vb.net怎么编程实现从音频输出口输出指定频率指定时长和占空比的单音信号。

1.用Win32 API PlaySound

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PlaySound位于"winmm.dll"中，可以根据输入参数的不同，播放WAV类型的音乐。在VB.NET中调用跟VB6中差不多：

先声明：

Private Declare Auto Function PlaySound Lib "winmm.dll" (ByVal lpszSoundName As String, ByVal hModule As Integer, ByVal dwFlags As Integer) As Integer

Const SND_FILENAME As Integer = H20000

Const SND_ALIAS As Integer = H10000

Const SND_SYNC As Integer = H0

具体还有很多常量，不一一列举，下面是播放一个wav文件的例子

Dim mstrfileName As String = "c:\eagle2.wav"

PlaySound(mstrfileName, 0, SND_FILENAME)

注意上面的播放是非同步的，就是说它并不会播放完毕才结束。如果把上面的代码写在一个Button.Click的事件处理程序中，第二次点击的时候它会打断第一次的播放，重新开始。

当然我们也可以调用系统的声音：

PlaySound("SystemStart", 0, SND_ALIAS Or SND_SYNC)

' 以同步的方式调用系统启动时候的声音。

2． 调用媒体播放器控件

VB.NET中并没有提供媒体播放器的.NET组件，没办法我们还是调用以前Com组件Windows Media Player。当然除了声音外，还可以播放视频文件。

首先把媒体播放器控件加到工具栏中，调用还是简单的写一下吧：）

Private Sub playMediaFile(ByVal mediaFileName As String)

With MediaPlayer1

.Stop()

.FileName = "c:\mp3\爱不爱我.mp3"

.Play()

End With

End Sub

vb.net编写的贪吃蛇游戏，带代码的

需用VB实现，代码如下

'定义蛇的运动速度枚举值

Private Enum tpsSpeed

QUICKLY = 0

SLOWLY = 1

End Enum

'定义蛇的运动方向枚举值

Private Enum tpsDirection

D_UP = 38

D_DOWN = 40

D_LEFT = 37

D_RIGHT = 39

End Enum

'定义运动区域4个禁区的枚举值

Private Enum tpsForbiddenZone

FZ_TOP = 30

FZ_BOTTOM = 5330

FZ_LEFT = 30

FZ_RIGHT = 5730

End Enum

'定义蛇头及身体初始化数枚举值

Private Enum tpsSnake

SNAKEONE = 1

SNAKETWO = 2

SNAKETHREE = 3

SNAKEFOUR = 4

End Enum

'定义蛇宽度的常量

Private Const SNAKEWIDTH As Integer = 100

'该过程用于显示游戏信息

Private Sub Form_Load()

Me.Show

Me.lblTitle = "BS贪食蛇 — (版本 " App.Major "." App.Minor "." App.Revision ")"

Me.Caption = Me.lblTitle.Caption

frmSplash.Show 1

End Sub

'该过程用于使窗体恢复原始大小

Private Sub Form_Resize()

If Me.WindowState 1 Then

Me.Caption = ""

Me.Height = 6405 '窗体高度为 6405 缇

Me.Width = 8535 '窗体宽度为 8535 缇

Me.Left = (Screen.Width - Width) \ 2

Me.Top = (Screen.Height - Height) \ 2

End If

End Sub

'该过程用于重新开始开始游戏

Private Sub cmdGameStart_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)

Beep

msg = MsgBox("您确认要重新开始游戏吗？", 4 + 32, "BS贪食蛇")

If msg = 6 Then Call m_subGameInitialize

End Sub

'该过程用于暂停/运行游戏

Private Sub chkPause_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)

If Me.chkPause.Caption = "暂停游戏(P)" Then

Me.tmrSnakeMove.Enabled = False

Me.tmrGameTime.Enabled = False

Me.picMoveArea.Enabled = False

Me.lblPauseLab.Visible = True

Me.chkPause.Caption = "继续游戏(R)"

Else

Me.tmrSnakeMove.Enabled = True

Me.tmrGameTime.Enabled = True

Me.picMoveArea.Enabled = True

Me.lblPauseLab.Visible = False

Me.chkPause.Caption = "暂停游戏(P)"

End If

End Sub

'该过程用于显示游戏规则

Private Sub cmdGameRules_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)

Beep

MsgBox " BS贪食蛇：一个规则最简单的趣味游戏，您将用键盘" Chr(13) _

"上的4个方向键来控制蛇的运动方向。在运动过程中蛇" Chr(13) _

"不能后退，蛇的头部也不能接触到运动区域的边线以外" Chr(13) _

"和蛇自己的身体，否则就游戏失败。在吃掉随机出现的" Chr(13) _

"果子后，蛇的身体会变长，越长难度越大。祝您好运！！", 0 + 64, "游戏规则"

End Sub

'该过程用于显示游戏开发信息

Private Sub cmdAbout_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)

Beep

MsgBox "BS贪食蛇" "(V-" App.Major "." App.Minor "版本)" Chr(13) Chr(13) _

"" Chr(13) Chr(13) _

"由PigheadPrince设计制作" Chr(13) _

"CopyRight(C)2002,BestSoft.TCG", 0, "关于本游戏"

End Sub

'该过程用于退出游戏

Private Sub cmdExit_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)

Beep

msg = MsgBox("您要退出本游戏吗？", 4 + 32, "BS贪食蛇")

Select Case msg

Case 6

End

Case 7

Me.chkWindowButton(2).Value = 0

Exit Sub

End Select

End Sub

'该过程用于拖动窗体_(点击图标)

Private Sub imgWindowTop_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)

ReleaseCapture

SendMessage Me.hwnd, WM_SYSCOMMAND, SC_MOVE, 0

End Sub

'该共用过程用于处理窗体控制按钮组的相关操作_(锁定、最小化、退出)

Private Sub chkWindowButton_MouseUp(Index As Integer, Button As Integer, Shift As Integer, X As Single, Y As Single)

If Button 1 Then Exit Sub

Select Case Index

Case 0 '锁定窗体

If Me.chkWindowButton(0).Value = 1 Then

Me.imgWindowTop.BorderStyle = 0

Me.imgWindowTop.Enabled = False

Else

Me.imgWindowTop.BorderStyle = 1

Me.imgWindowTop.Enabled = True

End If

Case 1 '最小化

Me.WindowState = 1

Me.chkWindowButton(1).Value = 0

Me.Caption = "BS贪食蛇 — (V-" App.Major "." App.Minor "版本)"

Case 2 '退出

Beep

msg = MsgBox("您要退出本游戏吗？", 4 + 32, "BS贪食蛇")

Select Case msg

Case 6

End

Case 7

Me.chkWindowButton(2).Value = 0

Exit Sub

End Select

End Select

End Sub

'该过程用于设置蛇运动速度的快慢

Private Sub hsbGameSpeed_Change()

Me.tmrSnakeMove.Interval = Me.hsbGameSpeed.Value

End Sub

'该过程用于通过键盘的方向键改变蛇的运动方向

Private Sub picMoveArea_KeyDown(KeyCode As Integer, Shift As Integer)

Select Case g_intDirection

Case D_UP

If KeyCode = D_DOWN Then Exit Sub

Case D_DOWN

If KeyCode = D_UP Then Exit Sub

Case D_LEFT

If KeyCode = D_RIGHT Then Exit Sub

Case D_RIGHT

If KeyCode = D_LEFT Then Exit Sub

End Select

g_intDirection = KeyCode

End Sub

'该计时循环过程用于计算游戏耗费的秒数并显示

Private Sub tmrGameTime_Timer()

g_lngGameTime = g_lngGameTime + 1

Me.lblGameTime.Caption = g_lngGameTime "秒"

End Sub

'该计时循环过程用于控制蛇的行动轨迹

Private Sub tmrSnakeMove_Timer()

Dim lngSnakeX As Long, lngSnakeY As Long, lngSnakeColor As Long

Dim lngPointX As Long, lngPointY As Long, lngPointColor As Long

Randomize

Me.picMoveArea.SetFocus

Me.picMoveArea.Cls

'确认蛇头的运动方向并获取新的位置

Select Case g_intDirection

Case D_UP '向上运动

g_udtSnake(SNAKEONE).Snake_CurX = g_udtSnake(SNAKEONE).Snake_OldX

g_udtSnake(SNAKEONE).Snake_CurY = g_udtSnake(SNAKEONE).Snake_OldY

g_udtSnake(SNAKEONE).Snake_CurY = g_udtSnake(SNAKEONE).Snake_CurY - SNAKEWIDTH

Case D_DOWN '向下运动

g_udtSnake(SNAKEONE).Snake_CurX = g_udtSnake(SNAKEONE).Snake_OldX

g_udtSnake(SNAKEONE).Snake_CurY = g_udtSnake(SNAKEONE).Snake_OldY

g_udtSnake(SNAKEONE).Snake_CurY = g_udtSnake(SNAKEONE).Snake_CurY + SNAKEWIDTH

Case D_LEFT '向左运动

g_udtSnake(SNAKEONE).Snake_CurX = g_udtSnake(SNAKEONE).Snake_OldX

g_udtSnake(SNAKEONE).Snake_CurX = g_udtSnake(SNAKEONE).Snake_CurX - SNAKEWIDTH

g_udtSnake(SNAKEONE).Snake_CurY = g_udtSnake(SNAKEONE).Snake_OldY

Case D_RIGHT '向右运动

g_udtSnake(SNAKEONE).Snake_CurX = g_udtSnake(SNAKEONE).Snake_OldX

g_udtSnake(SNAKEONE).Snake_CurX = g_udtSnake(SNAKEONE).Snake_CurX + SNAKEWIDTH

g_udtSnake(SNAKEONE).Snake_CurY = g_udtSnake(SNAKEONE).Snake_OldY

End Select

'根据新的位置绘制蛇头

lngSnakeX = g_udtSnake(SNAKEONE).Snake_CurX

lngSnakeY = g_udtSnake(SNAKEONE).Snake_CurY

lngSnakeColor = g_udtSnake(SNAKEONE).Snake_Color

Me.picMoveArea.PSet (lngSnakeX, lngSnakeY), lngSnakeColor

'移动蛇身体其他部分的位置

For i = 2 To g_intSnakeLength

g_udtSnake(i).Snake_CurX = g_udtSnake(i - 1).Snake_OldX

g_udtSnake(i).Snake_CurY = g_udtSnake(i - 1).Snake_OldY

lngSnakeX = g_udtSnake(i).Snake_CurX

lngSnakeY = g_udtSnake(i).Snake_CurY

lngSnakeColor = g_udtSnake(i).Snake_Color

Me.picMoveArea.PSet (lngSnakeX, lngSnakeY), lngSnakeColor

Next i

'更新蛇旧的坐标位置

For j = 1 To g_intSnakeLength

g_udtSnake(j).Snake_OldX = g_udtSnake(j).Snake_CurX

g_udtSnake(j).Snake_OldY = g_udtSnake(j).Snake_CurY

Next j

'判断蛇在移动中是否到了禁区而导致游戏失败

If m_funMoveForbiddenZone(g_udtSnake(SNAKEONE).Snake_CurX, g_udtSnake(SNAKEONE).Snake_CurY) Then

Beep

MsgBox "您的蛇移动到了禁区，游戏失败！", 0 + 16, "BS贪食蛇"

Me.tmrSnakeMove.Enabled = False

Me.tmrGameTime.Enabled = False

Me.picMoveArea.Visible = False

Exit Sub

End If

'判断蛇在移动中是否碰到了自己的身体而导致游戏失败

If m_funTouchSnakeBody(g_udtSnake(SNAKEONE).Snake_CurX, g_udtSnake(SNAKEONE).Snake_CurY) Then

Beep

MsgBox "您的蛇在移动中碰到了自己的身体，游戏失败！", 0 + 16, "BS贪食蛇"

Me.tmrSnakeMove.Enabled = False

Me.tmrGameTime.Enabled = False

Me.picMoveArea.Visible = False

Exit Sub

End If

'判断蛇是否吃到了果子

If m_funEatPoint(g_udtSnake(SNAKEONE).Snake_CurX, g_udtSnake(SNAKEONE).Snake_CurY) Then

'累加玩家的得分并刷新得分显示

g_intPlayerScore = g_intPlayerScore + 1

Me.lblYourScore.Caption = g_intPlayerScore "分"

Call m_subAddSnake '加长蛇的身体

Call m_subGetPoint '获取下一个果子的位置和颜色

Else

'绘制果子

lngPointX = g_udtPoint.Point_X

lngPointY = g_udtPoint.Point_Y

lngPointColor = g_udtPoint.Point_Color

Me.picMoveArea.PSet (lngPointX, lngPointY), lngPointColor

End If

End Sub

'该私有子过程用于初始化游戏

Private Sub m_subGameInitialize()

Erase g_udtSnake '清空蛇的结构数组

g_intPlayerScore = 0 '清空玩家的得分

g_lngGameTime = 0 '清空游戏耗费的秒数

g_intDirection = D_DOWN '设定蛇的初始运动方向为下

g_intSnakeLength = 4 '设定蛇的初始长度

ReDim g_udtSnake(1 To g_intSnakeLength) '重新定义蛇的长度

'定义蛇头部的数据

With g_udtSnake(SNAKEONE)

.Snake_OldX = 530

.Snake_OldY = 530

.Snake_Color = vbBlack

End With

'定义蛇身第2节的数据

With g_udtSnake(SNAKETWO)

.Snake_OldX = 530

.Snake_OldY = 430

.Snake_Color = vbGreen

End With

'定义蛇身第3节的数据

With g_udtSnake(SNAKETHREE)

.Snake_OldX = 530

.Snake_OldY = 330

.Snake_Color = vbYellow

End With

'定义蛇身第4节的数据

With g_udtSnake(SNAKEFOUR)

.Snake_OldX = 530

.Snake_OldY = 230

.Snake_Color = vbRed

End With

Me.picMoveArea.Visible = True

Me.lblYourScore.Caption = g_intPlayerScore "分"

Me.lblGameTime.Caption = g_lngGameTime "秒"

Me.tmrSnakeMove.Interval = Me.hsbGameSpeed.Value

Me.tmrSnakeMove.Enabled = True

Me.tmrGameTime.Enabled = True

Call m_subGetPoint '获取第一个果子的位置和颜色

End Sub

我在VB.net程序中加了Beep没有用！

用Console.Beep(int,int)这个方法就可以了。

另外，建议把提示出错的代码直接放入Catch中，提示鸣放的代码放入Try中。

vb.net中，如何使textbox禁止输入/,*,?,（也就是文件名命名规则里限制的那几个

这个应该可以，已经通过VB2010测试：

Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged

If TextBox1.Text "" Then

If Microsoft.VisualBasic.Right(TextBox1.Text, 1) = "/" Or Microsoft.VisualBasic.Right(TextBox1.Text, 1) = "*" Or _

Microsoft.VisualBasic.Right(TextBox1.Text, 1) = "?" Or Microsoft.VisualBasic.Right(TextBox1.Text, 1) = "" Or _

Microsoft.VisualBasic.Right(TextBox1.Text, 1) = "" Then

TextBox1.Text = Microsoft.VisualBasic.Left(TextBox1.Text, Len(TextBox1.Text) - 1)

TextBox1.SelectionStart = Len(TextBox1.Text)

End If

End If

End Sub

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