Creating a daemon from a dll
lazarus / 34-Windows

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Robert Gilland · 2015-12-09 11:24

HI,

wanting to create a daemon, that on before install and before
uninstall, loads a dll, to fill out the Tdaemonmapper properties.
So basically the daemon is a shell to run code that is stored in a
dll.

Then when windows runs the srevice, it passes the daemon the dll path
as a parameter, and the daemon executes a function within the daemon.

Do you think it is possible.

I am doing this because I want to have the code fully debuggable
inside a dll, which can either be run via a executable for dubugging
purposes, or via windows services for stability.

Kind Regards,

Robert.

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Robert Gilland · 2015-12-11 03:43

OK after much trial and error I found you can add a parameter to a
service directly via the registry at
\SYSTEM\CurrentControlSet\Services\

And this approach is possible

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balazsszekely · 2015-12-11 07:37

@Robert Gilland
What about adding the dll as resource to the service, then load it
directly from memory? No parameters needed.

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Robert Gilland · 2015-12-11 12:00

Because I want the dll to be completely independent of the service. So
I  can compile the service once and each time I need a new service. I
just install it as a command line option. So I  write the service
once. Still testing but results are looking good . Also my dll is
written in Delphi.

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Robert Gilland · 2015-12-13 01:05

The situation has become dire:

I am not able to stop the daemon with error:

The specified resource type cannot be found in the image file

Which leads me to "GetMem" response. Could you please indicate how you
would add the DLL as a resource, without using parameters?

Kind Regards,

Robert.

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balazsszekely · 2015-12-13 07:26

@Robert Gilland
1. You can find a small dll inside TestDll folder. The dll exports a
function which add two numbers. You can also find a DllRes.rc file,
from which I created the DllRes.RES.
2. The main project loads the dll from resource then calls function
Add from memory. Nothing is saved to HDD.