MAPISendMessage, doesn't work on first try

I made it work now, but it won't send on the first try. If i try again, it works fine..
Any suggestions?

Here's the code for the function:

Code:

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int DLLEXPORT CALLBACK sendMail(unsigned long hWnd, char *achSubj, char *achRec, char *achSender, char *achAttPath){
        unsigned long lRes;
        char dt[9], dateBuf[11];
        MapiMessage *msg = new MapiMessage();
        MapiRecipDesc *msgAvs = new MapiRecipDesc[1], *msgMott = new MapiRecipDesc[1];
        MapiFileDesc *msgFile = new MapiFileDesc();
        HINSTANCE h1;
        F1 SendMail;

        _strdate(dt);       
        dt[2]='\0';dt[5]='\0';
        sprintf(dateBuf,"20%s.%s.%s", dt+6, dt, dt+3);

        // Link MAPI32
        if((h1 = LoadLibrary("Mapi32"))==NULL)
                return(1);        // Couldn't link to Mapi32

        //typedef unsigned long (CALLBACK *F1)(LHANDLE lhSession, ULONG ulUIParam, lpMapiMessage lpMessage, FLAGS flFlags, ULONG ulReserved);
        if(!(SendMail = (F1)GetProcAddress(h1, "MAPISendMail"))){
                FreeLibrary(h1);
                return(2);
        }

        // Fill Originator struct
        msgAvs->ulReserved = 0;
        msgAvs->ulRecipClass = MAPI_ORIG;
        msgAvs->lpszName = achSender;
        msgAvs->lpszAddress = achSender;
        msgAvs->lpEntryID = NULL;
        msgAvs->ulEIDSize = 0;

        // Fill recipient struct
        msgMott->ulReserved = 0;
        msgMott->ulRecipClass = MAPI_TO;
        msgMott->lpszName = achRec;
        msgMott->lpszAddress = achRec;
        msgMott->lpEntryID = NULL;
        msgMott->ulEIDSize = 0;

        // Fill file struct
        msgFile->ulReserved = 0;
        msgFile->flFlags = 0;
        msgFile->nPosition = 0xFFFFFFFF;
        msgFile->lpszPathName = achAttPath;        // Path\filnavn
        msgFile->lpFileType = NULL;

        // Fill messageStruct
        msg->ulReserved=0;
        msg->lpszSubject = achSubj;
        msg->lpszNoteText = NULL;
        msg->lpszMessageType = NULL;
        msg->lpszDateReceived = dateBuf;
        msg->lpszConversationID = "";
        msg->flFlags = MAPI_SENT;
        msg->lpOriginator = msgAvs;
        msg->nRecipCount = 1;
        msg->lpRecips = msgMott;
        msg->nFileCount = 1;
        msg->lpFiles = msgFile;

        lRes = SendMail(NULL, hWnd, msg, MAPI_LOGON_UI, 0);

        delete msgAvs;
        delete msgMott;
        delete msgFile;
        delete msg;

        FreeLibrary(h1);

        return((int)lRes);
}

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lRes=11, but the attachment exists, i've checked it.
There's no difference between the first/second call, so i figured there was some initialization missing..?
Also, how can i send it directly without starting Outlook?

I finally figured it out: You have have to memset the structures to 0 before use...