PRB: Msmask32.ocx Does Not Work Properly in MFC Containers

The information in this article applies to:

• The Microsoft Masked Edit Control included with: Microsoft Visual C++, 32-bit Edition, version 4.0

SYMPTOMS

When the Masked Edit Control's Format property is set, it does not automatically format its contents upon losing focus. When embedded in a Visual Basic 4.0 form or Microsoft Access 7.0 form, the control automatically formats its contents when the control loses focus.

CAUSE

The Masked Edit Control uses a proprietary Visual Basic interface called IVBFormat. The absence of IVBFormat support in a control container prevents the Masked Edit Control from automatically updating its contents as specified by the Format property. Control containers created with Visual C++ do not support IVBFormat. Other control containers, such as Visual FoxPro 3.0 forms, which do not support this interface, will also experience limited functionality from the Masked Edit Control.

RESOLUTION

The IVBFormat interface is proprietary and subject to change. Documentation or specifications for this interface are not available. The Masked Edit Control can be used in a Visual C++ control container application, but the automatic formatting feature will remain disabled. Other properties such as the control's Mask property, will function properly in the absence of IVBFormat support.

STATUS

This behavior is by design.