VB6 App Strange Behavior
Posted on 2006-11-13
It is a small MDI application, with 10 forms. Its uses one third party COM component. Entirely Developed in VB6 SP6.
Development System o/s is Windows 2000 server, Deployed to Win XP Home Sp2.
In the application i want to prevent multiple instance. so i used below code.
in the Form_Load
If App.PrevInstance = True Then
MsgBox("Application running already")
End 'Tried Unload Me also
Now, when i tested in my Deleloment system, first instance everything is OK, but for second instance i am getting the message box saying that "Application running already", but still application is opened. And the second application is not producing any menu events.
When i tested in Win XP system, Application is not visible for first instance. In the task manager it is showing that application is running. If i try to open second instance, the message box "Application running already" came, but still second application is opened. As usual no events are firing in this application.
One more strange is that, first instance is taking 98% CPU resources in Win XP system (where it was 1 or 2 in Developed system)
Where is the problem? Application is running smoothly from Visual Studio 6 (SP6)