PROSAGA码农传奇-场景模型-WINAPI CreateProcess子进程未运行

<div class =“post-text”itemprop =“text”>
  
    您的代码中存在一些错误。
  
  
    第一，
  
  
     <code>
 childOutRead = GetStdHandle(STD_OUTPUT_HANDLE);
 parentInRead = GetStdHandle(STD_INPUT_HANDLE);

</code>
    
从CreatePipe获取2个句柄，已经重置为stdhandle，并丢失了管道句柄。
  
  
    第二，
  
   <pre>
 <code>
 CreatePipe(&childOutWrite, &childOutRead, &secAttr, 0);

</code>
 </pre>
  
    应该
     <code>
 CreatePipe(&childOutRead, &childOutWrite, &secAttr, 0)
 </code>
  
  
    第三，
  
  
    SetHandleInformation（）中的句柄不正确。
  
  
    好吧，让我们回答你的问题。
  
  
    对于隐藏子进程，其stdin / stdout句柄被设置为管道句柄，因此您无法看到控制台，但它确实在后台运行。
我对您的示例做了一些更改（为简单起见，不使用异步）：
  
  
    Parent.cpp
  
   <pre>
 <code>
 #include <windows.h> 
#include <iostream>
#include <stdio.h>

HANDLE childInRead = NULL;
HANDLE W1 = NULL;
HANDLE W2 = NULL;
HANDLE R2 = NULL;

HANDLE R1 = NULL;

#define BUFSIZE 4096

void CreateChildProcess() {
    TCHAR applicationName[] = TEXT("ChildTalk.exe");
    PROCESS_INFORMATION pi;
    STARTUPINFO si;
    BOOL success = FALSE;

ZeroMemory(&pi, sizeof(PROCESS_INFORMATION));
    ZeroMemory(&si, sizeof(STARTUPINFO));

si.cb = sizeof(STARTUPINFO);
    si.hStdError = W1;
    si.hStdOutput = W1;
    si.hStdInput = R2;
    si.dwFlags |= STARTF_USESTDHANDLES;

success = CreateProcess(NULL, applicationName, NULL, NULL, TRUE, CREATE_NEW_CONSOLE, NULL, NULL, &si, &pi);

if (!success) {
        printf("Error creating child process \n");
    }
    else {
        printf("Child process successfuly created \n");
        CloseHandle(pi.hProcess);
        CloseHandle(pi.hThread);
    }
}

int main()
{
    printf("Parent process running.... \n");

DWORD dRead, dWritten;
    CHAR chBuf[BUFSIZE] = "hello";
    BOOL bSuccess = FALSE;

SECURITY_ATTRIBUTES secAttr;
    secAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
    secAttr.bInheritHandle = TRUE;
    secAttr.lpSecurityDescriptor = NULL;

printf("Creating first pipe \n");

if (!CreatePipe(&R1, &W1, &secAttr, 0)) {
        printf("\n error creating first pipe \n");
    }
    printf("Creating second pipe \n");

if (!CreatePipe(&R2, &W2, &secAttr, 0)) {
        printf("\n error creating second pipe \n");
    }

if (!SetHandleInformation(R1, HANDLE_FLAG_INHERIT, 0)) {
        printf("\n R1 SetHandleInformation \n");
    }
    if (!SetHandleInformation(W2, HANDLE_FLAG_INHERIT, 0)) {
        printf("\n W1 SetHandleInformation \n");
    }

printf("\n Creating child process..... \n");

HANDLE hStdOut = GetStdHandle(STD_OUTPUT_HANDLE);
    HANDLE hStdIn = GetStdHandle(STD_INPUT_HANDLE);
    CreateChildProcess();
    for (;;) {
        printf("Inside for loop \n");

//1. read from stdin
        bSuccess = ReadFile(hStdIn, chBuf, BUFSIZE, &dRead, NULL);
        if (!bSuccess) {
            printf("error reading \n");
            break;
        }

//2. write to Pipe2
        bSuccess = WriteFile(W2, chBuf, 100, &dWritten, NULL); 
        if (!bSuccess) {
            printf("error reading \n");
            break;
        }

//3. read from Pipe1
        bSuccess = ReadFile(R1, chBuf, BUFSIZE, &dRead, NULL);
        if (!bSuccess) {
            printf("error reading \n");
            break;
        }

//4. write to stdout
        bSuccess = WriteFile(hStdOut, chBuf, 100, &dWritten, NULL);
        if (!bSuccess) {
            printf("error reading \n");
            break;
        }
    }
    return 0;
}

</code>
 </pre>
  
    它的逻辑过程：