CFStream在设置SOCKS代理配置后崩溃

Question

下面的代码怎么了？我使用AsyncSocket连接到SOCKS代理，并在onSocketWillConnect委托方法上设置代理设置。如果我省略对CFReadStreamSetProperty和CFWriteStreamSetProperty的调用，套接字连接将顺利进行。否则，在没有可跟踪堆栈跟踪(可能与CFNetwork相关？)的已分配实例上，我会得到一个Not类型保留。有人知道是怎么回事吗？

CFDictionaryRef proxyDict = CFNetworkCopySystemProxySettings();
CFMutableDictionaryRef socksConfig = CFDictionaryCreateMutableCopy(NULL, 0, proxyDict);
CFDictionarySetValue(socksConfig, kCFStreamPropertySOCKSProxyHost, CFSTR("192.168.1.148"));
CFDictionarySetValue(socksConfig, kCFStreamPropertySOCKSProxyPort, (__bridge CFNumberRef)[NSNumber numberWithInt:3129]);
CFDictionarySetValue(socksConfig, kCFStreamPropertySOCKSVersion, kCFStreamSocketSOCKSVersion4);

// set SOCKS for read streams
CFReadStreamRef readStream = [sock getCFReadStream];
if (!CFReadStreamSetProperty(readStream, kCFStreamPropertySOCKSProxy, socksConfig)) {
  CFStreamError error = CFReadStreamGetError(readStream);
  NSLog(@"[SEVERE] Web Socket Read Stream Error: %ld[%ld]", error.domain, error.error);
}

// set SOCKS for write stream
CFWriteStreamRef writeStream = [sock getCFWriteStream];
if (!CFWriteStreamSetProperty(writeStream, kCFStreamPropertySOCKSProxy, socksConfig)) {
  CFStreamError error = CFWriteStreamGetError(writeStream);
  NSLog(@"[SEVERE] Web Socket Write Stream Error: %ld[%ld]", error.domain, error.error);
}

// Release
CFRelease(socksConfig);
CFRelease(proxyDict);

Answer 1

来自CFReadStream的文档：

可以设置的属性配置流的行为，并且只能在特定时间(例如在打开流之前)进行修改。(实际上，您应该假设您只能在打开流之前设置属性，除非另有说明。)

onSocketWillConnect设置这些属性可能为时已晚。