How to use a dll encoded in delphi from C# in Visual Studio

Edouard Durand

Hello,

I have a dll coded in delphi language which thus contains functions in delphi which I would like to use in C# under Visual Studio 2017.

I want to use for example the GENERATE function contained in test.dll.

Below is an example of C # code I made to use test.dll in delphi in C#.

But when I test this program, I get the following error:

System.DllNotFoundException: 'Unable to load DLL' test.dll ': The specified module could not be found. (Exception from HRESULT: 0x8007007E) '

How to solve this problem ?

I placed test.dll in the folder that contains the C # source files.

How C# is able to read a dll in delphi if Visual Studio does not know delphi?

Thank you for your help.

2 Replies

Know the answer? Post it — somebody with the same question will find it here.

Rajanikant Hawaldar6y ago
https://www.tek-tips.com/faqs.cfm?fid=7416 https://www.experts-exchange.com/questions/26145460/How-to-use-a-Delphi-DLL-in-C-page.html https://stackoverflow.com/questions/4163364/calling-a-delphi-dll-from-a-c-sharp-net-application
Jignesh Kumar6y ago
Hi,
Please use this link,

For dll import how it search dll:
https://stackoverflow.com/questions/8836093/how-can-i-specify-a-dllimport-path-at-runtime
https://www.codeproject.com/Articles/552348/Csharp-C-Interop-with-DllImport

For Delphi :
https://stackoverflow.com/questions/10852634/using-a-32bit-or-64bit-dll-in-c-sharp-dllimport
https://www.codeproject.com/Questions/1131361/How-to-selectively-load-an-unmanaged-delphi-dll-bi