C语言实现大数据文件的内存映射机制

#include "stdafx.h" #include "windows.h" #include <iostream> #include <fstream>  using namespace std;    int main(int argc, _TCHAR* argv[]){    //// Open the file that we want to map.   HANDLE hFile = ::CreateFile(L"C:/Users/Joe WANG/Desktop/Data.txt",    GENERIC_READ | GENERIC_WRITE,    0,    NULL,    OPEN_ALWAYS,    FILE_ATTRIBUTE_NORMAL,    NULL);    // Create a file-mapping object for the file.   HANDLE hFileMapping = ::CreateFileMapping(hFile,    NULL,    PAGE_WRITECOPY,    0, 0,    NULL);    // Now map the file   PCHAR pbFile = (PCHAR)::MapViewOfFile(hFileMapping, FILE_MAP_COPY, 0, 0, 0);     // Print result   printf("%s/n", ((string)pbFile).c_str());     // Close all file handle   ::UnmapViewOfFile(pbFile);   ::CloseHandle(hFileMapping);   ::CloseHandle(hFile);     return 0; }