Listening to serial port on Delphi 7 [closed] Ask Question 5. I am trying to write a program which will listen to the serial input from Arduino board connected via usb, and sending output to serial port (COM4). But I don't know how to get input from serial port in Delphi. I need program to listen to the port, and whenever the input comes, it. Async Professional: Home Project Home Manuals Delveoper's Guide Reference Guide Activex FAQ Downloads. Introduction Async Professional is a collection of native Visual Component Library (VCL) components that provide serial communication facilities for programs created with Borland Delphi and C++Builder.
I have deleted every single directory or file connected with CPort library and class becouse I hate this mess with files. I have added library path to library path variable: c: cport4 source - in my case I have opened: c: cport4 source cportlib1 4.dpk and compile it. I have opened: c: cport4 source dsgncport 14.dpk and compile it - success, now i have clicked install end here is first problem - i`ve received error msg - cannot find cportlib12.bpl as i said before i have added the path to library path I still can`t understand why it wants cportlib12.bpl if i want to install cport for d2010. I have even added the path to bpl: C: Users Public Documents RAD Studio 7.0 Bpl and still nothing. I have also compile cportlib12.dpk but it haven`t solved the problem I think that i need 2 more days and I`ll smash my pc into pieces. Two problems here; 1.
What is your definition of ComDataPacket1Packet? Procedure ComDataPacket1Packet (Sender: TObject; const Str: Ansitstring; var Pos: Integer) not procedure ComDataPacket1Packet (Sender: TObject; const Str: String; var Pos: Integer) Not sure why you're setting the OnPacket inside RxChar Event? ComDataPacket1.OnPacket:=C omDataPack et1Packet; This would cause the event to be assigned each time a char is received; not a problem exactly but very unecessary. Procedure TForm2.ComPort1RxChar(Send er: TObject; Count: Integer); begin ComDataPacket1.OnPacket:=C omDataPack et1Packet; end. Not sure why you're setting the OnPacket inside RxChar Event? ComDataPacket1.OnPacket:=C omDataPack et1Packet; This would cause the event to be assigned each time a char is received; not a problem exactly but very unecessary.
Procedure TForm2.ComPort1RxChar(Send er: TObject; Count: Integer); begin ComDataPacket1.OnPacket:=C omDataPack et1Packet; end; So where should I declare onPacket event? - I have asked Experts how should it looks like, i can create a new question to grant you additional points for this. Not sure why you're setting the OnPacket inside RxChar Event? ComDataPacket1.OnPacket:=C omDataPack et1Packet; This would cause the event to be assigned each time a char is received; not a problem exactly but very unecessary. Procedure TForm2.ComPort1RxChar(Send er: TObject; Count: Integer); begin ComDataPacket1.OnPacket:=C omDataPack et1Packet; end; So where should I declare onPacket event? - I have asked Experts how should it looks like, i can create a new question to grant you additional points for this.
-Delphi tutorial: serial comms, i.e. Using the COM port Bi-directional Communications This has good information, and a search button at the bottom of the page Please don't dismiss it because it isn't full of graphics, scripts, cookies, etc! This tutorial will show you how to write a Delphi program to send data out of your PC over a serial link. The program will also be able to read data arriving on the serial link. If you want to know more about the source and format of these pages.
It may be easier to read this if you re-size the window, so that it does not use the full width of your screen. You can for the application developed in this tutorial. The zip file also includes a compiled copy of the application. The compiled version is hard coded to operate on COM1 at 9600, with no handshake. At 02 Apr 2010, 11:49, British time, this TUTORIAL is a Work-In-Progress!
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But the sourcecode and compiled.exe, available from the link above, are finished. Where we are going In the following we will build an application with three buttons. One will look to see if any data has arrived on the serial port, and the other two will send fixed messages out over the serial port, 'Hello' and 'Bye'. Sounds pretty lame, doesn't it.
The application isn't meant to be 'useful' as it stands. It is meant to give you a stripped down skeleton, on which you can build whatever it is that you are wanting to do with a serial comm port.