iPhone SDK通过wifi发送字符串

后来我想明白了,决定在这里回答我自己的问题,为那些处于类似情况的人着想。

每当我想发送任何字符串时,我都会使用我创建的助手函数:

- (void) send:(NSString *)string {
    const uint8_t *message = (const uint8_t *)[string UTF8String];
    if (_outStream && [_outStream hasSpaceAvailable])
        if([_outStream write:message maxLength:strlen((char *)message)] == -1)
            NSLog(@"Failed sending data to peer");
}

在接收端看起来是这样的:

- (void) stream:(NSStream *)stream handleEvent:(NSStreamEvent)eventCode {

    switch(eventCode) {

    case NSStreamEventHasBytesAvailable:
    {
        if (stream == _inStream) {
            // read it in
            unsigned int len = 0;
            len = [_inStream read:buf maxLength:buffSize];
            buf[len] = '\0';
            if(!len) {
                if ([stream streamStatus] != NSStreamStatusAtEnd)
                        NSLog(@"Failed reading data from peer");
            } else {
                NSString *message = [NSString stringWithUTF8String:(char *)buf];
                // here you do whatever you need with your received NSString *message
            }
        }
    }
}

缓冲区定义为:

#define buffSize 60000
uint8_t buf[buffSize];

60000是相当随意的,你可以改变它以满足你的需要。

NSStreamEvent 如果必要的话。