[英]How to detect if NSURLConnection sendAsynchronousRequest is finished
[英]NSURLConnection sendAsynchronousRequest - communicating with HTTPS
我正在使用iPhone应用程序,该应用程序从URL提取图像。 我使用的是“ NSData dataWithContentsOfUrl],并且工作正常。 但是随后,您可能已经猜到了,请求是同步的。
我希望请求是异步的。 因此,我尝试使用NSURLConnection的sendAsynchronousRequest()调用。 但这会在方法'didFailWithError'中返回以下错误:
Error Domain = kCFErrorDomainCFNetwork代码= 310“与安全Web代理服务器(HTTPS)通信时出现问题。
有人可以帮忙吗?
这是我的NSURLConnection代码段:
NSURL *url = [NSURL URLWithString:notePicUrl];
NSURLRequest *urlRequest = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:100.0];
//NSOperationQueue *queue = [[NSOperationQueue alloc] init];
NSURLConnection* _connection = [[NSURLConnection alloc] initWithRequest:urlRequest delegate:self startImmediately:NO];
self.port = [NSPort port];
self.runLoop = [NSRunLoop currentRunLoop];
[self.runLoop addPort:self.port forMode:NSDefaultRunLoopMode];
[_connection scheduleInRunLoop:self.runLoop forMode:NSDefaultRunLoopMode];
[_connection start];
while (self.finished != YES ) {
[self.runLoop runUntilDate:[NSDate dateWithTimeIntervalSinceNow: 0.1]];
}
[self.runLoop removePort:[self port] forMode:NSDefaultRunLoopMode];
[_connection unscheduleFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
还有NSURLConnectionDelegate方法(尚未实现;仅进行测试以首先查看其是否有效)...
-(void)connection:(NSURLConnection*)connection didReceiveResponse:(NSURLResponse*)response
{
NSLog(@"didReceiveResponse");
//_data = [[NSMutableData alloc] init]; // _data being an ivar
}
-(void)connection:(NSURLConnection*)connection didReceiveData:(NSData*)data
{
NSLog(@"didReceiveData");
//[_data appendData:data];
}
-(void)connection:(NSURLConnection*)connection didFailWithError:(NSError*)error
{
NSLog(@"didFailWithError %@", [error description]);
// Handle the error properly
}
-(void)connectionDidFinishLoading:(NSURLConnection*)connection
{
NSLog(@"connectionDidFinishLoading");
//[self handleDownloadedData]; // Deal with the data
}
我刚刚解决了这个问题; 我尝试使用简单的代码行:
[[NSURLConnection alloc] initWithRequest:urlRequest delegate:self startImmediately:YES];
然后在Delegate方法中处理数据。 此前,它试图在单独的线程中运行。 这工作正常并且是异步的。
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