How return array(double[]) from com object in C#?

Question

I return COM object in C# from C++ COM library. The object has a property that returns the type C# - "object". The documentation indicated that its type is a "Variant"(in C++) and contains one-dimensional array of three "double" values. After making the cast,

Object obj = m.TextPosition;  // "m" - is com object
var d3 = (System.Double[])obj;// cast

I get the error: "Unable to cast object of type 'System.Double[*]' to type 'System.Double[]'.

How to solve this problem?

Hans Passant · Accepted Answer · 2012-06-17 20:33:05Z

1

You need to create a SAFEARRAY with a lower bound of 0 to be compatible with a .NET double[].

If that's not an option then you need to cast to Array in your C# code and use its GetValue() method to access the elements. Use GetLowerBound() to know where to start.

answered Jun 17, 2012 at 20:33

Hans Passant

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3 Comments

Максим Ширяев Over a year ago

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Максим Ширяев Over a year ago

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Максим Ширяев Over a year ago

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