[转]Asp.net上传图片并自动缩放图片大小

<%@ Import Namespace="System.Drawing.Imaging" %> <%@ Import Namespace="System.Drawing" %><%@ Import Namespace="System.IO" %><%@ Page Language="c#" Debug="true" Trace="true"%>

<%@ Import Namespace="System.Drawing.Imaging" %>
<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.IO" %>
<%@ Page Language="c#" Debug="true" Trace="true"%>
<HTML>
    <script runat="server">
      void UploadBtn_Click(Object sender, EventArgs e) {
         String filename;
         String filename1;
         String[] filename2;
         int q;
         filename=UploadFile.PostedFile.FileName ;
         filename2=filename.Split(new Char[] {'\\'});
         q=filename2.GetUpperBound(0);
         filename1=filename2[q];
         dis.Text="上传文件名："+filename1+"<br>";
         UploadFile.PostedFile.SaveAs(Server.MapPath(filename1));
         ImageEditor.Visible = true;
         dis.Text+="文件大小："+UploadFile.PostedFile.ContentLength+"字节数";
         Image1.Src=filename1;      
      } 
      void UpdateBtn_Click(Object sender, EventArgs e) {
         String filename1;
         filename1=Image1.Src;
         System.Drawing.Image image = System.Drawing.Image.FromFile(Server.MapPath(filename1));
         System.Drawing.Image newimage = new Bitmap(image.Width, image.Height, PixelFormat.Format32bppRgb);
         Graphics g = Graphics.FromImage(newimage);
         g.DrawImage(image,0,0,image.Width,image.Height);
         Font f = new Font(FontType.SelectedItem.Text, Int32.Parse(FontSize.SelectedItem.Text));
         Brush b = new SolidBrush(Color.Red);
         g.DrawString(Caption.Text, f, b, 10, 140);
         g.Dispose();
         System.Drawing.Image thumbImage = newimage.GetThumbnailImage(Int32.Parse(Width.Text),Int32.Parse(Height.Text),null,IntPtr.Zero);
         image.Dispose();
         thumbImage.Save(Server.MapPath(filename1), ImageFormat.Jpeg);
         Image1.Src=filename1;       
         Caption.Text="";     
   
      }

    </script>
    <body>
        <asp:label id="dis" runat="server" />
        <form enctype="multipart/form-data" runat="server" ID="Form1">
            <h3>
                Select File To Upload: <input id="UploadFile" type="file" runat="server" NAME="UploadFile">
                <asp:button Text="Upload Me!" OnClick="UploadBtn_Click" runat="server" ID="Button1" />
                <hr>
                <asp:panel id="ImageEditor" Visible="false" runat="server">
                    <IMG id="Image1" src="" runat="server">
                    <H3>Image Width:
                        <asp:textbox id="Width" runat="server"></asp:textbox>Image Height:
                        <asp:textbox id="Height" runat="server"></asp:textbox><BR>
                        Text Caption:
                        <asp:textbox id="Caption" runat="server"></asp:textbox>Caption Size:
                        <asp:dropdownlist id="FontSize" runat="server">
                            <asp:listitem>14</asp:listitem>
                            <asp:listitem>18</asp:listitem>
                            <asp:listitem>26</asp:listitem>
                            <asp:listitem>36</asp:listitem>
                            <asp:listitem>48</asp:listitem>
                            <asp:listitem>62</asp:listitem>
                        </asp:dropdownlist>Caption Font:
                        <asp:dropdownlist id="FontType" runat="server">
                            <asp:listitem>黑体</asp:listitem>
                            <asp:listitem>仿宋</asp:listitem>
                            <asp:listitem>隶书</asp:listitem>
                            <asp:listitem>楷书</asp:listitem>
                            <asp:listitem>方正姚体</asp:listitem>
                            <asp:listitem>华文彩云</asp:listitem>
                        </asp:dropdownlist>
                        <asp:Button id="Button2" onclick="UpdateBtn_Click" runat="server" Text="Update Image"></asp:Button></H3>
                </asp:panel>
        </form>
        </H3>
        <H3></H3>
        </FORM>
    </body>
</HTML>

posted @ 2007-10-19 01:20  zhangh  阅读(678)  评论(0)  编辑  收藏  举报