Question

#region Receiving
public void port_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
    int bytes = serial.BytesToRead;
    byte[] buffer = new byte[bytes];
    serial.Read(buffer, 0, bytes);
    int length = buffer.Length;

    for (int i = 0; i < length; i += 8)
    {
        if (length - i >= 8)
        {
            definition.buffering = BitConverter.ToInt64(buffer, i);
            Console.Write(definition.buffering.ToString());
            //Int64 val = BitConverter.ToInt64(buffer, i);
            foreach (var item in buffer)
            {
                SQLiteConnection sqliteCon = new SQLiteConnection(dBConnectionString);
                //open connection to database
                try
                {
                    string itemcode = item.ToString();
                    sqliteCon.Open();
                    string Query = "insert into EmployeeList (empID,Name,surname,Age) values('" + itemcode + "','" + itemcode + "','" + itemcode + "','" + itemcode + "')";
                    SQLiteCommand createCommand = new SQLiteCommand(Query, sqliteCon);
                    createCommand.ExecuteNonQuery();
                    MessageBox.Show("Saved");
                    sqliteCon.Close();
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                } 
                Console.Write(item.ToString());
            }
        }
        else
        {
            // invalid (last) part.
        }
    }
    //definition.buffering = BitConverter.ToInt64(buffer, 0);


    Console.WriteLine();
    Console.WriteLine(definition.buffering);
    Console.WriteLine();
    Thread thread = new Thread(new ThreadStart(() => ThreadExample.ThreadJob(this)));
    thread.Start();
    thread.Join();


}
#endregion

编辑一个。我尝试发送0xFF，但是此代码中控制台的显示为0。

您好。我有这个代码，执行后，我有一个问题：

An unhandled exception of type 'System.ArgumentException' occurred in mscorlib.dll 

Additional information: Destination array is not long enough to copy all the items in the collection. Check array index and length.

这就是这一点：

definition.buffering = BitConverter.ToInt64(buffer, 0);

我该如何解决这个问题？

Answer 1

我认为你的缓冲区长度不是（至少）8。

MSDN说：

返回在字节数组中指定位置从八个字节转换的64位有符号整数。

在以下情况下获得ArgumentException：

startIndex大于或等于值的长度减去7，并且小于或等于值的长度减去1。

在调用BitConverter.ToInt64方法之前，您应该检查

serial.BytesToRead.Length >= 8

要浏览所有字节，请尝试以下操作：

int length = buffer.Length;

for (int i = 0; i < length; i += 8)
{
    if (length - i >= 8)
    {
        Int64 val = BitConverter.ToInt64(buffer, i);
    }
    else
    {
        // invalid (last) part.
    }
}

执行这段代码时出错

1 个答案: