vb.net读取屏幕保护 vbnet读取文本

用vb,net怎么做屏幕保护程序啊

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

如何用VB.NET写一个简单的屏幕保护程序？

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

vb.net 屏幕保护程序

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