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用ASP.NET上传图片并生成可带版权信息的缩略图

2008-04-24 11:24 603 查看

<%@ 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>

</form>
</body>
</html>
ASPxboy.com/ShowArticle.ASPx?ID=218">http://www.ASPxboy.com/ShowArticle.ASPx?ID=218

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