ASP.NET上傳圖片并生成可帶版權信息的縮略圖
2024-07-10 12:40:55
供稿：網友
代碼如下:
<%@ 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="沒有選擇文件";
}
else
{
string path = Server.MapPath("./Uploads/"+uploadFile.PostedFile.FileName.Substring(uploadFile.PostedFile.FileName.LastIndexOf('//')+1));
if(File.Exists(path))
{
lblErrInfo.Text="已經有同名文件";
}
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>
