User defined input parameters in DLL file

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I have a c++ project with a method

C++

int recvPDU(mmslib::MMSpdu_PDU* pdu, mmslib::mms_Control* ctl);

which has user defined input parameters.

I wish to use this method in a c# project by creating a dll of the method recvPDU. I have successfully created the dll. But I cannot understand how to use the dllimport.

What I have tried:

The C# code is as:

C#

[DllImport(@"C:\\Riddhi_GIT\\IEC 61850 Lib\\Debug\\Prototype_IECServer.dll")]
       
 private static extern int recvPDU(... pdu, ... ctl);

The path to the dll is right. But I need help to put the datatype instead of ... in the dllimport.

Posted 7-Jan-18 23:42pm

Member 13612015

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Richard MacCutchan 8-Jan-18 7:02am

Since both parameters are pointers you can use the IntPtr type. You will also need to create a structure mapping for each parameter: StructLayoutAttribute Class (System.Runtime.InteropServices)[^].

Member 13612015 12-Jan-18 7:28am

Thank you for your reply. I am new to c++. I have never worked on it. Plus the code I am using is written by someone else. I dont know how to create structure mapping. Can you show me an example?

Richard MacCutchan 12-Jan-18 9:07am

The example is in the link I provided above.

Member 13612015 12-Jan-18 9:22am

Ya. I understood it later. Thanks a lot

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