1@ Page Language="C#" ResponseEncoding="gb2312"
1@ import Namespace="System"
1@ import Namespace="System.IO"
1@ import Namespace="System.Drawing"
1@ import Namespace="System.Drawing.Imaging"
1<script runat="server">
2
3void Page_Load(Object sender, EventArgs e)
4{
5if(!Page.IsPostBack)
6{
7ImgPreview.Visible=false;
8}
9}
10void GetThumbnailImage(int width,int height,string strInfo,int left,int right)
11{
12string file="Uploads/"+uploadFile.PostedFile.FileName.Substring(uploadFile.PostedFile.FileName.LastIndexOf('\\\')+1);
13string newfile="Uploads/"+uploadFile.PostedFile.FileName.Substring(uploadFile.PostedFile.FileName.LastIndexOf('\\\')+1)+".jpg";
14string strAdd=strInfo;
15System.Drawing.Image oldimage = System.Drawing.Image.FromFile(Server.MapPath(file));
16System.Drawing.Image thumbnailImage =
17oldimage.GetThumbnailImage(width, height,new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback), IntPtr.Zero);
18Response.Clear();
19Bitmap output=new Bitmap(thumbnailImage);
20Graphics g=Graphics.FromImage(output);
21g.DrawString(strAdd,new Font("Courier New", 14),new SolidBrush(Color.Red),left,right);
22output.Save(Server.MapPath(newfile),System.Drawing.Imaging.ImageFormat.Jpeg);
23Response.ContentType = "image/gif";
24ImgPreview.Visible=true;
25ImgPreview.ImageUrl=newfile;
26}
27bool ThumbnailCallback()
28{
29return true;
30}
31
32void Button_Click(object sender, EventArgs e)
33{
34int width,height,left,right;
35string strAddInfo=txtAddInfo.Text;
36width=Int32.Parse(txtWidth.Text);
37height=Int32.Parse(txtHeight.Text);
38left=Int32.Parse(txtLeft.Text);
39right=Int32.Parse(txtRight.Text);
40if(!(uploadFile.PostedFile.ContentLength>0))
41{
42lblErrInfo.Text="没有选择文件";
43}
44else
45{
46
47string path = Server.MapPath("./Uploads/"+uploadFile.PostedFile.FileName.Substring(uploadFile.PostedFile.FileName.LastIndexOf('\\\')+1));
48if(File.Exists(path))
49{
50lblErrInfo.Text="已经有同名文件";
51}
52else
53{
54uploadFile.PostedFile.SaveAs(path);
55GetThumbnailImage(width,height,strAddInfo,left,right);
56}
57}
58}
59</script>
1<html>
2<head>
3</head>
4<body>
5<form enctype="multipart/form-data" method="post" runat="server">
6<p>
7<input id="uploadFile" runat="server" type="file"/>
8<asp:label forecolor="Red" id="lblErrInfo" runat="server"></asp:label>
9</p>
10<p>
11width:<asp:textbox id="txtWidth" runat="server" width="40px">100</asp:textbox>
12 height:<asp:textbox id="txtHeight" runat="server" width="40px">150</asp:textbox>
13
14</p>
15<p>
16添加信息：<asp:textbox id="txtAddInfo" runat="server"> AspxBoy.Com</asp:textbox>
17</p>
18<p>
19信息位置：left:<asp:textbox id="txtLeft" runat="server" width="40px">10</asp:textbox>
20 right:<asp:textbox id="txtRight" runat="server" width="40px">135</asp:textbox>
21</p>
22<p>
23
24<input id="button" onserverclick="Button_Click" runat="server" type="button" value="上传生成所略图"/>
25</p>
26<p><asp:image id="ImgPreview" runat="server"></asp:image>
27</p>
28<!-- Insert content here -->
29</form>
30</body>
31</html>
http://www.aspxboy.com/ShowArticle.Aspx?ID=218