如何在上傳的圖片上寫字

2019-11-17 05:50:11

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供稿：網(wǎng)友

很多時(shí)候需要在用戶上傳的圖片上加上版權(quán)或者一些其他的附加文字信息，如何實(shí)現(xiàn)這樣的功能，下面帖個(gè)簡(jiǎn)單實(shí)現(xiàn)的例子，起到拋磚引玉的作用。
<%@ Page Language="c#" Debug="true" Trace="true"%>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.Drawing.Imaging" %>
<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="上傳文件名："+filename1+"<br>";
        UploadFile.PostedFile.SaveAs(Server.MapPath(filename1));
        ImageEditor.Visible = true;
        dis.Text+="文件大小："+UploadFile.PostedFile.ContentLength+"字節(jié)數(shù)";
        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,0);
        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>
          選擇上傳文件: <input id="UploadFile" type=file runat=server>
          <asp:button Text="Upload Me!" OnClick="UploadBtn_Click" runat=server/>
          <hr>
          <asp:panel id="ImageEditor" Visible=false runat=server>
            <img ID="Image1" src="" runat="server"/>
                圖像寬度: <asp:textbox id="Width" runat=server/>
                圖像高度: <asp:textbox id="Height" runat=server/> <br>
                文本標(biāo)題: <asp:textbox id="Caption" runat=server/>
                標(biāo)題字號(hào): <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>
                標(biāo)題字體: <asp:dropdownlist id="FontType" runat=server>
                                        <asp:listitem>黑體</asp:listitem>
                                        <asp:listitem>仿宋</asp:listitem>
                                        <asp:listitem>隸書</asp:listitem>
                                        <asp:listitem>楷書</asp:listitem>
                                        <asp:listitem>彩云</asp:listitem>
                                        <asp:listitem>新魏</asp:listitem>
                                      </asp:dropdownlist>

                <asp:button Text="Update Image" OnClick="UpdateBtn_Click" runat=server/>

          </asp:panel>
      </form> </body>
</html>

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