External DLL not recognized. 1

[marcello62]

Hello,

I have written a very simple dll in Delphi, it only contains one procedure which generates a message. I have done this for test-purposes, because I want to call the .dll from C#. I registered the .dll with regsvr32, and I try to set a reference to it in C#. However, I get the error message: 'a reference to Testdllproject.dll could not be added. Please make sure that the file is accessible, and that it's a valid assembly or .COM component.' However, I can use the DLL without any problem from another Delphi application and I have registered it without any problems. So why can't I set a reference?

Any help will be greatly appreciated.

Thanks.

 

[monkhandle]

You can't reference native binaries like that in .net.
You can use pinvoke calls to call your function in native dll.
Search msdn or google for pinvoke example...

 

[marcello62]

Hi Monkhandle,

I wrote a class which invokes the .dll and it works. Thanks!