输出未写入res.txt文件 [英] The output is not getting written into res.txt file

问题描述

输出未写入res.txt文件.

The output is not getting written into res.txt file.

#include<iostream>
#include<fstream>
#include<cstdlib>
#include<stdio.h>
#include<process.h>
using namespace std;

void wr_thread(void *pParams)
{
    std::ofstream ot("test.txt");
    for(int i=0;i<10;i++)
        ot<<i<<"\n";
}
void  rd_thread(void *pParams)
{
     char * buffer;
     long size;
     std::ofstream res("res.txt");
     srd::ifstream rd("test.txt");
     int n;
     rd.open("test.txt");
     rd>>n;
     rd.seekg(0,ifstream::end);
     size=rd.tellg();
     rd.seekg(0);

     buffer = new char [size];
     if(!rd)
     {
         cout<<"error\n";
         exit(1);
     }
     else
     {
         rd.read (buffer,size);
         res.write(buffer,size);
     }
     delete []buffer;

     res.close();
     rd.close();
}
int main()
{
     _beginthread(wr_thread, 0, NULL );
     _beginthread(rd_thread, 0, NULL );
     cin>>ip;
     return(0);
}

推荐答案

这里有三个可以解决问题的链接，您可以从此处了解更多信息
http://www.cplusplus.com/doc/tutorial/files/ [ http://www.cplusplus.com/forum/general/12075/ [

here are three links which can solve the problem and you can learn more from here
http://www.cplusplus.com/doc/tutorial/files/[^]
http://www.cplusplus.com/forum/general/12075/[^]
best regards.

嘿，我认为问题出在这里，

Hey i think problem lies here,

int main()
{
     _beginthread(wr_thread, 0, NULL );
     _beginthread(rd_thread, 0, NULL );
     cin>>ip;
     return(0);
}

您正在创建两个线程，并且正在从主线程返回，而无需等待子线程完成工作. _beginthread()的示例

http://msdn.microsoft.com/en-us/library/kdzttdcb.aspx [ ^ ]

另外，当您共享相同的资源时，还必须同步线程.

You are creating two threads and you are returning from the main thread with out waiting for the child threads to do there work.Check this link& example for _beginthread()

http://msdn.microsoft.com/en-us/library/kdzttdcb.aspx[^]

Also you have to synchronize the threads when you are sharing same resources.

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