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; 
}