NSURLConnection同步，异步与SSL
原文地址：http://qzc770707.blog.163.com/blog/static/3408275320105249566560/
通常在IPhone里用网络访问会用到NSURLConnection来做url链接请求，下面简单介绍一下：
在头文件中加入该语句：
@interface CoursePJViewController :BaseViewController<UITextViewDelegate,NetAccessDelegate,NSURLConnectionDataDelegate>
NSMutableURLRequest *request=[[NSMutableURLRequest alloc]init];
NSError *err=nil;
NSData *data=[NSURLConnection sendSynchronousRequest:request
returningResponse:nil
error:&err];
if(data==nil)
{
//if([err code])
NSLog(@"Code:%d,domain:%@,localizedDesc:%@",[err code],
[err domain],[err localizedDescription]);
}
else
{
}
这种情况，通过一个静态方法，请求request,这种情况下，会一直阻塞，等到返回结果，简单易用
2、异步请求
NSMutableURLRequest *request=[[NSMutableURLRequest alloc]init];
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:requestdelegate:self];
[url release];
[request release];
if(connection)
{
receivedData = [[NSMutableData data] retain];
NSLog(@"intial done!");
}
else
{
NSLog(@"sorry");
}
通过一个delegate来做数据的下载以及Request的接受等等消息，此处delegate:self，所以需要本类实现一些方法，并且定义receivedData做数据的接受
基本上要实现下面节歌方法
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse*)response
{
NSLog(@"get the whole response");
[receivedData setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
NSLog(@"get some data");
[receivedData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
[connection release];
}
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
[connection release];
NSLog(@"Connection failed! Error - %@ %@",
[error localizedDescription],
[[error userInfo] objectForKey:NSErrorFailingURLStringKey]);
}
while(!finished) {
[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDatedistantFuture]];
}
在头文件中加入该语句：
@interface CoursePJViewController :BaseViewController<UITextViewDelegate,NetAccessDelegate,NSURLConnectionDataDelegate>