Microsoft KB Archive/175768

= FIX: ActiveX MAPI Control 5.0 Causes Memory Errors =

Article ID: 175768

Article Last Modified on 3/24/2000

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APPLIES TO


 * Microsoft Visual FoxPro 5.0 Standard Edition
 * Microsoft Visual FoxPro 5.0a

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This article was previously published under Q175768



SYMPTOMS
When you add a MAPISession control version 5.0 or a MAPIMessages control version 5.0 to a form and then edit the (Messaging Application Programming Interface) MAPI control properties, a memory corruption error appears.



RESOLUTION
One possible resolution is to copy the older Msmapi32.ocx version 1.0.2815 from another computer that is currently running Visual FoxPro version 5.0 or extract the file from the Visual FoxPro 5.0 install disks.

For additional information on using the extract utility, please see the following article in the Microsoft Knowledge Base:

135518 HOWTO: Copy Files from Cabinets on DMF-Formatted Disks

NOTE: This resolution will only work as long as another application does not install version 5.0 of the Msmapi32.ocx over version 1.0.2815. These applications may include Visual Basic version 5.0, Visual FoxPro for Windows version 5.0a or an executable file created by one of these applications.

NOTE: This error has not been corrected in Service Pack 1 or Service Pack 2.



STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This has been corrected in Visual FoxPro 6.0.



MORE INFORMATION
Once you try to edit or make changes to any of the MAPISession control or MAPIMessages control specific properties, the following error is displayed:

OLE Idispatch exception code 0 from MAPISession: Property is write-only.

-or-

OLE Idispatch exception code 0 from MAPIMessages: Property is write-only.

This will not prevent the control from being edited. Click OK and then right-click the control to display the short-cut menu. Choose MAPISession or MAPIMessage Properties to open the Property Pages dialog box. Change one of the properties then click Apply or OK. In Windows 95, the following error message appears:

This program performed an illegal operation and will be shut down.

After clicking the Details push button, the following message appears:

VFP caused and invalid pagefault in module KERNEL32.DLL at.

In Windows NT 4.0, the following error appears:

An application error had occurred and an application error log is being generated. VFP.EXE Exception: access violation.

NOTE: If you get this error multiple times, the error log file may get larger. You may delete the User.dmp file to free up the space used by this log file.

Steps to Reproduce Behavior
The following two methods reproduce the application error. Method 1:


 * 1) Create a new form.
 * 2) In the Tools Options menu, click the Controls tab. Click ActiveX controls, then scroll down the list and select both Microsoft MAPI Messages Control, version 5 and Microsoft MAPI Session Control, version 5. Click OK.
 * 3) On the Form Controls toolbar, click the View Classes button and select ActiveX Controls.
 * 4) Click one of the MAPI controls and add it to the form.
 * 5) Save and run the form.
 * 6) Modify the form. Right-click on the control. The write-only message described appears. Click OK. Right-click the control again and select Microsoft MAPI Message (or Session) Control Properties.
 * 7) Change any of the properties and choose OK or Apply.

Method 2:


 * 1) Follow steps 1-3 in Method 1 above.
 * 2) Before you add one of the MAPI ActiveX controls to the form, close the Properties sheet of the form if it is open.
 * 3) Click one of the MAPI controls and add it to the form.
 * 4) Right-click on the control and select Microsoft MAPI Message (or Session) Control Properties.
 * 5) Make a change to any of the properties and click OK.
 * 6) Click on the form to re-gain focus. Right-click on the form and choose

Properties to open the Properties sheet.


 * 1) Right-click on the MAPI control again. The write-only message described above appears. Click OK. Right-click the control again and select Properties.
 * 2) Change any of the properties and click OK or Apply.

(c) Microsoft Corporation 1997, All Rights Reserved. Contributions by Dean Christopher, Microsoft Corporation

Keywords: kbbug kbfix kbvfp600fix kbprb KB175768

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