NSTask实时监控输出

Question

我似乎无法监控我的NSTask命令的输出。据我所知，必须使用NSNotificationCenter。我正在尝试运行的终端命令使用各种加密方法从我的安全服务器下载一个文件(在objective-c中重写它将是一个主要的痛苦)。我需要监控结果，以便我可以收到完成下载的百分比。

这是我到目前为止所掌握的

NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];

task = [[NSTask alloc]  init];
pipe = [[NSPipe alloc] init];

NSDictionary *defaultEnvironment = [[NSProcessInfo processInfo] environment];
NSMutableDictionary *environment = [[NSMutableDictionary alloc] initWithDictionary:defaultEnvironment];
[environment setObject:@"YES" forKey:@"NSUnbufferedIO"];
[task setEnvironment:environment];

[task setLaunchPath:[[NSBundle mainBundle] pathForResource:@"servDecryptor" ofType:nil]];
[task setArguments:[NSArray arrayWithArray:arguments]];
[task setStandardOutput:pipe];

fh = [pipe fileHandleForReading];

[nc addObserver:self
       selector:@selector(ready:)
           name:NSFileHandleReadCompletionNotification
         object:fh];
[nc addObserver:self
       selector:@selector(decFinished:)
           name:NSTaskDidTerminateNotification
         object:task];

[task launch];

[fh readInBackgroundAndNotify];

和

    //Ready method
    [[pipe fileHandleForReading] readInBackgroundAndNotify];
NSData *d;
d = [[note userInfo] valueForKey:NSFileHandleNotificationDataItem];

if ([d length] > 0) {
    NSString *s = [[NSString alloc] initWithData:d          encoding:NSUTF8StringEncoding];

}

请注意:下载开始并继续进行，而不会进入我的第二个方法。但是，应用程序在下载完成和进程结束后崩溃。

Answer 1

-(void)uploadData
{
setenv([@"PASSWORD" UTF8String], [mPassword UTF8String], 1);
[task setLaunchPath:executablePathRoot];
[task setArguments:array];
NSPipe *pipe = [NSPipe pipe];
NSPipe *errorPipe = [NSPipe pipe];
[task setStandardOutput:pipe];
[task setStandardError:errorPipe];
//keeps your log where it belongs
//[task setStandardInput:[NSPipe pipe]];

NSFileHandle *outFile = [pipe fileHandleForReading];
NSFileHandle *errFile = [errorPipe fileHandleForReading];


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

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(outData:)
                                             name:NSFileHandleDataAvailableNotification
                                           object:outFile];

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(errData:)
                                             name:NSFileHandleDataAvailableNotification
                                           object:errFile];


[outFile waitForDataInBackgroundAndNotify];
[errFile waitForDataInBackgroundAndNotify];
NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
while(!terminated) 
{
    if (![[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]]) 
    {
        break;
    }
    [pool release];
    pool = [[NSAutoreleasePool alloc] init];
}
[pool release];

[self appendDataFrom:outFile to:output];
[self appendDataFrom:errFile to:error];
//[task waitUntilExit];
[task release];
}


-(void) outData: (NSNotification *) notification
{
NSLog(@"outData");
NSFileHandle *fileHandle = (NSFileHandle*) [notification object];
[self appendDataFrom:fileHandle to:output];
[fileHandle waitForDataInBackgroundAndNotify]; //Checks to see if data is available in a background thread.
}


-(void) errData: (NSNotification *) notification
{
NSLog(@"errData");
NSFileHandle *fileHandle = (NSFileHandle*) [notification object];
[self appendDataFrom:fileHandle to:output];
[fileHandle waitForDataInBackgroundAndNotify];
}

- (void) terminated: (NSNotification *)notification
{
NSLog(@"Task terminated");
[[NSNotificationCenter defaultCenter] removeObserver:self];
terminated =YES;
}