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OPC-HDA Connectivity Problem

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hi all

I want to connect to my OPC-HDA server (Matrikon is installed), i have followed the guide lines available in help files, i did not get any issue in connectivity and i manged to connect it successfully but when i call a method "CreateBrowse" of OPC-HDA server, it returns null, i am using the following code:

OPCHDABrowser Browser;

int[] errors;

OpcSrv.CreateBrowse(null, out Browser, out errors);

after this method "Browser" object contains null.

i would appreciate if someone can help me.

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