CreateProcess：在C ++ / Windows中将child stdout重定向到父stdout [英] CreateProcess: redirect child stdout to parent stdout in C++/Windows

问题描述

根据MSDN，这将儿童stdout重定向到父级stdout，但它不会，什么是错误的。

According to MSDN this redirects child stdout to parent stdout, but it does not, what is wrong?

   PROCESS_INFORMATION pi;
   STARTUPINFOA si;

   ZeroMemory( &si, sizeof(si) );
   si.cb = sizeof(si);
   ZeroMemory( &pi, sizeof(pi) );
   si.hStdOutput = GetStdHandle(STD_OUTPUT_HANDLE);
   si.hStdError = GetStdHandle(STD_ERROR_HANDLE);
   si.dwFlags |= STARTF_USESTDHANDLES;

   BOOL ret = CreateProcessA( 0, cmd_line, 0, 0, TRUE, CREATE_NO_WINDOW, 0, 0, & si, & pi);

不起作用：

using DuplicateHandle does not help:

HANDLE out, err;//global variables
...
PROCESS_INFORMATION pi;
STARTUPINFOA si;

ZeroMemory( &si, sizeof(si) );
si.cb = sizeof(si);
ZeroMemory( &pi, sizeof(pi) );  
BOOL ret = DuplicateHandle( GetCurrentProcess(), GetStdHandle(STD_OUTPUT_HANDLE),  GetCurrentProcess(), &out, 0, TRUE, DUPLICATE_SAME_ACCESS);//todo check ret
ret = DuplicateHandle( GetCurrentProcess(), GetStdHandle(STD_ERROR_HANDLE),  GetCurrentProcess(), &err, 0, TRUE, DUPLICATE_SAME_ACCESS);//todo check ret

si.hStdOutput = out;
si.hStdError = err;
si.dwFlags |= STARTF_USESTDHANDLES;

ret = CreateProcessA( 0, cmd_line, 0, 0, TRUE, CREATE_NO_WINDOW, 0, 0, & si, & pi);

推荐答案

BOOL ret = CreateProcessA 0，cmd_line，0，0，TRUE，CREATE_NO_WINDOW，0,0，& si，& pi）;

CREATE_NO_WINDOW 会导致此行为，请将其删除：

CREATE_NO_WINDOW causes this behavior, remove it:

BOOL ret = CreateProcessA（0，cmd_line，0，0，TRUE， 0，0，& si，& pi）;

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