匿名管道

转载

mb5fdb0a4002420 2015-07-18 06:45:00

这种匿名管道，和读写文件类似。最好是一个进程读，一个进程写，适合单向通信，不适于双向通信，双向通信容易导致的问题是有可能，读到自己进程刚才写的内容。

纯手工代码，没有一丝拷贝

父进程代码：

// PipeServer.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <Windows.h>
#include <iostream>
using namespace std;
#define BUFF_SIZE 1024



void Test()
{
    SECURITY_ATTRIBUTES sec_handle = {0};
    sec_handle.bInheritHandle = TRUE;
    sec_handle.lpSecurityDescriptor = NULL;
    sec_handle.nLength = sizeof(sec_handle);

    HANDLE hReadPipe = INVALID_HANDLE_VALUE;
    HANDLE hWritePipe = INVALID_HANDLE_VALUE;
    BOOL bCrtPipeOk = CreatePipe(&hReadPipe,&hWritePipe,&sec_handle,BUFF_SIZE);
    if(!bCrtPipeOk) return ;

    STARTUPINFO siStartInfo;
    ZeroMemory( &siStartInfo, sizeof(STARTUPINFO) );
    siStartInfo.cb = sizeof(STARTUPINFO); 

     PROCESS_INFORMATION piProcInfo; 
     ZeroMemory( &piProcInfo, sizeof(PROCESS_INFORMATION) );

     TCHAR szCommandLine[256] = {0};
     _stprintf_s(szCommandLine,_T("-hReadPipe %d -hWritePipe %d"),hReadPipe,hWritePipe);

      if(!::CreateProcess(
        _T("PipeClient.exe"),
        szCommandLine,
        NULL,
        NULL,
        TRUE,
        0 | CREATE_NEW_CONSOLE,
        NULL,
        NULL,
        &siStartInfo,
        &piProcInfo))
      {
          int nError = ::GetLastError();
          cout<<"创建进程失败:"<<nError<<endl;
          return;
      }


    while(1)
    {
        char szReadBuf[BUFF_SIZE] = {0};
        cout<<"Server Reading....."<<endl;
        DWORD dwReaded = 0;
        BOOL bRead = ::ReadFile(hReadPipe,szReadBuf,BUFF_SIZE,&dwReaded,NULL);
        if(!bRead)
            cout<<"ReadFile Error: "<<::GetLastError()<<endl;
        else
            wcout<<L"Readed content:"<<szReadBuf<<endl;


        cout<<"Server Writeing ... "<<endl;
        char szWrite[] = {"I'm Server"};
        DWORD dwWritten = 0;
        if(!::WriteFile(hWritePipe,szWrite,
            sizeof(szWrite),
            &dwWritten,
            NULL))
        {
            cout<<"Server Write Error:"<<::GetLastError()<<endl;
        }
        else
            cout<<"ServerWrite Ok!!!"<<endl;


        Sleep(1000);
    }
}
int _tmain(int argc, _TCHAR* argv[])
{
    Test();
    system("pause");
    return 0;
}

子进程代码

// PipeClient.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <iostream>
#include <Windows.h>
using namespace std;

void Test(HANDLE hRead,HANDLE hWrite)
{
    char szWrite[] = ("I'm Client!!");
    DWORD dwWritten = 0;
    cout<<"client now Write...."<<endl;
    if(!::WriteFile(hWrite,
        szWrite,
        sizeof(szWrite),
        &dwWritten,
        NULL))
    {
        int nError = ::GetLastError();
        cout<<"写文件出错:"<<nError<<endl;
        return ;
    }


    cout<<"client write finished"<<endl;
    char szRead[256] = {0};
    DWORD dwReaded = 0;
    cout<<"client start read......"<<endl;
    if(!ReadFile(hRead,szRead,sizeof(szRead),&dwReaded,NULL))
    {
        int nError = ::GetLastError();
        cout<<"读文件出错:"<<nError<<endl;
        return ;
    }
    else
        cout<<"client read:"<<szRead<<endl;
}

int _tmain(int argc, _TCHAR* argv[])
{

    if(argc <= 1)
        return 0;


    HANDLE hReadPipe = (HANDLE) _tstoi(argv[1]);
    HANDLE hWritePipe = (HANDLE)  _tstoi(argv[3]);
    //DebugBreak();
    Test(hReadPipe,hWritePipe);
    system("pause");
    return 0;
}