347 lines
8.5 KiB
C++
347 lines
8.5 KiB
C++
/*==========================================================================
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*
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* Copyright (C) 2000 Microsoft Corporation. All Rights Reserved.
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*
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* File: comutil.cpp
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* Content: Contains implementation of COM helper functions for DPLAY8 project.
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*@@BEGIN_MSINTERNAL
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* History:
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* Date By Reason
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* ==== == ======
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* 06/07/00 rmt Created
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* 06/15/2000 rmt Fixed small bug in COM_CoCreateInstance which was causing AV
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* 06/27/00 rmt Added abstraction for COM_Co(Un)Initialize
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* 07/06/00 rmt Modified to match updated creg usage
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* 08/08/2000 rmt Bug #41736 - AV in call to lstrcpy by COM_GetDllName
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* 01/11/2001 rmt MANBUG #48487 - DPLAY: Crashes if CoCreate() isn't called.
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* 03/14/2001 rmt WINBUG #342420 - Restore COM emulation layer to operation.
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*@@END_MSINTERNAL
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*
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***************************************************************************/
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#include "dncmni.h"
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#include "comutil.h"
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#undef DPF_SUBCOMP
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#define DPF_SUBCOMP DN_SUBCOMP_COMMON
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typedef HRESULT (WINAPI *PFNDLLGETCLASSOBJECT)(REFCLSID rclsid,REFIID riid,LPVOID *ppvObj );
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typedef HRESULT (WINAPI *PFNDLLCANUNLOADNOW)(void);
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CBilink g_blComEntriesGlobal;
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DNCRITICAL_SECTION csComEntriesLock;
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typedef struct _COMDLL_ENTRY
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{
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HMODULE hDLL;
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CHAR szFileName[_MAX_PATH];
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GUID clsid;
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PFNDLLGETCLASSOBJECT pfnGetClassObject;
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PFNDLLCANUNLOADNOW pfnCanUnloadNow;
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CBilink blComEntries;
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} COMDLL_ENTRY, *PCOMDLL_ENTRY;
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#undef DPF_MODNAME
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#define DPF_MODNAME "COM_Init"
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HRESULT COM_Init()
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{
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g_blComEntriesGlobal.Initialize();
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if (DNInitializeCriticalSection( &csComEntriesLock ) == FALSE)
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{
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return DPNERR_OUTOFMEMORY;
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}
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return DPN_OK;
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}
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#undef DPF_MODNAME
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#define DPF_MODNAME "COM_Free"
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HRESULT COM_Free()
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{
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CBilink *pblSearch;
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PCOMDLL_ENTRY pEntry;
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pblSearch = g_blComEntriesGlobal.GetNext();
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while( pblSearch != &g_blComEntriesGlobal )
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{
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pEntry = CONTAINING_RECORD( pblSearch, COMDLL_ENTRY, blComEntries );
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pblSearch = pblSearch->GetNext();
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FreeLibrary( pEntry->hDLL );
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delete pEntry;
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}
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DNDeleteCriticalSection( &csComEntriesLock );
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return DPN_OK;
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}
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#undef DPF_MODNAME
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#define DPF_MODNAME "COM_CoInitialize"
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HRESULT COM_CoInitialize( void * pvParam )
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{
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return CoInitializeEx( pvParam, COINIT_MULTITHREADED );
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}
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#undef DPF_MODNAME
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#define DPF_MODNAME "COM_CoUninitialize"
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void COM_CoUninitialize()
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{
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CoUninitialize();
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}
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#undef DPF_MODNAME
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#define DPF_MODNAME "COM_GetEntry"
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HRESULT COM_GetEntry( GUID clsid, PCOMDLL_ENTRY *ppEntry )
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{
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CBilink *pblSearch;
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PCOMDLL_ENTRY pEntry;
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HRESULT hr;
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DWORD dwSize;
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DNEnterCriticalSection( &csComEntriesLock );
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pblSearch = g_blComEntriesGlobal.GetNext();
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while( pblSearch != &g_blComEntriesGlobal )
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{
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pEntry = CONTAINING_RECORD( pblSearch, COMDLL_ENTRY, blComEntries );
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// This should never happen, but makes prefix happy
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if( !pEntry )
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{
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DNASSERT( FALSE );
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DNLeaveCriticalSection( &csComEntriesLock );
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return DPNERR_GENERIC;
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}
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if( pEntry->clsid == clsid )
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{
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*ppEntry = pEntry;
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DNLeaveCriticalSection( &csComEntriesLock );
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return DPN_OK;
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}
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pblSearch = pblSearch->GetNext();
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}
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pEntry = new COMDLL_ENTRY;
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if (pEntry == NULL)
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{
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DPFERR( "Error allocating COM entry" );
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hr = DPNERR_OUTOFMEMORY;
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goto LOAD_FAILED;
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}
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memset( pEntry, 0x00, sizeof( COMDLL_ENTRY ) );
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pEntry->clsid = clsid;
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pEntry->blComEntries.Initialize();
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dwSize = _MAX_PATH;
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hr = COM_GetDLLName( clsid, pEntry->szFileName, &dwSize );
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if( FAILED( hr ) )
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{
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DPFERR( "Unable to find DLL name for COM object" );
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goto LOAD_FAILED;
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}
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pEntry->hDLL = LoadLibraryA( pEntry->szFileName );
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if( !pEntry->hDLL )
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{
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hr = GetLastError();
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DPFX(DPFPREP, 0, "Unable to load libary err=0x%x", hr );
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goto LOAD_FAILED;
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}
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pEntry->pfnGetClassObject = (PFNDLLGETCLASSOBJECT) GetProcAddress( pEntry->hDLL, "DllGetClassObject" );
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pEntry->pfnCanUnloadNow = (PFNDLLCANUNLOADNOW) GetProcAddress( pEntry->hDLL, "DllCanUnloadNow" );
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pEntry->blComEntries.InsertBefore( &g_blComEntriesGlobal );
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DNLeaveCriticalSection( &csComEntriesLock );
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*ppEntry = pEntry;
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return DPN_OK;
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LOAD_FAILED:
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if( pEntry != NULL )
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{
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if( pEntry->hDLL != NULL )
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{
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FreeLibrary( pEntry->hDLL );
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}
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delete pEntry;
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}
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DNLeaveCriticalSection( &csComEntriesLock );
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return hr;
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}
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#undef DPF_MODNAME
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#define DPF_MODNAME "COM_GetDLLName"
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HRESULT COM_GetDLLName( GUID guidCLSID, CHAR *szPath, DWORD *pdwSize )
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{
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CRegistry cregRoot;
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CRegistry cregCLSID;
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CRegistry cregInProc;
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HRESULT hr = DPN_OK;
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BOOL fSuccess;
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WCHAR *wszTmpPath = NULL;
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DWORD dwTmpSize = 0;
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fSuccess = cregRoot.Open( HKEY_CLASSES_ROOT, L"CLSID", TRUE, FALSE );
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if( !fSuccess )
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{
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DPFX(DPFPREP, 0, "Error opening HKEY_CLASSES_ROOT\\CLSID" );
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hr = E_FAIL;
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goto COM_GETDLLNAME_ERROR;
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}
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fSuccess = cregCLSID.Open( cregRoot, &guidCLSID, TRUE, FALSE );
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if( !fSuccess )
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{
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DPFX(DPFPREP, 0, "Error opening specified CLSID" );
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hr = E_FAIL;
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goto COM_GETDLLNAME_ERROR;
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}
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fSuccess = cregInProc.Open( cregCLSID, L"InprocServer32", TRUE, FALSE );
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if( !fSuccess )
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{
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DPFX(DPFPREP, 0, "Error opening inprocserver key" );
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hr = E_FAIL;
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goto COM_GETDLLNAME_ERROR;
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}
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cregCLSID.Close();
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cregRoot.Close();
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fSuccess = cregInProc.ReadString( L"", wszTmpPath, &dwTmpSize );
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if( !dwTmpSize )
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{
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DPFX(DPFPREP, 0, "Error opening default key" );
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hr = E_FAIL;
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goto COM_GETDLLNAME_ERROR;
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}
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if( dwTmpSize > *pdwSize )
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{
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DPFX(DPFPREP, 0, "Buffer too small" );
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hr = DPNERR_BUFFERTOOSMALL;
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*pdwSize = dwTmpSize;
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goto COM_GETDLLNAME_ERROR;
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}
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*pdwSize = dwTmpSize;
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wszTmpPath = new WCHAR[dwTmpSize];
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if( !wszTmpPath )
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{
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DPFX(DPFPREP, 0, "Error allocating memory" );
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hr = DPNERR_OUTOFMEMORY;
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goto COM_GETDLLNAME_ERROR;
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}
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fSuccess = cregInProc.ReadString( L"", wszTmpPath, &dwTmpSize );
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if( !fSuccess )
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{
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DPFX(DPFPREP, 0, "Error opening default key" );
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hr = E_FAIL;
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goto COM_GETDLLNAME_ERROR;
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}
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if( FAILED( hr = STR_jkWideToAnsi(szPath,wszTmpPath, *pdwSize ) ) )
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{
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DPFX(DPFPREP, 0, "Error converting path to DLL to ANSI hr=0x%x", hr );
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hr = E_FAIL;
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}
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delete [] wszTmpPath;
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return hr;
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COM_GETDLLNAME_ERROR:
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if( wszTmpPath )
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delete [] wszTmpPath;
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return hr;
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}
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// DP_CoCreateInstance
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//
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// This CoCreateInstance can be used instead of CoCreateInstance and will manually perform the
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// steps neccessary to do a CoCreateInstance if COM has not been initialized.
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//
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#undef DPF_MODNAME
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#define DPF_MODNAME "COM_CoCreateInstance"
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STDAPI COM_CoCreateInstance( REFCLSID rclsid, LPUNKNOWN pUnkOuter, DWORD dwClsContext, REFIID riid, LPVOID *ppv, BOOL fWarnUser )
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{
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HRESULT hr;
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CHAR *szFileName = NULL;
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DWORD dwFileNameSize = 0;
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PCOMDLL_ENTRY pEntry;
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IClassFactory *pClassFactory;
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hr = CoCreateInstance( rclsid, pUnkOuter, dwClsContext, riid, ppv );
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if( hr == CO_E_NOTINITIALIZED )
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{
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if( fWarnUser )
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{
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DPFX(DPFPREP, 0, "=====================================================================================" );
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DPFX(DPFPREP, 0, "" );
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DPFX(DPFPREP, 0, "The DirectPlay8/Voice create functions are no longer supported. It is recommended" );
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DPFX(DPFPREP, 0, "that your application be updated to use CoCreateInstance instead." );
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DPFX(DPFPREP, 0, "" );
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DPFX(DPFPREP, 0, "=====================================================================================" );
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}
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hr = COM_GetEntry( rclsid, &pEntry );
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if( FAILED( hr ) )
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return hr;
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hr = (*pEntry->pfnGetClassObject)( rclsid, IID_IClassFactory, (void **) &pClassFactory );
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if( FAILED( hr ) )
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{
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DPFX(DPFPREP, 0, "Failed getting class object on dynamic entry hr=0x%x", hr );
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return hr;
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}
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hr = pClassFactory->lpVtbl->CreateInstance( pClassFactory, pUnkOuter, riid, ppv );
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if( FAILED( hr ) )
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{
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DPFX(DPFPREP, 0, "Class factory returned an error hr=0x%x", hr );
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}
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pClassFactory->lpVtbl->Release(pClassFactory);
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return hr;
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}
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return hr;
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}
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