FIX: Windows 95 GDI Leak with Show Window Contents Setting

MORE INFORMATION

Steps to Reproduce Problem

1. Install Microsoft Plus, and select the "Visual Enhancements" option when installing.
2. Using the right mouse button, click the Windows 95 desktop, and select Properties.
3. Click the Plus! tab, and select the "Show window contents while dragging" check box. The Plus! tab will not be available if Microsoft Plus is not installed.
4. Start the Windows 95 System Resource Meter from the Start Menu. Click the Start button. Then click Programs, click Accessories, click System Tools, and click Resource Meter. A green icon will appear in the Taskbar to the left of the clock.
   
   If the Resource Meter does not appear in the Start menu, it has not been installed. Install it by opening the Control Panel under My Computer. Click the Add/Remove Programs icon. Then click the Windows Setup tab, and select Accessories in the Components list. Click Details, and select the System Resource Meter check box in the Components list. Click the OK button twice. Windows 95 will prompt for the CD-ROM disc or floppy disk to complete the installation.
5. Start Visual FoxPro, and create a new project by clicking New on the File menu. Click Project, and then click New File. Type testproj in the Enter box of the Save As dialog box, and click Save.
6. Add a new form to the project by clicking the Documents tab of the Project Manager. Then select Forms, and click New. Click New Form to create the form.
7. Check the current System Resources by placing the mouse pointer over the green System Resource Meter icon in the taskbar. The percentage of available System, User, and GDI resources appears. Note the GDI percentage.
8. Click the Form Designer title bar in the center, hold down the mouse button and drag the mouse pointer around the Visual FoxPro desktop as follows: top right, top left, bottom left, bottom right. Repeat this about 20 times.
9. Repeat step 7, and read the GDI percentage. Observe that it falls by from 1% to 5% for each set of 20 drags of the form designer around the Visual FoxPro desktop.

Additional Notes

• The GDI does not leak memory if the Project Manager is not open or if "Show window contents while dragging" is not enabled.
• Closing all windows in Visual FoxPro will not fully recover the GDI resources lost. Closing Visual FoxPro itself will cause most or all of the GDI resources to be recovered.
• During a long programming session, the GDI resources will eventually become depleted. At this point, you need to exit Visual FoxPro and restart to recover the resources.