How to check for updates from my application?

[Oliver Gärtner]

Hi,

Does anyone know what Chrome does when you click on “About Google Chrome” to check for updates? As far as I understand the Omaha architecture, it runs outside of the applications it updates. So I am wondering how you can trigger the update process from your application and how you can monitor the download/installation process of a new version.

Thanks,

Oliver

[Mark Larson (Google)]

In particular:

interface IGoogleUpdate : IUnknown {
  // @param guid The guid for the app to be updated.
  // @param observer The eventing interface.
  HRESULT CheckForUpdate([in, string] const WCHAR* guid,
                         [in] IJobObserver* observer);

  // @param guid The guid for the app to be updated.
  // @param observer The eventing interface.
  HRESULT Update([in, string] const WCHAR* guid,
                 [in] IJobObserver* observer);
};

Chrome's implementation is here:

https://chromium.googlesource.com/chromium/src/+/master/chrome/browser/google/google_update_win.cc

Most of the work is in the BeginUpdateCheckInternal method. If you're not familiar with the Chromium code, it might be hard to follow all the policy checks, progress and status checking, and error reporting, but it's the only example I've got ;)

--Mark

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[Oliver Gärtner]

Thanks for the pointers, Mark. I will dig in :) Oliver