////////
//     Function: WinGraphicsPipe::Destructor
//       Access: Public, Virtual
//  Description: 
////////////////////////////////////////////////////////////////////
WinGraphicsPipe::
~WinGraphicsPipe() {
  if (_hUser32 != NULL) {
    FreeLibrary(_hUser32);
    _hUser32 = NULL;
  }
}

bool MyGetProcAddr(HINSTANCE hDLL, FARPROC *pFn, const char *szExportedFnName) {
  *pFn = (FARPROC) GetProcAddress(hDLL, szExportedFnName);
  if (*pFn == NULL) {
    windisplay_cat.error() << "GetProcAddr failed for " << szExportedFnName << ", error=" << GetLastError() <<endl;
    return false;
  }
  return true;
}

bool MyLoadLib(HINSTANCE &hDLL, const char *DLLname) {
  hDLL = LoadLibrary(DLLname);
  if(hDLL == NULL) {
    windisplay_cat.error() << "LoadLibrary failed for " << DLLname << ", error=" << GetLastError() <<endl;
    return false;
  }
  return true;
}

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