The following code example shows how to use the DllImportAttribute attribute to import the Win32 MessageBox function. The code example then calls the imported method.
C#
using System;
using System.Runtime.InteropServices;
class Example
{
// Use DllImport to import the Win32 MessageBox function.
[DllImport("user32.dll", CharSet = CharSet.Unicode)]
public static extern int MessageBox(IntPtr hWnd, String text, String caption, uint type);
static void Main()
{
// Call the MessageBox function using platform invoke.
MessageBox(new IntPtr(0), "Hello World!", "Hello Dialog", 0);
}
}
VB.NET
Imports System
Imports System.Runtime.InteropServices
Module Example
' Use DllImport to import the Win32 MessageBox function.
"user32.dll"
, CharSet:=CharSet.
Unicode)> _
Function MessageBox(
ByVal hwnd
As IntPtr,
ByVal t
As String,
ByVal caption
As String,
ByVal t2
As UInt32)
As Integer End Function Sub Main()
' Call the MessageBox function using platform invoke. MessageBox(
New IntPtr(0),
"Hello World!",
"Hello Dialog", 0)
End Sub End ModuleSource : msdn
url :http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.dllimportattribute.aspx
