How can Windows Sidebar Gadget communicate with my desktop app?

I've got a .NET 2.0 Windows desktop applicatio开发者_JAVA百科n (time-sheets) which i develop and wanted to add a Gadget interface to it (so that app runs hidden and is controlled via the gadget).

What is the easiest way to get my gadget to communicate to my app?

An idea that i had was to have a built-in web server inside the app, and the gadget controls communicates with the app using ajax. However i'm hoping there's a simpler solution.

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You didn't specify what technology the gadget and app were written with, so it's hard to answer. Assuming you can use .NET, WCF with a named-pipes binding would be very simple. Just a few lines of code to set it up.

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We use win32 APIs in one of our gadgets' ActiveX control to communicate with other instances of the same gadget. Unfortunately, I can't give you the code (because I don't have permission and I don't write the .net stuff) but it boils down to using a window (in your case the application window) as a server and the gadget ActiveX control as the client and use the SendMessage function.

You can see an example of using COM interop with windows desktop gadgets at http://www.codeproject.com/KB/gadgets/GadgetInterop.aspx

NB: make sure the interop assembly is in the application's directory and NOT the gadget directory, otherwise you'll run into problems when updating/uninstalling the gadget.