I'm facing a very strange problem during last week. I need to call some functions using Call library function node.I have done many times in the past and I'm quite sure to call the function in the right way but I need help.Synthetically I have to call in order the following functions:DVRInitLibraryDVRGetLibraryVersionDVROpenConnection2DVRConnectSite...DVRDisconnectSiteDVRCloseConnectionThe first three functions works fine (I have the same result using it under Visual Studio!!). The function that I'm not able to call correctly is the following:DVRRESULT WINAPI DVRConnectSite( DVRHANDLE Handle, LPCSTR SiteIP, INT SitePort, LPCSTR UserID, LPCSTR Password, INT AReadTimeOut)The function return a generic error code that doesn't give any useful information. Attached there is an image showing the way I'm calling the function. I did a lot of trials but I'm not able to understand the problem (under Visual Studio on the same machine It works!!). Same result on LabVIEW 7.1.1 or 8.6.1 or 2009 under Windows XP.RegardsGolzioMessage Edited by Golziante on 05-17-2010 03:42 AM

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Thank you Rolfk, now It works!!!

Attached there is a small VI showing how to allocate, initialize and deallocate an array using Marshal Class.

Bye

Golzio

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