Microsoft KB Archive/171429

= How To Set and Clear a CDO (1.x) MessageFilter via VC++ =

Article ID: 171429

Article Last Modified on 5/9/2005

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APPLIES TO


 * Microsoft Collaboration Data Objects 1.1
 * Microsoft Collaboration Data Objects 1.2
 * Microsoft Collaboration Data Objects 1.21

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This article was previously published under Q171429



SUMMARY
Changes to the CDO (1.1, 1.2, 1.21) MessageFilter properties appear to have no effect.



MORE INFORMATION
The following code sample shows how to activate, then deactivate a CDO (1.1, 1.2, 1.21) MessageFilter via Visual C++.

The key to successfully shutting or altering the MessageFilter is to be sure to destroy any reference that is made to any object related to the MessageFilter (also known as Folder:MessagesCollection:MessageFilter).

Code Sample:
/**********************************************************/   // MSGFILTER.CPP // -  // This program demonstrates how the CDO (1.1, 1.2, 1.21) // MessageFilter works via VC++. This sample requires VC++ // version 5.0 or higher. /**********************************************************/

// TO DO: If you are using CDO (1.1) unremark the next line: // #import  no_namespace

// TO DO: If you are using CDO (1.2, 1.21) unremark the next line: // #import  no_namespace

#import  no_namespace

#include   #include    #include 

void dump_com_error(_com_error &e) {      _tprintf(_T("Oops - hit an error!\n")); _tprintf(_T("\a\tCode = %08lx\n"), e.Error); _tprintf(_T("\a\tCode meaning = %s\n"), e.ErrorMessage); _bstr_t bstrSource(e.Source); _bstr_t bstrDescription(e.Description); _tprintf(_T("\a\tSource = %s\n"), (LPCTSTR) bstrSource); _tprintf(_T("\a\tDescription = %s\n"), (LPCTSTR) bstrDescription); }

// If this is placed in the scope of the smart pointers, they must be  // explicitly Release(d) before CoUninitialize is called. If any // reference count is non-zero, a protection fault will occur. struct StartOle { StartOle { CoInitialize(NULL); } ~StartOle { CoUninitialize; } } _inst_StartOle;

void main {  try {         // Uncomment one of the next two lines of code as appropriate: // Create a MAPI.Session pointer with CDO (1.1) // SessionPtr pSession("MAPI.Session"); // or Create a MAPI.Session pointer with CDO (1.2, 1.21) // _SessionPtr pSession("MAPI.Session");

// Logon using the specified profile pSession->Logon("YourValidProfileNameHere");

// Create pointer to the Inbox Folder FolderPtr pFolder = pSession->Inbox;

// Create pointer to the Messages Collection MessagesPtr pMessages = pFolder->Messages;

// Get the first Message object before filter is applied MessagePtr pAMessage = pMessages->GetFirst;

// Process contents of Folder while (pAMessage != NULL) {             // Display Properties MessageBoxW (NULL,pAMessage->Subject.bstrVal,NULL,MB_OK);

// Get next Message pAMessage = NULL; pAMessage = pMessages->GetNext; }

// Destroy the reference to the to the Inbox, Messages // Collection, and Message then reaquire them pFolder = NULL; pMessages = NULL; pAMessage = NULL;

// Aquire pointer to the Inbox Folder pFolder = pSession->Inbox;

// Aquire pointer to the Messages Collection pMessages = pFolder->Messages;

// Acquire pointer and set properties of the MessageFilter MessageFilterPtr pMsgFilt = pMessages->Filter; pMsgFilt->Unread = (bool)TRUE;

// Get the first Message object after filter is applied pAMessage = pMessages->GetFirst;

// Process contents of Folder while (pAMessage != NULL) {             // Display Properties MessageBoxW (NULL,pAMessage->Subject.bstrVal,NULL,MB_OK);

// Get next Message pAMessage = NULL; pAMessage = pMessages->GetNext; }

// Destroy the reference to the Inbox, Messages Collection, // MessageFilter, and Message then reaquire them pFolder = NULL; pMessages = NULL; pMsgFilt = NULL; pAMessage = NULL;

// GetFirst without a filter in place // Aquire pointer to the Inbox Folder pFolder = pSession->Inbox;

// Aquire pointer to the Messages Collection pMessages = pFolder->Messages;

// Get the first Message object after filter is unapplied pAMessage = pMessages->GetFirst;

// Process contents of Folder while (pAMessage != NULL) {             // Display Properties MessageBoxW (NULL,pAMessage->Subject.bstrVal,NULL,MB_OK);

// Get next Message pAMessage = NULL; pAMessage = pMessages->GetNext; }

// Logoff of the MAPI Session pSession->Logoff; }     catch (_com_error &e) {         dump_com_error(e); }  }

Keywords: kbhowto kbmsg kbcode KB171429

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