IOS开发之－－－网络应用

NSData

Foundation

NSURL/NSURLRequest/NSURLConeection

NSNetService/NSNetServiceBrowser

Core Foundation

CFNetwork

CFNetService

BSD Sockets

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1.   

（1）获取图片

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1. NSData *data = [[NSData alloc] initWithContentsOfURL:url];  
2. 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.   
10. [pool release];  

异步

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1. NSURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url];  
2. 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];  

（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:&resp