Call COM/COM+ in Delphi.net

Author：Eve Cole Update Time：2025-03-19 20:16:01

The customer's system is a combination of C/S and B/S. The B/S part was originally planned to use IntraWeb.

Delphi.net happened to appear, so the B/S part was switched to Delphi.net;

A problem arose during the development process: the encryption algorithm was developed by Delphi 7.

Time was too tight and it was impossible to rewrite the encryption algorithm using Delphi.net, so I thought of COM/COM+,

It's a pity that there is very little information on Delphi.net, and even less information on interoperability with COM/COM+.

So I explored it myself and came up with the following (source code attached):

1. Create COM/COM+ in Delphi 7

(1) In the IDE, File -> New -> Other -> ActiveX -> ActiveX Library,

Save the project file as CompRoject;

(2) In the IDE, File -> New -> Other -> ActiveX -> COM Object,

Fill in Test in the Class Name column and save the unit as Test;

(3) Add a process named GetMsg to ITest in View -> Type Library in the IDE;

(4)Ctrl + F9;

(5) Run -> Register ActiveX Server in the IDE; // Registering COM/COM+ can also be done using the command line

2. Call COM/COM+ in Delphi.net

(1) In the IDE, File -> New -> asp.net Web application,

You may encounter a lot of troubles that you have to deal with yourself!

(2) Add a reference to COM/COM+:

In the IDE Project ->Add Reference -> COM Imports,

Select the ComProject you just registered and click Add Reference to add a reference.

Click OK (Pay attention to your project file (ASP.NET Web Application)

The path (Path) cannot use Chinese);

(3) Add ComProject to uses in WebForm1;

(4) Call COM/COM+

Put two Web Controls above WebForm1: a Button and a Label;

Double-click the Button and write in the process:

var

Msg: string;

Obj: TObject;

begin

Obj := Server.CreateObject('ComProject.Test'); // Create COM/COM+

Test(Obj).GetMsg(Msg); // Convert Obj to Test and call the GetMsg method;

Label1.Text := Msg;

end;

(5) Add Aspcompat="true" to the Page line of WebForm1.aspx,

For example: <%@ Page language="c#" Debug="true" Codebehind="WebForm1.pas" AutoEventWireup="false" Inherits="WebForm1.TWebForm1" Aspcompat="true"%>

(6)Ctrl + F9,Run ->Run (or Run Without Debugging);

(7) Click the Button on the web page, is it done?

//The following is the source code part:

COM/COM+ project file (ComProject.dpr):

library ComProject;

uses

ComServ,

ComProject_TLB in 'ComProject_TLB.pas',

Test in 'Test.pas' {Test: CoClass};

exports

DllGetClassObject,

DllCanUnloadNow,

DllRegisterServer,

DllUnregisterServer;

{$R *.TLB}

{$R *.RES}

begin

end.

//COM/COM+ Test unit (Test.pas):

unit Test;

{$WARN SYMBOL_PLATFORM OFF}

interface

uses

Windows, ActiveX, Classes, ComObj, ComProject_TLB, StdVcl;

type

TTest = class(TTypedComObject, ITest)

protected

function GetMsg(out Msg: WideString): HResult; stdcall;

{Declare ITest methods here}

end;

implementation

uses ComServ;

function TTest.GetMsg(out Msg: WideString): HResult;

begin

Msg := 'Com/Com+ test successful!';

end;

initialization

TTypedComObjectFactory.Create(ComServer, TTest, Class_Test,

ciMultiInstance, tmApartment);

end.

//COM/COM+ type library t unit (ComProject_TLB.pas):

unit ComProject_TLB;

//************************************************ ********************** //

// WARNING

// -------

// The types declared in this file were generated from data read from a

// Type Library. If this type library is explicitly or indirectly (via

// another type library referring to this type library) re-imported, or the

// 'Refresh' command of the Type Library Editor activated while editing the

// Type Library, the contents of this file will be regenerated and all

// manual modifications will be lost.

//************************************************ ********************** //

// PASTLWTR: 1.2

// File generated on 2004-2-6 13:28:46 from Type Library described below.

//************************************************ ********************** //

// Type Lib: D:/Program Files/Borland/Delphi7/Projects/comtest2/ComProject.tlb (1)

// LIBID: {92B46A1D-8A31-46C5-98FE-C03FEA98DC21}

//LCID: 0

// Helpfile:

// HelpString: ComProject Library

//DepndLst:

// (1) v2.0 stdole, (D:/WINDOWS/system32/stdole2.tlb)

//************************************************ ********************** //

{$TYPEDADDRESS OFF} // Unit must be compiled without type-checked pointers.

{$WARN SYMBOL_PLATFORM OFF}

{$WRITEABLECONST ON}

{$VARPROPSETTER ON}

interface

uses Windows, ActiveX, Classes, Graphics, StdVCL, Variants;

//************************************************ *********************//

// GUIDS declared in the TypeLibrary. Following prefixes are used:

// Type Libraries: LIBID_xxxx

// CoClasses : CLASS_xxxx

// DISPInterfaces : DIID_xxxx

// Non-DISP interfaces: IID_xxxx

//************************************************ *********************//

const

// TypeLibrary Major and minor versions

ComProjectMajorVersion = 1;

ComProjectMinorVersion = 0;

LIBID_ComProject: TGUID = '{92B46A1D-8A31-46C5-98FE-C03FEA98DC21}';

IID_ITest: TGUID = '{96CECA70-1438-4C54-982E-67C378F085E8}';

CLASS_Test: TGUID = '{CA54722F-C5EF-4814-A8DB-C1C357832F08}';

type

//************************************************ *********************//

// Forward declaration of types defined in TypeLibrary

//************************************************ *********************//

ITest = interface;

//************************************************ *********************//

// Declaration of CoClasses defined in Type Library

// (NOTE: Here we map each CoClass to its Default Interface)

//************************************************ *********************//

Test = ITest;

//************************************************ *********************//

//Interface: ITest

// Flags: (256) OleAutomation

// GUID: {96CECA70-1438-4C54-982E-67C378F085E8}

//************************************************ *********************//

ITest = interface(IUnknown)

['{96CECA70-1438-4C54-982E-67C378F085E8}']

function GetMsg(out Msg: WideString): HResult; stdcall;

end;

//************************************************ *********************//

// The Class CoTest provides a Create and CreateRemote method to

// create instances of the default interface ITest exposed by

// the CoClass Test. The functions are intended to be used by

// clients wishing to automate the CoClass objects exposed by the

// server of this typelibrary.

//************************************************ *********************//

CoTest = class

class function Create: ITest;

class function CreateRemote(const MachineName: string): ITest;

end;

implementation

usesComObj;

class function CoTest.Create: ITest;

begin

Result := CreateComObject(CLASS_Test) as ITest;

end;

class function CoTest.CreateRemote(const MachineName: string): ITest;

begin

Result := CreateRemoteComObject(MachineName, CLASS_Test) as ITest;

end;

end.

///////////////////////////////////////The following is the source code for calling COM/COM+ from Delphi.net/// ////////////////////////////

//WebForm1.pas unit:

unit WebForm1;

interface

uses

System.Collections, System.ComponentModel,

System.Data, System.Drawing, System.Web, System.Web.sessionState,

System.Web.UI, System.Web.UI.WebControls, System.Web.UI.HtmlControls,

ComProject;

type

TWebForm1 = class(System.Web.UI.Page)

{$REGION 'Designer Managed Code'}

strict private

procedureInitializeComponent;

procedure Button1_Click(sender: System.Object; e: System.EventArgs);

{$ENDREGION}

strict private

procedure Page_Load(sender: System.Object; e: System.EventArgs);

strictly protected

Button1: System.Web.UI.WebControls.Button;

Label1: System.Web.UI.WebControls.Label;

procedure OnInit(e: EventArgs); override;

private

{Private Declarations}

public

{Public Declarations}

end;

implementation

{$REGION 'Designer Managed Code'}

/// <summary>

/// Required method for Designer support -- do not modify

/// the contents of this method with the code editor.

/// </summary>

procedure TWebForm1.InitializeComponent;

begin

Include(Self.Button1.Click, Self.Button1_Click);

Include(Self.Load, Self.Page_Load);

end;

{$ENDREGION}

procedure TWebForm1.Page_Load(sender: System.Object; e: System.EventArgs);

begin

// TODO: Put user code to initialize the page here

end;

procedure TWebForm1.OnInit(e: EventArgs);

begin

// Required for Designer support

InitializeComponent;

inheritedOnInit(e);

end;

procedure TWebForm1.Button1_Click(sender: System.Object; e: System.EventArgs);

var

Msg: string;

Obj: TObject;

begin

Obj := Server.CreateObject('ComProject.Test');

Test(Obj).GetMsg(Msg);

Label1.Text := Msg;

end;

end.

///WebForm1.aspx unit:

<%@ Page language="c#" Debug="true" Codebehind="WebForm1.pas" AutoEventWireup="false" Inherits="WebForm1.TWebForm1" Aspcompat="true"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<html>

<head>

</head>

<asp:button id=Button1

style="Z-INDEX: 1; LEFT: 238px; POSITION: absolute; TOP: 158px"

runat="server" text="Button">

</asp:button>

<asp:label id=Label1

style="Z-INDEX: 2; LEFT: 190px; POSITION: absolute; TOP: 54px"

runat="server">Label</asp:label>

</form>

</body>

</html>