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<html><head><script language="JavaScript"> function reset(){ for ( var i=0; i < document.Form1.elements.length; i++ ) { document.Form1.elements[i].options[0].selected=true }}function going(url){ parent.location=url; reset();}</script><style><!--A:link {text-decoration: none; color: #000000; font-family: 宋体}A:visited {text-decoration: none; color: #000000; font-family: 宋体}A:active {text-decoration: none; font-family: 宋体}A:hover {text-decoration: underline:#ffffff; color: #ff0000}body,table {font-size: 9pt; font-family: 宋体}.H1 {font-size: 9pt ; line-height:9pt; align=center}.ourfont {font-size: 9pt ; line-height:9pt; }.ourfont1 {font-size: 9pt ; line-height:9pt; }--></style><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><title>将JPEG格式文件转化为Windows墙纸 </title></head><body topmargin="0" leftmargin="0"><div align="center"><center><table border="0" cellPadding="0" cellSpacing="0" width="700"><tbody> <tr> <td><p class="content4"><span class="font"><img border="0" height="3" src="../../soft/pix.gif" width="700"></span></td> </tr></tbody></table></center></div><div align="center"><center><table border="0" cellPadding="0" cellSpacing="0" width="700"><tbody> <tr> <td bgColor="#3399ff" width="658"><p class="ourfont"><span class="font"> </span><a style="text-decoration: none; color: rgb(255,255,255)" href="../os/H00705-2.htm">操作系统</a><font color="#FFFFFF"><span class="font"><span> |</span></span></font><a style="color: rgb(255,255,255); text-decoration: none" href="../image/H00705-14.htm">图像处理</a><font color="#FFFFFF"><span>|<span class="font"> </span></span></font><a style="color: rgb(255,255,255); text-decoration: none" href="../autoCAD/H00705-19.htm">辅助设计</a><span class="font"><font color="#FFFFFF"><span> | </span></font></span><a style="color: rgb(255,255,255); text-decoration: none" href="../data/H00705-18.htm">数 据 库</a><span class="font"><font color="#FFFFFF"><span> | </span></font></span><a style="color: rgb(255,255,255); text-decoration: none" href="H00706-1.htm">高级编程</a><span class="font"><font color="#FFFFFF"><span> | </span></font></span><a style="color: rgb(255,255,255); text-decoration: none" href="../netuse/H00705-20.htm">网络应用</a><font color="#FFFFFF"><span><span class="font"> | </span></span></font><a style="color: rgb(255,255,255); text-decoration: none" href="../webpage/H00705-21.htm">网页制作</a><font color="#FFFFFF"><span><span class="font"> |</span></span></font> <a style="color: rgb(255,255,255); text-decoration: none" href="../technic/H00706-3.htm">技术交流 </a><a style="color: rgb(255,255,255); text-decoration: none" href="http://202.100.13.77/clslyb/default.asp?clsid=jiaoc"><font color="#FFFFFF"><strong>过客留言</strong></font></a></td> <td bgColor="#3399ff" width="32"><p align="center" class="ourfont"><a href="mailto:net@163.sn.cn"><img src="../../soft/email.gif" alt="email.gif (493 字节)" border="0" WIDTH="20" HEIGHT="19"></a></td> </tr></tbody></table></center></div><div align="center"><center><table border="1" cellSpacing="1" width="700" bordercolor="#3399FF"><tbody> <tr> <td align="left" bgColor="#FFFFFF" vAlign="top" width="700" bordercolor="#0000FF" bordercolorlight="#0000FF" bordercolordark="#0000FF"><p class="ourfont"> </p> <p align="center">将JPEG格式文件转化为Windows墙纸 <br> <br> (长沙 汤文)</p> <p> JPEG是一种图像压缩标准，很多精美的图片都是采用这种格式标准，其特点是文件体积较小，而且支持24位色深。但是，Windows9x只支持位图文件(即以bmp为扩展名的文件)的墙纸。下面这个程序就是将以jpg或jpeg为扩展名的图片文件转化为位图文件，并通过修改注册表的键值来通知Windows更换墙纸。本程序使用了一个Tform；一个OpenPictureDialog用来让用户选择图片；三个SpeedButton；分别用来打开OpenPictureDialog对话框，确定更换墙纸,退出程序。程序全部代码如下：<br> unit Unit1;<br> interface<br> uses<br> Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, <br> Dialogs, jpeg, registry, ExtDlgs, StdCtrls, Buttons;<br> type<br> TForm1 = class(TForm)<br> SpeedButton1: TSpeedButton;<br> SpeedButton2: TSpeedButton;<br> SpeedButton3: TSpeedButton;<br> OpenPictureDialog1: TOpenPictureDialog;<br> procedure SpeedButton1Click(Sender: TObject);<br> procedure SpeedButton2Click(Sender: TObject);<br> procedure SpeedButton3Click(Sender: TObject);<br> private<br> { Private declarations }<br> public<br> { Public declarations }<br> end;<br> var<br> Form1: TForm1;<br> implementation<br> {＄R ＊.DFM}<br> procedure TForm1.SpeedButton1Click(Sender: TObject);<br> begin<br> openpicturedialog1.execute;{打开OpenPictureDialog对话框}<br> end;<br> procedure TForm1.SpeedButton2Click(Sender: TObject);<br> var<br> reg: tregistry;{Tregistry对象在Registry单元中声明，需要在Uese 中引用Registry单元}<br> jpeg: tjpegimage;{Tjpegimage对象在Jpeg单元中声明，需要在Uese 中引用Jpeg单元}<br> bmp: tbitmap;<br> begin<br> if (openpicturedialog1.filename=``)<br> then {判断OpenPictureDialog1中有无文件被选中} <br> messagedlg(`请选择一张图片`,mtinformation,[mbOK],0)<br> else<br> begin<br> jpeg:=tjpegimage.Create;<br> jpeg.LoadFromFile(openpicturedialog1.filename);{加载被用户选中的文件}<br> bmp:=tbitmap.Create;<br> bmp.assign(jpeg);<br> bmp.savetofile(`c:\windows\wall.bmp`);{将转换成功的文件保存的路径及文件名}<br> reg:=tregistry.Create;<br> reg.rootkey:=hkey_current_user;{设置根键名称}<br> reg.openkey(`control panel\desktop`,false);{打开Control Panel\Desktop路径对应的主<br> 键}<br> reg.writestring(`tilewallpaper`,`0`);<br> reg.writestring(`wallpaper`,`c:\windows\wall.bmp`);<br> {覆盖并写入新值TileWall－ paper和Wallpaper串}<br> systemparametersinfo(spi_setdeskwallpaper,0,nil,spif_sendchange);{通知win－dows更<br> 换墙纸}<br> reg.closekey;{写入更改内容并关闭注册表}<br> reg.Free;{释放对象}<br> close;<br> end;<br> end;<br> procedure TForm1.SpeedButton3Click(Sender: TObject);<br> begin<br> close;<br> end;<br> end.<br> 此程序只能将以jpg或jpeg为扩展名的图片文件转化为Windows的墙纸，因此应在OpenPictureDialog控件的Filter属性中筛选显示文件的类型，最好设置为JPEG Image File(＊.jpg)和JPEG Image File(＊.jpeg)文件。程序在中文Windows98,Delphi 4.0下编译通过。 </td> </tr></tbody></table></center></div><hr align="center" SIZE="1" width="700"><p align="center" class="ourfont"><span><span><font color="#000000"> <a style="color: rgb(0,0,0); 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