Sending a Message

Article
08/28/2006

New messages are always created and sent from a message store's Drafts folder. After you create a message, you set its property values (subject, body, list of recipients, and so on) and then post the message.

To send a message

Initialize the MAPI subsystem, and log onto a MAPI session. For more information, see How to: Begin a MAPI Session.
Establish a connection to a message store. For more information, see How to: Connect to a Message Store.
Create a message object. For more information, see How to: Create a Message.
Prepare and set the list of recipients for the message. Typically, there are three properties to set for each recipient: PR_RECIPIENT_TYPE, PR_ADDRTYPE, and PR_EMAIL_ADDRESS.
1. Allocate memory for the list of recipients by calling MAPIAllocateBuffer with the total size of the recipient list:
```
ULONG cRecipients = 1;  // Sending this to only 1 person.
LPWSTR pszTo = L"you@mycompany.com";  // Address of recipient.
ULONG cRecProps = 3;  // Setting 3 properties for each recipient.
LPADRLIST pRecList = NULL;
ULONG cbRecList = 0;
cbRecList = sizeof(ADRLIST) + 
            cRecipients * (sizeof(ADRENTRY) + 
                cRecProps * (sizeof(SPropValue) + 
                    (wcslen(pszTo)+3) * sizeof(WCHAR) ) );
hr = MAPIAllocateBuffer(cbRecList, (void **)&pRecList);
```
2. Initialize the recipient list by using memset to set the entire buffer to 0, and then begin filling in values for the recipient list:
```
LPSPropValue pRecVal = NULL;
memset((void *)pRecList, 0, cbRecList);
pRecList->cEntries = cRecipients;
pRecList->aEntries[0].cValues = cRecProps;
pRecVal = pRecList->aEntries[0].rgPropVals;
```
3. Set the recipient type property value to indicate whether the recipient is listed on the To:, Cc:, or Bcc: fields by using the PR_RECIPIENT_TYPE property. This is the first of three properties that are being set in the recipient list:
```
pRecVal[0]->ulPropTag = PR_RECIPIENT_TYPE;
pRecVal[0]->Value.ul = MAPI_TO;
```
4. Set the address type property value to SMTP by using the PR_ADDRTYPE property. This is the second of three properties that are being set in the recipient list:
```
pRecVal[1]->ulPropTag = PR_ADDRTYPE;
pRecVal[1]->Value.lpszW = L"SMTP";
```
5. Set the e-mail address for each message recipient by using the PR_EMAIL_ADDRESS property. This is the third and final property that is being set in the recipient list:
```
pRecVal[2]->ulPropTag = PR_EMAIL_ADDRESS;
pRecVal[2]->Value.lpszW = pszTo;
```
6. Add the list of recipients to your message by calling the IMessage::ModifyRecipients method with the MODRECIP_ADD flag:
```
hr = pMsg->ModifyRecipients(MODRECIP_ADD, pRecList);
```
7. Free the memory buffer for the list of recipients by calling MAPIFreeBuffer.
```
hr = MAPIFreeBuffer((void *)pRecList);
pRecVal = NULL;
```
Prepare and set the following properties of the message: PR_MSG_STATUS, PR_MESSAGE_FLAGS, and PR_SUBJECT.
1. Allocate memory for the message property array by calling MAPIAllocateBuffer with the total size of the message properties:
```
ULONG cMsgProps = 3;  // Setting 3 properties for the message.
LPWSTR pszSubject = L"MySubject";  // Subject line of message.
LPSPropValue pMsgVal = NULL;
ULONG cbMsgVal = 0;
cbMsgVal = cMsgProps * (sizeof(SPropValue) + 
               (wcslen(pszSubject)+3) * sizeof(WCHAR) );
hr = MAPIAllocateBuffer(cbMsgVal, (void **)&pMsgVal);
```
2. Initialize the message property array by using memset to set the entire buffer to 0:
```
memset((void *)pMsgVal, 0, cbMsgVal);
```
3. Identify the message as SMTP by using the PR_MSG_STATUS property to set the message status to MSGSTATUS_RECTYPE_SMTP. This is the first of three properties that are being set for the message:
```
pMsgVal[0]->ulPropTag = PR_MSG_STATUS;
pMsgVal[0]->Value.ul = MSGSTATUS_RECTYPE_SMTP;
```
4. Identify the current state of the message as unsent by using the PR_MESSAGE_FLAGS property to set the MSGFLAG_UNSENT flag. This is the second of three properties that are being set for the message:
```
pMsgVal[1]->ulPropTag = PR_MESSAGE_FLAGS;
pMsgVal[1]->Value.ul = MSGFLAG_UNSENT;
```
5. Set the subject by using the PR_SUBJECT property. This is the third and final property that is being set for the message:
```
pMsgVal[2]->ulPropTag = PR_SUBJECT;
pMsgVal[2]->Value.lpszW = pszSubject;
```
6. Apply the property values to the message by calling the IMAPIProp::SetProps method on the message object:
```
hr = pMsg->SetProps(cMsgProps, pMsgVal, NULL);
```
7. Free the memory buffer for the message property array by calling MAPIFreeBuffer.
```
hr = MAPIFreeBuffer((void *)pMsgVal);
```
Prepare and write the textual body of the message.
1. Declare a NULL IStream interface object, and then call the IMAPIProp::OpenProperty method of the message object to obtain a reference to the message body text stream interface object:
```
IStream * pStm = NULL;
hr = pMsg->OpenProperty(PR_BODY, 
                        NULL, 
                        0, 
                        MAPI_MODIFY, 
                        (LPUNKNOWN *)&pStm);
```
2. Write the text of the body of the message by calling the IStream::Write method of the stream object:
```
LPWSTR pszBody = L"Text in Body of Message.";
ULONG cbBody = 0;
ULONG cbWritten = 0;
cbBody = (wcslen(pszBody)+1) * sizeof(WCHAR);
hr = pStm->Write(pszBody, cbBody, &cbWritten);
```
3. If it is no longer needed, release the stream object by calling IUnknown::Release on it:
```
pStm->Release();
pStm = NULL;
```
Submit the message by calling the IMessage::SubmitMessage method of the message object:
```
hr = pMsg->SubmitMessage(0);
```
If it is no longer needed, release the message object by calling IUnknown::Release on it:
```
pMsg->Release();
pMsg = NULL;
```

Code Sample

The Windows Mobile Version 5.0 Pocket PC and Smartphone SDKs ship with a code sample called Sending e-mail. The default location for the the sample is C:\Program Files\Windows CE Tools\wce500\Windows Mobile 5.0 Pocket PC SDK\Samples\CPP\Win32\Sendmail\. To load the code sample, double-click the SendMail.sln solution file.

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