byte[] getBytes(puffer str)
{
//create big enough byte array
int size = Marshal.SizeOf(str);
byte[] arr = new byte[size];
//pointer to unorganized memory
IntPtr ptr = Marshal.AllocHGlobal(size);
//struct to block of unorganized memory
Marshal.StructureToPtr(str, ptr, true);
//copies to organized memory array
Marshal.Copy(ptr, arr, 0, size);
//clear unorganized memory space
Marshal.FreeHGlobal(ptr);
return(arr);
}
puffer fromBytes(byte[] arr)
{
puffer str = new puffer();
int size = Marshal.SizeOf(str);
//pointer to unorganized memory
IntPtr ptr = Marshal.AllocHGlobal(size);
//byte array to unorganized ptr memory
Marshal.Copy(arr, 0, ptr, size);
//unorganized memory to specified structure
str = (puffer)Marshal.PtrToStructure(ptr, str.GetType());
//clear unorganized memory space
Marshal.FreeHGlobal(ptr);
return(str);
}
public void ReadCallback(IAsyncResult ar)
{
try
{
int bytesRead = cd1.s.EndReceive(ar);
if (bytesRead > 0)
{
//handling of byte message
puf = this.fromBytes(buffer);
switch (puf.id)
{
case 0:
z.FillRectangle(new SolidBrush(Color.White), 0, 0, ClientSize.Width, ClientSize.Height);
this.Refresh();
this.Text = "Wurde Refreshed!";
break;
case 1:
z.DrawString(puf.textmsg, myFont, /* new SolidBrush(Color.FromArgb(puf.color))*/ myBrush, puf.x1, puf.y1);
this.Refresh();
this.Text = "Text gesetzt!";
break;
case 2:
this.Invoke((MethodInvoker)(() => z.DrawLine(myPen, new Point(puf.x2, puf.y2), new Point(puf.x1, puf.y1))));
count++;
if (count % 20 == 0)
{
this.Refresh();
this.Text = "Wurde gemalt!";
}
break;
case 3:
z.DrawLine(myPen, new Point(puf.x2, puf.y2), new Point(puf.x1, puf.y1));
this.Refresh();
this.Text = "Linie gezogen!";
break;
case 4:
z.DrawRectangle(myPen, puf.x1, puf.y1, puf.x2, puf.y2);
this.Refresh();
this.Text = "Rechteck gezogen!!";
break;
}
//End of Byte handling
if (cd1.connected)
{
cd1.s.BeginReceive(buffer, 0, buffer.Length, 0,
new AsyncCallback(ReadCallback), cd1.s);
}
}
}
catch (Exception e)
{
MessageBox.Show(e.ToString());
cd1.statusField.BackColor = Color.Red;
cd1.s.Close();
}
}