.Net 5.0 - Method not found "System.Object.System.Runtime.InteropService.Marshal.GetActiveObject(Stem.String)

Question

Hi
While working with .Net 4.8, the following code works as expected:

var tcObject = Marshal.GetActiveObject(toolFullName);  
```But after moving my project to .Net 5.0, I'm getting the following error meager:    
"Method not found "System.Object.System.Runtime.InteropService.Marshal.GetActiveObject(Stem.String)"    
    
Am I missing any reference to my project? Or I should use different code in order to make it works in .Net 5.0?     
    
    
Can you please assist?    
    
Best Regards,  
Nadeem Bader   

Answer 1

Hi @Nadeem Bader ,
According to the document Marshal.GetActiveObject(String) Method, it only applies to .Net Framework.
To use it in .Net 5, you can check the following link.
https://github.com/dotnet/runtime/issues/37617
Best Regards.
Jiachen Li

----------

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Answer 2

In .Net 5 and 6 the GetActiveObject method was removed from the Marshal class in the System.Runtime.InteropServices namespace.

You can use p/invoke with the Windows API GetActiveObject function to retrieve an interface pointer for an object from the running object table.

Answer 3

HI
Thank you for your replies.
I'm using c# code. Can you please show me how to do that in code?
Best Regards,
Nadeem Bader

Answer 4

Using .Net 5 -

   [DllImport("Oleaut32.dll", CallingConvention = CallingConvention.StdCall, PreserveSig = true)] static extern int GetActiveObject(ref Guid clsid, IntPtr reserved, out IntPtr punk);  

ITestObject is a COM interface obtained from the running object table -

   Guid clsid = new Guid("FBD3B83F-DAC1-431E-9C22-42C3F593620D");  
      IntPtr unk;  
     
     var hr = GetActiveObject(ref clsid, IntPtr.Zero, out unk);  
     
      if (hr == 0)  
      {  
            ITestObject iFace = (ITestObject)Marshal.GetObjectForIUnknown(unk);  
            //Rest of Code  
      }