[高分]在asp.net中如何将一段文本生成一张透明的图片？

还要透明阿
给你一段往图片写文字的
，有个原始透明图，写进去，不知道行不行
<%@ Page Language="c#" Debug="true" Trace="true"%>
//debug,trace为测试时用的
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.Drawing.Imaging" %>
<html>
<script runat =server>
      void UploadBtn_Click(Object sender, EventArgs e) {
         UploadFile.PostedFile.SaveAs(Server.MapPath("test1.jpg"));
         ImageEditor.Visible = true;
      }
      void UpdateBtn_Click(Object sender, EventArgs e) {
         System.Drawing.Image image = System.Drawing.Image.FromFile(Server.MapPath("test1.jpg"));
         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("Lucida Sans Unicode", Int32.Parse(FontSize.SelectedItem.Text));
//font集，tnnd,没有使出中文来，那位老兄弄出来告诉我一声
         Brush b = new SolidBrush(Color.Red);
//写字的颜色
         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("test.jpg"), ImageFormat.JPEG);
      }   </script>   <body>     <form enctype="multipart/form-data" runat=server>          <h3>          Select File To Upload: <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 src="test.jpg">             <h3>
                Image Width: <asp:textbox id="Width" runat=server/>                 Image Height: <asp:textbox id="Height" runat=server/> <br>                 Text Caption: <asp:textbox id="Caption" runat=server/>                 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>                 <asp:button Text="Update Image" OnClick="UpdateBtn_Click" runat=server/>             </h3>
          </asp:panel>      </form>   </body>
</html>

帮你查了查，好像没有现成的
http://www.codeproject.com/csharp/Water/Water_src.zip
这个代码，可以在现有图片生成水印和自加入文字

找到这个函数
public ValidationImage(string Text, Font font, Color ForeColor, Color BackgroundColor)
  {
    Bitmap bm = new Bitmap(1,1);
    Graphics gs = Graphics.FromImage(bm);     bm = new Bitmap(Convert.ToInt32(gs.MeasureString(Text, font).Width),Convert.ToInt32(gs.MeasureString(Text, font).Height));     gs = Graphics.FromImage(bm);
    gs.Clear(BackgroundColor);
    gs.TextRenderingHint = TextRenderingHint.AntiAlias;
    gs.DrawString(Text, font, new SolidBrush(ForeColor), 0, 0);
    gs.Flush();
  }

http://community.csdn.net/Expert/topic/3041/3041776.xml?temp=.4296686

在ASP.NET下实现数字和字符相混合的验证码 http://dev.csdn.net/develop/article/22/22618.shtm

调试易

[高分]在asp.net中如何将一段文本生成一张透明的图片？

解决方案 »