HOWTO: Change the Name of a Second Instance of an Application

ID: Q10856

The information in this article applies to:

Microsoft Windows Software Development Kit (SDK) versions 3.0, 3.1

SUMMARY

When running a Windows-based application with multiple instances, check hPrevInstance if you need to know if your instance is the first instance. If it is NULL, this is a new instance of static data; if it is not NULL, it is not a new instance of static data. You can give the instance a unique name by doing either of the following:

Use CreateWindow() and give it a unique name.

Use GetWindowLong() to access the CREATSTRUCT structure passed when processing a WM_CREATE message and specifically change the lpszName field (if you want to change the caption name on the existing, already named instance).

You cannot change the icon name dynamically. You should use the second method to update the icon name from untitled to a unique name.

Additional query words:

Keywords : kb16bitonly kbSDKPlatform kbGrpUser kbWndw
Version : WINDOWS:3.0,3.1
Platform : WINDOWS
Issue type : kbhowto