how to call function in c# which is written in c++ dll

Question

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I have to call

C++

unsigned long  AvailableCameras (int nFGHandle,enum eCameraIDs *pCamera, unsigned long &nSize)

in c#
my code is

C#

public delegate ulong AvailableCameras_Delegate(int nFGHandle,ref eCameraIDs pCamera,ref ulong nSize);
  [DllImport("abc.dll", CallingConvention = CallingConvention.StdCall, EntryPoint = "AvailableCameras")]
        public static extern ulong  AvailableCameras (int nFGHandle, ref eCameraIDs pCamera, ref ulong nSize);

And calling is

C#

AvailableCameras_Delegate cam = new AvailableCameras_Delegate(Importdll_DermalogVC3.AvailableCameras);
             ulong abcd = cam(a, ref eFrameInfoIDs.E_LIFENESS_INFO,ref vx);

it gives error

SQL

1.Delegate 'DermalogProject.AvailableCameras_Delegate' has some invalid argument
2.cannot convert from 'DermalogProject.eFrameInfoIDs' to 'ref DermalogProject.eCameraIDs'
3.Argument '3' must be passed with the 'ref' keyword

Posted 7-Aug-12 23:26pm

Member 7909353

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Comments

Sangramsingh Pawar 8-Aug-12 6:27am

It gives conversion error
check that argument you passed to function

2 solutions

Solution 1

Go through following links it will help you
http://www.deitel.com/books/NET/AddingReferences.pdf[^]

http://msdn.microsoft.com/en-us/library/wkze6zky(v=vs.80).aspx[^]

Posted 7-Aug-12 23:45pm

Sangramsingh Pawar

Comments

Member 7909353 8-Aug-12 6:07am

Thanks!But I want to call using dllimport.

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Member 7909353 · Accepted Answer · 2012-08-16T01:28:00

Solution 2

C#

AvailableCameras_Delegate cam = new AvailableCameras_Delegate(Importdll_DermalogVC3.AvailableCameras);

cam(nHandle, ref eCameraIDs.INTERN_CAMERA, ref vx);

Posted 16-Aug-12 1:28am

Member 7909353