windows C++捕获CMD命令输出

#include "windows.h"
#include "stdio.h"
#include <string>
#include <iostream>

HANDLE hReadPipeCmd = NULL;
HANDLE hWritePipeCmd = NULL;
HANDLE hReadPipeShell = NULL;
HANDLE hWritePipeShell = NULL;//shell
HANDLE hProcessHandle;        //进程句柄

char readBuff[4096]="x00";
char writeBuff[256]="x00";
//BOOL initPipeSuccess = FALSE;

void initPipe();
//void shell();
DWORD WINAPI shell(LPVOID lpThreadParameter);

int main(int argc, char* argv[])
{
    CreateThread(NULL, 0, shell, NULL, 0, 0);
    std::string cmd;
    while(1)
    {
        //scanf("%s",writeBuff);
        std::cin.getline(writeBuff, sizeof(writeBuff));
        //cmd += "
";
        //memcpy(writeBuff, cmd.c_str(), cmd.size());
        strcat(writeBuff,"
");//这个是关键，必须加上回车换行!否则不会回显！


        //shell();
        //printf("%s", readBuff);//很关键
        //memset(readBuff, 0, sizeof(readBuff));

        //getchar();
    }
}
DWORD WINAPI shell(LPVOID lpThreadParameter)
//void shell()
{
    //if(initPipeSuccess == FALSE)
        initPipe();



    //Sleep(1000);

    unsigned long   BytesRead = 0;
    DWORD TotalBytesAvail;

    //检查管道中是否有数据
    while (PeekNamedPipe(hReadPipeCmd,readBuff, sizeof(readBuff), &BytesRead, &TotalBytesAvail, NULL))
    {
        if (TotalBytesAvail <= 0)
        {
            if (strlen(writeBuff) > 0)
            {
                DWORD dwByteWritten;

                WriteFile(hWritePipeShell, writeBuff, strlen(writeBuff), &dwByteWritten, 0);//写管道
                //printf("写入字节数:%d
", dwByteWritten);
                memset(writeBuff, 0, 256);
            }

            Sleep(600);
        }
        else
        {
            //printf("有数据到来!
");
            memset(readBuff, 0, sizeof(readBuff));
            if(BytesRead==TotalBytesAvail)
            {
                ReadFile(hReadPipeCmd, readBuff, TotalBytesAvail+100, &BytesRead, NULL);
                printf("%s", readBuff);//很关键
                memset(readBuff, 0, sizeof(readBuff));
                //break;
            }
        }
    }
    return 0;
}
//创建双管道和创建cmd进程
void initPipe()
{
    SECURITY_ATTRIBUTES sa = {0};
    STARTUPINFO         si = {0};
    PROCESS_INFORMATION pi = {0};

    sa.nLength = sizeof(sa);
    sa.lpSecurityDescriptor = NULL;
    sa.bInheritHandle = TRUE;
    //创建管道
    CreatePipe(&hReadPipeCmd,&hWritePipeCmd,&sa,0);
    CreatePipe(&hReadPipeShell,&hWritePipeShell,&sa,0);

    GetStartupInfo(&si);
    si.cb = sizeof(STARTUPINFO);
    si.wShowWindow = SW_HIDE;
    si.dwFlags = STARTF_USESTDHANDLES|STARTF_USESHOWWINDOW;
    si.hStdInput = hReadPipeShell;
    si.hStdOutput = si.hStdError = hWritePipeCmd;
    //找到cmd的绝对路径
    char strShellPath[256]="x00";
    GetSystemDirectory(strShellPath, 256);
    strcat(strShellPath,"\cmd.exe");
    //创建cmd进程
    if (!CreateProcess(strShellPath,NULL, NULL, NULL,TRUE,NORMAL_PRIORITY_CLASS, NULL, NULL, &si, &pi))
    {
        //printf("CreateProcess Error!
");
        CloseHandle(hWritePipeCmd);
        CloseHandle(hReadPipeShell);
        //initPipeSuccess = FALSE;
        return;
    }
    hProcessHandle = pi.hProcess;
    //initPipeSuccess = TRUE;
}