关于匿名管道，重定向PING中的数据。

//网上摘抄的例子：原示例有错误，经修改如下。// Pipe.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <windows.h>
#include <stdlib.h>

void go(HWND hwnd)
{
char * ping = "IPCONFIG"; // 命令
char pbuf[1024]; // 缓存
DWORD len;
STARTUPINFO si;
PROCESS_INFORMATION pi;
HANDLE hRead1, hWrite1; // 管道读写句柄
BOOL b;
SECURITY_ATTRIBUTES saAttr;

saAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
saAttr.bInheritHandle = TRUE; // 管道句柄是可被继承的
saAttr.lpSecurityDescriptor = NULL;

// 创建匿名管道，管道句柄是可被继承的
b = CreatePipe(&hRead1, &hWrite1, &saAttr, 1024);
if (!b)
{
MessageBox(hwnd, "管道创建失败。","Information",0);
return ;
}

memset(&si, 0, sizeof(si));
si.cb = sizeof(si);
si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
si.wShowWindow = SW_HIDE;
si.hStdOutput = hWrite1; // 设置需要传递到子进程的管道写句柄

// 创建子进程，运行ping命令，子进程是可继承的
if (!CreateProcess(NULL, ping, NULL, NULL, TRUE, 0, NULL, NULL, &si, &pi))
{
itoa(GetLastError(), pbuf, 10);
MessageBox(hwnd, pbuf,"Information",0);
CloseHandle(hRead1);
CloseHandle(hWrite1);
return ;
}

// 写端句柄已被继承，本地则可关闭，不然读管道时将被阻塞
CloseHandle(hWrite1);

// 读管道内容，并用消息框显示
len = 1000;
DWORD l;

while (ReadFile(hRead1, pbuf, len, &l, NULL))
{
if (l == 0) break;
pbuf[l] = '/0';
MessageBox(hwnd, pbuf,"Information",0);
len = 1000;
}

MessageBox(hwnd, "ReadFile Exit","Information",0);
CloseHandle(hRead1);

return ;

}

int main(int argc, char* argv[])
{

go( NULL );
return 0;
}