Vb6 Serial Port Sniffer Source Code
Vb6 Serial Port Sniffer Source Code
Serial Port Data Monitoring. Here is my code. (Author of Visual Basic Programmer's Guide to Serial Communications). CommSniff: COM/serial port sniffer with source code.
Serial Port Sniffer Open Source
If you have control over the first program that talks to you COMM port, why not change the program to pass data received from the port to the 2nd program of yours via remoting or any other type of IPC. Better still if you can write a proxy program that connected to the COMM port, and have 2 of the other program talk to this proxy to get the communication done. Another idea is, if you need to sniff only incoming data, you can get a Y-cable (splitter) and connect to 2 COMM port, each program connects to each COMM port. But you need to make sure the 2nd program is not trying to transmit. In some cases you might need a splitter which only connects the RX pin for the 2nd output. Let me know if you need the diagram. If you don't have 2 COMM, you can easily get a USB-Serial Converter for less than USD10.