Reading .msg/.eml attachment using simple MAPI(MAPI32)

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Hi,

I'm facing problem while reading email attachment as .msg or .eml extension, it does not save on disk or also show null while seeing in attachment[] in debug mode. can you please help/resolve the issue or advise alternate.

    private void GetAttachNames( out MailAttach[] aat )
{
aat = new MailAttach[ lastMsg.fileCount ];
Type fdtype = typeof(MapiFileDesc);
int fdsize = Marshal.SizeOf( fdtype );
MapiFileDesc fdtmp = new MapiFileDesc();
int runptr = (int) lastMsg.files;
for( int i = 0; i < lastMsg.fileCount; i++ )
    {
    Marshal.PtrToStructure( (IntPtr) runptr, fdtmp );
    runptr += fdsize;
    aat[i] = new MailAttach();
    if( fdtmp.flags == 0 )
        {
        aat[i].position = fdtmp.position;
        aat[i].name     = fdtmp.name;
        aat[i].path     = fdtmp.path;
        }
    }
}

[edit]Code added from OP comment - OriginalGriff[/edit]

Posted 15-Mar-11 18:04pm

nilesh_lohani

Updated 15-Mar-11 23:08pm

OriginalGriff

v3

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OriginalGriff 16-Mar-11 3:34am

Without seeing the code you are using, it is impossible to tell what is happening.
Please edit you question, and provide relevant code fragments.

nilesh_lohani 16-Mar-11 3:42am

Below code here
---------------
private void GetAttachNames( out MailAttach[] aat )
{
aat = new MailAttach[ lastMsg.fileCount ];
Type fdtype = typeof(MapiFileDesc);
int fdsize = Marshal.SizeOf( fdtype );
MapiFileDesc fdtmp = new MapiFileDesc();
int runptr = (int) lastMsg.files;
for( int i = 0; i < lastMsg.fileCount; i++ )
{
Marshal.PtrToStructure( (IntPtr) runptr, fdtmp );
runptr += fdsize;
aat[i] = new MailAttach();
if( fdtmp.flags == 0 )
{
aat[i].position = fdtmp.position;
aat[i].name = fdtmp.name;
aat[i].path = fdtmp.path;
}
}
}

when attachment is .msg or .eml then fdtmp.name contains null.

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OriginalGriff · Answer 1 · 2011-03-15T23:18:00

Sorry, but that code doesn't make a whole lot of sense.
"fdtmp" is never pointed at anywhere useful - just at a new MapiFileDesc object, then left there.
I see no code here that actually goes through a list of attachments.

Have a look at the Marshal.PtrToStructure method: I don;t think it does what you expect: MSDN[^]

The best thing you can do is to put a breakpoint on the first line "aat = new ..." and single step through, because I don't think you are accessing anything useful at all!