1.如何通过c#读写（JPG格式）的源码摘要信息

如何通过c#读写（JPG格式）的摘要信息

       using System;

       using System.Collections.Generic;

       using System.Text;

       namespace SnhjCms.Common

       {

        /// <summary>

        /// 处理类

        /// </summary>

        public static class PictureUtil

        {

        /// <summary>

        /// 生成缩略图

        /// </summary>

        /// <param name="imgPath">原路径</param>

        /// <param name="breviaryPath">缩略图路径</param>

        /// <param name="width">缩略图宽度</param>

        /// <param name="height">缩略图高度</param>

        /// <param name="mode">生成方式</param>

        public static void MakeBreviaryPhoto(string imgPath, string breviaryPath, int width, int height, string mode)

        {

        System.Drawing.Image image = System.Drawing.Image.FromFile(imgPath);

        int x = 0, y = 0;

        int w = image.Width;

        int h = image.Height;

        switch (mode)

        {

        case "HW"://指定高度和宽度缩放（会变形）

        break;

        case "W"://指定宽度缩放，高度按比例。源码磁性自瞄源码

        height = h * width / w;

        break;

        case "H"://指定高度缩放，源码iapp源码资源盒宽度按比例。源码源码之家爱给

        width = w * height / h;

        break;

        case "Cut"://指定高度和宽度裁剪。源码荆州联通直播源码

        if ((double)w / (double)h > (double)width / (double)height)

        {

        w = h * width / height;

        x = (image.Width - w) / 2;

        }

        else

        {

        h = w * height / width;

        y = (image.Height - h) / 2;

        }

        break;

        default:

        break;

        }

        //创建一个bmp

        System.Drawing.Image bmpImg = new System.Drawing.Bitmap(width,源码白鸟源码论坛分享 height);

        //新建一个画板

        System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bmpImg);

        //设置高质量插值法

        g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;

        //设置高质量,低速度呈现平滑程度

        g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

        //清空画布并以透明背景色填充

        g.Clear(System.Drawing.Color.Transparent);

        //在指定位置并且按指定大小绘制原的指定部分

        g.DrawImage(image, new System.Drawing.Rectangle(0,0,width,height), new System.Drawing.Rectangle(x,y,w,h), System.Drawing.GraphicsUnit.Pixel);

        try

        {

        //以jpg格式保存缩略图

        bmpImg.Save(breviaryPath, System.Drawing.Imaging.ImageFormat.Jpeg);

        }

        catch (Exception e)

        {

        throw e;

        }

        finally

        {

        image.Dispose();

        bmpImg.Dispose();

        g.Dispose();

        }

        }

       /// <summary>

        /// 加水印

        /// </summary>

        /// <param name="filename">文件名</param>

        /// <param name="watermarkFilename">水印文件名</param>

        /// <param name="watermarkStatus">水印位置:0=不使用 1=左上 2=中上 3=右上 4=左中 ... 9=右下</param>

        /// <param name="quality">是否是高质量 取值范围0--</param>

        /// <param name="watermarkTransparency">水印透明度 取值范围1-- (为不透明)</param>

        public static void AddImageSignPic(string Path, string filename, string watermarkFilename, int watermarkStatus, int quality, int watermarkTransparency)

        {

        System.Drawing.Image img = System.Drawing.Image.FromFile(Path);

        System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(img);

        //设置高质量插值法

        //g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;

        //设置高质量,低速度呈现平滑程度

        //g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

        System.Drawing.Image watermark = new System.Drawing.Bitmap(watermarkFilename);

        if (watermark.Height >= img.Height || watermark.Width >= img.Width)

        {

        return;

        }

        System.Drawing.Imaging.ImageAttributes imageAttributes = new System.Drawing.Imaging.ImageAttributes();

        System.Drawing.Imaging.ColorMap colorMap = new System.Drawing.Imaging.ColorMap();

        colorMap.OldColor = System.Drawing.Color.FromArgb(, 0, , 0);

        colorMap.NewColor = System.Drawing.Color.FromArgb(0, 0, 0, 0);

        System.Drawing.Imaging.ColorMap[] remapTable = { colorMap };

        imageAttributes.SetRemapTable(remapTable, System.Drawing.Imaging.ColorAdjustType.Bitmap);

        float transparency = 0.5F;

        if (watermarkTransparency >= 1 && watermarkTransparency <= )

        {

        transparency = (watermarkTransparency / .0F);

        }

        float[][] colorMatrixElements = {

        new float[] { 1.0f, 0.0f, 0.0f, 0.0f, 0.0f},

        new float[] { 0.0f, 1.0f, 0.0f, 0.0f, 0.0f},

        new float[] { 0.0f, 0.0f, 1.0f, 0.0f, 0.0f},

        new float[] { 0.0f, 0.0f, 0.0f, transparency, 0.0f},

        new float[] { 0.0f, 0.0f, 0.0f, 0.0f, 1.0f}

        };

        System.Drawing.Imaging.ColorMatrix colorMatrix = new System.Drawing.Imaging.ColorMatrix(colorMatrixElements);

        imageAttributes.SetColorMatrix(colorMatrix, System.Drawing.Imaging.ColorMatrixFlag.Default, System.Drawing.Imaging.ColorAdjustType.Bitmap);

        int xpos = 0;

        int ypos = 0;

        switch (watermarkStatus)

        {

        case 1:

        xpos = (int)(img.Width * (float).);

        ypos = (int)(img.Height * (float).);

        break;

        case 2:

        xpos = (int)((img.Width * (float).) - (watermark.Width / 2));

        ypos = (int)(img.Height * (float).);

        break;

        case 3:

        xpos = (int)((img.Width * (float).) - (watermark.Width));

        ypos = (int)(img.Height * (float).);

        break;

        case 4:

        xpos = (int)(img.Width * (float).);

        ypos = (int)((img.Height * (float).) - (watermark.Height / 2));

        break;

        case 5:

        xpos = (int)((img.Width * (float).) - (watermark.Width / 2));

        ypos = (int)((img.Height * (float).) - (watermark.Height / 2));

        break;

        case 6:

        xpos = (int)((img.Width * (float).) - (watermark.Width));

        ypos = (int)((img.Height * (float).) - (watermark.Height / 2));

        break;

        case 7:

        xpos = (int)(img.Width * (float).);

        ypos = (int)((img.Height * (float).) - watermark.Height);

        break;

        case 8:

        xpos = (int)((img.Width * (float).) - (watermark.Width / 2));

        ypos = (int)((img.Height * (float).) - watermark.Height);

        break;

        case 9:

        xpos = (int)((img.Width * (float).) - (watermark.Width));

        ypos = (int)((img.Height * (float).) - watermark.Height);

        break;

        }

        g.DrawImage(watermark, new System.Drawing.Rectangle(xpos, ypos, watermark.Width, watermark.Height), 0, 0, watermark.Width, watermark.Height, System.Drawing.GraphicsUnit.Pixel, imageAttributes);

        System.Drawing.Imaging.ImageCodecInfo[] codecs = System.Drawing.Imaging.ImageCodecInfo.GetImageEncoders();

        System.Drawing.Imaging.ImageCodecInfo ici = null;

        foreach (System.Drawing.Imaging.ImageCodecInfo codec in codecs)

        {

        if (codec.MimeType.IndexOf("jpeg") > -1)

        {

        ici = codec;

        }

        }

        System.Drawing.Imaging.EncoderParameters encoderParams = new System.Drawing.Imaging.EncoderParameters();

        long[] qualityParam = new long[1];

        if (quality < 0 || quality > )

        {

        quality = ;

        }

        qualityParam[0] = quality;

        System.Drawing.Imaging.EncoderParameter encoderParam = new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qualityParam);

        encoderParams.Param[0] = encoderParam;

        if (ici != null)

        {

        img.Save(filename, ici, encoderParams);

        }

        else

        {

        img.Save(filename);

        }

        g.Dispose();

        img.Dispose();

        watermark.Dispose();

        imageAttributes.Dispose();

        }

        /// <summary>

        /// 在上生成水印

        /// </summary>

        /// <param name="Path">原服务器路径</param>

        /// <param name="Path_syp">生成的带水印的路径</param>

        /// <param name="Path_sypf">水印路径</param>

        public static void AddWaterPic(string Path, string Path_syp, string Path_sypf)

        {

        System.Drawing.Image image = System.Drawing.Image.FromFile(Path);

        System.Drawing.Image copyImage = System.Drawing.Image.FromFile(Path_sypf);

        System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);

        g.DrawImage(copyImage, new System.Drawing.Rectangle(image.Width - copyImage.Width, image.Height - copyImage.Height, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, System.Drawing.GraphicsUnit.Pixel);

        g.Dispose();

        image.Save(Path_syp);

        image.Dispose();

        }

        }

       }