ASP.NET上传图片并生成可带版权信息的缩略图
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2023-11-25 14:13:28
复制代码 代码如下:<%@ page language="c#" responseencoding="gb2312" %>...
复制代码 代码如下:
<%@ 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="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>
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