确定命令行程序是否已安装C ++

时间:2013-11-11 17:20:05

标签: c++ command-line system

我试图找出是否安装了命令行程序,以便以后可以使用。

到目前为止,我所尝试的是:

int whichReturn = system("command -v THE_CL_PROGRAM >/dev/null && { exit 50; }|| { exit 60; }");
if (whichReturn == 12800) { //system 'apparently' returns the return value *256 (50*256 = 12800)

    //...

}

然而,它似乎总是返回60,因此失败。

有更简单的方法吗?或者有人可以指出我的错误在哪里?

由于

1 个答案:

答案 0 :(得分:1)

使用which的完整程序:

isthere.cpp:

#include <iostream>
#include <cstdlib>
#include <sstream>

int main(int argc, char* argv[])
{
        std::ostringstream cmd;
        cmd << "which " << argv[1] << " >/dev/null 2>&1";
        bool isInstalled = (system(cmd.str().c_str()) == 0);
        std::cout << argv[1] << " is "<< ((isInstalled)?"":"NOT ") << "installed! << std::endl;
}

输出:

$ ./isthere ls
ls is installed!
$ ./isthere grep
grep is installed!
$ ./isthere foo
foo is NOT installed!