in reply to c style Win32::API interface

You just have a small bug in the prototype you use. The real one is there:

MCIERROR mciSendString(
  LPCTSTR lpszCommand,  
  LPTSTR lpszReturnString,  
  UINT cchReturn,       
  HANDLE hwndCallback   
);

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____
HTH, Dominique
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If the only tool you have is a hammer, you will see every problem as a nail. --Abraham Maslow
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In Section Seekers of Perl Wisdom