VB.net 儲存文字檔案

 

儲存文字檔

VB代码

需要引用 system 和 system.IO

方法1: 利用 StreamWriter 写入文档，值得注意的是，要确定要保存的文件夹已经创建，不然会报错。

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Dim sw As StreamWriter = New StreamWriter("C:\temp\test.txt")         sw.Write("This is Test Text")         sw.Close()

方法2: 利用 My.Computer.FileSystem.WriteAllText 写入文档

1	My.Computer.FileSystem.WriteAllText("C:\temp\test.txt", "This is test Text")

方法3: 利用 System.IO.File.WriteAllText 写入文档

1	System.IO.File.WriteAllText("c:\temp\test.txt", "this is test file")

VB 代码

方法1：

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Dim sw As StreamWriter = New StreamWriter("C:\temp\test.txt")         sw.Write("abc" & vbCrLf)         sw.Close()         Dim sw2 As StreamWriter = New StreamWriter("C:\temp\test.txt", True)         sw2.Write("456" & vbCrLf)         sw2.Close()

方法2：

1	My.Computer.FileSystem.WriteAllText("test.txt", "This is test Text", True)

方法3：

1	System.IO.File.AppendAllText("c:\temp\test.txt", "this is extra test file")

VB 代码

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Dim sw As StreamWriter = New StreamWriter("C:\temp\test.txt")         Dim strTemp As String = Me.RichTextBox1.Text         strTemp = strTemp.Replace(vbLf, vbCrLf)         sw.Write(strTemp)         sw.Close()

VB代码

1	RichTextBox1.SaveFile("test.txt", RichTextBoxStreamType.PlainText)

MsgBox (message box) 對話視窗

一個msgbox圖片範例:

有時候會看到八~

讓我們一起來做做看八

如果你只是要做簡單的顯示字串的話:

MsgBox("你要顯示的字串")

圖片範例:

如果你想要做出可以更改圖示及回復按鈕的msgbox的話:

MsgBox("你要顯示的字串", 回復按鈕 + 圖示)

MsgBox("你要顯示的字串", 0 + 64)

圖示的代碼列表:

按鈕代碼列表:

如果你要更改msgbox的標題的話:

MsgBox("你要顯示的字串", 回復按鈕 + 圖示,"標題")

範例:MsgBox("你要顯示的字串", 0 + 64,"標題")

如果你要設定msgbox的傳回值得話:

就需要用到If Then了

而他需要判斷按鈕，所以在這邊列了一張圖片

範例:

X = MsgBox("你有女朋友嗎", 4 + 32, "小知")

        If X = 6 Then

            MsgBox("好好喔", 0 + 64, "小知")

        Else

            MsgBox("加油!", 0 + 64, "小知")

        End If

範例圖片:

選是的話:

選否的話

資料來源

https://forum.gamer.com.tw/Co.php?bsn=60030&sn=1605224

電腦發音、音效、音樂

Public Class Form1
    Declare Function Beep Lib "kernel32" (ByVal dwFreq As Integer, ByVal dwDuration As Integer) As Integer

註:將beep改成Console.Beep就不用上面這一Declare Function Beep......

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        '救護車聲
        Dim myAlert As New Threading.Thread(AddressOf Alert)
        Dim I As Short
        For I = 0 To 10
            Beep(1000, 500)
            Beep(2000, 1000)
        Next
    End Sub
  
    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        '炸彈掉下聲
        Dim I As Short
        For I = 2500 To 750 Step -10
            Beep(I, 50)
        Next
    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        '生日快樂
        Dim i() As Integer = {392, 392, 440, 392, 523, 494, 392, 392, 440, 392, 587, 523, 392, 392, 784, 659, 523, 494, 440, 698, 698, 659, 523, 587, 523}
        Dim j() As Integer = {375, 125, 500, 500, 500, 1000, 375, 125, 500, 500, 500, 1000, 375, 125, 500, 500, 500, 500, 1000, 375, 125, 500, 500, 500, 1000}
        Dim ak As Integer
        For ak = 0 To i.Length - 1
            Beep(i(ak), j(ak))
        Next
    End Sub

    Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
        '警報聲
        Dim I As Short
        For I = 0 To 20

            Beep(75, 200)
            Beep(400, 200)
        Next
    End Sub

    Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
        '單聲
        Console.Beep()
    End Sub

    Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click
        Dim myAlert As New Threading.Thread(AddressOf Alert)
        myAlert.Start()
    End Sub
    Sub Alert()
        Dim I As Short
        For I = 2500 To 750 Step -10
            Beep(I, 50)
            'Beep(I, 100)
        Next
    End Sub
End Class
-------------------------------------------------------------------------------------------------------------

●MSDN的描述：The Beep function generates simple tones on the speaker. The function is synchronous; it does not return control to its caller until the sound finishes.
●小站已測試平台：Windows9x、Windows NT4、Windows 2000、Windows XP
●建議宣告法： 'VB6
Declare Function Beep Lib "kernel32" (ByVal dwFreq As Long, ByVal dwDuration As Long) As Long
--------------------------------------------------------------------------------
 'VB.Net宣告
Declare Function Beep Lib "kernel32" (ByVal dwFreq As Integer, ByVal dwDuration As Integer) As Integer 

●用法範 例：

●VB6警車聲
Private Sub Form_Activate()
    For I = 0 To 10
        Beep 75, 200
        Beep 400, 200
        DoEvents
    Next
End Sub 
●VB.Net警車聲
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    Dim myAlert As New Threading.Thread(AddressOf Alert)
    myAlert.Start()
End Sub
Sub Alert()
    Dim I As Short
    For I = 0 To 10
        Beep(75, 200)
        Beep(400, 200)
    Next
End Sub 

●VB6卡通墜落聲
Private Sub Form_Activate()
    For I = 2500 To 750 Step -10
        Beep I, 50
        DoEvents
    Next
End Sub 
●VB.Net警車聲
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    Dim myAlert As New Threading.Thread(AddressOf Alert)
    myAlert.Start()
End Sub
Sub Alert()
    Dim I As Short
    For I = 2500 To 750 Step -10
        Beep(I, 50)
    Next
End Sub 

●dwFreq→頻率(Hz)
●dwDuration→播放時間(千分之一秒)

不會當掉的VB.net Delay (Sleep)

Public Sub delay(ByVal TimeLast) Dim Start As Integer = Environment.TickCount() 'Dim TimeLast As Integer = 7000 ' 要延遲 t 秒,就設為 t *1000 Do If Environment.TickCount() - Start > TimeLast Then Exit Do Application.DoEvents() ' 要記得寫這行，不然都在跑迴圈，畫面可能會不見 Loop End Sub

VB6 等待 做其他事 釋放資源 delay

請你使用timer元件,配合下列副函數,如"wait 5"就是等待5秒
Private Sub Wait(iSec As Long)
Dim iTimer As Long

    iTimer = Timer
    Do Until Timer - iTimer >= iSec
     DoEvents
    Loop
End Sub

文字檔開啟

一、直接使用File opentext的方式

Dim sr As StreamReader = File.OpenText("utf.txt")

二、使用FileInfo的方法
Dim file1 As FileInfo = New FileInfo("b12.txt")
Dim sr As StreamReader = file1.OpenText()

三、使用 File 的 OpenText 或 FileInfo 的 OpenText 預設都以 UTF-8 編碼方式開啟檔案，若遇上文字檔本身並非UTF存檔，會有亂碼產生。若需指定編碼開啟，需使用如下：
Dim sr As StreamReader = My.Computer.FileSystem.OpenTextFileReader("b12.txt", System.Text.Encoding.Default)

Default: 是使用文預設的編碼方式開啟

http://blog.xuite.net/sungnoone/it/13041979-vb.net%E6%96%87%E5%AD%97%E6%AA%94%E9%96%8B%E5%95%9F%E6%96%B9%E5%BC%8F

判斷路徑資料夾是否存在及建立資料夾

VB.NET
判別路徑資料夾是否存在：
 If Not IO.Directory.Exists("Path+資料夾名稱") Then

            '如不存在，建立資料夾
            IO.Directory.CreateDirectory("Path+資料夾名稱")
 End If


判別路徑檔案是否存在：
 System.IO.File.Exists("Path+FileName")

http://programlanguagebymingze.blogspot.tw/2012/10/vbnet.html