如何将 NSInputStream 转换为 NSString 或如何读取 NSInputStream

Question

我正在尝试将输入流转换为字符串。我要转换的输入流是 NSURLRequest.HTTPBodyStream，显然 httpbody 设置为 null 并在您发出请求后替换为流。我该怎么做呢？这是我目前所拥有的：

#define MAX_UTF8_BYTES 6
    NSString *utf8String;
    NSMutableData *_data = [[NSMutableData alloc] init]; //for easy 'appending' bytes

    int bytes_read = 0;
    while (!utf8String) {
        if (bytes_read > MAX_UTF8_BYTES) {
            NSLog(@"Can't decode input byte array into UTF8.");
            break;
        }
        else {
            uint8_t byte[1];
            [r.HTTPBodyStream read:byte maxLength:1];
            [_data appendBytes:byte length:1];
            utf8String = [NSString stringWithUTF8String:[_data bytes]];
            bytes_read++;
        }
    }

当我打印字符串时，它要么始终为空，要么包含单个字符，甚至不打印 null。有什么建议吗？

Answer 1

知道了。我试图访问的流尚未打开。即便如此，它也是只读的。所以我复制了它然后打开它。但这仍然不对，我一次只读取一个字节（单个字符）。所以这是最终的解决方案：

NSInputStream *stream = r.HTTPBodyStream;
uint8_t byteBuffer[4096];

[stream open];
if (stream.hasBytesAvailable)
{
    NSLog(@"bytes available");
    NSInteger bytesRead = [stream read:byteBuffer maxLength:sizeof(byteBuffer)]; //max len must match buffer size
    NSString *stringFromData = [[NSString alloc] initWithBytes:byteBuffer length:bytesRead encoding:NSUTF8StringEncoding];

    NSLog(@"another pathetic attempt: %@", stringFromData);
}