[fpc-pascal] sending new parameters to existing instance

[wkitty42 at windstream.net]

On 08/27/2017 12:18 PM, James Richters wrote:
> I have a windows console application I wrote with Freepascal.    I can send
> it a command line parameter for a file to use have it working so if I just
> double click on the file I wish to open with my program, it launches and
> opens it.   I am wondering how I can set it up so that double clicking a
> second file will just load the new file into the first instance instead of
> opening a second instance of the program.   I've been thinking up schemes for
> how this could be done, but I think there must be some system in place that
> does this already because a lot windows programs behave this way, just
> loading the new file into the existing instance, but I'm not familiar enough
> with how this is done.   Could someone please point me in the right direction
> on how this is typically done?

i think you're looking for IPC (InterProcess Communication)... with this, the 
second instance would load up, find that there is one already running, tell the 
already running one about the new file to load, and then exit...


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