call c# dll or class within c++ project

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I am developing c++ application. Now i want to call a class in c# within the c++ program. is there any way to this? Is it possible to make the c# program as web service and add service reference to the c++ project.

Posted 14-Oct-12 22:21pm

doree007

Updated 6-Feb-20 9:43am

v2

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Member 12139035 15-Nov-15 11:56am

getting error for "ICalculatorPtr" to undeclared udentifier, what is the problem?

runfastman 5-Apr-16 12:30pm

I have the same problem, did you find a solution?

4 solutions

Solution 4

I created a C# ClassLibrary (DLL) that makes SOAP webservice calls. When creating it, make sure you go to your project properties > Build > Output > then make sure to check "Register for COM interop" checkbox.

If you intend to call this C# DLL that makes SOAP calls from a C++ app, you also need to make sure that SecurityProtocol is set properly. For more details, check this post on SO where I explain what problem I had and how I resolved it

C# DLL Calling SOAP Web Service From C++ App - Stack Overflow[^]

Posted 6-Feb-20 9:43am

oniDino

Updated 6-Feb-20 9:44am

v2

Solution 3

Use CLR Hosting APIs
see this:
http://msdn.microsoft.com/en-us/magazine/cc163567.aspx[^]
http://code.msdn.microsoft.com/windowsdesktop/CppHostCLR-e6581ee0[^]

Posted 13-Nov-13 5:11am

indrajit32

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Member 9982800 9-Jul-15 0:49am

not able to access Method from COM library
Wht is the problem

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manoranjan · Accepted Answer · 2012-10-15T20:42:00

Solution 2

No need to make it a web service. Using C++/CLI you can instantiate your C#'s class in your C++ program almost like C++ classes. You need to use gcnew (instead of new) to instantiate .NET classes.

For details, see:
http://en.wikipedia.org/wiki/C%2B%2B/CLI[^]

Posted 15-Oct-12 20:42pm

manoranjan

Comments

doree007 18-Oct-12 4:01am

using this methods is it possible to call a c# windows forms class.

yogeshacharya 22-Aug-13 1:54am

I have a C# dll only and I want to make use the function in C# dll in my C++ application. How can I do this ?

Marius Bancila 18-Oct-12 4:04am

Yes, of course it is.

manoranjan 22-Aug-13 2:58am

Use gcnew to instantiate your C# class in your C++ app and then use it.

E.g.:
MyCsClass ^cso = gcnew MyCsClass;
cso->f1();

Member 15074053 16-Feb-21 13:49pm

in which file we need to add this

Member 15074053 17-Feb-21 2:09am

hii want call a c# method from c++ exe using ^ ,how can we do it

doree007 18-Oct-12 4:11am

how can i make the references for c# application within c++ application. because i am calling a c# windows forms class. I am new to c++ programming. so can u please help me with this.
again thanks for your time

yogeshacharya 22-Aug-13 6:08am

Thanks for the solution

manoranjan 18-Oct-12 5:05am

Create a C++ project that supports CLR (e.g. Windows Forms Application project). You will then be able to add references through the project's 'properties' dialog.

manoranjan 22-Aug-13 9:35am

you are welcome!

Marius Bancila · Accepted Answer · 2012-10-14T23:13:00

It is possible if you use COM. You should make your C# class exposed to COM and then you can use it in C++. Here is an example inspired by a question here:

C#

namespace ManagedDLL
{
   // Interface declaration.
   [Guid("32529FAE-6137-4c62-9945-DE4198FA9D1B")]
   [InterfaceType(ComInterfaceType.InterfaceIsDual)]
   public interface ICalculator
   {
      [DispId(1)]
      int Add(int Number1, int Number2);
   };
}

C#

namespace ManagedDLL
{
   // Interface implementation.
   [Guid("9F2F180D-94A9-47e6-91CC-6BCFABD1DDEB")]
   [ClassInterface(ClassInterfaceType.None)]
   [ProgId("ManagedDLL.ManagedClass")]
   public class ManagedClass : ICalculator
   {
      public int Add(int Number1, int Number2)
      {
         return Number1 + Number2;
      }
   }
}

Then you can use this in C++:

C++

#import "..\bin\ManagedDLL.tlb" raw_interfaces_only
using namespace ManagedDLL;

int _tmain(int argc, _TCHAR* argv[])
{
   // Initialize COM.
   HRESULT hr = CoInitialize(NULL);

   // Create the interface pointer.
   ICalculatorPtr pICalc(__uuidof(ManagedClass));

   long lResult = 0;

   // Call the Add method.
   pICalc->Add(5, 10, &lResult);

   wprintf(L"The result is %d\n", lResult);


   // Uninitialize COM.
   CoUninitialize();

   return 0;
}

call c# dll or class within c++ project

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