In coded ui how do you correctly retrieve a browser window that contains an embedded Adobe PDF reader in browser

Question

I'am running across this issue when I'm debugging or running my coded UI automation project, where i get the exception labeled "{"COM object that has been separated from its underlying RCW cannot be used." System.Exception {System.Runtime.InteropServices.InvalidComObjectException}"
everytime i come from a browser window that contains a pdf reader embedded in it. This happens every time I retrieve the window and try to click back. It barfs when i perform the back method on it. I've tried different things but none has worked including
the playback wait.
var hereIsmypdf = ReturnPDFDoc();
public BrowserWindow ReturnPDFDoc()
Playback.Wait(1000);
var myPdFdoc = GlobalVariables.Browser;
return myPdFdoc;
hereIsmypdf.Back();
skinny_Will

Answer 1

Hi skinny_Will,
<<"{"COM object that has been separated from its underlying RCW cannot be used." System.Exception {System.Runtime.InteropServices.InvalidComObjectException
According this exception error message, I did some research about it. I know that this exception error is occurred in
COM object which was disposed if you are using the COM objects in a same static class or variables which ware shared between tests.
So please you refer the following blog to use ExecutionThread element to instruct the test to use the MTA threading model. This way, the static instance of "store" can be shared across tests.
http://blogs.msdn.com/b/martijnh/archive/2009/12/31/unit-testing-com-object-that-has-been-separated-from-its-underlying-rcw-cannot-be-used.aspx
Note: if you are using the VS2013 to create the coded UI test, you will need to add a test setting file to add this
ExecutionThread.
https://msdn.microsoft.com/en-us/library/ee256991.aspx?f=255&MSPPError=-2147217396
In addition, ad you said that when you playback the browser window that contains an embedded Adobe PDF reader and then it could not work.
I suggest you could try to add more searchproperties to find this target control and then check this issue.
I find a similar thread about your issue, please refer the Steve's code to check your issue.
https://social.msdn.microsoft.com/Forums/vstudio/en-US/73445915-ac08-47de-8bab-b6b07294d0c2/coded-ui-test-wont-find-an-pdf-browser-window-it-times-out?forum=vsunittest
Best Regards,
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