append data to memory mapped file in MapViewOfFile

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Hello guys,
I'm using MapViewOfFile to map a file and try to edit its data and save it on the file.
The problem I have extra data to the file required to expand its size.
So, how to append data to the end of memory mapped file using CreateFileMapping and MapViewOfFile?

Posted 24-May-13 6:30am

Rasool Ahmed

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Santhosh G_ 24-May-13 16:27pm

Do you want to change the file contents, by appending some data at the end of mapped file, right ?

Rasool Ahmed 24-May-13 23:18pm

Yes, I want to edit the middle of the content and append additional data to the end of the file, this will expand its size.

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Santhosh G_ · Accepted Answer · 2013-05-24T18:33:00

Try to use the below method it create file mapping with large size and update the contents.

C++

DWORD nSize = GetFileSize( hFile, &nSizeH );
    int nRequiredSize = nSize + nAddedSize;// New size is calculated for file mapping.
    HANDLE hMapping = CreateFileMapping( hFile, 0, PAGE_READWRITE, 0,nRequiredSize,0 );
    CHAR* pData = (CHAR*)MapViewOfFile( hMapping, FILE_MAP_ALL_ACCESS, 0,0, 0 );
    // Append data to pData
    UnmapViewOfFile(pData);
    CloseHandle(hMapping);

append data to memory mapped file in MapViewOfFile

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append data to memory mapped file in MapViewOfFile

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