vb.net(2008)把图片(或其它类型文件)转换成字符串存入.txt文件中，并从.txt中读出生成图片

这个做法应该是图方便的加密解密做法。按你的C#代码来改的话是这样的。

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'Imports System.IO

Public Function MapPath(ByVal virtualPath As String) As String

' Return System.Web.Hosting.MapPath(virtualPath)

' 猜想是这个 MapPath 函数

' 如果不是那就自己还原原来C#代码里的那个MapPath

End Function

Public Sub GetImage()

Dim s As System.IO.Stream = System.IO.File.Open(MapPath("33.jpg"), System.IO.FileMode.Open)

Dim leng As Integer = 0

If s.Length Int32.MaxValue Then

leng = s.Length

End If

Dim by(leng) As Byte

s.Read(by, 0, leng) ' 把图片读到字节数组中

s.Close()

Dim str As String = Convert.ToBase64String(by) ' 把字节数组转换成字符串

Dim sw As System.IO.StreamWriter = System.IO.File.CreateText(MapPath("11.txt")) ' 存入11.txt文件

sw.Write(str)

sw.Close()

sw.Dispose()

End Sub

' 把字符串还原成图片

Public Sub CreateImg()

Dim sr As New System.IO.StreamReader(MapPath("11.txt"))

Dim s As String = sr.ReadToEnd()

sr.Close()

Dim buf As Byte() = Convert.FromBase64String(s) ' 把字符串读到字节数组中

Dim ms As New System.IO.MemoryStream(buf)

Dim img As System.Drawing.Image = System.Drawing.Image.FromStream(ms)

img.Save(MapPath("12.jpg"), System.Drawing.Imaging.ImageFormat.Jpeg)

ms.Close()

ms.Dispose()

End Sub

vb.net 图片转换二进制代码

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim MyStream As New System.IO.MemoryStream

Me.PictureBox1.Image.Save(MyStream, System.Drawing.Imaging.ImageFormat.Jpeg)

Dim MyBytes(MyStream.Length) As Byte

MyStream.Read(MyBytes, 0, MyStream.Length)

MyStream.Close()

Dim strText As String

strText = BitConverter.ToString(MyBytes)

Me.TextBox1.Text = strText

End Sub

图片转成base64编码，VB和C#是否有区别

这里的vb指vb6还是vb.net，你是问语法还是转码后的图片

vb.net和c#都会预编译程clr文件，双击exe执行的其实是clr，没有任何区别

vb.net 如何将编码GB2312转成UTF8

Imports System.Text

Public Function StringAsUtf8Bytes(ByVal strData As String) As Byte()

Dim bytes() As Byte

bytes = Encoding.UTF8.GetBytes(strData)

Return bytes

End Function

说明：strData参数是GB2312字符串，函数返回UTF8字节数组

vb.net如何将图片转二进制

'容易，用api，查一查SetBitmapBits

'新建工程，增加一个 command button ， 一个 picture box , 将图片加载到 picture box.

'将代码粘贴到 Form1

Private Type BITMAP

bmType As Long

bmWidth As Long

bmHeight As Long

bmWidthBytes As Long

bmPlanes As Integer

bmBitsPixel As Integer

bmBits As Long

End Type

Private Declare Function GetObject Lib "gdi32" Alias "GetObjectA" (ByVal hObject As Long, ByVal nCount As Long, lpObject As Any) As Long

Private Declare Function GetBitmapBits Lib "gdi32" (ByVal hBitmap As Long, ByVal dwCount As Long, lpBits As Any) As Long

Private Declare Function SetBitmapBits Lib "gdi32" (ByVal hBitmap As Long, ByVal dwCount As Long, lpBits As Any) As Long

Dim PicBits() As Byte, PicInfo As BITMAP, Cnt As Long

Private Sub Command1_Click()

'Get information (such as height and width) about the picturebox

GetObject Picture1.Image, Len(PicInfo), PicInfo

'reallocate storage space

ReDim PicBits(1 To PicInfo.bmWidth * PicInfo.bmHeight * 3) As Byte

'Copy the bitmapbits to the array

GetBitmapBits Picture1.Image, UBound(PicBits), PicBits(1)

'Invert the bits

For Cnt = 1 To UBound(PicBits)

PicBits(Cnt) = 255 - PicBits(Cnt)

Next Cnt

'Set the bits back to the picture

SetBitmapBits Picture1.Image, UBound(PicBits), PicBits(1)

'refresh

Picture1.Refresh

End Sub

在VB.net中如何将图片转换成二进制保存到Accees中

在access数据库里将字段的类型设置为ole对象

Public img As Byte() '图片处理用的字节数组

img=My.Computer.FileSystem.ReadAllBytes(filePath)'filePath是你图片文件的路径

剩下的就是数据库插入操作了

Dim cn As New OleDb.OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Data.mdb")

Dim comm As OleDb.OleDbCommand

comm = New OleDb.OleDbCommand( _

"INSERT INTO Photo(BuFan_F,PhotoNo,Photo) Values('"  Me.CobBuFan.Text.Trim  "','"  Me.txtNo.Text.Trim  "',@image)", cn)

'向数据库添加存储了图片数据的二进制数组

comm.Parameters.Add("@image", _

OleDb.OleDbType.Binary, img.Length).Value = img

If cn.State = ConnectionState.Closed Then cn.Open() '打开数据库连接

comm.ExecuteNonQuery() '执行数据库命令

If cn.State = ConnectionState.Open Then cn.Close() '关闭数据库连接

MessageBox.Show("图片成功保存到数据库", "完成", MessageBoxButtons.OK, MessageBoxIcon.Information)