本文介绍了如何使用 POSIX 在 C++ 中执行命令并获取命令的输出?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在寻找一种在 C++ 程序中运行时获取命令输出的方法.我已经看过使用 system()
函数,但这只会执行一个命令.这是我正在寻找的示例:
I am looking for a way to get the output of a command when it is run from within a C++ program. I have looked at using the system()
function, but that will just execute a command. Here's an example of what I'm looking for:
std::string result = system("./some_command");
我需要运行任意命令并获取其输出.我查看了 boost.org,但没有找到任何可以满足我需求的内容.
I need to run an arbitrary command and get its output. I've looked at boost.org, but I have not found anything that will give me what I need.
推荐答案
#include <cstdio>
#include <iostream>
#include <memory>
#include <stdexcept>
#include <string>
#include <array>
std::string exec(const char* cmd) {
std::array<char, 128> buffer;
std::string result;
std::unique_ptr<FILE, decltype(&pclose)> pipe(popen(cmd, "r"), pclose);
if (!pipe) {
throw std::runtime_error("popen() failed!");
}
while (fgets(buffer.data(), buffer.size(), pipe.get()) != nullptr) {
result += buffer.data();
}
return result;
}
C++11 之前的版本:
Pre-C++11 version:
#include <iostream>
#include <stdexcept>
#include <stdio.h>
#include <string>
std::string exec(const char* cmd) {
char buffer[128];
std::string result = "";
FILE* pipe = popen(cmd, "r");
if (!pipe) throw std::runtime_error("popen() failed!");
try {
while (fgets(buffer, sizeof buffer, pipe) != NULL) {
result += buffer;
}
} catch (...) {
pclose(pipe);
throw;
}
pclose(pipe);
return result;
}
用 _popen
和 _pclose
替换 popen
和 pclose
for Windows.
Replace popen
and pclose
with _popen
and _pclose
for Windows.
这篇关于如何使用 POSIX 在 C++ 中执行命令并获取命令的输出?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!