NSInputStream 没有收到所有数据

Question

当我从服务器接收数据时出现错误（数据只是字符串）。

例如
服务器发送的数据（15000 字节）
我的 iPhone 收到数据（7878 字节）

所以我尝试搜索，我知道方法是答案。

但我无法应用我的代码..

我猜 NSMutableData 是提示..

怎么做..

这是我的代码。

- (void)stream:(NSStream *)theStream handleEvent:(NSStreamEvent)streamEvent {

NSLog(@"stream event %lu", (unsigned long)streamEvent);

switch (streamEvent) {

    case NSStreamEventOpenCompleted:
        NSLog(@"Stream opened");

        if(_connectServer)
        {
            [_connectServer invalidate];
            _connectServer = nil;
        }

        break;
    case NSStreamEventHasBytesAvailable:

        if (theStream == inputStream)
        {
            if(!_serverOpen)
            {
                uint8_t buffer[1024];

                int len;

                while ([inputStream hasBytesAvailable])
                {
                    len = (int)[inputStream read:buffer maxLength:sizeof(buffer)];

                    if (len > 0)
                    {
                        NSString *output = [[NSString alloc] initWithBytes:buffer length:len encoding:NSUTF8StringEncoding];

                        if (nil != output)
                        {

                            [self receivedServerData:output];

                            if(!_serverOpen)
                            {
                                [self initNetworkCommunicationWithIpPort:output];
                            }

                        }
                    }
                }
            }

            else
            {
                uint8_t buffer[20];

                int len;

                while ([inputStream hasBytesAvailable])
                {
                    len = (int)[inputStream read:buffer maxLength:sizeof(buffer)];

                    NSString* strBuffer = [[NSString alloc] initWithBytes:buffer length:len encoding:NSUTF8StringEncoding];
                    NSLog(@"STRBUFFER %@", strBuffer);

                    strBuffer = [strBuffer substringFromIndex:7];

                    uint8_t dataBuffer[[strBuffer intValue]];

                    NSLog(@"databuffer %lu", sizeof(dataBuffer));

                    int lenBuffer = [inputStream read:dataBuffer maxLength:sizeof(dataBuffer)];

                    NSLog(@"lenBuffer %d", lenBuffer);

                    int position = 0 ;

                    if (lenBuffer > 0)
                    {
                        NSString *output = [[NSString alloc] initWithBytes:dataBuffer length:lenBuffer encoding:NSUTF8StringEncoding];

                        if (nil != output)
                        {
                            [self receivedServerData:output];

                            if(!_serverOpen)
                            {
                                [self initNetworkCommunicationWithIpPort:output];
                            }
                        }
                    }
                }
            }
        }
        else
        {
            NSLog(@"333");
        }
        break;

    case NSStreamEventHasSpaceAvailable:
    {
    }
        break;

    case NSStreamEventErrorOccurred:
        NSLog(@"Can not connect to the host!");
        _serverOpen = NO;

        break;

    case NSStreamEventEndEncountered:
        [theStream close];
        [theStream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
        theStream = nil;

        break;
    default:
        NSLog(@"Unknown event");
}
}

Answer 1

如果您可以访问发送数据的服务器，最简单的方法是将前 4 个字节设置为 int，代表数据的长度。然后解析数据中的前 4 个字节并读取长度。然后，当输入流上有 space 可用时，一旦你有了长度，就继续将字节附加到 NSMutableData 属性，直到接收者有你在开始时得到的 length。一旦完成，然后立即将其转换为字符串。由于网络延迟问题，您无法确定是否会立即在流中接收到所有数据。

Answer 2

正如@Manav 所述，您可以期望以多个块的形式接收流，只需将每个块附加到 NSMutableData，直到获得 NSStreamEventEndEncountered.

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