前文：实在是好久没有更新这个博客了。主要是本人现在不走技术路线，过了那个研究技术的年代了。现在做一些零散的很多事情。

今天突然收到猎头的邮件，看着心里激动啊。呵呵。当然，目前的状况也就看看，毕竟人生的目标和要求已经变了。此一时彼一时

但还是TMD激动啊。。。

翻了翻自己的文件夹，最近实在是没有什么原创的东西，把这个很久以前做的图片加水印的程序share出来，我做了些小封装。不算完全原创。

Imports Microsoft.VisualBasic
Imports System
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Drawing.Imaging
Imports System.IO

'code ex:
'Dim wm As New ImageDrawing.ImageModify
'        thefile.PostedFile.SaveAs(System.Web.HttpContext.Current.Server.MapPath("1.jpg")) //thisfile is a file upload html control
'Dim imgoutput As Image = System.Drawing.Bitmap.FromFile(System.Web.HttpContext.Current.Server.MapPath("1.jpg"))

'        With wm
'            .WaterMarkImagePath = System.Web.HttpContext.Current.Server.MapPath("a.gif")
'            .LucencyPercent = 10
'            .ModifyImagePath = System.Web.HttpContext.Current.Server.MapPath("1.jpg")
'            .WaterImagePosition = ImageDrawing.ImageModify.WaterImagePositionType.RightBottom
'            .OutPath = System.Web.HttpContext.Current.Server.MapPath("2.jpg")
'            .DrawImage()
'        End With

Namespace ImageDrawing
    '/// <summary>
    '/// 图片修改类,主要是用来保护图片版权的
    '/// </summary>

Public Class ImageModify

#Region "member fields"
        Private mModifyImagePath As String = ""
        Private mWaterMarkImagePath As String = ""
        Private mWaterImagePosition As WaterImagePositionType
        Private mRightSpace As Int32
        Private mBottoamSpace As Int32
        Private mLucencyPercent As Int32 = 50
        Private mOutPath As String = ""
#End Region

'///设置水印在原图像中的位置
        Public Enum WaterImagePositionType
            LeftTop
            RightTop
            Center
            LeftBottom
            RightBottom
            Value
        End Enum

#Region "propertys"
        '/// <summary>
        '/// 获取或设置要修改的图像路径
        '/// </summary>
        Public Property ModifyImagePath() As String
            Get
                Return mModifyImagePath
            End Get
            Set(ByVal Value As String)
                mModifyImagePath = Value
            End Set
        End Property

'/// <summary>
        '/// 获取或设置在画的图片路径(水印图片)
        '/// </summary>
        Public Property WaterMarkImagePath() As String
            Get
                Return mWaterMarkImagePath
            End Get
            Set(ByVal Value As String)
                mWaterMarkImagePath = Value
            End Set
        End Property

'///设置水印在原图像中的位置
        Public Property WaterImagePosition() As WaterImagePositionType
            Get
                Return mWaterImagePosition
            End Get
            Set(ByVal Value As WaterImagePositionType)
                mWaterImagePosition = Value
            End Set
        End Property

'/// <summary>
        '/// 获取或设置水印在修改图片中的右边距
        '/// </summary>
        Public Property RightSpace() As Int32
            Get
                Return mRightSpace
            End Get
            Set(ByVal Value As Int32)
                mRightSpace = Value
            End Set
        End Property

'//获取或设置水印在修改图片中距底部的高度
        Public Property BottoamSpace() As Int32
            Get
                Return mBottoamSpace
            End Get
            Set(ByVal Value As Int32)
                mBottoamSpace = Value
            End Set
        End Property

'/// <summary>
        '/// 获取或设置要绘制水印的透明度,注意是原来图片透明度的百分比
        '/// </summary>
        Public Property LucencyPercent() As Int32
            Get
                Return mLucencyPercent
            End Get
            Set(ByVal Value As Int32)
                If Value >= 0 And Value <= 100 Then
                    mLucencyPercent = Value
                Else
                    mLucencyPercent = 50
                End If

End Set
        End Property

'/// <summary>
        '/// 获取或设置要输出图像的路径
        '/// </summary>
        Public Property OutPath() As String
            Get
                Return mOutPath
            End Get
            Set(ByVal Value As String)
                mOutPath = Value
            End Set
        End Property

#End Region

#Region "methods"
        '/// <summary>
        '/// 开始绘制水印/图片水印，可设置透明度等
        '/// </summary>
        Public Function DrawImage() As Boolean

Dim bolReturn As Boolean = True

Dim modifyImage As Image = Nothing
            Dim drawedImage As Image = Nothing
            Dim g As Graphics = Nothing
            Try
                '//建立图形对象
                modifyImage = Image.FromFile(Me.ModifyImagePath)
                drawedImage = Image.FromFile(Me.WaterMarkImagePath)
                g = Graphics.FromImage(modifyImage)
                '//获取要绘制图形坐标
                Dim x As Int32
                Dim y As Int32
                Select Case Me.WaterImagePosition
                    Case WaterImagePositionType.Center
                        x = (modifyImage.Width - drawedImage.Width) / 2
                        y = (modifyImage.Height - drawedImage.Height) / 2
                    Case WaterImagePositionType.LeftBottom
                        x = 0
                        y = modifyImage.Height - drawedImage.Height
                    Case WaterImagePositionType.LeftTop
                        x = 0
                        y = 0
                    Case WaterImagePositionType.RightBottom
                        x = modifyImage.Width - drawedImage.Width
                        y = modifyImage.Height - drawedImage.Height
                    Case WaterImagePositionType.RightTop
                        x = modifyImage.Width - drawedImage.Width
                        y = 0
                    Case WaterImagePositionType.Value
                        x = modifyImage.Width - Me.RightSpace
                        y = modifyImage.Height - Me.BottoamSpace
                    Case Else
                        x = 0
                        y = 0
                End Select
                If x < 0 Then
                    x = 0
                End If
                If y < 0 Then
                    y = 0
                End If
                '//设置颜色矩阵
                Dim colorMatrix As ColorMatrix = New ColorMatrix(New Single()() _
                   {New Single() {1, 0, 0, 0, 0}, _
                    New Single() {0, 1, 0, 0, 0}, _
                    New Single() {0, 0, 1, 0, 0}, _
                    New Single() {0, 0, 0, Convert.ToSingle(Me.LucencyPercent / 100.0F), 0}, _
                    New Single() {0, 0, 0, 0, 1}})

Dim imgAttr As ImageAttributes = New ImageAttributes
                imgAttr.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap)
                '//绘制阴影图像
                g.DrawImage(drawedImage, New Rectangle(x, y, drawedImage.Width, drawedImage.Height), 0, 0, drawedImage.Width, drawedImage.Height, GraphicsUnit.Pixel, imgAttr)
                '//保存文件
                Dim allowImageType As String() = {".jpg", ".gif", ".png", ".bmp", ".tiff", ".wmf", ".ico"}
                Dim file As FileInfo = New FileInfo(Me.ModifyImagePath)
                Dim imageType As ImageFormat = ImageFormat.Gif
                Select Case file.Extension.ToLower()
                    Case ".jpg"
                        imageType = ImageFormat.Jpeg
                    Case ".gif"
                        imageType = ImageFormat.Gif
                    Case ".png"
                        imageType = ImageFormat.Png
                    Case ".bmp"
                        imageType = ImageFormat.Bmp
                    Case ".tif"
                        imageType = ImageFormat.Tiff
                    Case ".wmf"
                        imageType = ImageFormat.Wmf
                    Case ".ico"
                        imageType = ImageFormat.Icon
                    Case Else
                        imageType = ImageFormat.Jpeg
                End Select
                Dim ms As MemoryStream = New MemoryStream()
                modifyImage.Save(ms, imageType)
                Dim imgData As Byte() = ms.ToArray()
                Dim fs As FileStream = Nothing

If Not Me.OutPath.Equals(String.Empty) Then
                    fs = New FileStream(Me.OutPath, FileMode.Create, FileAccess.Write)
                Else
                    fs = New FileStream(Me.ModifyImagePath, FileMode.Create, FileAccess.Write)
                End If
                If Not fs Is Nothing Then
                    fs.Write(imgData, 0, imgData.Length)
                    fs.Close()
                End If
            Catch ex As Exception
                bolReturn = False
            Finally

End Try
            Return bolReturn

End Function

'修改图片大小
        Public Function SizeChange(ByVal intWidth As Int32, ByVal intHeight As Int32) As Boolean
            Dim bolReturn As Boolean = True
            Try
                Dim modifyImage As Image = Image.FromFile(Me.ModifyImagePath)
                '//
                Dim imageOut As Image = modifyImage.GetThumbnailImage(intWidth, intHeight, Nothing, System.IntPtr.Zero)
                '//保存文件
                Dim allowImageType As String() = {".jpg", ".gif", ".png", ".bmp", ".tiff", ".wmf", ".ico"}
                Dim file As FileInfo = New FileInfo(Me.ModifyImagePath)
                Dim imageType As ImageFormat
                Select Case file.Extension.ToLower()
                    Case ".jpg"
                        imageType = ImageFormat.Jpeg
                    Case ".gif"
                        imageType = ImageFormat.Gif
                    Case ".png"
                        imageType = ImageFormat.Png
                    Case ".bmp"
                        imageType = ImageFormat.Bmp
                    Case ".tif"
                        imageType = ImageFormat.Tiff
                    Case ".wmf"
                        imageType = ImageFormat.Wmf
                    Case ".ico"
                        imageType = ImageFormat.Icon
                    Case Else
                        imageType = ImageFormat.Jpeg
                End Select
                imageOut.Save(OutPath, imageType)
            Catch ex As Exception
                bolReturn = False
            Finally

End Try
            Return bolReturn

End Function
#End Region

#Region "new"
        Public Sub New()
            ModifyImagePath = ""
            WaterMarkImagePath = ""
            RightSpace = 0
            BottoamSpace = 0
            LucencyPercent = 50
            OutPath = ""
            mWaterImagePosition = WaterImagePositionType.LeftTop
        End Sub

#End Region
    End Class

End Namespace

调用部分：

Imports System.IO
Imports System.Drawing

Partial Class PicTest2
    Inherits System.Web.UI.Page

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        '//thefile是个file field html 控件
        thefile.PostedFile.SaveAs(System.Web.HttpContext.Current.Server.MapPath("BBS\SnkProductImages\1.jpg"))
        Dim memstream As System.IO.MemoryStream = New System.IO.MemoryStream()
        Dim imgoutput As System.Drawing.Image = System.Drawing.Bitmap.FromFile(System.Web.HttpContext.Current.Server.MapPath("BBS\SnkProductImages\1.jpg"))
        '//修改成80×80大小
        Dim imgoutput2 As System.Drawing.Image = imgoutput.GetThumbnailImage(80, 80, Nothing, System.IntPtr.Zero)
        imgoutput2.Save(System.Web.HttpContext.Current.Server.MapPath("BBS\SnkProductImages\2.jpg"), System.Drawing.Imaging.ImageFormat.Jpeg)
        Response.Write(thefile.PostedFile.FileName)
        Response.Write("len:" + memstream.length.tostring())
        imgoutput.Dispose()
        imgoutput2.Dispose()
        Response.Write("上传成功!")
        Response.Write(System.Web.HttpContext.Current.Server.MapPath("BBS\SnkProductImages\2.jpg"))

'//加文字水印，注意，这里的代码和以下加图片水印的代码不能共存
        Dim g As Graphics = Graphics.FromImage(imgoutput)
        g.DrawImage(imgoutput, 0, 0, imgoutput.Width, imgoutput.Height)
        Dim f As Font = New Font("Verdana", 32)
        Dim b As Brush = New SolidBrush(Color.Red)
        Dim addText As String = "SNK Star"
        g.DrawString(addText, f, b, 10, 10)
        g.Dispose()

imgoutput.Save(System.Web.HttpContext.Current.Server.MapPath("BBS\SnkProductImages\3.jpg"), System.Drawing.Imaging.ImageFormat.Jpeg)

End Sub

End Class