請(qǐng)教，vb.net寫(xiě)入文件問(wèn)題，為什么我用兩種辦法寫(xiě)文件只能寫(xiě)入最后一行

寫(xiě)入模式為覆蓋會(huì)出現(xiàn)這個(gè)現(xiàn)象

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要使用添加模式

就會(huì)累加了

vb.net中，讀取和寫(xiě)入文件

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

sr.WriteLine("寫(xiě)入的內(nèi)容") sr.Close()讀取：If (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(xiě)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(xiě)入內(nèi)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(nèi)存編輯器/summary

''' param name="processHwnd"進(jìn)程句柄/param

Sub New(processHwnd As IntPtr)

Me.phwnd = processHwnd

End Sub

''' summary根據(jù)指定偏移量讀取內(nèi)存基址/summary

''' param name="addr"內(nèi)存地址/param

''' param name="offsets"偏移量數(shù)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(nèi)存偏移量[" Hex(offset) "]錯(cuò)誤！"

Throw New Exception(errInfo)

End If

Next

Return address

End Function

''' summary讀取4字節(jié)內(nèi)存數(shù)值/summary

''' param name="addr"內(nèi)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(nèi)存數(shù)組/summary

''' param name="addr"內(nèi)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(nèi)存值數(shù)組寫(xiě)入指定地址/summary

''' param name="addr"內(nèi)存地址/param

''' param name="buffer"內(nèi)存值數(shù)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(nèi)存讀寫(xiě)代碼有問(wèn)題！用上面的代碼試試，我以前寫(xiě)的；

調(diào)用方法：

Dim mem As New MemoryEditor(進(jìn)程句柄)

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

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

Dim value As Integer = mem.ReadMemoryToInteger(baseaddr)

vb.net 寫(xiě)入mdb數(shù)據(jù)庫(kù)

1、首先，你得做一個(gè)oledbconnection對(duì)象，這個(gè)對(duì)象有個(gè)連接字符串的屬性，你需要設(shè)置

2、做一個(gè)oledbcommand對(duì)象，這個(gè)對(duì)象有個(gè)操作字符串（SQL語(yǔ)句）需要設(shè)置

3、打開(kāi)oledbconnection對(duì)象

4、執(zhí)行oledbcommand對(duì)象

5、關(guān)閉oledbconnection對(duì)象

程序結(jié)束，希望對(duì)你有幫助

vb.net 怎么寫(xiě)入數(shù)據(jù)庫(kù)數(shù)據(jù)

使用.net下的system.sql.sqlclint類(lèi)庫(kù)下的sqlconnent;sqlcommand類(lèi)進(jìn)行寫(xiě)入操作

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