C# Signature:
/// <summary>
/// The MAPISendMail function sends a message.
///
/// This function differs from the MAPISendDocuments function in that it allows greater
/// flexibility in message generation.
/// </summary>
[DllImport("MAPI32.DLL", CharSet=CharSet.Ansi)]
public static extern uint MAPISendMail(IntPtr lhSession, IntPtr ulUIParam,
MapiMessage lpMessage, uint flFlags, uint ulReserved);
VB Signature:
<DllImport("MAPI32.DLL")> _
Private Shared Function MAPISendMail(ByVal sess As IntPtr, ByVal hwnd As IntPtr, ByVal message As MapiMessage,
ByVal flg As Integer, ByVal rsv As Integer) As Integer
End Function
User-Defined Structures:
User-Defined Constants:
Notes:
This signature is valid, if the MapiMessage is defined as a class. If MapiMessage is defined as a structure a 'ref' has to be added before 'MapiMessage lpMessage' parameter
Tips & Tricks:
Watch it! MAPI32 is not supported from managed code [http://blogs.msdn.com/mstehle/archive/2007/10/03/fyi-why-are-mapi-and-cdo-1-21-not-supported-in-managed-net-code.aspx]
Please add some!
Sample Code:
[DllImport("MAPI32.DLL")]
static extern int MAPISendMail(IntPtr sess, IntPtr hwnd, MapiMessage message, int flg, int rsv);
public int SendMail(string fileName)
{
MapiMessage msg = new MapiMessage();
msg.subject = "Hello World!";
msg.noteText = "See attached file for details";
msg.files = GetAttachments(fileName, out msg.fileCount);
int result = MAPISendMail(new IntPtr(0), new IntPtr(0), msg, 0x00000001 | 0x00000008, 0);
if (result > 1 || result < 0)
throw new System.InvalidOperationException();
return result;
}
IntPtr GetAttachments(string fileName, out int fileCount)
{
int size = Marshal.SizeOf(typeof(MapiFileDesc));
IntPtr intPtr = Marshal.AllocHGlobal(size);
MapiFileDesc mapiFileDesc = new MapiFileDesc();
//An integer used to indicate where in the message text to render the attachment.
mapiFileDesc.position = -1;
int ptr = (int)intPtr;
mapiFileDesc.name = Path.GetFileName(fileName);
mapiFileDesc.path = fileName;
Marshal.StructureToPtr(mapiFileDesc, (IntPtr)ptr, false);
ptr += size;
fileCount = 1;
return intPtr;
}
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public class MapiMessage
{
public int reserved;
public string subject;
public string noteText;
public string messageType;
public string dateReceived;
public string conversationID;
public int flags;
public IntPtr originator;
public int recipCount;
public IntPtr recips;
public int fileCount;
public IntPtr files;
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public class MapiFileDesc
{
public int reserved;
public int flags;
public int position;
public string path;
public string name;
public IntPtr type;
}
Alternative Managed API:
Do you know one? Please contribute it!
