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.NET Forum / Languages / C# / October 2007Need an IStream object for COM, help please!
Hi all, I'm trying to call a COM function from C# The function gets a paramter of type IStream in C++. I've found the type System.Runtime.InteropServices.ComTypes.IStream, however I'm not sure how to create an instance of it to pass as the parameter. Anyone can tell me what to do? i dont know what to pass in as the parameter, because I'm not sure how to create an instance of the "IStream" object in C# Kourosh, In COM, IStream is not an object, but an interface. You have to implement that interface on a class, and pass that implementation to the method to be acted upon.  Signature- Nicholas Paldino [.NET/C# MVP] - mvp@spam.guard.caspershouse.com > Hi all, > I'm trying to call a COM function from C# [quoted text clipped - 4 lines] > because I'm not sure how to create an instance of the "IStream" object > in C# oh yea oops :D so there is no easy way in C# to perhaps use the Stream class, or any built in COM object from .NET for this purpose? > Kourosh, > [quoted text clipped - 16 lines] > > - Show quoted text - You could create a wrapper which maps the IStream implementation to the methods on Stream (there isn't a one-to-one correspondence between the methods on IStream and Stream, but it shouldn't be hard). However, it depends on what you are trying to feed the method. What is it that you have the data in which you want the method to access through the IStream? Signature- Nicholas Paldino [.NET/C# MVP] - mvp@spam.guard.caspershouse.com > oh yea oops :D > so there is no easy way in C# to perhaps use the Stream class, or any [quoted text clipped - 20 lines] >> >> - Show quoted text - Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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