Comments by Member 14827175

Member 14827175 1-Mar-21 18:37pm View

Deleted

This might be old, but doesn't this do the Kermit method?
I tried it and was getting reversed bytes (when compared to known good XMODEM calculator). I ended up doing:


private byte[] Crc16ccitt(byte[] bytes)
{
    const ushort poly = 4129;
    ushort[] table = new ushort[256];
    ushort initialValue = 0;
    ushort temp, a;
    ushort crc = initialValue;
    for (int i = 0; i < table.Length; ++i)
    {
        temp = 0;
        a = (ushort)(i << 8);
        for (int j = 0; j < 8; ++j)
        {
            if (((temp ^ a) & 0x8000) != 0)
            temp = (ushort)((temp << 1) ^ poly);
            else
                temp <<= 1;
            a <<= 1;
            }
            table[i] = temp;
    }
    for (int i = 0; i < bytes.Length; ++i)
    {
        crc = (ushort)((crc << 8) ^ table[((crc >> 8) ^ (0xff & bytes[i]))]);
    }
    byte[] _crc = BitConverter.GetBytes(crc);
    Array.Reverse(_crc);
    return (_crc);
}

Member 14827175 1-Mar-21 18:36pm View

Deleted

This might be old, but doesn't this do the Kermit method?
I tried this and was getting reversed bytes (when compared to known good XMODEM calculator). I ended up doing:


private byte[] Crc16ccitt(byte[] bytes)
{
    const ushort poly = 4129;
    ushort[] table = new ushort[256];
    ushort initialValue = 0;
    ushort temp, a;
    ushort crc = initialValue;
    for (int i = 0; i < table.Length; ++i)
    {
        temp = 0;
        a = (ushort)(i << 8);
        for (int j = 0; j < 8; ++j)
        {
            if (((temp ^ a) & 0x8000) != 0)
            temp = (ushort)((temp << 1) ^ poly);
            else
                temp <<= 1;
            a <<= 1;
            }
            table[i] = temp;
    }
    for (int i = 0; i < bytes.Length; ++i)
    {
        crc = (ushort)((crc << 8) ^ table[((crc >> 8) ^ (0xff & bytes[i]))]);
    }
    byte[] _crc = BitConverter.GetBytes(crc);
    Array.Reverse(_crc);
    return (_crc);
}

Member 14827175 27-Feb-21 11:48am View

Good suggestion, just checked the length, it's as expected - 530. But with each iteration it doubles, should I be flushing/clearing it in someway?

Member 14827175 27-Feb-21 11:19am View

OK, I'll update my question with some more details, thanks. And your English is perfectly splendid ;)

Member 14827175 27-Feb-21 11:19am View

Deleted

OK, I'll update my question with some more details, thanks. And your English is perfectly splendid ;)

Member 14827175 27-Feb-21 11:02am View

Sorry @BillWoodruff, I should have mentioned that I was already using memStream.Seek( 0, SeekOrigin.Begin ); Thanks for the suggestion nonetheless.

Member 14827175 27-Feb-21 11:00am View

Yeah they were, I initialized them all but now I'm getting an error saying: Offset and length out of bounds for the array or count is greater than the number of elements from index to the end of the source collection. At System.IO.MemoryStream.Read(Byte[] buffer, Int32 offset, Int32 count)

Member 14827175 27-Feb-21 10:46am View

So I created buffers for my arrays like so:

public byte[] arrInt1 = new byte[128];
public byte[] arrBool1 = new byte[128];
public byte[] arrBool2 = new byte[128];
public byte[] arrBool3 = new byte[128];
public byte[] arrBool4 = new byte[128];
public byte[] arrString1 = new byte[256];
public byte[] arrString2 = new byte[256];
public byte[] arrBool5 = new byte[128];
public byte[] arrBool6 = new byte[128];
public byte[] arrBool7 = new byte[128];
public byte[] arrCrc = new byte[128];

Now the Exception says: Offset and length were out of bounds for the array or count is greater than the number of elements from index to the end of the source collection Are the array buffers too big? I also added memStream.Seek( 0, SeekOrigin.Begin ); as suggested by @BillWoodruff

Member 14827175 27-Feb-21 7:12am View

Thanks, that was a helpful comment.

Member 14827175 26-Feb-21 10:32am View

Thank you.

Member 14827175 26-Feb-21 10:31am View

Thanks, your suggestions helped a lot.

Member 14827175 26-Feb-21 5:16am View

OK, thank you for your input.

Member 14827175 24-Feb-21 13:56pm View

Thank you so much, that was very helpful. I'll look into Progress reporting, it looks interesting.

Member 14827175 19-Feb-21 9:15am View

Deleted

Any idea on were could I find some information to help me grasp this concept? Obviously I'm missing some fundamentals...

Member 14827175 19-Feb-21 7:35am View

Deleted

If I do this: private void btnTcp1_Click(Socket handler, EventArgs e)
I get no more error within the method.
But then the Form Designer is giving out that " No overload for 'btnTcp1.Click' matches delegate 'EventHandler' "

I know you're trying to point me in right direction, but I'm clueless... :/

Member 14827175 17-Feb-21 11:12am View

Thanks, I'll take a look at it in a while.

Member 14827175 17-Feb-21 11:11am View

Thanks I didn't see it yet, I'll take a look

Member 14827175 17-Feb-21 10:11am View

If the StartListening() method is in another class (public class AsynchronousSocketListener), how should I reference it from the UI thread?

Comments by Member 14827175 (Top 18 by date)