cocoa-touch - Cocoa Touch Bonjour如何处理NSNetService地址和uint8_t

Question

我正在尝试让 iOS 应用程序与使用 Bonjour 并使用 HTTP 命令的服务器进行通信。到目前为止，我已经能够找到本地域并找到我正在寻找的特定服务。我能够解析服务的地址，但我不知道如何从地址中获取有用的信息。来自 NSNetService 的地址是一个 NSData 对象，我不知道如何处理它。我需要发送 GET 和 PUT 等命令。哪些 Cocoa 类可以处理这样的事情？

我也尝试从服务获取输入和输出流，但它们似乎是极低级别的流，我不知道如何正确处理缓冲区等等。

[service getInputStream:&inputStream outputStream:&outputStream]

NSOutputStream write 方法接受一个我不知道如何创建的 uint8_t 缓冲区。NSInputStream 读取方法返回一个 uint8_t 缓冲区，我不知道如何解释它。

我可以使用终端命令与该服务器通信。例如，向它发送命令 LIST 会导致它打印出我要查找的文件列表。我如何在 Cocoa 中发送和获取此类信息？

Answer 1

将数据写入输出流，从而将其发送到服务器:

NSString * stringToSend = @"Hello World!\n"; //The "\n" lets the receiving method described below function correctly. I don't know if you need it or not.
NSData * dataToSend = [stringToSend dataUsingEncoding:NSUTF8StringEncoding];
if (outputStream) {
    int remainingToWrite = [dataToSend length];
    void * marker = (void *)[dataToSend bytes];
    while (0 < remainingToWrite) {
        int actuallyWritten = 0;
        actuallyWritten = [outputStream write:marker maxLength:remainingToWrite];
        remainingToWrite -= actuallyWritten;
        marker += actuallyWritten;
    }
}

您可以像这样发送任何数据，只需将其放入 NSData 对象即可。

要从服务器接收数据，请在输入流的 NSStreamDelegate 中使用此代码:

- (void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)streamEvent {
    NSInputStream * istream;
    NSOutputStream * ostream;
    switch(streamEvent) {
        case NSStreamEventHasBytesAvailable:;
            istream = (NSInputStream *)aStream;
            ostream = (NSOutputStream *)CFDictionaryGetValue(connections, istream);

            uint8_t buffer[2048];
            int actuallyRead = [istream read:(uint8_t *)buffer maxLength:2048];
            if (actuallyRead > 0) {
                NSData *data;
                data = [NSData dataWithBytes:buffer length:actuallyRead];
                NSString *string = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]autorelease];
                string = [string stringByReplacingOccurrencesOfString:@"\n" withString:@""];
                //Do something with the string...
            }
                break;
        case NSStreamEventEndEncountered:;
            istream = (NSInputStream *)aStream;
            ostream = nil;
            if (CFDictionaryGetValueIfPresent(connections, istream, (const void **)&ostream)) {
                [self shutdownInputStream:istream outputStream:ostream];
            }
                break;
        case NSStreamEventHasSpaceAvailable:
        case NSStreamEventErrorOccurred:
        case NSStreamEventOpenCompleted:
        case NSStreamEventNone:
        default:
            break;
    }
}

看看Apple's CocoaEcho Sample Code .它应该对您有所帮助。