?? getdcex.htm
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<td width="100%" height="16"><a name="GetDCEx">GetDCEx</a></td>
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<td width="103%" colspan="3">VB聲明</td>
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<td width="103%" colspan="3">Declare Function GetDCEx Lib "user32" Alias
"GetDCEx" (ByVal hwnd As Long, ByVal hrgnclip As Long, ByVal fdwOptions As Long)
As Long</td>
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<td width="103%" colspan="3">說明</td>
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<td width="103%" colspan="3">為指定窗口獲取設備場景。相比<a href="GetDC.htm" tppabs="http://www.gxbcts.com/airfly/api/papi/GetDC.htm">GetDC</a>，本函數提供了更多的選項</td>
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<td width="103%" colspan="3">返回值</td>
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<td width="103%" colspan="3">Long，執行成功為指定窗口設備場景句柄。出錯則為0</td>
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<td width="103%" colspan="3">參數表</td>
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<td width="25%">參數</td>
<td width="78%" colspan="2">類型及說明</td>
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<td width="25%">hwnd</td>
<td width="78%" colspan="2">Long，窗口句柄</td>
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<td width="25%">hrgnclip</td>
<td width="78%" colspan="2">Long，窗口剪裁區</td>
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<td width="25%" rowspan="13">fdwOptions</td>
<td width="78%" colspan="2">Long，標志字。根據下列常數設置各位：</td>
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<td width="37%">DCX_CACHE</td>
<td width="38%">不管窗口類的樣式，從windows緩存獲取設備場景</td>
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<td width="37%">DCX_CLIPCHILREN</td>
<td width="38%">所有可見的子窗口區都要從DC的剪裁區中排除</td>
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<td width="37%">DCX_CLIPSIBLINGS</td>
<td width="38%">窗口hWnd上的所有可見兄弟窗口都要從DC的剪裁區中排除</td>
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<td width="37%">DCX_EXCLUDERGN</td>
<td width="38%">從DC剪裁區中排除由hrgnclip指定的區域</td>
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<td width="37%">DCX_EXCLUDEUPDATE</td>
<td width="38%">從設備場景剪裁區中排除刷新區域</td>
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<td width="37%">DCX_INTERSECTRGN</td>
<td width="38%">由hrgnclip指定的區域與設備場景剪裁區相交</td>
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<td width="37%">DCX_INTERSECTUPDATE</td>
<td width="38%">指定區域與設備場景刷新區域相交</td>
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<td width="37%">DCX_LOCKWINDOWUPDATE</td>
<td width="38%">該標志為允許向窗口繪圖，即使它由于<a
href="LockWindowUpdate.htm" tppabs="http://www.gxbcts.com/airfly/api/papi/LockWindowUpdate.htm">LockWindowUpdate</a>的調用被鎖住</td>
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<td width="37%">DCX_NORESETATTRS</td>
<td width="38%">設備場景釋放后不被重置為默認狀態</td>
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<td width="37%">DCX_PARENTCLIP</td>
<td width="38%">放棄CS_PARENTDC類樣式設置。DC的起點設為hWnd窗口的左上角</td>
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<td width="37%">DCX_WINDOW</td>
<td width="38%">A device context is returned for the entire window rectangle rather than
just the client area of the window</td>
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<td width="37%">DCX_VALIDATE</td>
<td width="38%">Combine with DCX_INTERSECTUPDATE, validates the clipping region</td>
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<td width="103%" colspan="3">注解</td>
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<td width="103%" colspan="3"><p align="left">若窗口所屬類具有CS_OWNDC，
CS_CLASSDC 或 CS_PARENTDC樣式，則獲取的設備場景屬窗口或類專有。這時，設備場景狀態不能從初值修改。vb的窗體和控件通常是這種情況。否則，置DCX_CACHE位以從通用windows緩沖區恢復設備場景。若不置該位，則函數返回0。DC的狀態位默認設置。從緩存獲取的設備場景用過后要用<a
href="ReleaseDC.htm" tppabs="http://www.gxbcts.com/airfly/api/papi/ReleaseDC.htm">ReleaseDC</a>函數釋放以防止系統死鎖，因為windows只有5個緩存DC可用<br>
其他情況參見<a href="GetDC.htm" tppabs="http://www.gxbcts.com/airfly/api/papi/GetDC.htm">GetDC</a>函數注解</td>
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<td width="100%"><p align="right"><a href="#GetDCEx">Top</a></td>
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