![](/img/trans.png)
[英]How do you determine full paths from filename command line arguments in a c++ program?
[英]Determine if command line program is installed C++
我試圖找出是否安裝了命令行程序,以便以后使用。
到目前為止,我嘗試過的是:
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)
//...
}
但是,它似乎總是返回60,因此失敗。
有沒有更簡單的方法可以做到這一點? 還是可以指出我的錯誤在哪里?
謝謝
一個完整的程序,使用which
:
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;
}
輸出:
$ ./isthere ls
ls is installed!
$ ./isthere grep
grep is installed!
$ ./isthere foo
foo is NOT installed!
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.