That means that the module Win32::API is not installed with your Perl. This is unlikely if you are using ActiveState Perl, but if you are using Strawberry Perl, you will have to install Win32::API via CPAN:

cpan Win32::API

[download]

Also, I recommend you read the documentation to Win32::API before modifying the code I posted. The code I posted was not intended for modification - you should have left it as is, and just called the code:

SSC_OPEN( 1, 2400 );

[download]

In reply to Re^5: Perl calling my.DLL for serial port work. by Corion
in thread Perl calling my.DLL for serial port work. by kansaschuck

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