使用 ashx 即时调整图像大小

Question

我想在使用 ashx 处理程序时调整图像大小。我从 Android 应用程序获取图像，所有代码都工作正常（图像存储在服务器目录中）但是图像非常非常大。有什么想法可以在 ashx 处理程序中调整图像的大小吗？

HttpPostedFile hpf = context.Request.Files[0] as HttpPostedFile;
    if (hpf.ContentLength != 0)
    {
        savedFileName = context.Server.MapPath("~/Uploads/" + Path.GetFileName(hpf.FileName));
        hpf.SaveAs(savedFileName);
    }

Answer 1

好的，我想通了

HttpPostedFile hpf = context.Request.Files[0] as HttpPostedFile;
    if (hpf.ContentLength != 0)
    {
        var chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
        var random = new Random();
        var result = new string(
            Enumerable.Repeat(chars, 8)
                      .Select(s => s[random.Next(s.Length)])
                      .ToArray());



        savedFileName = context.Server.MapPath("~/Uploads/" + Path.GetFileName(hpf.FileName));
        hpf.SaveAs(savedFileName);


        string File1 = Path.GetFileName(hpf.FileName);
        imageNewval = result + "_ReemEyalLia_" + DateTime.Now.ToString("ddMMyyyhhmmss");

        Bitmap originalBMP = new Bitmap(hpf.InputStream);
        decimal origWidth = originalBMP.Width;
        decimal origHeight = originalBMP.Height;
        decimal sngRatio = origHeight / origWidth;
        int newHeight = 200;
        decimal newWidth_temp = newHeight / sngRatio;
        int newWidth = Convert.ToInt16(newWidth_temp);
        Bitmap newBMP = new Bitmap(originalBMP, newWidth, newHeight);
        Graphics oGraphics = Graphics.FromImage(newBMP);
        oGraphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias; oGraphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Default;
        oGraphics.DrawImage(originalBMP, 0, 0, newWidth, newHeight);
        newBMP.Save(context.Server.MapPath("~/Uploads/" + imageNewval + Path.GetExtension(File1)));

        originalBMP.Dispose();
        newBMP.Dispose();
        oGraphics.Dispose();

    }

使用 ashx 即时调整图像大小

Resize image on the fly using ashx

c#

ashx