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C# calling a DLL API, in this case, MessageBox in user32.dll

/ Published in: C#
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[1] Add 'using System.Runtime.InteropServices;'
[2] Add DllImport and function declaration
[3] call function.

This example involves passing strings and passing IntPtr.

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  1. using System;
  2. using System.Runtime.InteropServices;
  3.  
  4. class Example
  5. {
  6.     // Use DllImport to import the Win32 MessageBox function.
  7.     [DllImport("user32.dll", CharSet = CharSet.Unicode)]
  8.     public static extern int MessageBox(IntPtr hWnd, String text, String caption, uint type);
  9.  
  10.     static void Main()
  11.     {
  12.         // Call the MessageBox function using platform invoke.
  13.         MessageBox(new IntPtr(0), "Hello World!", "Hello Dialog", 0);
  14.     }
  15. }

URL: http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.dllimportattribute.aspx

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