<%@ 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="没有选择文件"; } else { string path = Server.MapPath("./Uploads/"+uploadFile.PostedFile.FileName.Substring(uploadFile.PostedFile.FileName.LastIndexOf('//')+1)); if(File.Exists(path)) { lblErrInfo.Text="已经有同名文件"; } 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> 添加信息：<asp:TextBox id="txtAddInfo" runat="server"> AspxBoy.Com</asp:TextBox> </p> <p> 信息位置：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="上传生成所略图" onServerClick="Button_Click" runat="server" /> </p> <p><asp:Image id="ImgPreview" runat="server"></asp:Image> </p> <!-- Insert content here --> </form></body></html
