C++中如何同步读写文本

写措施: 每个2秒写入文本一个数字;

读措施: 每个5秒读入文本最后一个数字;

写措施代码:

#include <iostream>  
#include <fstream>  
      
#include <windows.h>  
      
using namespace std;  
      
int main (void) {  
      
    ofstream ofs("D:/w.txt");  
    int num = 0;  
    while (1) {  
        ofs << ++num << std::endl;  
        std::cout  << num << std::endl;  
        Sleep(2000);  
    }  
      
    ofs.close();  
      
    return 0;  
}

输出:

读措施代码:

/* 
 * main.cpp 
 * 
 *  Created on: 2014.06.08 
 *      Author: Spike 
 */
      
/*vs 2012*/
      
#include <windows.h>  
#include <fstream>  
#include <iostream>  
#include <string>  
#include <vector>  
      
using namespace std;  
      
int main()  
{  
    vector<string> tmp_files;  
      
    while (1) {  
        Sleep(5000);  
        ifstream infile( "D:/w.txt" );  
        if (!infile) {  
            cout << "fail!" << endl;  
            return 0;  
        }  
      
        string lineContent;  
        while ( getline( infile, lineContent, '\n' ) ){  
            tmp_files.push_back(lineContent);  
        }  
        infile.close();  
      
        std::cout << *(tmp_files.end()-1) << std::endl;  
    }  
      
    /*ofstream outfile( "w2.txt",ios::out ); 
    vector<string>::iterator siter = tmp_files.begin(); 
     
    copy( tmp_files.begin(), tmp_files.end()-1, ostream_iterator<string>(outfile) ); 
    cout << "ok!" << endl; 
    outfile.close();*/
      
    return 0;  
}

输出:

作者：csdn博客 Spike_King