Get address of a method from Dll : DllImport « Windows « C# / CSharp Tutorial

Home
C# / CSharp Tutorial
1.Language Basics
2.Data Type
3.Operator
4.Statement
5.String
6.struct
7.Class
8.Operator Overload
9.delegate
10.Attribute
11.Data Structure
12.Assembly
13.Date Time
14.Development
15.File Directory Stream
16.Preprocessing Directives
17.Regular Expression
18.Generic
19.Reflection
20.Thread
21.I18N Internationalization
22.LINQ
23.GUI Windows Forms
24.Windows Presentation Foundation
25.Windows Communication Foundation
26.Workflow
27.2D
28.Design Patterns
29.Windows
30.XML
31.XML LINQ
32.ADO.Net
33.Network
34.Directory Services
35.Security
36.unsafe
C# / C Sharp
C# / C Sharp by API
C# / CSharp Open Source
C# / CSharp Tutorial » Windows » DllImport 
29.12.4.Get address of a method from Dll
using System;
using System.Threading;
using System.Runtime.InteropServices;
using System.Collections.Generic;
using System.Text;
    class Program
    {
        [DllImport("kernel32.dll")]
        static extern IntPtr LoadLibrary(string dllName);

        [DllImport("kernel32.dll")]
        static extern IntPtr GetProcAddress(IntPtr hModule, string procName);

        delegate int MessageBoxDelegate(IntPtr hwnd,
            [MarshalAs(UnmanagedType.LPWStr)]string text,
            [MarshalAs(UnmanagedType.LPWStr)]string caption,
            int type);

        static void Main(string[] args)
        {
            IntPtr userApi = LoadLibrary("user32.dll");
            IntPtr msgBoxAddress = GetProcAddress(userApi, "MessageBoxW")// unicode (wide) message box
            MessageBoxDelegate mbd = (MessageBoxDelegate)Marshal.GetDelegateForFunctionPointer(msgBoxAddress,typeof(MessageBoxDelegate));
            mbd(IntPtr.Zero, "A""B"0);

            DoSomething(mbd);
        }

        static void DoSomething(MessageBoxDelegate mbd)
        {
            mbd(IntPtr.Zero, "Work completed.""Work Progress"0);
        }
    }
29.12.DllImport
29.12.1.DllImport: load dll library
29.12.2.DllImport
29.12.3.External Method
29.12.4.Get address of a method from Dll
29.12.5.API File reader
www.java2java.com | Contact Us
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.