objective-c - Cocoa 中打开的读取流出现 Posix 错误 14(错误地址)。提示？

Question

我正在遵循CFNetwork编程指南中的示例代码，特别是使用流时防止阻塞部分。我的代码与他们的代码几乎相同(如下)，但是，当我连接到我的服务器时，我收到 posix 错误 14(地址错误 - 是那个错误的 IP 地址吗(除非不是)？我进行的某些调用的内存地址错误？或者什么？!.

我不知道如何调试这个。我对整个 CFNetworking 事情真的很陌生，而且一开始就不是网络方面的专家(我真正喜欢 Java 的一件事:简单的网络!:D)

无论如何，日志如下，代码如下。任何提示将不胜感激。

日志:

[6824:20b] [DEBUG] Compat version: 30000011
[6824:20b] [DEBUG] resovled host.
[6824:20b] [DEBUG] writestream opened.
[6824:20b] [DEBUG] readstream client assigned.
[6824:20b] [DEBUG] readstream opened.
[6824:20b] [DEBUG] *** Read stream reported kCFStreamEventErrorOccurred
[6824:20b] [DEBUG] *** POSIX error: 14 - Bad address
[6824:20b] Error closing readstream
[6824:20b] [DEBUG] Writing int: 0x09000000 (0x00000009)

代码:

+ (BOOL) connectToServerNamed:(NSString*)name atPort:(int)port {
    CFHostRef theHost = CFHostCreateWithName (NULL, (CFStringRef)name);
    CFStreamError error;

    if (CFHostStartInfoResolution (theHost, kCFHostReachability, &error))
    {
        NSLog (@"[DEBUG] resovled host.");
        CFStreamCreatePairWithSocketToCFHost (NULL, theHost, port, &readStream, &writeStream);
        if (CFWriteStreamOpen(writeStream))
        {
            NSLog (@"[DEBUG] writestream opened.");

            CFStreamClientContext myContext = { 0, self, NULL, NULL, NULL };
            CFOptionFlags registeredEvents = kCFStreamEventHasBytesAvailable |
                    kCFStreamEventErrorOccurred | kCFStreamEventEndEncountered;
            if (CFReadStreamSetClient (readStream, registeredEvents, readCallBack, &myContext))
            {
                NSLog (@"[DEBUG] readstream client assigned.");
                CFReadStreamScheduleWithRunLoop(readStream, CFRunLoopGetCurrent(),
                                                kCFRunLoopCommonModes);
                if (CFReadStreamOpen(readStream))
                {
                    NSLog (@"[DEBUG] readstream opened.");
                    CFRunLoopRun();
         // Lots of error condition handling snipped.
        [...]
    return YES;
}


void readCallBack (CFReadStreamRef stream, CFStreamEventType event, void *myPtr)
{
    switch (event)
    {
        case kCFStreamEventHasBytesAvailable:
        {
            CFIndex bytesRead = CFReadStreamRead(stream, buffer, kNetworkyBitsBufferSize); // won't block
            if (bytesRead > 0)                                                  // <= 0 leads to additional events
            {
                if (listener)
                {
                    UInt8 *tmpBuffer = malloc (sizeof (UInt8) * bytesRead);
                    memcpy (buffer, tmpBuffer, bytesRead);
                    NSLog(@"[DEBUG] reveived %d bytes", bytesRead);
                    [listener networkDataArrived:tmpBuffer count:bytesRead];
                }
                NSLog(@"[DEBUG] reveived %d bytes; no listener", bytesRead);
            }
        }
            break;

        case kCFStreamEventErrorOccurred:
            NSLog(@"[DEBUG] *** Read stream reported kCFStreamEventErrorOccurred");
            CFStreamError error = CFReadStreamGetError(stream);
            logError(error);
            [NetworkyBits shutDownRead];
            break;

        case kCFStreamEventEndEncountered:
            NSLog(@"[DEBUG] *** Read stream reported kCFStreamEventEndEncountered");
            [NetworkyBits shutDownRead];
            break;
    }
}

void logError (CFStreamError error)
{
    if (error.domain == kCFStreamErrorDomainPOSIX)                              // Interpret error.error as a UNIX errno.
    {
        NSLog (@"[DEBUG] *** POSIX error: %d - %s", (int) error.error, strerror(error.error));
    }
    else if (error.domain == kCFStreamErrorDomainMacOSStatus)
    {
        NSLog (@"[DEBUG] *** MacOS error: %d", (int) error.error);
    }
    else
    {
        NSLog (@"[DEBUG] *** Stream error domain: %d, error: %d", (int) error.error);
    }
}

Answer 1

奥利，在哪里

buffer

您提供给

CFReadStreamRead()

从哪里来？ EFAULT 是一个错误的缓冲区地址...您确定您实际上已初始化此缓冲区以指向有效的内容吗？这显然是全局性的或有时......这本身就是一个非常糟糕的主意。您应该在函数中分配它，或者它应该是一个 ivar(如果您使用的是 Obj-C)。