运行无效命令时正常退出c ++

问题描述

我正在使用boost从我的应用程序运行命令行命令。我正在使用封装在帮助函数中的以下代码：

tuple<string,int> Utility::runcommand(const string& arguments) const
{
    string response;
    int exitCode;
    try
    {
        ipstream iStream;
        auto childProcess = child(arguments,std_out > iStream);
        string line;

        while (getline(iStream,line) && !line.empty())
        {
            response += line;
        }

        childProcess.wait();
        exitCode = childProcess.exit_code();
    }
    catch (...)
    {
        // log error
        throw;
    }

    return make_tuple(response,exitCode);
}

现在，我有一个仅在具有某些属性的计算机上运行的命令。此方法返回这些机器上的预期响应和错误代码。在其他计算机上，它会引发异常。

我尝试在应该失败的机器上手动运行命令，并返回以下输出：

POWERSHELL
PS C:\Users\xyz> dummy-cmd
dummy-cmd : The term 'dummy-cmd' is not recognized as the name of a cmdlet,function,script file,or operable program. Check the spelling of the name,or if a path was included,verify that the path is correct and try again.
At line:1 char:1
+ dummy-cmd
+ ~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (dummy-cmd:String) [],CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

COMMAND PROMPT
C:\Users\xyz>dummy-cmd
'dummy-cmd' is not recognized as an internal or external command,operable program or batch file.

如何运行它以使其返回非零错误代码而不是抛出异常？

解决方法

这就是您的catch子句用于处理异常的原因。不必将它们扔掉：

tuple<string,int> Utility::RunCommand(const string& arguments) const
{
    string response;
    int exitCode;
    try
    {
        ipstream iStream;
        auto childProcess = child(arguments,std_out > iStream);
        string line;

        while (getline(iStream,line) && !line.empty())
        {
            response += line;
        }

        childProcess.wait();
        exitCode = childProcess.exit_code();
    }
    catch (PlatformNotSupportedException& e)
    {
        std::cerr << "That operation is not supported on this platform." << std::endl;
        exit(1);
    }
    catch (...)
    {
        std::cerr << "Unspecified error occurred." << std::endl;
        exit(1); // give nonzero exit code
        //throw; // take out this
    }

    return make_tuple(response,exitCode);
}