关于image按原图比例缩放的问题， 谢谢~~

[qq346127416]

我的图片不在本地 在服务器的ip地址里， 我如何通过URI去获得图片的尺寸 然后进行缩放呢？

System.Drawing.Image bigimage = System.Drawing.Image.FromFile(image.ImageUrl);

这样只能获取本地的图片 不支持uri格式 谢谢各位了~~

[wuyq11]

System.Drawing.Image.FromFile 只支持本地Path
可先下载到本地或内存System.Drawing.Image.FromStream

[微工程]

      Byte[] oFileByte = new byte[this.UploadFile.PostedFile.ContentLength];
        System.IO.Stream oStream = this.UploadFile.PostedFile.InputStream;
        System.Drawing.Image oImage = System.Drawing.Image.FromStream(oStream);

        int oWidth = oImage.Width; //原图宽度 
        int oHeight = oImage.Height; //原图高度 
        int tWidth = 540; //设置缩略图初始宽度 
        int tHeight = 640; //设置缩略图初始高度 
        int sWidth = 146; //设置缩略图初始宽度 
        int sHeight = 92; //设置缩略图初始高度 

        //按比例计算出缩略图的宽度和高度 
        if (oWidth >= oHeight)
        {
            tHeight = (int)Math.Floor(Convert.ToDouble(oHeight) * (Convert.ToDouble(tWidth) / Convert.ToDouble(oWidth)));
            sHeight = (int)Math.Floor(Convert.ToDouble(oHeight) * (Convert.ToDouble(sWidth) / Convert.ToDouble(oWidth)));
        }
        else
        {
            tWidth = (int)Math.Floor(Convert.ToDouble(oWidth) * (Convert.ToDouble(tHeight) / Convert.ToDouble(oHeight)));
            sWidth = (int)Math.Floor(Convert.ToDouble(oWidth) * (Convert.ToDouble(sHeight) / Convert.ToDouble(oHeight)));
        }

        //生成缩略原图 
        Bitmap tImage = new Bitmap(tWidth, tHeight);
        Graphics g = Graphics.FromImage(tImage);
        g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; //设置高质量插值法 
        g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;//设置高质量,低速度呈现平滑程度 
        g.Clear(Color.Transparent); //清空画布并以透明背景色填充 

        Bitmap sImage = new Bitmap(sWidth, sHeight);
        Graphics p = Graphics.FromImage(sImage);
        p.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; //设置高质量插值法 
        p.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;//设置高质量,低速度呈现平滑程度 
        p.Clear(Color.Transparent); //清空画布并以透明背景色填充 
        this.hd_sytp.Value = "o" + DateTime.Now.ToShortDateString().Replace("-", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + ".jpg";
        string sltp = "t" + DateTime.Now.ToShortDateString().Replace("-", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + ".jpg";
        string sFullName = Server.MapPath("../") + "res_syzs\\" + this.hd_sytp.Value ; //保存原图的物理路径 
        string tFullName = Server.MapPath("../") + "res_syzs\\" + sltp; //保存缩略图的物理路径 
        try
        {
            //以JPG格式保存图片 
            g.DrawImage(oImage, new Rectangle(0, 0, tWidth, tHeight), new Rectangle(0, 0, oWidth, oHeight), GraphicsUnit.Pixel);
            tImage.Save(tFullName, System.Drawing.Imaging.ImageFormat.Jpeg);
            p.DrawImage(oImage, new Rectangle(0, 0, sWidth, sHeight), new Rectangle(0, 0, oWidth, oHeight), GraphicsUnit.Pixel);
            sImage.Save(sFullName, System.Drawing.Imaging.ImageFormat.Jpeg);

        }
        catch (Exception ex)
        {
           // throw ex;
        }
        finally
        {
            //释放资源 
            oImage.Dispose();
            g.Dispose();
            tImage.Dispose();
        }

[kkbac]

[Quote=引用楼主 qq346127416 的回复:]
我的图片不在本地 在服务器的ip地址里， 我如何通过URI去获得图片的尺寸 然后进行缩放呢？

System.Drawing.Image bigimage = System.Drawing.Image.FromFile(image.ImageUrl);

这样只能获取本地的图片 不支持uri格式 谢谢各位了~~
[/Quote]

可在客户端用js缩放。