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:

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);
}

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...