import C# Dll in delphi 10.4

[msi1393 0]

Hello I need to use of C# Dll in my Delphi program

i use of delphi 10.4
is this possible?
 If there is, please explain me step by step

Edited April 26 by msi1393

[David Heffernan 2345]

There are lots of different ways to do this depending on what the dll offers. Nobody can give you any steps without knowing how the dll exposes its functionality. 

[PeterBelow 238]

17 hours ago, msi1393 said:

Hello I need to use of C# Dll in my Delphi program

i use of delphi 10.4
is this possible?
 If there is, please explain me step by step

If the DLL is COM-enabled you can use the Component -> Import component dialog from the IDE main menu:

 

A pure .NET assembly without COM support cannot be used from Delphi with the tools available out of the box, but there are 3rd-party libraries available, some freeware.  A google search for "host the .net framework in delphi" turns up this for example. I have no personal experience with such libraries.

 

[msi1393 0]

Hello
Thank you for your guidance
I did this but it didn't work

[David Heffernan 2345]

10 hours ago, msi1393 said:

I did this but it didn't work

We still don't know anything about your dll. When I said that nobody can give you any step by step guides without knowledge of what the dll is, I stand by that. I mean, we could write you lots of hypotheticals. You've got one above. But how about you put some effort in and find out what this dll offers. 

[eivindbakkestuen 47]

Use C# to create an intermediate DLL that loads the existing DLL, and exports the methods you need on the Delphi side, using types and calling conventions compatible with Delphi.

[msi1393 0]

Hello
And thank you for your guidance
I tried every guide I could find but it didn't work.
Actually, I want to do the following code in Delphi
that I can use a software implemented with #C
I am attaching the text file of the class related to the dll created in C#

Class1.cs

[David Heffernan 2345]

Rather than linking to files, please show the code inline, formatted 

[Die Holländer 45]

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

procedure Encrypt(sr: PAnsiChar; key: PAnsiChar; var encryptedText: PAnsiChar); stdcall; external 'YourDLLName.dll';
procedure Decrypt(sr: PAnsiChar; key: PAnsiChar; var decryptedText: PAnsiChar); stdcall; external 'YourDLLName.dll';

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  inputText, key, encryptedText, decryptedText: PAnsiChar;
begin
  inputText := 'Hello World';
  key := '12345678';

  // Encrypt
  Encrypt(inputText, key, encryptedText);
  ShowMessage('Encrypted Text: ' + encryptedText);

  // Decrypt
  Decrypt(encryptedText, key, decryptedText);
  ShowMessage('Decrypted Text: ' + decryptedText);
end;

end.

 

[JonRobertson 72]

12 hours ago, Die Holländer said:

procedure Encrypt(sr: PAnsiChar; key: PAnsiChar; var encryptedText: PAnsiChar); stdcall; external 'YourDLLName.dll';

procedure Decrypt(sr: PAnsiChar; key: PAnsiChar; var decryptedText: PAnsiChar); stdcall; external 'YourDLLName.dll';

That would work for a DLL that contains native code and uses ANSI char based null-terminated strings.

 

The code posted is C# code, using a .NET System.String class "Representing text as a sequence of UTF-16 code units"

 

The DLL generated will be a .NET assembly containing managed code, not native code. As Peter mentioned earlier, either the DLL has to be written & compiled to support COM interop

https://blogs.embarcadero.com/using-a-net-assembly-via-com-in-delphi/

https://www.blong.com/Conferences/BorCon2004/Interop2/COMNetInterop.htm#CCW

 

or the Delphi application that loads the DLL has to host the CLR before the DLL is loaded.

https://stackoverflow.com/questions/2048540/hosting-clr-in-delphi-with-without-jcl-example

https://stackoverflow.com/questions/258875/hosting-the-net-runtime-in-a-delphi-program

https://en.delphipraxis.net/topic/1744-net-runtime-library-for-delphi/

https://adamjohnston.me/delphi-dotnet-interop-with-jvcl/

 

"Explain step by step" isn't possible, as there are a lot of factors to consider. I suspect this is why there are commercial libraries that do this.

https://www.remobjects.com/hydra/

https://www.crystalnet-tech.com/

https://www.atozed.com/crosstalk/

There was a library called Managed-VCL, which can be found online. But the website vanished a while back.