GetUpdateRgn

GetUpdateRgn

VB声明

Declare Function GetUpdateRgn Lib "user32" Alias "GetUpdateRgn" (ByVal hwnd As Long, ByVal hRgn As Long, ByVal fErase As Long) As Long

说明

确定指定窗口的刷新区域。该区域当前无效,需要刷新

返回值

Long,下列常数之一,以描述当前剪裁区:

COMPLEXREGION:该区域有互相交叠的边界

SIMPLEREGION:该区域边界没有互相交叠

NULLREGION:区域为空

ERRORAPI:发生了错误

参数表

参数

类型及说明

hwnd

Long,将确定刷新区域的窗口的句柄

hRgn

Long,装载hwnd窗口刷新区域的区域句柄

fErase

Long,为非零值表示窗口背景应擦除,客户区外的窗口部分是被重画

原文:TRUE (nonzero) to specify that the window background should be erased and parts of the window outside of the client area should be redrawn.

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