问题描述

当我使用 popen 获取命令的输出时，比如 dir，它会提示一个控制台.

when I use popen to get the output of a command, say dir, it will prompt out a console.

但是，我可以在没有控制台出现的情况下获得命令的输出吗?

however, can I get the output of a command without the appearance of the console?

我正在使用 Visual C++，并希望创建一个库来返回某些命令的输出，例如 dir.

I am using Visual C++ and want to make an Library to return the output of some command, say, dir.

推荐答案

假设 Windows(因为这是唯一普遍存在这种行为的平台):

Assuming Windows (since this is the only platform where this behavior is endemic):

CreatePipe() 来创建通信所需的管道，以及 CreateProcess创建子进程.

CreatePipe() to create the pipes necessary to communicate, and CreateProcess to create the child process.

HANDLE StdInHandles[2]; 
HANDLE StdOutHandles[2]; 
HANDLE StdErrHandles[2]; 

CreatePipe(&StdInHandles[0], &StdInHandles[1], NULL, 4096); 
CreatePipe(&StdOutHandles[0], &StdOutHandles[1], NULL, 4096); 
CreatePipe(&StdErrHandles[0], &StdErrHandles[1], NULL, 4096); 


STARTUPINFO si;   memset(&si, 0, sizeof(si));  /* zero out */ 

si.dwFlags =  STARTF_USESTDHANDLES; 
si.hStdInput = StdInHandles[0];  /* read handle */ 
si.hStdOutput = StdOutHandles[1];  /* write handle */
si.hStdError = StdErrHandles[1];  /* write handle */

/* fix other stuff in si */

PROCESS_INFORMATION pi; 
/* fix stuff in pi */


CreateProcess(AppName, commandline, SECURITY_ATTRIBUTES, SECURITY_ATTRIBUTES, FALSE, CREATE_NO_WINDOW |DETACHED_PROCESS, lpEnvironment, lpCurrentDirectory, &si, &pi); 

这不仅仅是让你走上你希望完成的道路.

This should more than get you on your way to doing what you wish to accomplish.

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