INFO: Possible Causes for System Resource Reduction

• Microsoft Windows Software Development Kit (SDK) 3.1

SUMMARY

You can note via Program Manager's "About Box" that Windows's System Resources can be inadvertently reduced by a Windows-based application, causing subsequent RegisterWindow() or CreateWindow() function calls to fail.

The system resources are a reflection of the lower USER and GDI's data segments. The following steps eliminate the major causes of USER's data segment fill-up listed in the following:

• Ensure that the cbClsExtraBytes and cbWndExtraBytes are set to 0 in the WNDCLASS structure, unless the application is definitely using them.



• Ensure that a MakeProcInstance() is performed and the window procedure is EXPORTed in the .DEF file.



• Use CVW to verify that the application is receiving the WM_CREATE message.



• Confirm that all menus created, loaded, or added dynamically [that is, using CreateMenu(), AppendMenu(), and so forth] are properly destroyed before terminating the application.

Additional query words: 3.00 3.10

Keywords : kb16bitonly kbSDKPlatform kbSysSettings
Version : WINDOWS:3.1
Platform : WINDOWS
Issue type : kbinfo