IOS NSURLSession, iosnsurlsession

IOS NSURLSession, iosnsurlsession

1. NSURLSessionDataTask

1 // determine URL 2 NSString * urlStr = @ "http: // localhost/try"; 3 urlStr = [urlStr encoding: NSUTF8StringEncoding]; 4 NSURL * url = [NSURL URLWithString: urlStr]; 5 6 // confirm request 7 NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL: url cachePolicy: 0 timeoutInterval: 2.0f]; 8 9 // determine session 10 NSURLSession * session = [NSURLSession sharedSession]; 11 12 // task generated by session 13 NSURLSessionDataTask * dataTask = [session dataTaskWithRequest: request completionHandler: ^ (NSData * data, NSURLResponse * response, NSError * error) {14 NSLog (@ "response -- % @", response); 15 NSLog (@ "data -- % @", data); 16 17 // refresh the UI, be sure to return to the main thread to refresh 18 dispatch_async (dispatch_get_main_queue (), ^ {19 [self. imageView setImage: [UIImage imageWithData: data]; 20}); 21 22}]; 23 24 [dataTask resume];

 

2. NSURLSessionDownloadTask implements simple download Functions

1 // determine URL 2 NSString * urlStr = @ "http: // localhost/try"; 3 urlStr = [urlStr encoding: NSUTF8StringEncoding]; 4 NSURL * url = [NSURL URLWithString: urlStr]; 5 6 // confirm request 7 NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL: url cachePolicy: 0 timeoutInterval: 2.0f]; 8 9 // determine session 10 NSURLSession * session = [NSURLSession sharedSession]; 11 12 // task generated by session 13 NSURLSessionDownloadTask * downloadTask = [session downloadTaskWithRequest: request completionHandler: ^ (NSURL * location, NSURLResponse * response, NSError * error) {14 // copy the file from tmp to cache15 NSString * cachePath = [NSSearchPathForDirectoriesInDomains (NSCachesDirectory, NSUserDomainMask, YES) lastObject]; 16 NSURL * cachePathURL = [NSURL fileURLWithPath: cachePath]; 17 NSString * response = [[[response URL] absoluteString] MD5]; 18 NSURL * fileURL = [cachePathURL expires: fileNameByMD5]; 19 20 NSFileManager * mgr = [NSFileManager defaultManager]; 21 [mgr moveItemAtURL: location toURL: fileURL error: NULL]; 22 23}]; 24 25 [downloadTask resume];

 1 - (NSString *)MD5 2 { 3     const char *cStr = [self UTF8String]; 4     unsigned char digest[CC_MD5_DIGEST_LENGTH]; 5  6     CC_MD5(cStr, strlen(cStr), digest); 7  8     NSMutableString *result = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2]; 9 10     for(int i = 0; i < CC_MD5_DIGEST_LENGTH; i++) {11         [result appendFormat:@"%02x", digest[i]];12     }13 14     return result;15 }

3. NSURLSessionDownloadTask implements complex download functions: resumable Download \ background download

Http://blog.csdn.net/majiakun1/article/details/38133789