2014.12.3 网络应用

NSData

Foundation

NSURL/NSURLRequest/NSURLConeection

NSNetService/NSNetServiceBrowser

Core Foundation

CFNetwork

CFNetService

BSD Sockets

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（1）获取图片

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1. NSData *data = [[NSData alloc] initWithContentsOfURL:url];
2. NSData *data = [NSData dataWithContentsOfURL:url];

    NSData *data = [[NSData alloc] initWithContentsOfURL:url];
    NSData *data = [NSData dataWithContentsOfURL:url];

例子：

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1. NSAutoreleasePool   *pool = [[NSAutoreleasePool alloc] init];
2. //根据网络数据，获得到image资源
3. NSData  *data = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:self.picUrlString]];
4. UIImage *image = [[UIImage alloc] initWithData:data];
5. [data release];
6. //回到主线程，显示图片信息
7. [self performSelectorOnMainThread:@selector(displayImage:) withObject:image waitUntilDone:NO];
8. [image release];
9. [pool release];

     NSAutoreleasePool   *pool = [[NSAutoreleasePool alloc] init];
    //根据网络数据，获得到image资源
    NSData  *data = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:self.picUrlString]];
    UIImage *image = [[UIImage alloc] initWithData:data];
    [data release];
    //回到主线程，显示图片信息
    [self performSelectorOnMainThread:@selector(displayImage:) withObject:image waitUntilDone:NO];
    [image release];

    [pool release];

异步

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1. NSURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url];
2. NSURLConnection *urlConnection = [[NSURLConnection alloc] initWithRequest:urlRequest delegate:self];

NSURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url];
NSURLConnection *urlConnection = [[NSURLConnection alloc] initWithRequest:urlRequest delegate:self];

（2）GET方法

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1. NSURL *url = [NSURL URLWithString:urlString];
2. NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url];
3. NSHTTPURLResponse *response = [[NSHTTPURLResponse alloc] init];
4. NSData *retData = [NSURLConnection sendSynchronousRequest:theRequest
5. returningResponse:&response error:nil];
6. NSString *retString = [[NSString alloc] initWithData:retData encoding:NSUTF8StringEncoding];

NSURL *url = [NSURL URLWithString:urlString];
NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url];
NSHTTPURLResponse *response = [[NSHTTPURLResponse alloc] init];
NSData *retData = [NSURLConnection sendSynchronousRequest:theRequest
returningResponse:&response error:nil];
NSString *retString = [[NSString alloc] initWithData:retData encoding:NSUTF8StringEncoding];

（3）post方法

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1. NSURL *url = [NSURL URLWithString:urlString];
2. NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url];
3. NSString *postString = @"test=3";
4. NSData *postData = [postString dataUsingEncoding:NSUTF8StringEncoding];
5. NSString *msgLength = [NSString stringWithFormat:@"%d", [postData length]];
6. [theRequest addValue:msgLength forHTTPHeaderField:@"Content-Length"];
7. [theRequest setHTTPMethod:@"POST"];
8. [theRequest setHTTPBody: postData];
9. NSHTTPURLResponse *response =[[NSHTTPURLResponse alloc] init];
10. NSData *retData = [NSURLConnection sendSynchronousRquest:theRequest returningResponse:&response error:nil];