How to resize UIA window for UIAutomation purposes, using C#?

Question

I created some coded UI tests for a Win32 application with Visual Studio. I would like the window size to stay consistent so I want it to resize the application window after I launch the application.

I am launching the application like this:

using (ApplicationUnderTest.Launch(this.UIMap.launchReaderParams.ExePath,
                                   this.UIMap.launchReaderParams.AlternateExePath))   
{

I have looked into possible ways of doing this and found a method called SetWindowPos(). However I am unsure of how to use this because it requires the window handle as one of its parameters. How could I obtain the window handle?

Also, is there a better way to resize my application window?

Answer 1

You can pass the position and size to the application under test by supplying a STARTUPINFO structure to CreateProcess. Now, of course, your problem is to get that STARTUPINFO structure to CreateProcess. I don't know how your Launch method is implemented, but at some point it's going to call either CreateProcess (good; all you have to do is initialize the STARTUPINFO structure appropriately) or ShellExecute (bad, because you can't specify a STARTUPINFO structure).