使用NSWorkspace launchApplicationAtURL启动应用程序后获取退出状态 [英] Getting exit status after launching app with NSWorkspace launchApplicationAtURL

问题描述

我是Mac编程的新手.我正在将插件移植到OSX.我需要我的应用程序启动第二个应用程序(我不控制其源代码)，然后获取其退出代码.NSWorkspace launchApplicationAtURL非常适合使用所需的参数启动它，但是我看不到如何获取退出代码.设置终止第二个应用程序的通知后，有没有办法得到它?我看到了使用NSTask来获取退出代码的工具.我应该使用那个吗?

I'm kind of new at Mac programming. I am porting a plugin to OSX. I need my application to launch a second app (which I do not control the source for) and then get its exit code. NSWorkspace launchApplicationAtURL works great to launch it with the needed arguments but I can't see how to get the exit code. Is there a way to get it after setting up notification for termination of the second app? I see tools for getting an exit code using NSTask instead. Should I be using that?

推荐答案

NSWorkspace 方法实际上是用于启动独立的应用程序的.根据文档，使用 NSTask 将另一个程序作为子进程运行，并...监视该程序的执行".

The NSWorkspace methods are really for launching independent applications; use NSTask to "run another program as a subprocess and ... monitor that program’s execution" as per the docs.

这是启动可执行文件并返回其标准输出的简单方法-它阻止等待完成:

Here is a simple method to launch an executable and return its standard output - it blocks waiting for completion:

// Arguments:
//    atPath: full pathname of executable
//    arguments: array of arguments to pass, or nil if none
// Return:
//    the standard output, or nil if any error
+ (NSString *) runCommand:(NSString *)atPath withArguments:(NSArray *)arguments
{
    NSTask *task = [NSTask new];
    NSPipe *pipe = [NSPipe new];

    [task setStandardOutput:pipe];     // pipe standard output

    [task setLaunchPath:atPath];       // set path
    if(arguments != nil)
        [task setArguments:arguments]; // set arguments

    [task launch];                     // execute

    NSData *data = [[pipe fileHandleForReading] readDataToEndOfFile]; // read standard output

    [task waitUntilExit];              // wait for completion

    if ([task terminationStatus] != 0) // check termination status
        return nil;

    if (data == nil)
        return nil;

    return [NSString stringWithUTF8Data:data]; // return stdout as string
}

您可能不想阻止，尤其是当这是您的主UI线程，提供标准输入等时.

You may not want to block, especially if this is your main UI thread, supply standard input etc.

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