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tguclu
tguclu

Reputation: 719

How can I call a COM-DLL from C# application?

Hi I have a COM DLL implemented in ATL and now I want to develop a test exe in C# to test the features.

How can I call a COM-DLL from C# application ?

I have tested with LoadLibrary() but AFAIK this is for Win32 native DLL. Also I'm not sure that CoCreateInstance is called somewhere in LoadLibrary()?

[DllImport("kernel32.dll", CharSet = CharSet.Auto)]
  static extern IntPtr LoadLibrary(string lpFileName);

        private int LoadDLL()
        {
            dllPath = lblDllPath.Text;
            int i_hmod = 0;
            IntPtr hMod = LoadLibrary(dllPath);
            i_hmod = hMod.ToInt32();
            if (i_hmod > 0)
            {
                txtOutput.Text += "Dll successfully loaded\r\n";
            }
            else
            {
                txtOutput.Text += "LoadLibrary failed\r\n";
            }
            return i_hmod;
        }

Thnx

Upvotes: 1

Views: 158

Answers (1)

Oded
Oded

Reputation: 498904

You should be able to simply add a reference to the DLL directly to the .NET project - a wrapper will be created and you can call the wrapper methods that will be delegated to the COM component.

Upvotes: 3

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