Question

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测试我与iPhone的服务器连接。这是我的代码：

-(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，我的应用程序冻结了。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;
}

该应用程序在该行冻结：[data appendBytes：readBuffer length：count];然后它在同一行说：线程1：EXC_BAD_ACCESS（代码= 1，地址= 0x5d18c48b）。我在输出中看到的只是（lldb）绿色字母。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。

如果有人能说明我的应用程序崩溃的原因，我真的很感激。我现在已经敲了几个小时试图找出问题所在。

谢谢！

Answer 1

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。如果您对套接字有问题，请在异常处理程序中将其释放。

SmallSocket导致应用程序在iPhone上崩溃

1 个答案: