vb.net写入,VBNET是干嘛的

请教，vb.net写入文件问题，为什么我用两种办法写文件只能写入最后一行

写入模式为覆盖会出现这个现象

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要使用添加模式

就会累加了

vb.net中，读取和写入文件

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

sr.WriteLine("写入的内容") sr.Close()读取：If (File.Exists(Application.StartupPath "/msg.txt")) Then

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

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

Do While sr.Peek() = 0

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

Loop end if

vb.net XML文件如何写入

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张三/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 写入内存值不正确

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创建内存编辑器/summary

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

Sub New(processHwnd As IntPtr)

Me.phwnd = processHwnd

End Sub

''' summary根据指定偏移量读取内存基址/summary

''' param name="addr"内存地址/param

''' param name="offsets"偏移量数组/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 = "内存偏移量[" Hex(offset) "]错误！"

Throw New Exception(errInfo)

End If

Next

Return address

End Function

''' summary读取4字节内存数值/summary

''' param name="addr"内存地址/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读取4字节内存数组/summary

''' param name="addr"内存地址/param

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

Buffer = New Byte(3) {}

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

Return Buffer

End Function

''' summary将内存值数组写入指定地址/summary

''' param name="addr"内存地址/param

''' param name="buffer"内存值数组/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

是不是内存读写代码有问题！用上面的代码试试，我以前写的；

调用方法：

Dim mem As New MemoryEditor(进程句柄)

Dim offsets As Integer() = {H1, H2, H3} '{一级基址，二级基址，三级基址}

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

Dim value As Integer = mem.ReadMemoryToInteger(baseaddr)

vb.net 写入mdb数据库

1、首先，你得做一个oledbconnection对象，这个对象有个连接字符串的属性，你需要设置

2、做一个oledbcommand对象，这个对象有个操作字符串（SQL语句）需要设置

3、打开oledbconnection对象

4、执行oledbcommand对象

5、关闭oledbconnection对象

程序结束，希望对你有帮助

vb.net 怎么写入数据库数据

使用.net下的system.sql.sqlclint类库下的sqlconnent;sqlcommand类进行写入操作