小编Swe*_*ady的帖子

我在iPad上测试了这段代码:

// execute the function when press button
- (IBAction)connect:(id)sender {
    //[super viewDidLoad];

    AsyncSocket *socket1=[[AsyncSocket alloc] initWithDelegate:self];
    BOOL pass = [socket1 connectToHost:@"www.126.com" onPort:80 error:nil];   // but when I break the wifi?connecttohost still return yes
    if(pass)
    {
        [connectbtn setTitle:@"connected" forState:UIControlStateNormal];
    }

    [socket1 readDataWithTimeout:3 tag:1];
    [socket1 writeData:[@"GET / HTTP/1.1\n\n" dataUsingEncoding:NSUTF8StringEncoding] withTimeout:3 tag:1];

}

请参阅上面代码中的注释.

当我断开Wifi connecttohost返回时yes.我不知道问题出在哪里.谁能帮助我并给我一些指示？

我用getUserMedia()HTML5 成功获得了本地摄像机的视频流.但只有一台摄像机.我有两台摄像机,如何同时获取视频流.

我有三种编写此代码的方法.第三种方式让我困惑.

第一种方式很好.

//.h
@property (weak, nonatomic) IBOutlet UIImageView *picImageStage;
//.m
NSString *name = [NSString stringWithFormat:@"allen.png"];
UIImage *image = [UIImage imageNamed:name];
UIImageView *t = [[UIImageView alloc]initWithImage:image];
self.picImageStage = t;

第二种方式很好.

//.h
@property (retain, nonatomic) IBOutlet UIImageView *picImageStage;
//.m
NSString *name = [NSString stringWithFormat:@"allen.png"];
UIImage *image = [UIImage imageNamed:name];
self.picImageStage = [[UIImageView alloc]initWithImage:image]; 

第三种方式错了.

//.h
@property (weak, nonatomic) IBOutlet UIImageView *picImageStage;
//.m
NSString *name = [NSString stringWithFormat:@"allen.png"];
UIImage *image = [UIImage imageNamed:name];
self.picImageStage = [[UIImageView alloc]initWithImage:image]; 

我不明白原因.谁能帮助我？感谢:D

bail:
    if ( err && image ) {
        CGImageRelease( image );
        image = NULL;
    }
    if ( provider ) CGDataProviderRelease( provider );
    if ( colorspace ) CGColorSpaceRelease( colorspace );
    *imageOut = image;
    return err;

我看了一些代码,发现了这个.我以前从未见过这个.什么bail:意思？

它来自这里.