GLOBALS.CPP

///////////////////////////////////////////////////////////////////////////// 
// globals.cpp : IComponent Interface helpers 
// 
// This is a part of the MMC SDK. 
// Copyright (C) 1997 Microsoft Corporation 
// All rights reserved. 
// 
// This source code is only intended as a supplement to the 
// MMC SDK Reference and related 
// electronic documentation provided with the library. 
// See these sources for detailed information regarding the 
// MMC Library product. 
// 
 
#include "stdafx.h" 
#include "globals.h" 
 
HINSTANCE g_hinst;           // Global instance handle 
 
///////////////////////////////////////////////////////////////////////////// 
// Global helper functions to help work with dataobjects and 
// clipboard formats 
 
 
//--------------------------------------------------------------------------- 
//  Returns the current object based on the s_cfInternal clipboard format 
//  
CDataObject* 
ExtractOwnDataObject 
( 
  LPDATAOBJECT lpDataObject      // [in] IComponent pointer  
) 
{ 
  HGLOBAL     hGlobal; 
  HRESULT     hr   = S_OK; 
  CDataObject *pdo = NULL; 
 
  hr = ExtractFromDataObject( lpDataObject, 
                              CDataObject::s_cfInternal,  
                              sizeof(CDataObject **), 
                              &hGlobal 
                            ); 
 
  if (SUCCEEDED(hr)) 
  { 
    pdo = *(CDataObject **)(hGlobal); 
    _ASSERT(pdo);     
    _ASSERT(!GlobalFree(hGlobal)); 
  } 
 
  return pdo; 
 
} // end ExtractOwnDataObject() 
 
//--------------------------------------------------------------------------- 
//  Extracts data based on the passed-in clipboard format 
// 
HRESULT 
ExtractFromDataObject 
( 
  LPDATAOBJECT lpDataObject,   // [in]  Points to data object 
  UINT         cfClipFormat,   // [in]  Clipboard format to use 
  ULONG        nByteCount,     // [in]  Number of bytes to allocate 
  HGLOBAL      *phGlobal       // [out] Points to the data we want  
) 
{ 
  HRESULT hr = S_OK; 
  STGMEDIUM stgmedium = { TYMED_HGLOBAL,  NULL  }; 
  FORMATETC formatetc = { cfClipFormat, NULL, DVASPECT_CONTENT, -1, TYMED_HGLOBAL }; 
 
  _ASSERT( NULL != lpDataObject ); 
 
  *phGlobal = NULL; 
 
  do  
{ 
    // Allocate memory for the stream 
    stgmedium.hGlobal = GlobalAlloc( GMEM_SHARE, nByteCount ); 
 
if (!stgmedium.hGlobal) 
    { 
      hr = E_OUTOFMEMORY; 
      ATLTRACE( L"Out of memory\n" ); 
      break; 
    } 
 
    // Attempt to get data from the object 
    hr = lpDataObject->GetDataHere( &formatetc, &stgmedium ); 
    if (FAILED(hr)) 
    { 
      break;        
    } 
 
    // stgmedium now has the data we need  
    *phGlobal = stgmedium.hGlobal; 
    stgmedium.hGlobal = NULL; 
 
  } while (0);  
 
  if (FAILED(hr) && stgmedium.hGlobal) 
  { 
    _ASSERT( !GlobalFree(stgmedium.hGlobal) ); 
  } 
  return hr; 
 
} // end ExtractFromDataObject() 
 
 
VOID DisplayError( LONG nErrorCode, LPWSTR wszDlgTitle ) 
{ 
  LPVOID lpMsgBuf; 
  ::FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM, 
               NULL, 
                   nErrorCode, 
                   MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),  
                   (LPWSTR)&lpMsgBuf, 
           0, 
           NULL 
         ); 
  ::MessageBox( NULL, (LPWSTR)lpMsgBuf, wszDlgTitle, MB_OK|MB_ICONINFORMATION ); 
  LocalFree( lpMsgBuf ); 
 
}