将数据附加到MapViewOfFile中的内存映射文件

问题描述

大家好，

我正在使用MapViewOfFile映射文件并尝试编辑其数据并将其保存在文件中。

我有额外的问题数据到扩展其大小所需的文件。

那么，如何使用CreateFileMapping和MapViewOfFile将数据附加到内存映射文件的末尾？

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?

推荐答案

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);

这篇关于将数据附加到MapViewOfFile中的内存映射文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！