Question

我想从服务器读取带有相应URL的流数据，目前我正在尝试使用NSInputStream来读取数据，但是我收到错误“错误2操作无法完成。没有这样的文件或目录” 。 Web开发人员以字节为单位接收数据然后他将该数据转换为Stream，如MemoryStream（byteData）[注意：Web服务是用.net编写的]并且已经将它返回给我。 读取这种数据的方法是什么，我试过AISHTTPRequest得到大小为0字节的文件，我再次尝试了NSURLConnction我得到了大小为0字节的文件，现在我是使用NSInputStream，我得到了在开始时提到的错误。这是我的NSInputStream代码，

请指导我是否可以阅读此类数据是iOS作为前端，如果是的话然后指导我应该如何与这种数据进行交互。如果NSInputStream是与之交互的预期方式，那么我的代码中的问题是什么呢？

- (void)setUpStreamForFile {

    NSString *urlStr = @"http://192.168.1.201/example/example.svc/example?parameter={\"DCU_DocId\":\"05e24018-b728-4ec8-9848-d6cae02bec95\"}";

    // iStream is NSInputStream instance variable
    iStream = [[NSInputStream alloc] initWithFileAtPath:urlStr];
    [iStream setProperty:[NSDictionary dictionaryWithObjectsAndKeys:(id) kCFBooleanFalse,    kCFStreamSSLValidatesCertificateChain, nil ] forKey:(NSString *) kCFStreamPropertySSLSettings];
    [iStream setDelegate:self];
    [iStream scheduleInRunLoop:[NSRunLoop currentRunLoop]
                       forMode:NSDefaultRunLoopMode];
    [iStream open];
}

- (void)stream:(NSStream *)stream handleEvent:(NSStreamEvent)eventCode {
    _data = [[NSMutableData alloc] init];
    int bytesRead=0;

    switch(eventCode) {
        case NSStreamEventHasBytesAvailable:
        {
            if(!_data) {

            }
            uint8_t buf[20480];
            unsigned int len = 0;
            len = [(NSInputStream *)stream read:buf maxLength:20480];
            if(len) {
                [_data appendBytes:(const void *)buf length:len];
                // bytesRead is an instance variable of type NSNumber.
                //[bytesRead setIntValue:[bytesRead intValue]+len];
                bytesRead = bytesRead +len;
                NSLog(@"bytesRead:%d",bytesRead);
            }

            else {
                NSLog(@"no buffer!");
            }

            break;
        }
        case NSStreamEventEndEncountered:
        {
            [stream close];
            [stream removeFromRunLoop:[NSRunLoop currentRunLoop]
                              forMode:NSDefaultRunLoopMode];

            stream = nil; // stream is ivar, so reinit it
            break;
        }
        case NSStreamEventErrorOccurred:
        {
            NSError *theError = [stream streamError];
            UIAlertView *theAlert = [[UIAlertView alloc] initWithTitle:@"" message:[NSString stringWithFormat:@"Error %i: %@",[theError code], [theError localizedDescription]] delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
            NSLog(@"Error %i %@",[theError code], [theError localizedDescription]);
            [theAlert show];

            [stream close];

            break;
        }
        case NSStreamEventOpenCompleted:
        {
            NSLog(@"EventOpen");
        }
        case NSStreamEventHasSpaceAvailable:
        {
             NSLog(@"EventHasSpac");
        }
        case NSStreamEventNone:
        {
            NSLog(@"EventNone");
        }
       }
}

Answer 1

它全部使用NSUrlConnection下载流数据。它得到了解决。

如何从Web服务获取类型流的数据

1 个答案: