100分求助一个关于在线程中read、write pipe的问题！

[u010249954]

想要调用c:\\windows\\system32\\cmd.exe，让用户输入一个字符串，然后显示cmd执行的echo；

但是输入ping 127.0.0.1之后，并没有echo出来任何东西，一开始的cmd是可以显示的！


求助各位一下为何这么样？

下面是我的代码：

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

#define THREAD_NUM 2

HANDLE hReadPipe1, hWritePipe1, hReadPipe2, hWritePipe2;
HANDLE handle[THREAD_NUM];
DWORD byteRead, byteWrite;
string write_message;

unsigned int __stdcall ThreadWritePipe(PVOID pData)
{
	//进程的输入重定向到hReadPipe2，所以从hWritePipe2写入
	while (true)
	{
		if (!write_message.empty())
		{
			if (!WriteFile(hWritePipe2, (LPCVOID)write_message.c_str(), write_message.length() + 1, &byteWrite, NULL))
			{
				return 1;
			}
			else
			{
				write_message = "";
			}
		}
	}
	return 0;
}

unsigned int __stdcall ThreadReadPipe(PVOID pData)
{
	//这个不知道还有没有更好的办法，用while (true)总觉得很土
	BYTE buffer[1024];
	while(true)
	{
		RtlZeroMemory(buffer,1024);
		//进程的输出重定向到hWritePipe1，所以从hReadPipe1读取
		if(ReadFile(hReadPipe1,buffer,1023,&byteRead,NULL) == NULL)
		{
			break;
		}
		cout<<buffer;
		Sleep(20);
	}
	return 0;
}

int main(int argc,char* * argv)
{
	//定义四个句炳保留两个管道的信息
	SECURITY_ATTRIBUTES sat;
	STARTUPINFO startupinfo;
	PROCESS_INFORMATION pinfo;

	string rString;
	string m_Host="c:\\windows\\system32\\cmd.exe ";

	sat.nLength=sizeof(SECURITY_ATTRIBUTES);
	sat.bInheritHandle=true;
	sat.lpSecurityDescriptor=NULL;
	//创建管道，它用来做子进程的输出
	if(!CreatePipe(&hReadPipe1, &hWritePipe1, &sat, NULL))
	{
		cout<<("Create Pipe Error!")<<endl;
		return 1;
	}

	//创建管道，它用来做子进程的输入
	if(!CreatePipe(&hReadPipe2, &hWritePipe2, &sat, NULL))
	{
		cout<<"Create Pipe Error!"<<endl;
		return 1;
	}

	startupinfo.cb=sizeof(STARTUPINFO);
	//用GetStartupInfo获得当前进程的参数，否则STARTUPINFO参数太多，会让人抓狂
	GetStartupInfo(&startupinfo);
	startupinfo.hStdInput = hReadPipe2;
	startupinfo.hStdError = hWritePipe1;
	startupinfo.hStdOutput= hWritePipe1;
	//要有STARTF_USESTDHANDLES，否则hStdInput, hStdOutput, hStdError无效
	startupinfo.dwFlags	  = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
	startupinfo.wShowWindow=SW_HIDE;
	if(!CreateProcess(NULL, (char*)m_Host.c_str(), NULL, NULL, TRUE, NULL, NULL, NULL, &startupinfo, &pinfo))
	{
		cout<<("create process error!")<<endl;
		return 1;
	}

	handle[0] = (HANDLE)_beginthreadex(0, 0, ThreadWritePipe, 0, 0, 0);
	handle[1] = (HANDLE)_beginthreadex(0, 0, ThreadReadPipe,  0, 0, 0);
	
	char str[1024] = {'\0'};
	bool flag = true;
	while(flag)
	{
		gets(str);
		if (str[0] == 'q')
		{
			flag = !flag;
		}
		else
		{
			write_message += str;
		}
	}
	return 0;

	WaitForMultipleObjects(THREAD_NUM, handle, TRUE, INFINITE);

	CloseHandle(hReadPipe1);
	CloseHandle(hReadPipe2);
	CloseHandle(hWritePipe1);
	CloseHandle(hWritePipe2);

	return 0;
}

[u010249954]

在线等！谢谢！

[kyotrue]

WriteFile(hWritePipe2, (LPCVOID)write_message.c_str(), write_message.length() + 1, &byteWrite... 这个，为啥要write_message.length() + 1？结束符不该写进去吧。。。

[u010249954]

引用 2 楼 kyotrue 的回复:

WriteFile(hWritePipe2, (LPCVOID)write_message.c_str(), write_message.length() + 1, &byteWrite... 这个，为啥要write_message.length() + 1？结束符不该写进去吧。。。

写不写其实没关系

[每天看一遍，防止恋爱&&堕落]

unsigned int __stdcall ThreadWritePipe(PVOID pData)
{
	//进程的输入重定向到hReadPipe2，所以从hWritePipe2写入
	while (true)
	{
		if (!write_message.empty())
		{
			write_message += "\r\n";
			if (!WriteFile(hWritePipe2, (LPCVOID)write_message.c_str(), write_message.length(), &byteWrite, NULL))
			{
				printf("execu ThreadWritePipe\n");
				return 1;
			}
			else
			{
				write_message = "";
			}
		}
		Sleep(100);
	}
	return 0;
}

[u010249954]

引用 4 楼 zengraoli 的回复:

C/C++ code?12345678910111213141516171819202122unsigned int __stdcall ThreadWritePipe(PVOID pData){ //进程的输入重定向到hReadPipe2，所以从hWritePipe2写入 while (true) { if (!write_message……

Ok 结贴!