所属类别：编程

文章作者：杜运庆 天极网

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制作一个本企业的屏幕保护，在客户运行本企业的应用软件的时候，为客户更改屏幕保护，是个广告宣传的好办法。有很多朋友提出这个问题，现解答如下：

要更换屏幕保护，首先得做好一个屏幕保护(scr文件)，本例以 工程1.scr 这个文件为例。由于windows是把屏幕保护文件存放在system下，但记录屏幕保护文件位置的文件却是windows目录下的system.ini，所以，首先需要找出系统的windows和system目录的确切安装位置。因此，可以分如下几步进行：

1、找到windows和system目录的安装位置

2、把屏幕保护文件复制到system目录下

3、在system.ini中的[boot]中写入:

SCRNSAVE.EXE=C:\WINDOWS\SYSTEM\工程1.SCR

4、告诉系统切换屏幕保护。

下面的例子成功地改变了屏幕保护，全部源代码如下：'得到windows目录Private Declare Function GetWindowsDirectory Lib "kernel32" Alias "GetWindowsDirectoryA" (ByVal lpBuffer As String, ByVal nSize As Long) As Long'修改system.iniPrivate Declare Function WritePrivateProfileString Lib "kernel32" Alias "WritePrivateProfileStringA" (ByVal lpApplicationName As String, ByVal lpKeyName As Any, ByVal lpString As Any, ByVal lplFileName As String) As Long'得到system目录Private Declare Function GetSystemDirectory Lib "kernel32" Alias "GetSystemDirectoryA" (ByVal lpBuffer As String, ByVal nSize As Long) As Long'设置屏幕保护Private Const SPI_SETSCREENSAVETIMEOUT = 15Private Const SPI_SETSCREENSAVEACTIVE = 17Private Const SPIF_UPDATEINIFILE = amp;H1Private Const SPIF_SENDWININICHANGE = amp;H2Private Declare Function SystemParametersInfo Lib "user32" Alias "SystemParametersInfoA" (ByVal uAction As Long, ByVal uParam As Long, ByVal lpvParam As Long, ByVal fuWinIni As Long) As Long'启动屏幕保护Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As LongPrivate Const WM_SYSCOMMAND = amp;H112Private Const SC_SCREENSAVE = amp;HF140Private Sub Form_Load()　'得到system目录　Dim sSave As String, Ret As Long　sSave = Space(255)　Ret = GetSystemDirectory(sSave, 255)　sSave = Left$(sSave, Ret)　'把屏保复制到系统目录　FileCopy App.Path amp; "\工程1.scr", sSave amp; "\工程1.SCR"　'得到windows目录　Dim Path As String, strSave As String　strSave = String(250, Chr$(0))　Path = Left$(strSave, GetWindowsDirectory(strSave, Len(strSave)))　'修改system.ini　Dim r As Long　Dim iniPath As String　iniPath$ = Path + "\system.ini"　r = WritePrivateProfileString("boot", "SCRNSAVE.EXE", sSave amp; "\工程1.SCR", iniPath)　'设置时间间隔为1分钟=60秒　lRet = SystemParametersInfo(SPI_SETSCREENSAVETIMEOUT, 60, ByVal 0amp;,

　 SPIF_UPDATEINIFILE + SPIF_SENDWININICHANGE)　'设置屏幕保护　retval = SystemParametersInfo(SPI_SETSCREENSAVEACTIVE, True, 0, 0)　'启动屏幕保护　Dim result As Longresult = SendMessage(Form1.hwnd, WM_SYSCOMMAND, SC_SCREENSAVE, 0amp;)End Sub

本例在vb6.0+win95下运行通过。

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