asp. net upload image and handle watermark and thumbnail example code
- 2020-06-15 08:00:06
- OfStack
Methods:
upFileClass.cs
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
/// <summary>
/// upFileClass Summary description of
/// </summary>
public class upFileClass
{
public upFileClass()
{
//
// TODO: Add constructor logic here
//
}
/// <summary>
/// Generate thumbnails
/// </summary>
/// <param name="originalImagePath"> Source map path (physical path) </param>
/// <param name="thumbnailPath"> Thumbnail path (physical path) </param>
/// <param name="width"> Thumbnail width </param>
/// <param name="height"> Thumbnail height </param>
/// <param name="mode"> How to generate thumbnails </param>
public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)
{
System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);
int towidth = width;
int toheight = height;
int x = 0;
int y = 0;
int ow = originalImage.Width;
int oh = originalImage.Height;
switch (mode)
{
case "HW":// Specify height and width scaling (possible distortion)
break;
case "W":// Specify width and height to scale
toheight = originalImage.Height * width / originalImage.Width;
break;
case "H":// Specify height and width in proportion
towidth = originalImage.Width * height / originalImage.Height;
break;
case "Cut":// Specified height and width cut (without deformation)
if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
{
oh = originalImage.Height;
ow = originalImage.Height * towidth / toheight;
y = 0;
x = (originalImage.Width - ow) / 2;
}
else
{
ow = originalImage.Width;
oh = originalImage.Width * height / towidth;
x = 0;
y = (originalImage.Height - oh) / 2;
}
break;
default:
break;
}
// new 1 a bmp The picture
System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);
// new 1 A drawing board
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);
// Set up a high quality interpolation
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
// Set high quality , Low speed presents smoothness
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
// Empty the canvas and fill it with a transparent background color
g.Clear(System.Drawing.Color.Transparent);
// Draws the specified part of the original image at the specified location and at the specified size
g.DrawImage(originalImage, new System.Drawing.Rectangle(0, 0, towidth, toheight),
new System.Drawing.Rectangle(x, y, ow, oh),
System.Drawing.GraphicsUnit.Pixel);
try
{
// In order to jpg Format to save thumbnails
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch (System.Exception e)
{
throw e;
}
finally
{
originalImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
}
/// <summary>
/// Add a text watermark to an image
/// </summary>
/// <param name="Path"> Path to the original server image </param>
/// <param name="Path_sy"> The generated image path with text watermark </param>
public static void AddShuiYinWord(string Path, string Path_sy)
{
string addText = " Love wisdom from ";
System.Drawing.Image image = System.Drawing.Image.FromFile(Path);
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
g.DrawImage(image, 0, 0, image.Width, image.Height);
System.Drawing.Font f = new System.Drawing.Font("Verdana", 16);
System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.Blue);
g.DrawString(addText, f, b, 15, 15);
g.Dispose();
image.Save(Path_sy);
image.Dispose();
}
/// <summary>
/// Generate image watermark on the image
/// </summary>
/// <param name="Path"> Path to the original server image </param>
/// <param name="Path_syp"> The generated image path with image watermark </param>
/// <param name="Path_sypf"> Watermark image path </param>
public static void AddShuiYinPic(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();
}
}
Default. aspx code:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>asp.net Upload pictures and process them The watermark The thumbnail </title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:FileUpload ID="FileUpload1" runat="server" BorderColor="Gray" BorderWidth="1px" />
<asp:Button ID="Button1" runat="server" onClick="Button1_Click" Text=" upload " BorderColor="Gray" BorderWidth="1px" Width="70px" /><br />
<asp:Label ID="Label1" runat="server"></asp:Label>
</div>
</form>
</body>
</html>
Default. aspx. cs code:
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
if (FileUpload1.HasFile)
{
string fileContentType = FileUpload1.PostedFile.ContentType;
if (fileContentType == "image/bmp" || fileContentType == "image/gif" || fileContentType == "image/pjpeg")
{
string name = FileUpload1.PostedFile.FileName; // Client file path
FileInfo file = new FileInfo(name);
string fileName = file.Name; // The file name
string fileName_s = "s_" + file.Name; // Thumbnail file name
string fileName_sy = "sy_" + file.Name; // Name of watermark File (text)
string fileName_syp = "syp_" + file.Name; // Name of watermark File (image)
// The following paths can be modified as appropriate
string webFilePath = Server.MapPath("file/" + fileName); // Server side file path
string webFilePath_s = Server.MapPath("file/" + fileName_s); // Server side thumbnail path
string webFilePath_sy = Server.MapPath("file/" + fileName_sy); // Server side with watermark path ( The text )
string webFilePath_syp = Server.MapPath("file/" + fileName_syp); // Server side with watermark path ( The picture )
// The following is the path of the watermark image 1 Make sure you're ready 1 A watermark image!
string webFilePath_sypf = Server.MapPath("file/shuiyin.jpg"); // Server side watermark path ( The picture )
if (!File.Exists(webFilePath))
{
try
{
FileUpload1.SaveAs(webFilePath); // use SaveAs Method save file
upFileClass.AddShuiYinWord(webFilePath, webFilePath_sy);
upFileClass.AddShuiYinPic(webFilePath, webFilePath_syp, webFilePath_sypf);
upFileClass.MakeThumbnail(webFilePath, webFilePath_s, 130, 130, "Cut"); // Method of generating thumbnails
Label1.Text = " Tip: File" " + fileName + " "Upload successfully and generate" " + fileName_s + " "Thumbnail, file type: " + FileUpload1.PostedFile.ContentType + " , the file size is: " + FileUpload1.PostedFile.ContentLength + "B";
}
catch (Exception ex)
{
Label1.Text = " Note: File upload failed. Reason for failure: " + ex.Message;
}
}
else
{
Label1.Text = " Tip: The file already exists. Please rename and upload ";
}
}
else
{
Label1.Text = " Note: File type does not match ";
}
}
}
}