CFReadStream - Obj-C中的错误处理

Question

如何处理流中的错误？如果用户连接到错误的网络，我想处理这个问题。谢谢!

代码：

- (void)initNetworkCommunication {
CFReadStreamRef readStream;
CFWriteStreamRef writeStream;
CFStreamCreatePairWithSocketToHost(NULL, (CFStringRef)@"IP HERE", 7777, &readStream, &writeStream);
_inputStream = (NSInputStream *)CFBridgingRelease(readStream);
_outputStream = (NSOutputStream *)CFBridgingRelease(writeStream);

[_inputStream setDelegate:self];
[_outputStream setDelegate:self];

[_inputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[_outputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];

[_inputStream open];
[_outputStream open];
}

Answer 1

我想出了一个对我的案子有用的解决方案。这段代码将在控制台中打印出当前网络的BSSID，我只需使用if -语句检查BSSID是否与首选网络的BSSID匹配：

#import <SystemConfiguration/CaptiveNetwork.h>

//Checks which network the user is connected to.
CFArrayRef myArray = CNCopySupportedInterfaces();
CFDictionaryRef myDict = CNCopyCurrentNetworkInfo(CFArrayGetValueAtIndex(myArray, 0));
NSLog(@"Connected at: %@", myDict);
NSDictionary *myDictionary = (__bridge_transfer NSDictionary*)myDict;
NSString * BSSID = [myDictionary objectForKey:@"BSSID"];
NSLog(@"BSSID is: %@", BSSID);

//Handling wrong/correct BSSID.
if (![BSSID isEqualToString:@"PREFERRED BSSID HERE"]) {
    //Handle error however you want.
}
else {
    //If correct BSSID, handle that here however you want.
}
}