WinInvalidateRect - Parameters

hwnd (HWND) - input

Handle of window whose update region is to be changed.

HWND_DESKTOP

This function applies to the whole screen (or desktop).
Other
Handle of window whose update region is to be changed.

pwrc (PRECTL) - input

Update rectangle.

Note: The value of each field in this structure must be in the range -32 768 through 32 767. The data type WRECT can also be used, if supported by the language.

NULL

The whole window is to be added into the window's update region.
Other
Rectangle to be added to the window's update region.

fIncludeChildren (BOOL) - input

Invalidation-scope indicator.

TRUE

Include the descendants of hwnd in the invalid rectangle.
FALSE
Include the descendants of hwnd in the invalid rectangle, but only if the parent does not have a WS_CLIPCHILDREN style.

rc (BOOL) - returns

Success indicator.

TRUE

Successful completion
FALSE
Error occurred.

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