Fastest way to access VB6 String in C#

Posted by Simon Woods on Stack Overflow See other posts from Stack Overflow or by Simon Woods
Published on 2010-03-30T06:04:38Z Indexed on 2010/03/30 6:13 UTC
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Filed under:

com-interop

|

string

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marshalling

Hi

I am using COMInterop. I have a call in VB6 which returns a string of roughly 13000 chars. If I execute the call in pure VB6 it takes about 800ms to execute. If I execute it via c# and COMInterop it takes about 8 seconds. I'm assuming the delay is caused by marshalling.

If I am correct about marshalling, I'd be grateful if someone could suggest the fastest way I can get this into C#. e.g. Would it be better to a) expose it as a byte array b) provide a byref string param into the VB6 layer

I would appreciate some sample code as well. I tried the

Marshal.PtrToStringAuto(Marshal.ReadIntPtr(myCOMObject.GetString, 0)

to no avail

Many thx

S

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