Quoting Alistair George <[EMAIL PROTECTED]>:
> I know how to associate filetypes and link them in the registry, and pass
> command parameters to Delphi, but how do you pass the same parameters to
> myapp once it is running eg if a graphics program, say I click an associate
> item, it opens OK with that, now I click another associate item, but I want
> Windoze to pass the new graphic to my open program and use that as a new
> image. Do I have to do a timer loop or something to keep checking for a new
> incoming paramstr?
What you are doing in effect is exchanging information between programs. What
will happen by default in Explorer is that it will try to start another
instance of your application and pass the commandline parameters to that new
instance. If your application has a multiple instance handler then you will
have to devise a mechanism, whether by OLE, DDE, etc, whereby the new instance
can pass the parameters to the existing instance, and then kill itself. If your
app takes no special actions to identify instances then the file will be opened
in the new instance.
This is a little simplified, because Explorer can also communicate with
applications using DDE, but the mechanism of that is something I don't know
anything about. However I would guess you would be implementing a DDE server or
client in your application, and Explorer's association would be set up to talk
to your app using DDE. If it can then talk to the copy of your app that is
already loaded in memory, then presumably you can transfer the file to the
application.
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