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2014.12.3 网络应用

2024-08-06 11:52:08   216人阅读

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];  
    NSData *data = http://www.mamicode.com/[[NSData alloc] initWithContentsOfURL: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];  
     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];  
2014.12.3 网络应用






























        

            
                
                  
                
                

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