請教，vb.net寫入文件問題，為什么我用兩種辦法寫文件只能寫入最后一行

寫入模式為覆蓋會出現這個現象

創(chuàng)新互聯(lián)公司-專業(yè)網站定制、快速模板網站建設、高性價比饒陽網站開發(fā)、企業(yè)建站全套包干低至880元,成熟完善的模板庫,直接使用。一站式饒陽網站制作公司更省心,省錢,快速模板網站建設找我們，業(yè)務覆蓋饒陽地區(qū)。費用合理售后完善，10年實體公司更值得信賴。

要使用添加模式

就會累加了

vb.net中，讀取和寫入文件

寫入：Dim sr As New IO.StreamWriter(Application.StartupPath "/寫入的文本.txt")

sr.WriteLine("寫入的內容") sr.Close()讀?。篒f (File.Exists(Application.StartupPath "/msg.txt")) Then

Dim fm As New IO.FileStream(Application.StartupPath "/讀取的文本.txt", FileMode.Open)

Dim sr As IO.StreamReader = New IO.StreamReader(fm)

Do While sr.Peek() = 0

TextBox1.Text = sr.ReadLine() （讀取文本到文本框）

Loop end if

vb.net XML文件如何寫入

Imports System.IO

Public Class Form1

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

Dim f As New FileInfo("d:\doc.xml")

If f.Exists = False Then

f.Create()

f.Refresh()

End If

Dim s As String = ""

Dim sw As StreamWriter = f.CreateText()

s = "?xml version=""1.0"" encoding=""GB2312""?"

sw.WriteLine(s)

sw.WriteLine("doc")

sw.WriteLine(" assembly")

sw.WriteLine("userId34/userId")

sw.WriteLine("userName張三/userName")

sw.WriteLine("qxbz1/qxbz")

sw.WriteLine(" /assembly")

sw.WriteLine("/doc")

sw.Flush()

sw.Close()

Process.Start("d:\doc.xml")

End Sub

End Class

vb.net 寫入內存值不正確

Imports System.Runtime.InteropServices

Public Class MemoryEditor

Inherits WINAPI.NativeMethods

Private phwnd As IntPtr

Private Buffer As Byte()

Private BytesRead As IntPtr

Private BytesWrite As IntPtr

''' summary創(chuàng)建內存編輯器/summary

''' param name="processHwnd"進程句柄/param

Sub New(processHwnd As IntPtr)

Me.phwnd = processHwnd

End Sub

''' summary根據指定偏移量讀取內存基址/summary

''' param name="addr"內存地址/param

''' param name="offsets"偏移量數組/param

Public Function ReadBaseAddress(addr As IntPtr, offsets() As Integer) As IntPtr

Dim address As IntPtr = ReadMemoryToInteger(addr)

For Each offset As Integer In offsets

address = address.ToInt32 + offset

address = ReadMemoryToInteger(address)

If address = IntPtr.Zero Then

Dim errInfo As String = "內存偏移量[" Hex(offset) "]錯誤！"

Throw New Exception(errInfo)

End If

Next

Return address

End Function

''' summary讀取4字節(jié)內存數值/summary

''' param name="addr"內存地址/param

Public Function ReadMemoryToInteger(addr As IntPtr) As Integer

Buffer = New Byte(3) {}

ReadProcessMemory(phwnd, addr, Buffer, 4, BytesRead)

Return BitConverter.ToInt32(Buffer, 0)

End Function

''' summary讀取4字節(jié)內存數組/summary

''' param name="addr"內存地址/param

Public Function ReadMemoryToBytes(addr As IntPtr) As Byte()

Buffer = New Byte(3) {}

ReadProcessMemory(phwnd, addr, Buffer, 4, BytesRead)

Return Buffer

End Function

''' summary將內存值數組寫入指定地址/summary

''' param name="addr"內存地址/param

''' param name="buffer"內存值數組/param

Public Function WriteMemoryByBytes(addr As IntPtr, buffer As Byte()) As Boolean

Return WriteProcessMemory(phwnd, addr, buffer, buffer.Length, BytesWrite)

End Function

End Class

Namespace WINAPI

Public MustInherit Class NativeMethods

DllImport("kernel32.dll", SetLastError:=True) _

Public Shared Function ReadProcessMemory(ByVal hProcess As IntPtr, _

ByVal lpBaseAddress As IntPtr, _

Out() ByVal lpBuffer() As Byte, _

ByVal dwSize As Integer, _

ByRef lpBytesRead As Integer) As Boolean

End Function

DllImport("kernel32.dll", SetLastError:=True) _

Public Shared Function WriteProcessMemory(ByVal hProcess As IntPtr, _

ByVal lpBaseAddress As IntPtr, _

ByVal lpBuffer As Byte(), _

ByVal nSize As Integer, _

Out() ByRef lpBytesWritten As IntPtr) As Boolean

End Function

End Class

End Namespace

是不是內存讀寫代碼有問題！用上面的代碼試試，我以前寫的；

調用方法：

Dim mem As New MemoryEditor(進程句柄)

Dim offsets As Integer() = {H1, H2, H3} '{一級基址，二級基址，三級基址}

Dim baseaddr As IntPtr = mem.ReadBaseAddress(內存地址, offsets)

Dim value As Integer = mem.ReadMemoryToInteger(baseaddr)

vb.net 寫入mdb數據庫

1、首先，你得做一個oledbconnection對象，這個對象有個連接字符串的屬性，你需要設置

2、做一個oledbcommand對象，這個對象有個操作字符串（SQL語句）需要設置

3、打開oledbconnection對象

4、執(zhí)行oledbcommand對象

5、關閉oledbconnection對象

程序結束，希望對你有幫助

vb.net 怎么寫入數據庫數據

使用.net下的system.sql.sqlclint類庫下的sqlconnent;sqlcommand類進行寫入操作

網站名稱：vb.net寫入,VBNET是干嘛的
瀏覽地址：http://vcdvsql.cn/article16/dsiejdg.html

成都網站建設公司_創(chuàng)新互聯(lián)，為您提供自適應網站、靜態(tài)網站、域名注冊、網站改版、定制網站、響應式網站

廣告

聲明：本網站發(fā)布的內容（圖片、視頻和文字）以用戶投稿、用戶轉載內容為主，如果涉及侵權請盡快告知，我們將會在第一時間刪除。文章觀點不代表本網站立場，如需處理請聯(lián)系客服。電話：028-86922220；郵箱：631063699@qq.com。內容未經允許不得轉載，或轉載時需注明來源： 創(chuàng)新互聯(lián)