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我正在尝试使用 SmallSockets 库来创建 TCP 套接字连接。目前，我正在使用一个按钮来简单地测试我从 iPhone 到服务器的连接。这是我的代码的样子：

-(IBAction)btnConnect:(id)sender
{
    bool loopConnection = true;
    while(loopConnection == true)
    {
        Socket *socket;
        int port = 11005;
        NSString *host = @"199.5.83.63";

        socket = [Socket socket];

        @try
        {
            NSMutableData *data;
            [socket connectToHostName:host port:port];
            [socket readData:data];
            //  [socket writeString:@"Hello World!"];

            //** Connection was successful **//
            [socket retain]; // Must retain if want to use out of this action block.
        }
        @catch (NSException* exception) 
        {
            NSString *errMsg = [NSString stringWithFormat:@"%@",[exception reason]];
            NSLog(errMsg);
            socket = nil;
        }
    }
}

当我按下按钮时，我的应用程序冻结。它冻结了以下函数（它是 SmallSockets 库的一部分）：

- (int)readData:(NSMutableData*)data
//
// Append any available data from the socket to the supplied buffer.
// Returns number of bytes received.  (May be 0)
//
{
    ssize_t count;

    // data must not be null ptr

    if ( data == NULL )
    [NSException raise:SOCKET_EX_INVALID_BUFFER 
                    format:SOCKET_EX_INVALID_BUFFER];

    // Socket must be created and connected

    if ( socketfd == SOCKET_INVALID_DESCRIPTOR )
        [NSException raise:SOCKET_EX_BAD_SOCKET_DESCRIPTOR 
                    format:SOCKET_EX_BAD_SOCKET_DESCRIPTOR];

    if ( !connected )
        [NSException raise:SOCKET_EX_NOT_CONNECTED 
                    format:SOCKET_EX_NOT_CONNECTED];

    // Request a read of as much as we can.  Should return immediately if no data.

    count = recv(socketfd, readBuffer, readBufferSize, 0);

    if ( count > 0 )
    {
        // Got some data, append it to user's buffer

        [data appendBytes:readBuffer length:count];
    }
    else if ( count == 0 )
    {
        // Other side has disconnected, so close down our socket

        [self close];
    }
    else if ( count < 0 )
    {
        // recv() returned an error. 

        if ( errno == EAGAIN )
        {
            // No data available to read (and socket is non-blocking)
            count = 0;
        }
        else
            [NSException raise:SOCKET_EX_RECV_FAILED 
                        format:SOCKET_EX_RECV_FAILED_F, strerror(errno)];
    }

    return count;
}

应用卡在行：[data appendBytes:readBuffer length:count]; 然后它在同一行显示：线程 1:EXC_BAD_ACCESS (code=1, address=0x5d18c48b)。我在输出中看到的都是绿色字母的 (lldb)。一旦客户端连接，服务器就会向客户端发送一个 4 字节的数据包。

如果有人能解释为什么我的应用程序在这里崩溃，我会非常感激。我已经敲了几个小时的头，试图找出问题所在。

谢谢！

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1 回答 1

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我不知道这是否是正确的答案，但我要做的第一件事就是立即保留套接字。如果套接字有问题，请在异常处理程序中释放它。

于 2012-06-04T22:48:33.083 回答