在access数据库里将字段的类型设置为ole对象
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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)
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
'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
一、二进制文件读写
1、写二进制数据到指定目录
==将barray字节数组中的数据创建在strFilename目录文件下，存储格式为二进制，False表示不添加，直接覆盖创建。
2、从指定路径下读取二进制数据到数组
==将目录中的文件读取到barry字节数组中，即读取二进制文件。
二、字符文件的读写
1、 将txtFile控件中的字符写到srtFileName指定目录,以创建方式。
2、从srtFileName目录中的文件读取到txtFile控件
