NSTask 未返回

发布于 2024-12-08 10:54:18 字数 703 浏览 0 评论 0原文

我使用 NSTask 如下：

    NSTask *task;
    task = [[NSTask alloc] init];

    [task setLaunchPath:@"/bin/bash"];

    NSMutableString *script = ... // actual script here, works fine

    NSArray *args = [NSArray arrayWithObjects:@"-l",
                     @"-c",
                     script,
                     nil];

    [task setArguments: args];

    NSPipe *pipe = [NSPipe pipe];
    [task setStandardOutput:pipe];

    [task launch];

    NSData *data = [[pipe fileHandleForReading] readDataToEndOfFile];

    [task waitUntilExit];
    [task release];

到目前为止工作正常，唯一的问题是，不知何故，在第一次达到这一点后不再调用该方法。如果我不启动该任务，则一切正常，因此该任务似乎以某种方式阻止了进一步的执行。

有人知道为什么会这样吗？任何提示表示赞赏！

原文

I use a NSTask as follows:

    NSTask *task;
    task = [[NSTask alloc] init];

    [task setLaunchPath:@"/bin/bash"];

    NSMutableString *script = ... // actual script here, works fine

    NSArray *args = [NSArray arrayWithObjects:@"-l",
                     @"-c",
                     script,
                     nil];

    [task setArguments: args];

    NSPipe *pipe = [NSPipe pipe];
    [task setStandardOutput:pipe];

    [task launch];

    NSData *data = [[pipe fileHandleForReading] readDataToEndOfFile];

    [task waitUntilExit];
    [task release];

Works fine so far, only thing is, that somehow, the method isn't called anymore after first reaching this point. If I don't launch the task, everything's ok, so it would seem, that the task somehow blocks further execution.

Has anybody an idea, why that would be? Any hints appreciated!

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半城柳色半声笛 2024-12-15 10:54:18

通过运行循环来更好地控制任务，您可以在循环中读取数据、检查是否超时等：

while ([task isRunning])
{
    NSData* data = [[pipe fileHandleForReading] availableData];
    if ([data length] > 0)
    {
        //process the data
    }

    // Run current runloop in default mode; check the timeout; interrupt the task if needed
}

Get more control on the task by running a loop where you can read the data, check if it's timed out , etc.:

while ([task isRunning])
{
    NSData* data = [[pipe fileHandleForReading] availableData];
    if ([data length] > 0)
    {
        //process the data
    }

    // Run current runloop in default mode; check the timeout; interrupt the task if needed
}

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