GetUpdateRgn

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GetUpdateRgn

VB聲明

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

說明

確定指定窗口的刷新區(qū)域。該區(qū)域當(dāng)前無效,需要刷新

返回值

Long,下列常數(shù)之一,以描述當(dāng)前剪裁區(qū):

COMPLEXREGION:該區(qū)域有互相交疊的邊界

SIMPLEREGION:該區(qū)域邊界沒有互相交疊

NULLREGION:區(qū)域為空

ERRORAPI:發(fā)生了錯誤

參數(shù)表

參數(shù)

類型及說明

hwnd

Long,將確定刷新區(qū)域的窗口的句柄

hRgn

Long,裝載hwnd窗口刷新區(qū)域的區(qū)域句柄

fErase

Long,為非零值表示窗口背景應(yīng)擦除,客戶區(qū)外的窗口部分是被重畫

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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