Question

我正在尝试让iOS应用与使用Bonjour的服务器通信并使用HTTP命令。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得有用的东西。 NSNetService的地址是一个NSData对象，我不知道如何处理它。我需要发送像GET和PUT这样的命令。什么可可类处理这样的事情？

我也试过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写入方法接受一个uint8_t缓冲区，我不知道如何创建。 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此服务器通信。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。如何在Cocoa中发送和获取这样的信息？

Answer 1

将数据写入输出流，因此将其发送到服务器：

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;
    }
}

您可以发送此类数据，只需将其放入NSData对象。

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。它应该对你有帮助。

Cocoa Touch Bonjour如何处理NSNetService地址和uint8_t

1 个答案: