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<TD style="FONT-SIZE: 12pt; COLOR: #ff6600" align=middle
height=32>在C++ Builder中实现桌布自动更新</TD></TR>
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<TD align=middle bgColor=#f7f7f7
height=25>作者：佚名 来源：不详 发布时间：25/09/2006
19:57:06 发布人：admin</TD></TR>
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id=font_word
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center"
align=center><SPAN><o:p></o:p></SPAN> </P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''''Times New Roman''''; mso-hansi-font-family: ''''Times New Roman''''">在</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">C++
Builder</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''''Times New Roman''''; mso-hansi-font-family: ''''Times New Roman''''">中要实现桌布的自动更换功能，我认为主要两个关键点，其一既然要“自动”</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''''Times New Roman''''; mso-hansi-font-family: ''''Times New Roman''''">那就免不了要用到定时器，我们可以用</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">Timer</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''''Times New Roman''''; mso-hansi-font-family: ''''Times New Roman''''">这个组件来完成，这个还好解决，第二个问题可能比较麻烦了，我们如何来设置桌布，好像</SPAN><SPAN
lang=EN-US><FONT
face="Times New Roman">BCB</FONT></SPAN><SPAN>中并没有提供什么组件，那我们也就只好自力更生了，虽说本人只是一只菜鸟，但这个问题还是难不了我，它主要是用到了<FONT
face="Times New Roman">SystemParametersInfo</FONT></SPAN><SPAN
lang=EN-US><FONT face="Times New Roman"> </FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''''Times New Roman''''; mso-hansi-font-family: ''''Times New Roman''''">这个</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman"><A class=wordstyle
href="http://www.malegebide.com/" target=_blank>Windows</A>
API</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''''Times New Roman''''; mso-hansi-font-family: ''''Times New Roman''''">函数，它的声明如下：</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><CODE><SPAN
lang=EN-US><FONT size=2>BOOL
SystemParametersInfo(<o:p></o:p></FONT></SPAN></CODE></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><CODE><SPAN
lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 黑体"><SPAN
style="mso-spacerun: yes">
</SPAN>UINT</SPAN></CODE><CODE><I><SPAN lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 黑体">
uiAction</SPAN></I></CODE><CODE><SPAN lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 黑体">, </SPAN></CODE><CODE><SPAN
lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 黑体">// system
parameter to query or set<o:p></o:p></SPAN></CODE></P><PRE><CODE><FONT size=2><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"> </SPAN>UINT</SPAN><I><SPAN lang=EN-US> uiParam</SPAN></I><SPAN>,<SPAN style="mso-spacerun: yes"> </SPAN>// depends on action to be taken<o:p></o:p></SPAN></FONT></CODE></PRE><PRE><CODE><FONT size=2><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"> </SPAN>PVOID</SPAN><I><SPAN lang=EN-US> pvParam</SPAN></I><SPAN>, // depends on action to be taken<o:p></o:p></SPAN></FONT></CODE></PRE><PRE><CODE><FONT size=2><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"> </SPAN>UINT</SPAN><I><SPAN lang=EN-US> fWinIni</SPAN></I><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"> </SPAN>// user profile update flag<o:p></o:p></SPAN></FONT></CODE></PRE><PRE><CODE><SPAN lang=EN-US><FONT size=2>);<o:p></o:p></FONT></SPAN></CODE></PRE><PRE><SPAN style="FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: 宋体; mso-ascii-font-family: ''''Times New Roman''''; mso-hansi-font-family: ''''Times New Roman''''; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: ''''Times New Roman''''">它是一个非常重量级的函数，主要用来设置或获得系统范围上的相关参数</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: ''''Times New Roman''''; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-fareast-font-family: 宋体">(</SPAN><SPAN style="FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: 宋体; mso-ascii-font-family: ''''Times New Roman''''; mso-hansi-font-family: ''''Times New Roman''''; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: ''''Times New Roman''''">如：我</SPAN></PRE><PRE><SPAN style="FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: 宋体; mso-ascii-font-family: ''''Times New Roman''''; mso-hansi-font-family: ''''Times New Roman''''; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: ''''Times New Roman''''">正在介绍的“如何设置桌布”，还有如：系统字体，屏幕分辨率等</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: ''''Times New Roman''''; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-fareast-font-family: 宋体">)</SPAN><SPAN style="FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: 宋体; mso-ascii-font-family: ''''Times New Roman''''; mso-hansi-font-family: ''''Times New Roman''''; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: ''''Times New Roman''''">，其实光从字</SPAN></PRE><PRE><SPAN style="FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: 宋体; mso-ascii-font-family: ''''Times New Roman''''; mso-hansi-font-family: ''''Times New Roman''''; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: ''''Times New Roman''''">面上也能大概知道它的作用。</SPAN><SPAN style="FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: 宋体; mso-ascii-font-family: ''''Times New Roman''''; mso-hansi-font-family: ''''Times New Roman''''; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: ''''Times New Roman''''">如果只是简单的调用</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: ''''Times New Roman''''; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-fareast-font-family: 宋体">SystemParametersInfo</SPAN><SPAN style="FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: 宋体; mso-ascii-font-family: ''''Times New Roman''''; mso-hansi-font-family: ''''Times New Roman''''; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: ''''Times New Roman''''">函数的话，</SPAN></PRE><PRE><SPAN style="FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: 宋体; mso-ascii-font-family: ''''Times New Roman''''; mso-hansi-font-family: ''''Times New Roman''''; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: ''''Times New Roman''''">问题就变得简单多了，但你要总不能只使用默认的桌布样式，所以在设置桌布之</SPAN></PRE><PRE><SPAN style="FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: 宋体; mso-ascii-font-family: ''''Times New Roman''''; mso-hansi-font-family: ''''Times New Roman''''; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: ''''Times New Roman''''">前还应先设置好桌布的样式，比如：桌布的显示位置，是否填满桌面等，然后在</SPAN></PRE><PRE><SPAN style="FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: 宋体; mso-ascii-font-family: ''''Times New Roman''''; mso-hansi-font-family: ''''Times New Roman''''; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: ''''Times New Roman''''">调用</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: ''''Times New Roman''''; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-fareast-font-family: 宋体">SystemParametersInfo</SPAN><SPAN style="FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: 宋体; mso-ascii-font-family: ''''Times New Roman''''; mso-hansi-font-family: ''''Times New Roman''''; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: ''''Times New Roman''''">函数，这个函数会根据注册表里的桌布样式设置情况来</SPAN></PRE><PRE><SPAN style="FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: 宋体; mso-ascii-font-family: ''''Times New Roman''''; mso-hansi-font-family: ''''Times New Roman''''; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: ''''Times New Roman''''">设置实际的桌布样式。</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: ''''Times New Roman''''; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-fareast-font-family: 宋体"><o:p></o:p></SPAN></PRE><PRE><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: ''''Times New Roman''''; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-fareast-font-family: 宋体"><o:p></o:p></SPAN></PRE><PRE><SPAN style="FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: 宋体; mso-ascii-font-family: ''''Times New Roman''''; mso-hansi-font-family: ''''Times New Roman''''; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: ''''Times New Roman''''">与桌布样式有关的注册表设定:(位于</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: ''''Times New Roman''''; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-fareast-font-family: 宋体">HKEY_CURRENT_USER\Control Panel\Desktop</SPAN><SPAN style="FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: 宋体; mso-ascii-font-family: ''''Times New Roman''''; mso-hansi-font-family: ''''Times New Roman''''; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: ''''Times New Roman''''">键）</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: ''''Times New Roman''''; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-fareast-font-family: 宋体"><o:p></o:p></SPAN></PRE>
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