Executing *.dll methods from command prompt, print to window?

[i773]

I am writing a unmanaged plugin for Unity3D and I can't keep starting the process to test the code, so I am just looking to execute my tests directly in a command prompt.

Question is I'm using RUNDLL32.EXE to call my entry point but I am unable to print out to the command window with:

OutputDebugString((LPCTSTR)"Test");
cout << "Test" << endl; 

Is there any suggestions on how to print to the window? Also, I did try and attach the process but I am getting 'no symbols loaded' if I could get a suggestion on how to attach properly or the limitations that would be amazing.

Thanks guys!

[Thomas1965]

Did you run the code in Debug mode? OutputDebugString works only in Debug mode

[i773]

Yeah unfortunately it's not displaying anything in the prompt:

Screen shot (from imgbb.com): https://ibb.co/iHbzsv

[Thomas1965]

try this:
OutputDebugString(_T("Hello world")); // #include <tchar.h>

Was the screenshot from the Output window with Show output from Debug?