Objective c n按换行符拆分的任务数据\n

我是objective-C的新手，如果我遗漏了什么，请原谅我。但我们都必须从某个地方开始：）

我有一段代码是从另一个开源项目获得的，它执行一个命令并将结果传递给另一个方法。我需要做的是倾听打印到stdout的每一行，并对每一行做一些事情

我正在使用的代码段如下所示：

    NSMutableArray *args  = [NSMutableArray array];

    NSString *input = [details valueForKey:@"input"];

    for (NSString *i in [input componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]) {
        [args addObject:i];
    }

    NSTask *scriptTask = [NSTask new];
    NSPipe *outputPipe = [NSPipe pipe];

    if ([_NSFileManager() isExecutableFileAtPath:scriptPath] == NO) {
        NSArray *chmodArguments = @[@"+x", scriptPath];

        NSTask *chmod = [NSTask launchedTaskWithLaunchPath:@"/bin/chmod" arguments:chmodArguments];

        [chmod waitUntilExit];
    }

    [scriptTask setStandardOutput:outputPipe];
    [scriptTask setLaunchPath:scriptPath];
    [scriptTask setArguments:args];

    NSFileHandle *filehandle = [outputPipe fileHandleForReading];

    [scriptTask launch];
    [scriptTask waitUntilExit];

    NSData *outputData = [filehandle readDataToEndOfFile];

    NSString *outputString  = [NSString stringWithData:outputData encoding:NSUTF8StringEncoding];

    if (NSObjectIsNotEmpty(outputString)) {
        [self.world.iomt inputText:outputString command:IRCPrivateCommandIndex("privmsg")];
    }

task = new Task("ls");

task.addListener("newline", function(data) {
    somethingElse("sendmsg", data);
});

task.run();

因此，我需要等待命令打印到stdout的每一行新行，而不是等待进程完成然后对结果进行处理

我的背景主要是web开发人员，因此我想如果您使用Node.js和事件发射器，我的目标将类似于以下内容：

    NSMutableArray *args  = [NSMutableArray array];

    NSString *input = [details valueForKey:@"input"];

    for (NSString *i in [input componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]) {
        [args addObject:i];
    }

    NSTask *scriptTask = [NSTask new];
    NSPipe *outputPipe = [NSPipe pipe];

    if ([_NSFileManager() isExecutableFileAtPath:scriptPath] == NO) {
        NSArray *chmodArguments = @[@"+x", scriptPath];

        NSTask *chmod = [NSTask launchedTaskWithLaunchPath:@"/bin/chmod" arguments:chmodArguments];

        [chmod waitUntilExit];
    }

    [scriptTask setStandardOutput:outputPipe];
    [scriptTask setLaunchPath:scriptPath];
    [scriptTask setArguments:args];

    NSFileHandle *filehandle = [outputPipe fileHandleForReading];

    [scriptTask launch];
    [scriptTask waitUntilExit];

    NSData *outputData = [filehandle readDataToEndOfFile];

    NSString *outputString  = [NSString stringWithData:outputData encoding:NSUTF8StringEncoding];

    if (NSObjectIsNotEmpty(outputString)) {
        [self.world.iomt inputText:outputString command:IRCPrivateCommandIndex("privmsg")];
    }

task = new Task("ls");

task.addListener("newline", function(data) {
    somethingElse("sendmsg", data);
});

task.run();

---

希望你能理解我的目标。谢谢

您可以做的是向NSFileHandle添加一个观察者，以便在它读取某些内容时通知您

例如：

[fileHandler readInBackgroundAndNotify];
//Need to set NSTask output pipes
[self.task setStandardOutput: outputPipe];
[self.task setStandardError: outputPipe];

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(readFromTask:) name:NSFileHandleReadCompletionNotification object:fileHandler];

-(void)readFromTask:(NSNotification *)aNotifcation;
    {
        NSData *data = [[aNotifcation userInfo] objectForKey: NSFileHandleNotificationDataItem];
        if (data != 0) {
            NSString *text = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

                // Do something with the text

            [text release];
            [[aNotifcation object] readInBackgroundAndNotify];  
        }
    }

然后有一个通知，你可以添加到任务中，以指示任务何时完成，这样你就可以进行清理

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(taskEnded:) name:NSTaskDidTerminateNotification object:task];



- (void)taskEnded:(NSNotification *) aNotifcation
{
    NSData *data = [[aNotifcation userInfo] objectForKey: NSFileHandleNotificationDataItem];
    if (data != 0) {
        NSString *text = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

    [text release];

}

[self.task release];

}

因此，您可以从代码中删除：

 [scriptTask waitUntilExit];

并将数据处理移到通知中

NSData *outputData = [filehandle readDataToEndOfFile];

NSString *outputString  = [NSString stringWithData:outputData encoding:NSUTF8StringEncoding];

if (NSObjectIsNotEmpty(outputString)) {
    [self.world.iomt inputText:outputString command:IRCPrivateCommandIndex("privmsg")];
}

这是一个粗略的想法，在