文件锁简单操作（lockfileEx\unlockfileEx）

#include "stdafx.h"
#include <Windows.h>
#include <iostream>

using namespace std;

int _tmain (int argc, LPTSTR argv[])
{

OVERLAPPED Oapped;
    FILE*fp=NULL;
    HANDLE hDir = CreateFile( argv[1],                   // lpFileName
                           GENERIC_WRITE | GENERIC_READ,               // dwDesiredAccess
                           0,                          // dwShareMode
                           NULL,                       // lpSecurityAttributes
                           CREATE_ALWAYS,              // dwCreationDisposition
                           FILE_ATTRIBUTE_NORMAL, // dwFlagsAndAttributes
                           NULL );

int i=LockFileEx(hDir, LOCKFILE_FAIL_IMMEDIATELY, (DWORD)0, (DWORD)200,  (DWORD)0, &Oapped);

if (i!=0)
　　{
        cout<<"file lock success!!"<<endl;
        Sleep(10000);
　　}

int n =UnlockFileEx(hDir, (DWORD)0, (DWORD)200,(DWORD)0, &Oapped);

　CloseHandle(hDir);

if (n!=0)
  {cout<<"file unlock success!!"<<endl;
 
         Sleep(1000);

　　if((fp=fopen("e:\\test.txt","w"))==NULL)
      　　  {
                cout<<"Can't open !"<<endl;
     　　   }
　　else
    　　  {
        cout<<"open success!";
     　　 }
}

system("pause");
    return 0;
}