Use Asp.net to implement simple text watermarks and asp.net text watermarks

Use Asp.net to implement simple text watermarks and asp.net text watermarks

It is often seen that a dynamic image is pasted on MOP, that is, a string is passed as a parameter to a dynamic web page, and an image with this string is generated, which is called a text watermark. Similar to the original pandatv series, as well as the later big trees and gold bars, they are quite interesting. It is very simple to write with Asp.net. The Code is as follows:

<% @ Import Namespace = "System" %>
<% @ Import Namespace = "System. IO" %>
<% @ Import Namespace = "System. Drawing" %>

<% @ Page language = "vb" %>

<Script runat = "server">
Dim FilePath As String = Server. MapPath ("Talk. JPG ")

Sub Page_Load (Sender As Object, E As EventArgs)
Dim image As System. Drawing. Image = System. Drawing. Image. FromFile (FilePath)
Dim g As Graphics = Graphics. FromImage (image)
G. DrawImage (image, 0, 0, image. Width, image. Height)
Dim f As Font = new Font (" 文 ", 40)
Dim B As Brush = new SolidBrush (Color. Black)
Dim s As String = Left (Request. QueryString ("str"), 7)
G. DrawString (s, f, B, 20,190)
Image. Save (Response. OutputStream, System. Drawing. Imaging. ImageFormat. Jpeg)
G. Dispose ()
Image. Dispose ()
End Sub
</Script>

You only need to save this code as An aspx file, such as Test. aspx. Put it in wwwroot (assuming your virtual directory is default ). Make another image of Talk. JPG and print the text in the font "文" in (20,190. The call method is simple:

Http: // localhost/Test. aspx? Str = test failed!

You can set the printing position, Font, and image files. In addition, if e is used as the parameter, it can be displayed normally, but Chinese cannot be displayed, because Asp.net web. if the config settings are incorrect, the following settings are required:

<? Xml version = "1.0" encoding = "UTF-8"?>
<Configuration>
<System. web>
<Globalization requestEncoding = "gb2312" responseEncoding = "gb2312" culture = "zh-CN" fileEncoding = "gb2312"/>
</System. web>
</Configuration>

In this way, it can be displayed normally.