怎么修改文件呢？
我用vc写了以下代码，想修改文件内容，可是一运行就报错，说什么内存不能读，怎么解决？

C/C++ code

#include "stdafx.h"#include <Windows.h>char* filepath="d:\\Test.exe";int main(int argc, char* argv[]){    HANDLE hFile = CreateFileA(filepath, GENERIC_WRITE, 0,     NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);    DWORD dwFileSize = GetFileSize(hFile, NULL);    HANDLE hfile=::CreateFileMappingA( hFile,NULL,PAGE_READWRITE,0,0,NULL);    LPVOID pData=MapViewOfFile(hfile,FILE_MAP_WRITE,0,0,0);    char* data=(char*)pData;    for(int i=0;i<(int)dwFileSize;++i)    {        char* temp=data+i;        *temp=92;    }    UnmapViewOfFile(pData);    CloseHandle(hfile);    return 0;}