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Parameters for COM/Excel Chart.Export in C++

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Hi everyone!

Please before anyone responds "Just use C# or C++/CLI,"  please bear in mind that .Net managed assemblies are not an option.  The project I am working on requires that .NET *not* be used.  

I am having some trouble ascertaining the proper parameters for Chart.Export: https://msdn.microsoft.com/en-us/library/Microsoft.Office.Tools.Excel.Chart.Export(v=vs.100).aspx

I know they are variants, but "Variant" is actually a struct containing several data types.  I am having trouble figuring out what kind of data type is being used for the function.  Every attempt so far as resulted in exceptions.  I normally would deal with this without asking for help, but I am becoming extremely frustrated with it.  The documentation from Microsoft is of no help whatsoever.

Any suggestions would be greatly appreciated.

Thank you!  =)


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