How to use IHTMLFramesCollection2 to get elements in each frame?

In a project, I must visit elements value from HTML page, read or write. but there is a message 'error -2147467262 occurred at property node (arg1) in DocumentObjectMode.vi'. take the attached file for example, when I read the length of IHTMLFramesCollection2, the error shows. How it could be?
David Xia
Attachments:
FrameTest.zip ‏15 KB
error 2147467262.JPG ‏15 KB

Try running your code in the User Interface execution subsystem (VI Properties - Execution). That eliminates the error for me (Win XP, LabVIEW 2011).
I'm not certain this is uniquely LabVIEW behavior. Try running a Google search for "ihtmldocument2 frames property invalidcastexception" and you'll see that people using other languages appear to be having the same problem. Several of the threads in those results say they were able to solve it by forcing everything to run in one thread, which is essentially what you're doing by changing to the user interface execution system.
One style note: you should close ALL ActiveX references that you open (the WebBrowser, Document, and IHTMLFramesCollection objects), in the opposite order in which you open them. Also, I find it cleaner to use constants instead of controls for the ActiveX types (such as the type input to Variant to Data).

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