用Visual C＃编写屏幕保护程序
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Visual C#是微软公司推出的新一代程序开发语言，是微软.Net框架中的一个重要组成部分。屏幕保护程序是以scr为扩展名的标准Windows可执行程序。屏幕保护程序不仅可以延长显示器的使用寿命，还可以保护私人信息。本文向大家介绍一个.Net平台上用C#编写的一个动态文本及图形的屏幕保护程序。
一、具体实现步骤：
（1）在Visual Studio.Net下新建一个C＃的Windows应用程序工程，不妨命名为screen_saver。
（2）现在我们来设计程序的主界面：
先将窗体的Name属性设置为screen、Text属性设置为空，BackColor属性设置为Black、Size属性设置为(800, 600)、 ControlBox、MaximizeBox、MinimizeBox、ShowInTaskbar属性设置均为false、FormBorderStyle属性设置为None。再往窗体上添加Label控件、PictureBox控件、Timer控件各一个。将Label控件的Name设置为word、Text属性设置为空；将PictureBox控件的Name设置为picture1、Image设置为一个预知图片；将Timer控件的Name设置为timerSaver、Enabled 属性设为true、Interval属性设为5。
（3）现在我们开始编写完整程序代码部分：
//导入使用到的名称空间
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
file://
namespace screen_saver
{
///
/// Form1 的摘要说明。
///
public class screen : System.Windows.Forms.Form
{
file://加入私有成员变量
private System.ComponentModel.IContainer components;
private int iSpeed = 2;
private string str="福建南纺股份公司计算机中心";
file://定义文本字体及大小
private System.Drawing.Font TextStringFont = new System.Drawing.Font ("宋体”, 10,System.Drawing.FontStyle.Bold);
private Color TextStringcolor =System.Drawing.Color.Yellow; file://文本字体颜色
private int iDistance;
private int ixStart= 0;
private int iyStart= 0;
private int speed;
private int x1,y1;
int width1,height1;
private System.Windows.Forms.Timer timerSaver; file://计时器控件
private System.Windows.Forms.PictureBox picture1; file://图形控件
private System.Windows.Forms.Label word; file://文本显示控件
///
/// 必需的设计器变量。
///
public screen()
{
file://
// Windows 窗体设计器支持所必需的
file://
InitializeComponent();
word.Font=TextStringFont;
word.ForeColor=TextStringcolor;
System.Windows.Forms.Cursor.Hide(); file://隐藏光标
file://
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
file://
}
///
/// 清理所有正在使用的资源。
///
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
///
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
///
private void InitializeComponent() file://初始化程序中使用到的组件
{
this.components = new System.ComponentModel.Container();
System.Resources.ResourceManager resources = new system.Resources.ResourceManger(typeof(screen));
this.word = new System.Windows.Forms.Label();
this.timerSaver = new System.Windows.Forms.Timer(this.components);
this.picture1 = new System.Windows.Forms.PictureBox();
this.SuspendLayout();
//
// 设置文本显示控件(word)属性
this.word.ForeColor = System.Drawing.Color.Yellow;
this.word.Location = new System.Drawing.Point(624, 8);
this.word.Name = "word";
this.word.Size = new System.Drawing.Size(168, 16);
this.word.TabIndex = 0;
this.word.Visible = false;
//
// 设置计时器控件(timerSaver)属性
this.timerSaver.Enabled = true;
this.timerSaver.Interval = 5;
this.timerSaver.Tick += new System.EventHandler(this.timerSaver_Tick);
//
// 设置图片控件(picture1)属性
this.picture1.Image = ((System.Drawing.Bitmap)(resources.GetObject("picture1.Image")));
this.picture1.Location = new System.Drawing.Point(800, 600);
this.picture1.Name = "picture1";
this.picture1.Size = new System.Drawing.Size(304, 224);
this.picture1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage;
this.picture1.TabIndex = 1;
this.picture1.TabStop = false;
//
// 设置窗体(screen)属性
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.BackColor = System.Drawing.Color.Black;
this.ClientSize = new System.Drawing.Size(800, 600);
this.ControlBox = false;
this.Controls.AddRange(new System.Windows.Forms.Control[] {this.picture1,this.word});
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
this.KeyPreview = true;
this.MaximizeBox = false;
this.MinimizeBox = false;
this.Name = "screen";
this.ShowInTaskbar = false;
this.StartPosition = System.Windows.Forms.FormStartPosition.Manual;
this.WindowState = System.Windows.Forms.FormWindowState.Maximized;
file://键盘按下响应事件
this.KeyDown += new System.Windows.Forms.KeyEventHandler(this.screen_KeyDown);
file://鼠标按下响应事件
this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.screen_MouseDown);
file://窗体启动调用事件
this.Load += new System.EventHandler(this.Form1_Load);
file://鼠标移动响应事件
this.MouseMove += new System.Windows.Forms.MouseEventHandler(this.screen_MouseMove);
this.ResumeLayout(false);
}
#endregion
///
/// 应用程序的主入口点。
///
[STAThread]
static void Main(string[] args)
{
if(args.Length==1)
if(args[0].Substring(0,2).Equals("/c"))
{
MessageBox.Show("没有设置项功能","C# Screen Saver");
Application.Exit();
}
else if(args[0]=="/s")
Application.Run(new screen());
else if(args[0]=="/a")
{
MessageBox.Show("没有口令功能","C# Screen saver");
Application.Exit();
}
else
Application.Run(new screen());
}
private void Form1_Load(object sender, System.EventArgs e)
{
speed=0;
System.Drawing.Rectangle ssWorkArea=System.Windows.Forms.Screen.GetWorkingArea(this);
file://屏幕显示区域
width1=ssWorkArea.Width; file://屏幕宽度
height1=ssWorkArea.Height; file://屏幕高度
}
private void timerSaver_Tick(object sender, System.EventArgs e) file://计时器响应事件
{
word.Visible=true;
word.Text=str;
word.Height=word.Font.Height; file://设置文本的高度
word.Width=word.Text.Length*(int)word.Font.Size*2; file://设置文本的宽度
PlayScreenSaver();
}
private void PlayScreenSaver() file://自定义函数
{
file://下面设置文本显示框的位置坐标
word.Location =new System.Drawing.Point(width1-iDistance,word.Location.Y);
word.Visible=true; file://设置为可见
iDistance+=iSpeed;
if(word.Location.X=-(word.Width))
{
iDistance=0;
if(word.Location.Y==0)
word.Location=new System.Drawing.Point(word.Location.X,height1/2);
else if(word.Location.Y==height1/2)
word.Location=new System.Drawing.Point(word.Location.X,height1-word.Height);
else
word.Location=new System.Drawing.Point(word.Location.X,0);
}
file://下面是计算图片框移动坐标
speed++;
if(speed=2*height1)
{
x1=System.Math.Abs(width1-speed);
y1=System.Math.Abs(height1-speed);
}
else if(speed2*height1 speed=2*width1)
{
x1=System.Math.Abs(width1-speed);
y1=System.Math.Abs(height1-(speed-speed/height1*height1));
}
else if(speed2*width1 speed=3*height1)
{
x1=System.Math.Abs(width1-(speed-speed/width1*width1));
y1=System.Math.Abs(height1-(speed-speed/height1*height1));
}
else if(speed3*height1 speed4*height1)
{
x1=System.Math.Abs(width1-(speed-speed/width1*width1));
y1=System.Math.Abs(speed-speed/height1*height1);
}
else if(speed=4*height1 speed5*height1)
{
x1=System.Math.Abs(speed-speed/width1*width1);
y1=System.Math.Abs(height1-(speed-speed/height1*height1));
}
else if(speed=5*height1 speed4*width1)
{
x1=System.Math.Abs(speed-speed/width1*width1);
y1=System.Math.Abs(speed-speed/height1*height1);
}
else if(speed=4*width1 speed6*height1)
{
x1=System.Math.Abs(width1-(speed-speed/width1*width1));
y1=System.Math.Abs(speed-speed/height1*height1);
}
else if(speed=6*height1 speed5*width1)
{
x1=System.Math.Abs(width1-(speed-speed/width1*width1));
y1=System.Math.Abs(height1-(speed-speed/height1*height1));
}
else if(speed=5*width1 speed7*height1)
{
x1=System.Math.Abs(speed-speed/width1*width1);
y1=System.Math.Abs(height1-(speed-speed/height1*height1));
}
else if(speed=7*height1 speed6*width1)
{
x1=System.Math.Abs(speed-speed/width1*width1);
y1=System.Math.Abs(speed-speed/height1*height1);
}
if(speed==6*width1)
speed=0;
picture1.Location=new System.Drawing.Point(x1,y1);
}
private void StopScreenSaver() file://停止屏幕保护程序运行
{
System.Windows.Forms.Cursor.Show();
timerSaver.Enabled=false;
Application.Exit();
}
private void screen_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
file://鼠标移动事件
{
if(ixStart==0 iyStart==0)
{
ixStart=e.X;
iyStart=e.Y;
return;
}
else if(e.X!=ixStart||e.Y!=iyStart)
StopScreenSaver();
}
private void screen_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
file://鼠标按下事件
{
StopScreenSaver(); file://停止运行屏幕保护程序
}
private void screen_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
file://键盘按下事件
{
StopScreenSaver(); file://停止运行屏幕保护程序
}
}
}
最后运行该程序，把screen_saver.exe改为screen_saver.scr，拷入Windows系统目录中，这样就可以运行该屏幕
系统就有这个屏保啊!~!
Option EXPlicit
Dim quitflag As Boolean '声明终止程序标志变量
Dim lleft
'声明隐藏或显示鼠标的API函数
Private Declare Function ShowCursor Lib "user32"
(ByVal bShow As Long) As Long
'检测鼠标单击或移动
Private Sub Form_Click()
quitflag = True
End Sub
Private Sub Form_MouseMove(Button As Integer,Shift As Integer, X As Single, Y As Single)
Static xlast, ylast
Dim xnow As Single
Dim ynow As Single
xnow = X
ynow = Y
If xlast = 0 And ylast = 0 Then
xlast = xnow
ylast = ynow
Exit Sub
End If
If xnow xlast Or ynow ylast Then
quitflag = True
End If
End Sub
'检测按键
Private Sub Form_KeyDown(KeyCode As Integer,Shift As Integer)
quitflag = True
End Sub
Private Sub Form_Load()
Dim X As Long
lleft = 0
'横向滚动文字的起始X坐标
If App.PrevInstance = True Then
'用APP对象的PrevInstance属性
Unload Me
'防止同时运行屏幕保护程序的两个实例
Exit Sub
End If
Select Case Ucase$(Left$(Command$, 2))
'装载命令行参数
Case "/S" '在显示器属性对话框中单击了
预览按钮或屏幕保护程序被系统正常调用。
Show
'全屏显示Form1窗体
Randomize
'初始化随机数生成器
X = ShowCursor(False)
'隐藏鼠标
BackColor = VBBlack
Do
Timer2.Enabled = True
'启动Timer2 ,显示屏幕保护滚动文字
DoEvents
'转让控制权,以便检测鼠标和按键行为
Loop Until quitflag = True
'运行屏幕保护滚动文字直至有鼠标和按键行为
Timer2.Enabled = False
'终止滚动文字
Timer1.Enabled = True
'启动Timer1,退出屏幕保护程序
Case Else
Unload Me
Exit Sub
End Select
End Sub
Private Sub Form_Unload(Cancel As Integer)
Dim X
X = ShowCursor(True)
'显示鼠标
End Sub
Private Sub Timer1_Timer()
Unload Me
'退出屏幕保护程序
End Sub
Private Sub Timer2_Timer()
显示横向滚动文字
lleft = lleft + 100
If lleft = 11810 Then
lleft = 0
Lab1.Top = Int(Rnd * 7000)
End If
Lab1.Left = lleft
Timer2.Enabled = False
End Sub
在窗体上建立2个文本框text1和text2，一个按钮command1，text1里面输入你要转换的字符串，text2里面显示结果，代码如下：
Dim MyString As String
Dim EveryStr(50) As String
Dim TargetStr As String
Private Sub Command1_Click()
MyString = Text1
For i = 1 To Len(MyString)
EveryStr(i) = Right(Left(MyString, i), 1)
If Asc(EveryStr(i)) 123 And Asc(EveryStr(i)) 96 Then EveryStr(i) = \"_\"
If Asc(EveryStr(i)) 91 And Asc(EveryStr(i)) 64 Then EveryStr(i) = \"_\"
TargetStr = TargetStr EveryStr(i)
Next i
Text2 = TargetStr
TargetStr = \"\"
End Sub
引号前面怎么自动给加了个“\”？用的时候请手动把那几个“\”去掉
如果你想开发商业软件还是别用.net了，速度慢，易被反汇编，目标机器也需要安装对应版本的.net架构，这几条就给程序判了死刑
保护VB.NET代码不被修改,最简单的就是 编译。
对外仅提供编译后的应用程序（库），别人就不能修改了。