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asp.net上传图片并同时生成缩略图
发表日期:2003-06-05作者:[] 出处:  

<script language="VB" runat="server">

Sub UploadFile(sender As Object, e As EventArgs)

If FileUp.PostedFile.ContentLength = 0 Then

FileInfo.Visible = False

Exit Sub

Else

FileInfo.Visible = True

FDisplay1.Visible = True

End If

FSize.Text ="上传文件大小"+ CStr(FileUp.PostedFile.ContentLength/1024)+"KB"

FName.Text = "已上传文件名:"+FileUp.PostedFile.FileName+"<br>"+FName.Text

'写入数据库

on error resume next

dim myconn as sqlconnection

dim mycomm as sqlcommand

dim sql as string

dim id as integer

Dim image,anewimage As System.Drawing.Image

dim width,height,newwidth,newheight as integer

Dim callb As System.Drawing.Image.GetThumbnailImageAbort

myConn=New sqlconnection(ConfigurationSettings.AppSettings("数据库"))

myconn.open()

sql="insert into picture (姓名,班级,介绍,属性) values ('"&request.cookies("dgxyl").values("dgxylname")&"','"&request.cookies("dgxyl").values("dgxylbj")&"','"&trim(request("TextBox1"))&"','"&request("r1")&"')"

Mycomm=New sqlcommand(sql,myconn)

mycomm.executenonquery()

myconn.close()

Dim myCommand As New SqlCommand("select top 1 id from picture order by id desc", myConn)

myCommand.Connection.Open()

Dim myReader As SqlDataReader=mycommand.executereader()

if myReader.Read() then

id=myReader("id")

end if

myconn.close()

'保存图片

FileUp.PostedFile.SaveAs( Server.MapPath("\classpic\")&cstr(id)&".jpg" )

'生成缩略图

image=System.Drawing.Image.FromFile(Server.MapPath("/classpic/"+cstr(id)+".jpg"))

width=image.Width

height=image.height

if width>height then

newwidth=250

newheight=image.height/image.Width*newwidth

else

newheight=250

newwidth=image.Width/image.height*newheight

end if

response.write("id="+cstr(id)+"width="+cstr(Width)+";height="+cstr(height)+" ")

response.write("newwidth="+cstr(newwidth)+";newheight="+cstr(newheight)+"<br>")

aNewImage=image.GetThumbnailImage(newwidth,newheight,callb,new System.IntPtr())

aNewImage.Save(Server.MapPath("/smallpic/"+cstr(id)+".jpg"))

image.Dispose()

Dim FileSplit() As String = Split( FileUp.PostedFile.FileName, "\" )

Dim FileName As String = FileSplit(FileSplit.Length-1)

Dim Exts() As String = Split( FileName, "." )

Dim Ext As String = LCase(Exts(Exts.Length-1))

FDisplay.Text = "<A Target='_blank' HREF='/classpic/"&cstr(id)&".jpg"& "'>查看上传文件</A>"

FDisplay1.text="<a href='/picture/default.asp?bj="&cstr(request.cookies("dgxyl").values("dgxylbj"))&"'>返回</a>"

End Sub

</script>

<SCRIPT language=JavaScript>

<!--

var requestsubmitted=false;

function guestbook_Validator(theForm)

{

//检查是否从新提交

if (requestsubmitted==true){

 alert("你已经提交了留言,请等待服务器应答!");

 return(false);

}

requestsubmitted=true;

return (true);

}

//-->

</SCRIPT>

<Html>

<Body BgColor=White>

<H3 align="center">请正确填写下面各项</h3>

<Hr></H3>

<Div id="FileInfo" Visible="False" runat="server">

<Asp:Label id="FSize" runat="server"/><br>

<Asp:Label id="FName" runat="server"/><br>

<Asp:Label id="FDisplay" runat="server"/>

<Asp:Label id="FDisplay1" runat="server"/>

</Div>

<Form Enctype="multipart/form-data" onsubmit="return guestbook_Validator(this)" runat="server">

上传文件

<Input Type="File" id="FileUp" runat="server" size="20"><br>

图片属性:<input type="radio" value="<%=request.cookies("dgxyl").values("dgxylbj")%>" name="R1" checked>本班<input type="radio" value="全校" name="R1">全校(本班则只在本班显示,全校则在全校显示)<P>

图片说明:<br>

<asp:TextBox id="TextBox1" runat="server" Width="233px" Height="141px">

</asp:TextBox>

    <asp:RequiredFieldValidator id="RequiredFieldValidator1" runat="server" ControlToValidate="TextBox1" ErrorMessage="请输入图片说明">

</asp:RequiredFieldValidator><br>

<Asp:button id="Upload" OnClick="UploadFile" Text="上传图片" runat="server"/>

</form>

<Hr>

<p>注意:</p>

<ol>

 <li><b>严禁上传污染环境的照片,否则账号将被删除!</b></li>

 <li><font color="#808000"><b>请详细填写照片说明,图片说明不详细将会被视为乱传图片,将会被删除!</b></font></li>

</ol>

<p> </p>

</Body>

</Html>

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