Mixed Language Programming between Digital Fortran and Visual Basic

[NavyBoy]

I successfully created a dll in Digital Fortran which I can use from Visual
Basic. This DLL processes binary data. While processing a file, I would like
to add a progress bar in Visual Basic. The problem is that there is no
communation (values of variables) between the DLL and VB while the
processing is taking place. All variable communications take place after the
processing is done. I want to use the position of the file as the metric for
the progress bar. i.e. when the position is set at the beginning of the file
represents 0%, and at the end of the file is 100%. The formula is simple:
100 * CurrentFilePos / FileSize. The problem is to communicate this result
back to VB while the processing is taking place. Any ideas?

Thanks,

NavyBoy
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