I am writing a C# program that makes use of MAPI. I know I should use a different language for this, but I was told to use .NET. The application will be used to send emails under an account different from the logged in user. I have the application running,
but I am having a couple of problems logging in.
I can log in just fine using the current user account, but when I try to log in to a dedicated account, the mail is still sent from the current user account. My login code follows:
private bool Logon()
{
if (String.IsNullOrEmpty(username) || String.IsNullOrEmpty(password))
{
error = MAPILogon(WinHandle, null, null, 0, 0, ref session);
Logging.Log("Logged in using credentials for the current user.");
}
else
error = MAPILogon(WinHandle, username, password, 0, 0, ref session);
if (error != 0)
error = MAPILogon(WinHandle, null, null, MapiLogonUI, 0, ref session);
return error == 0;
}
[DllImport("MAPI32.DLL", CharSet = CharSet.Ansi)]
private static extern int MAPILogon(IntPtr hwnd, string profileName, string password,
int flag, int rsv, ref IntPtr session);
[DllImport("MAPI32.DLL")]
private static extern int MAPISendMail(IntPtr session, IntPtr hwnd, MapiMessage message, int flag, int rsv);
I have added a null terminator to the username and password ("\0") so it seems like I should be able to log in as a different user.
I tried closing my Outlook and running the application and it said that it sent the message correctly, but froze on closing. Outlook would no longer open, and eventually I rebooted my computer. Does Outlook have to be open to use MAPI controls?
I have read that the login is for a profile name rather than a username. Is this a Windows Profile? My understanding is that Exchange uses accounts.
Finally, when the message is sent from the default profile, I get a confirmation that "A program is trying to send an e-mail message on your behalf." Since this app may be sending several messages a day, I don't want the user to have to keep pressing Allow.
Is there a way to suppress this message programatically or as an Outlook or Exchange Server configuration?
My dev environment is Windows 7 and Outlook 2010, but this needs to work in all environments. As you can see above, I am using simple MAPI. I've done some testing with Extended MAPI, but keep getting a message saying that there is no default mail client.
I appreciate any insights people may have.
C# MAPI Issues
