Question

我正在使用EADemo的示例代码。它工作正常并显示MFI设备列表。但是当我试图将正确的测试字符串发送到附件时。它得到了回应。

发送测试字符串的代码：

neech@nicolaw.uk:~ $ touch file_number
neech@nicolaw.uk:~ $ echo 1 > serial_number
neech@nicolaw.uk:~ $ cat serial_number
1
neech@nicolaw.uk:~ $ ls -l
total 8
-rw-r--r--  1 nicolaw  staff  0 25 Oct 14:07 file_number
-rw-r--r--  1 nicolaw  staff  2 25 Oct 14:07 serial_number
neech@nicolaw.uk:~ $ mv "file_number" "file_number_$(< serial_number)"
neech@nicolaw.uk:~ $ ls -l
total 8
-rw-r--r--  1 nicolaw  staff  0 25 Oct 14:07 file_number_1
-rw-r--r--  1 nicolaw  staff  2 25 Oct 14:07 serial_number
neech@nicolaw.uk:~ $

获取响应代码 的UIViewController

- (IBAction)sendStringButtonPressed:(id)sender;
{
    if ([_stringToSendText isFirstResponder]) {
        [_stringToSendText resignFirstResponder];
    }

    const char *buf = [[_stringToSendText text] UTF8String];
    if (buf)
    {
        uint32_t len = (uint32_t)strlen(buf) + 1;
        [[EADSessionController sharedController] writeData:[NSData dataWithBytes:buf length:len]];
    }
}

收到回复：

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    // watch for the accessory being disconnected
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(_accessoryDidDisconnect:) name:EAAccessoryDidDisconnectNotification object:nil];
    // watch for received data from the accessory
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(_sessionDataReceived:) name:EADSessionDataReceivedNotification object:nil];

    EADSessionController *sessionController = [EADSessionController sharedController];

    _accessory = [sessionController accessory];
    [self setTitle:[sessionController protocolString]];
    [sessionController openSession];
    _totalBytesRead = 0;
}

但我的问题是当我向配件发送错误的测试字符串时。我没有得到任何失败的回应。

我需要收到失败的回复。

MFi EADemo示例代码将测试字符串发送到附件

0 个答案: