INFOTIP.CPP

/************************************************************************** 
   THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF 
   ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO 
   THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A 
   PARTICULAR PURPOSE. 
 
   Copyright 1997 Microsoft Corporation.  All Rights Reserved. 
**************************************************************************/ 
 
/************************************************************************** 
 
   File:          InfoTip.cpp 
    
   Description:   Implements CQueryInfo. 
 
**************************************************************************/ 
 
#include "InfoTip.h" 
 
#if (_WIN32_IE >= 0x0400) 
 
/************************************************************************** 
   #include statements 
**************************************************************************/ 
 
#include "Guid.h" 
#include "Utility.h" 
 
/************************************************************************** 
 
   CQueryInfo::CQueryInfo() 
 
**************************************************************************/ 
 
CQueryInfo::CQueryInfo(LPCITEMIDLIST pidl) 
{ 
m_pPidlMgr = new CPidlMgr(); 
if(!m_pPidlMgr) 
   { 
   delete this; 
   return; 
   } 
 
//get the shell's IMalloc pointer 
//we'll keep this until we get destroyed 
if(FAILED(SHGetMalloc(&m_pMalloc))) 
   { 
   delete this; 
   return; 
   } 
 
m_pidl = m_pPidlMgr->Copy(pidl); 
 
m_ObjRefCount = 1; 
 
g_DllRefCount++; 
} 
 
/************************************************************************** 
 
   CQueryInfo::~CQueryInfo() 
 
**************************************************************************/ 
 
CQueryInfo::~CQueryInfo() 
{ 
if(m_pidl) 
   { 
   m_pPidlMgr->Delete(m_pidl); 
   m_pidl = NULL; 
   } 
 
if(m_pMalloc) 
   { 
   m_pMalloc->Release(); 
   } 
 
if(m_pPidlMgr) 
   { 
   delete m_pPidlMgr; 
   } 
 
g_DllRefCount--; 
} 
 
/////////////////////////////////////////////////////////////////////////// 
// 
// IUnknown Implementation 
// 
 
/************************************************************************** 
 
   CQueryInfo::QueryInterface 
 
**************************************************************************/ 
 
STDMETHODIMP CQueryInfo::QueryInterface(REFIID riid, LPVOID *ppReturn) 
{ 
*ppReturn = NULL; 
 
//IUnknown 
if(IsEqualIID(riid, IID_IUnknown)) 
   { 
   *ppReturn = this; 
   } 
 
//IQueryInfo 
else if(IsEqualIID(riid, IID_IQueryInfo)) 
   { 
   *ppReturn = (IQueryInfo*)this; 
   } 
 
if(*ppReturn) 
   { 
   (*(LPUNKNOWN*)ppReturn)->AddRef(); 
   return S_OK; 
   } 
 
return E_NOINTERFACE; 
}                                              
 
/************************************************************************** 
 
   CQueryInfo::AddRef 
 
**************************************************************************/ 
 
STDMETHODIMP_(DWORD) CQueryInfo::AddRef() 
{ 
return ++m_ObjRefCount; 
} 
 
/************************************************************************** 
 
   CQueryInfo::Release 
 
**************************************************************************/ 
 
STDMETHODIMP_(DWORD) CQueryInfo::Release() 
{ 
if(--m_ObjRefCount == 0) 
   { 
   delete this; 
   return 0; 
   } 
    
return m_ObjRefCount; 
} 
 
/////////////////////////////////////////////////////////////////////////// 
// 
// IQueryInfo Implementation 
// 
 
/************************************************************************** 
 
   CQueryInfo::GetInfoTip() 
    
**************************************************************************/ 
 
STDMETHODIMP CQueryInfo::GetInfoTip(DWORD dwFlags, WCHAR **ppwszTip) 
{ 
TCHAR szTipText[MAX_PATH]; 
int   cchOleStr; 
 
*ppwszTip = NULL; 
 
//get the entire text for the item 
m_pPidlMgr->GetPidlPath(m_pidl, szTipText, sizeof(szTipText)); 
 
//get the number of characters required 
cchOleStr = lstrlen(szTipText) + 1; 
 
//allocate the wide character string 
*ppwszTip = (LPWSTR)m_pMalloc->Alloc(cchOleStr * sizeof(WCHAR)); 
if(!*ppwszTip) 
   return E_OUTOFMEMORY; 
 
LocalToWideChar(*ppwszTip, szTipText, cchOleStr); 
 
return S_OK; 
} 
 
/************************************************************************** 
 
   CQueryInfo::GetInfoFlags() 
    
**************************************************************************/ 
 
STDMETHODIMP CQueryInfo::GetInfoFlags(LPDWORD pdwFlags) 
{ 
return E_NOTIMPL; 
} 
 
#endif   //(_WIN32_IE >= 0x0400)