Windows API design

[roderich]

hi Frankly,

You have various ways for communication between processes, for example OLE, COM, messaging .... or just creating DLL's instead of EXE files.

I would propose a simple messaging via SendMessage from/to the C program. In this case You have to modify the source of the C programs to tell them the handle of the associated Delphi program's form (e.g. via runtime parameter). Another way is to call FindWindow from the C program to get the correct form handle.

Then send a message to the other form by calling
SendMessage(WM_CopyData, handle, hwnd, pcds)
where
handle is address handle
hwnd is handle of sending window
pcds points to a structure to transfer

regards
Roderich