pipe管道通信时，子进程管道只能while死循环写数据，单次或延迟执行无效

#include<iostream>
#include<windows.h>
#include<thread>
using namespace std;
void msg(int a);
HANDLE hread;
HANDLE hwrite;

HANDLE hread1;
HANDLE hwrite1;
void msg(int a)
{
    cout << "func called";
    char   buffer[2] = { 0 };
    DWORD   bytesRead;
    DWORD   bytesWrite;
    while (true)
    {
        if (ReadFile(hread, buffer, 1, &bytesRead, NULL) == NULL)
            break;
        cout << buffer;
    }
}
void input(int a)
{

}

int main()
{
    SECURITY_ATTRIBUTES   sa;
    sa.nLength = sizeof(SECURITY_ATTRIBUTES);
    sa.lpSecurityDescriptor = NULL;
    sa.bInheritHandle = TRUE;
    if (CreatePipe(&hread, &hwrite, &sa, 0))
    {
        cout << "创建成功" << endl;
    }


    SECURITY_ATTRIBUTES   sb;
    sb.nLength = sizeof(SECURITY_ATTRIBUTES);
    sb.lpSecurityDescriptor = NULL;
    sb.bInheritHandle = TRUE;
    
    if (CreatePipe(&hread1, &hwrite1, &sb, 0))
    {
        cout << "创建成功" << endl;

    }


    cout << "服务器正在启动" << endl;
    STARTUPINFO   si;
    PROCESS_INFORMATION   pi;
    si.cb = sizeof(STARTUPINFO);
    GetStartupInfo(&si);
    si.hStdOutput = hwrite;
    si.hStdError = hwrite;

    si.hStdInput = hread1;
    si.wShowWindow = SW_HIDE;
    si.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
    string temp = "cmd.exe";
    LPSTR command = const_cast<char*>(temp.c_str());
    if (!CreateProcess(NULL, command
        , NULL, NULL, TRUE, 0, NULL, NULL, &si, &pi))
    {
        cout << "进程创建错误" << endl;
    }





    thread mdgloop(msg, 1);
    mdgloop.detach();


        char   buffer[] = { "help" };
        DWORD   bytesRead;
        DWORD   bytesWrite = 0;
        
        while (true)
        {
            WriteFile(hwrite1, buffer, strlen(buffer), &bytesWrite, NULL);//如果添加延迟或单次执行则无法写入            
        }
    
}

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