如何在用C ++ DLL编写的C#中调用函数 [英] how to call function in c# which is written in c++ dll

问题描述

我必须打电话给

I have to call

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

我的代码是

in c#
my code is

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); 

打电话是

And calling is

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

它给出了错误

it gives error

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

推荐答案

通过以下链接将为您提供帮助
http://www.deitel.com/books/NET/AddingReferences.pdf [ ^ ]

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

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[^]

AvailableCameras_Delegate cam = new AvailableCameras_Delegate(Importdll_DermalogVC3.AvailableCameras);

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

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