How to get an email item programatically selected by user in outlook using C++/COM

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I created a project for addins using following link.
https://msdn.microsoft.com/en-us/library/office/ee941475%28v=office.14%29.aspx?f=255&MSPPError=-2147217396#BuildingNativeAddinforOL2010_CreatingaNativeAddin

My requirement is to get the emails selected by user on click of a button from addins tab and send that input to another dll. And i already created a addins tab and buttons in outlook using above shared link. Ours is a document storage management so users can be able to save the data from the outlook/word/excel.

Thanks,
Vijay

What I have tried:

I am new to the com interfaces, so i followed same that was shared in above link.

Posted 7-Feb-17 22:21pm

Vijay533

Updated 9-Feb-17 0:09am

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Anderson Rissardi · Answer 1 · 2017-02-09T00:09:00

I have a little experience in add-ins with c#, but I believe that you will understand the concept.
I believe that you should use Microsoft.Office.Interop classes with COM to create it.

To find the current selected Microsoft.Office.Interop.Outlook.MailItem you can use this:

C#

Outlook.MailItem Email = null;
Outlook.Inspector actInspector = Outlook.Application.ActiveInspector();
if (actInspector == null)
{
    Outlook.Explorer explorer = Outlook.Application.ActiveExplorer();

    try
    {
        Email = explorer.GetType().InvokeMember("ActiveInlineResponse", System.Reflection.BindingFlags.GetProperty | System.Reflection.BindingFlags.Instance |
                System.Reflection.BindingFlags.Public, null, explorer, null) as Outlook.MailItem;
    }
    finally
    {
        Marshal.ReleaseComObject(explorer);
    }
}
else
{
    try
    {
        Email = actInspector.CurrentItem as Outlook.MailItem;
    }
    finally
    {
        if (actInspector != null) Marshal.ReleaseComObject(actInspector);
    }
}

this came from
http://stackoverflow.com/questions/40973773/how-to-reliably-know-what-object-is-current-in-focus-outlook-window-i-e-an-e/40979666#40979666

To get all MailItem selectes in explorer you can use this:

C#

Outlook.Explorer explorer = null;
Outlook.Selection selection = null;

try
{
    explorer = Global.OutlookApp.ActiveExplorer();
    selection = explorer.Selection;

    //selection.Count;  --Example
    foreach (MailItem item in selection)
    {
        //item.Subject -- Example
    }
}
finally
{
    if (selection != null)
       Marshal.ReleaseCOMObject(selection);

    if (explorer != null)
       Marshal.ReleaseCOMObject(explorer);
}