Home > Developer > ASP

Upload images with ASP. NET and generate thumbnails with copyright information

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞
<% @ Page Language = "C #" ResponseEncoding = "gb2312" %>
<% @ Import Namespace = "System" %>
<% @ Import Namespace = "System. IO" %>
<% @ Import Namespace = "System. Drawing" %>
<% @ Import Namespace = "System. Drawing. Imaging" %>
<Script runat = "server">

Void Page_Load (Object sender, EventArgs e)
{
If (! Page. IsPostBack)
{
ImgPreview. Visible = false;
}
}
Void GetThumbnailImage (int width, int height, string strInfo, int left, int right)
{
String file = "Uploads/" + uploadFile. PostedFile. FileName. Substring (uploadFile. PostedFile. FileName. LastIndexOf (''\'') + 1 );
String newfile = "Uploads/" + uploadFile. PostedFile. FileName. Substring (uploadFile. PostedFile. FileName. LastIndexOf (''\'') + 1) + ". jpg ";
String stradd = strinfo;
System. Drawing. Image oldimage = system. Drawing. image. fromfile (server. mappath (File ));
System. Drawing. Image thumbnailimage =
Oldimage. getthumbnailimage (width, height, new system. Drawing. image. getthumbnailimageabort (thumbnailcallback), intptr. Zero );
Response. Clear ();
Bitmap output = new Bitmap (thumbnailimage );
Graphics G = graphics. fromimage (output );
G. drawstring (stradd, new font ("Courier New", 14), new solidbrush (color. Red), left, right );
Output. Save (server. mappath (newfile), system. Drawing. imaging. imageformat. JPEG );
Response. contenttype = "image/GIF ";
Imgpreview. Visible = true;
Imgpreview. imageurl = newfile;
}
Bool thumbnailcallback ()
{
Return true;
}

Void Button_Click (object sender, EventArgs e)
{
Int width, height, left, right;
String strAddInfo = txtAddInfo. Text;
Width = Int32.Parse (txtWidth. Text );
Height = Int32.Parse (txtHeight. Text );
Left = Int32.Parse (txtLeft. Text );
Right = Int32.Parse (txtRight. Text );
If (! (UploadFile. PostedFile. ContentLength> 0 ))
{
LblErrInfo. Text = "no file selected ";
}
Else
{

String path = Server. mapPath (". /Uploads/"+ uploadFile. postedFile. fileName. substring (uploadFile. postedFile. fileName. lastIndexOf (''\'') + 1 ));
If (File. Exists (path ))
{
LblErrInfo. Text = "a file with the same name already exists ";
}
Else
{
UploadFile. PostedFile. SaveAs (path );
GetThumbnailImage (width, height, strAddInfo, left, right );
}
}
}
</Script>
<Html>
<Head>
</Head>
<Body>
<Form method = "post" enctype = "multipart/form-data" runat = "server">
<P>
<Input id = "uploadFile" type = "file" runat = "server"/>
<Asp: Label id = "lblErrInfo" runat = "server" forecolor = "Red"> </asp: Label>
</P>
<P>
Width: <asp: TextBox id = "txtWidth" runat = "server" Width = "40px"> 100 </asp: TextBox>
Height: <asp: TextBox id = "txtHeight" runat = "server" Width = "40px"> 150 </asp: TextBox>
 
</P>
<P>
Add information: <asp: TextBox id = "txtAddInfo" runat = "server"> AspxBoy. Com </asp: TextBox>
</P>
<P>
Information location: left: <asp: TextBox id = "txtLeft" runat = "server" Width = "40px"> 10 </asp: TextBox>
Right: <asp: TextBox id = "txtRight" runat = "server" Width = "40px"> 135 </asp: TextBox>
</P>
<P>
 
<Input id = "button" type = "button" value = "upload to generate a thumbnail" onServerClick = "Button_Click" runat = "server"/>
</P>
<P> <asp: Image id = "ImgPreview" runat = "server"> </asp: Image>
</P>
<! -- Insert content here -->
</Form>
</Body>
</Html>

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    Open a Ticket

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

    Learn More