My example was not clear. I did try using $wParam as the buffer size as that is what was returned by the message hook from Win32::GUI. That still caused the system to hang on the second pass. It was not until I created the reference to wParam that it worked.

In reply to Re^2: Win32::API passing a parameter by reference issue by rpnoble419
in thread Win32::API passing a parameter by reference issue by rpnoble419

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