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asp.net上传图片并同时生成缩略图 RRS feed

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  • <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>


    资料引用:http://www.knowsky.com/3292.html

    2009年5月27日 7:06