VB6 - Program Communication

[couttsj]

There are numerous examples of SendMessage useage, and this is my version of communication between 2 programs. The basics came from "www.TheScarms.com", and were adapted to provide a way to issue instructions from one program to another, and pass the results back. The use of a data structure

Private Type COPYDATASTRUCT
    dwData As Long   ' Use this to identify your message
    cbData As Long   ' Number of bytes to be transferred
    lpData As Long   ' Address of data
End Type

provides the ability to identify different types of messages. In this example, I have used the type identifier to distinguish between integer, long, and string variables, but it could be used to identify anything.

J.A. Coutts