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[转]Asp.net上传图片并自动缩放图片大小

2007-10-19 01:20 435 查看

<%@ Import Namespace="System.Drawing.Imaging" %> <%@ Import Namespace="System.Drawing" %><%@ Import Namespace="System.IO" %><%@ Page Language="c#" Debug="true" Trace="true"%>

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="上传文件名："+filename1+"
";
UploadFile.PostedFile.SaveAs(Server.MapPath(filename1));
ImageEditor.Visible = true;
dis.Text+="文件大小："+UploadFile.PostedFile.ContentLength+"字节数";
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,IntPtr.Zero);
image.Dispose();
thumbImage.Save(Server.MapPath(filename1), ImageFormat.Jpeg);
Image1.Src=filename1;
Caption.Text="";

}

<%@ Import Namespace="System.Drawing.Imaging" %>
<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.IO" %>
<%@ Page Language="c#" Debug="true" Trace="true"%>
<HTML>
<script runat="server">

</script>
<body>
<asp:label id="dis" runat="server" />
<form enctype="multipart/form-data" runat="server" ID="Form1">
<h3>
Select File To Upload: <input id="UploadFile" type="file" runat="server" NAME="UploadFile">
<asp:button Text="Upload Me!" OnClick="UploadBtn_Click" runat="server" ID="Button1" />
<hr>
<asp:panel id="ImageEditor" Visible="false" runat="server">
<IMG id="Image1" src="" runat="server">
<H3>Image Width:
<asp:textbox id="Width" runat="server"></asp:textbox>Image Height:
<asp:textbox id="Height" runat="server"></asp:textbox><BR>
Text Caption:
<asp:textbox id="Caption" runat="server"></asp:textbox>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>Caption Font:
<asp:dropdownlist id="FontType" runat="server">
<asp:listitem>黑体</asp:listitem>
<asp:listitem>仿宋</asp:listitem>
<asp:listitem>隶书</asp:listitem>
<asp:listitem>楷书</asp:listitem>
<asp:listitem>方正姚体</asp:listitem>
<asp:listitem>华文彩云</asp:listitem>
</asp:dropdownlist>
<asp:Button id="Button2" onclick="UpdateBtn_Click" runat="server" Text="Update Image"></asp:Button></H3>
</asp:panel>
</form>
</H3>
<H3></H3>
</FORM>
</body>
</HTML>

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