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| Author | Forum: PowerTCP Emulation for .NET Topic: Breaking up Data into parts |
| sbowyer From: Exeter, RI USA Posts: 4 Member Since: 11/07/11 |
posted November 11, 2011 11:48 AM For the .NET Emulator package, I need to be able to read in data, send all or part of it to the vt component, and also act on it. So it’s a combination of automated and interactive client. If I do a read: data = Telnet.Read(buffer, 0, 1024); and then discover I only really needed 500 bytes of it, I seem to only be able to send the whole thing to the emulator: Telnet.Marshal(data, string.Empty, null); (telnet1_Data part:) vt1.Write(e.Data.Buffer, e.Data.Offset, e.Data.Count); Is there a way I can break up the data to send only the part I want the user to see: Part1 = data.Substr(0,500); Part2 = data.Substr(500, 524); Telnet.Marshal(part1, …); I don’t see anything in the manual page for Data for this |
| Jason Farrar (Admin) From: Oneida, NY USA Posts: 223 Member Since: 07/24/07 Extra Support Options Custom Application Development |
posted November 11, 2011 1:02 PM The e.Data.Buffer is just a byte array so you can use vt1.Write method like this: vt1.Write(e.Data.Buffer,0,500); //Will write the first 500 bytes. vt1.Write(e.Data.Buffer, 500, 564)l //Will write bytes 500-564. |
| sbowyer From: Exeter, RI USA Posts: 4 Member Since: 11/07/11 |
posted November 11, 2011 1:25 PM Thanks very much for the quick response. Unfortunately, the vt1.Write part is too late. The problem is the telnet marshal: Telnet.Marshal(data, string.Empty, null); That's not byte[], it's Data. That's the one I need to split. By the time it gets over to the other side (foreground thread), it's not going to know where to split it. |
| Jason Farrar (Admin) From: Oneida, NY USA Posts: 223 Member Since: 07/24/07 Extra Support Options Custom Application Development |
posted November 11, 2011 3:14 PM Where you are sending in null in the Marshall method you can send the parameters as an int array and cast it in the event like this: Telnet.Marshal(data, string.Empty, new int[]{500,524}); Event: void telnet1_Data(object sender, DataEventArgs e) { int[] writepositions = { e.Data.Offset, e.Data.Count }; //try catch just for safety. try { writepositions = e.UserState as int[]; } catch{} //Received data is marshaled to this function vt1.Write(e.Data.Buffer, writepositions[0], writepositions[1]); vt1.Focus(); } Note that this is just a quick example of how to do this, if I were going to do something like this for a production application I would create a class object to hold the positions instead of just using a raw int array. You could also just pass the bytes you actually want to write as a byte array for the state object and just use that instead of the data object's buffer property. |
| sbowyer From: Exeter, RI USA Posts: 4 Member Since: 11/07/11 |
posted November 15, 2011 11:43 AM Interesting. So if you want to send the whole Data packet, you do: Telnet.Marshal(data, string.Empty, null); If you want to pass only part of the packet, you do: Telnet.Marshal(data, string.Empty, new int[]{500,524}); The telnet1_Data() routine stays the same in both cases because the DataEvent argument is always filled out with the offset and count. This still involves remembering what portion of the Data packet I sent already between calls. I suppose there is nothing like: Data d = Partof(oldData) to create a new Data object to Marshal? |
| Jason Farrar (Admin) From: Oneida, NY USA Posts: 223 Member Since: 07/24/07 Extra Support Options Custom Application Development |
posted November 16, 2011 4:42 PM Thank you for bringing this up. Currently there is not a way to create a new Data object to marshal, we expect to provide this functionality in the next release of PowerTCP Emulation for .NET. |
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