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POC++ MapViewOfFile fails
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  1. POC++ MapViewOfFile fails
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    copied!<p>I am trying to memory-map a file on Windows using VS2010. I am doing this in a DLL. The first instance of the DLL maps the file just fine. The second instance within the same process causes </p> <pre><code>*ppvData = ::MapViewOfFile( *phMapping, FILE_MAP_READ, 0, 0, 0 ); </code></pre> <p>to fail with the error "Not enough memory available for this command". I am not sure why this happens. </p> <p>If I map 2 different files instead of twice the same file, all works fine, so I don't trust the "Not enough memory" error message. </p> <p>Thank you.</p> <pre><code>hr = MapFile(sPath, &amp;m_hVoiceData, &amp;m_pVoiceData,wsErr ); HRESULT CTTSEngObj::MapFile( wstring uPath, // Value that contains file path HANDLE * phMapping, // Pointer to file mapping handle void ** ppvData, // Pointer to the data wstring &amp;uError) { HRESULT hr = S_OK; CSpDynamicString dstrFilePath(uPath.c_str()); if ( SUCCEEDED( hr ) ) { bool fWorked = false; *phMapping = NULL; *ppvData = NULL; HANDLE hFile; #ifdef _WIN32_WCE hFile = CreateFileForMapping( dstrFilePath, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL ); #else hFile = CreateFile(CW2T(dstrFilePath), GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL ); #endif if (hFile != INVALID_HANDLE_VALUE) { *phMapping = ::CreateFileMapping( hFile, NULL, PAGE_READONLY, 0, 0, NULL ); if (*phMapping) { *ppvData = ::MapViewOfFile( *phMapping, FILE_MAP_READ, 0, 0, 0 ); if (*ppvData) { fWorked = true; } else { uError=GetLastErrorStdStrW(); } } else { uError=L"mapfile: fm failed"; } ::CloseHandle( hFile ); } else { uError=L"mapfile: invalidhandle"; } if (!fWorked) { hr = HRESULT_FROM_WIN32(::GetLastError()); if (*phMapping) { ::CloseHandle(*phMapping); *phMapping = NULL; } } } else { uError=L"mapfile: dynstr"; } return hr; } /* CTTSEngObj::MapFile */ </code></pre> <p>And this is how it is declared:</p> <pre><code>class ATL_NO_VTABLE CTTSEngObj : public CComObjectRootEx&lt;CComMultiThreadModel&gt;, public CComCoClass&lt;CTTSEngObj, &amp;CLSID_SampleTTSEngine&gt;, public ISpTTSEngine, public ISpObjectWithToken { private: CComPtr&lt;ISpObjectToken&gt; m_cpToken; HANDLE m_hVoiceData; void* m_pVoiceData; </code></pre>
 

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