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Simple MAPI.NET

, 30 Mar 2002
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Usage of the simple MAPI API.

Sample Image - simplemapidotnet.jpg

Abstract

As you know, .NET has SMTP email support built-in. For some special environments, the usage of e.g. the "Simple MAPI' API is prefered.

Details

This API can be called like most other Win32 APIs with 'PInvoke'. By reading the MSDN documentation: Platform SDK - Simple MAPI and some hints from the C++ include header file MAPI.h, we can declare the calls in C# like:

  [DllImport( "MAPI32.DLL", CharSet=CharSet.Ansi)]
  private static extern int MAPIDeleteMail( IntPtr session, IntPtr winhandle,
                                        string id, int flags, int reserved );

For sending email with 'MAPISendMail', the structure 'MapiMessage' has to be filled with pointers to sub-structures like 'MapiRecipDesc'. For this, I used the System.Runtime.InteropServices.Marshal class:

  Marshal.SizeOf(), Marshal.AllocHGlobal(),
  Marshal.StructureToPtr(), Marshal.PtrToStructure(),
  Marshal.DestroyStructure(), Marshal.FreeHGlobal()

Most SimpleMAPI functions are 'wrapped' in a handy class (MapiApi.cs):

public class Mapi
  {
  // Session
  public bool Logon( IntPtr winhandle )
  public void Reset()
  public void Logoff()

  // Sending
  public void AddRecip( string name, string address, bool cc )
  public void Attach( string filepath )
  public bool Send( string subject, string text )

  // Finding
  public bool Next( ref MailEnvelop env )

  // Reading
  public string Read( string id, out MailAttach[] aat )
  public bool Delete( string id )
  public bool SaveAttachm( string id, string filename, string savepath )

  // Addressing
  public bool SingleAddress( string label, out string name, out string addr )
  }

A small (e.g. console) client could do just this few steps:

  Mapi ma = new Mapi();
  ma.Logon( IntPtr.Zero );
  ma.AddRecip( "anybody@anywhere.org", null, false ); 
  ma.Send( "Subject", "Mail text here" );
  ma.Logoff();

Sample App

The source for a sample GUI (Windows Form) client and a console client are included in the download.

Limitations

All code was tested only on Windows XP with MS Outlook XP in the internet-mode. On this system, some security warnings show-up if accessing MAPI. Any feedback for other environments (especially Exchange) are very welcome!

License

This article, along with any associated source code and files, is licensed under A Public Domain dedication

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About the Author

NETMaster
Web Developer
Switzerland Switzerland
No Biography provided

Comments and Discussions

 
GeneralWriting a PST file with non email items without outlook installed Pinmemberuddipto8-Aug-12 0:01 
GeneralMy vote of 5 Pinmembermanoj kumar choubey26-Feb-12 18:23 
QuestionSend Items Pinmemberloende12-Oct-11 8:26 
Question.NET and Microsoft's MAPI DLL are not compatible. PinmemberBMaguire27-Sep-11 15:08 
SuggestionMAPILogon failed with 80004005, BUT: PinmemberPascal Damman19-Jul-11 2:48 
QuestionConsole Application vs. GUI Application PinmemberBart Huls21-Apr-11 4:37 
GeneralMy vote of 5 Pinmemberwaritsar23-Aug-10 0:25 
It's very usuful for me. Thank you very much.
GeneralProblems with Login on Vista with Office 2007 PinmemberDanielEarwicker21-Jul-09 5:44 
GeneralThanks PinmemberNaveenPrabhu22-Feb-09 19:23 
QuestionIs it possible to decrease the time for enabling the allow button on the security warning programmatically PinmemberAmokMe10-Sep-08 2:35 
AnswerRe: Is it possible to decrease the time for enabling the allow button on the security warning programmatically Pinmemberbritish27-Nov-08 9:28 
GeneralAwesome sample Pinmemberjchalfant21-May-08 6:09 
Questionhow to read mail from directly exchange server Pinmemberusha gupta9-Mar-08 20:39 
QuestionIs it possible? [modified] PinmemberMember 41003802-Jan-08 3:17 
Questionread mail which is in folder that is out from indox Pinmemberagjsps29-Oct-07 17:21 
QuestionHow to send HTML page as body Pinmemberabhattad16-Oct-07 20:12 
GeneralProblems setting the messageTypeProperty Pinmemberplanzaplanza16-Oct-07 12:12 
GeneralRe: Problems setting the messageTypeProperty Pinmemberplanzaplanza17-Oct-07 10:43 
GeneralRe: Problems setting the messageTypeProperty PinmemberVraith841-Feb-09 0:11 
QuestionGet only the last received mail from thunderbird Pinmembertomthekid22-May-07 0:18 
Questionwhat about thunderbird Pinmemberaleccc16-May-07 20:35 
GeneralLotus Notes 6.5 client PinmemberAndreyR77722-Feb-07 4:10 
AnswerRe: Lotus Notes 6.5 client PinmemberAaron Browne18-Oct-07 19:46 
GeneralPut message to inbox with MAPI PinmemberArsenmkrt20-Feb-07 2:28 
QuestionOutlook Express MapiDialog causes error Pinmemberdaues2-Feb-07 4:39 

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