管道程序.很多书上的程序是错误的!_如何解决有名管道主函数被多次引用的问题-优快云博客

本文链接：https://blog.youkuaiyun.com/luhuillll/article/details/2070081

本文通过两个示例展示了如何在Windows环境下使用匿名管道进行进程间通信。第一个示例创建了一个父进程与子进程间的管道，并演示了如何从子进程中读取输出。第二个示例则是一个无限循环的程序，不断向管道中输出信息。

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#include "stdafx.h"
#include "windows.h"
#include <iostream>
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
STARTUPINFO myStartup;
PROCESS_INFORMATION myInfo;
BOOL bReturn;
char readBuf[100];
DWORD bytesRead = 0;
  HANDLE hRead,hWrite,hTmp;
SECURITY_ATTRIBUTES ss;
ss.nLength = sizeof( SECURITY_ATTRIBUTES );
ss.bInheritHandle = TRUE;
ss.lpSecurityDescriptor = NULL;
//create Anonymous Pipe
if( CreatePipe( &hRead , &hWrite , &ss , 0 ) )
  cout<<"Pipe Created OK"<<endl;
else
  cout<<"Pipe Creation Error:"<<GetLastError()<<endl;
hTmp = GetStdHandle( STD_OUTPUT_HANDLE );
SetStdHandle( STD_OUTPUT_HANDLE , hWrite );
GetStartupInfo( &myStartup );

//很多书上没有写这段代码,导致下面的进程并没有把输出写到指定的管道
myStartup.hStdError = hWrite;
myStartup.hStdOutput = hWrite;
myStartup.wShowWindow = SW_HIDE;
myStartup.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
//get server address
bReturn = CreateProcess( _T("..//debug//logger.exe") ,NULL , NULL , NULL , TRUE ,
  NULL , NULL , NULL , &myStartup , &myInfo );
SetStdHandle( STD_OUTPUT_HANDLE , hTmp );
CloseHandle( hWrite );
while( ReadFile( hRead , readBuf , 100 , &bytesRead , NULL ))
{
  readBuf[bytesRead] = '/0';
  printf( "Read %d bytes from pipe[%s]" , bytesRead , readBuf );
}
if( GetLastError() == ERROR_BROKEN_PIPE )
  printf( "Pipe Closed by child process/n" );
else
  printf( "Read Error:%d/n", GetLastError() );
CloseHandle( myInfo.hProcess );
  CloseHandle( myInfo.hThread );
int iii;
cin>>iii;
return 0;
}
//////////////////////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "windows.h"
#include <iostream>
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
int i = 0;
for( ;; )
{
  //printf( "Logging %d/n", i );
  cout<<flush<<"Output Line:"<<i<<endl;
  cerr<<flush<<"Error line"<<i<<endl;
  _flushall();

}
return 1;
}