PRB: MAPIInitialize from Console App can Block Windows Messages (171428)

The information in this article applies to:

Microsoft Extended Messaging Application Programming Interface (MAPI)

This article was previously published under Q171428

SYMPTOMS

Calling the MAPIInitialize() function from a console application can block windows messages to other Windows applications.

CAUSE

The console application has not provided a message loop to allow the Windows Operating System to address the requests of other Windows applications.

RESOLUTION

Write the code as a Windows application or alternately try using the PeekMessage loop API call.

For more information on implementing PeekMessage loop functionality, please see the following article(s) in the Microsoft Knowledge Base:

74042 How to Use PeekMessage() Correctly in Windows

STATUS

This behavior is by design.

MORE INFORMATION

Code sample that demonstrates issue follows:

    #include "mapix.h"
    #include "conio.h"

    void main()
    {
       HRESULT hrT = NOERROR;
       hrT = MAPIInitialize(NULL);
       getch();
    }

Build the code sample above as a console application.
Run the application.
Switch to the Control Panel and launch Date/Time
Change the date and click OK.

Step 4 should close Date/Time, but it remains open and blocked until the (MAPIInitialize) application is closed.

Modification Type:	Minor	Last Reviewed:	8/18/2005
Keywords:	kbcode kbMsg kbprb KB171428 kbAudDeveloper