图片上传问题

请帮我下面的问题：图片上传问题

这是我的代码： ASPX代码：

function UploadImage(path) //Added by Archana on 14-Aug-2013 
{   

var Sketch_Code,url,str; 
Sketch_Code= document.getElementById('<%=txtCode.ClientID%>').value; 
var strPage,strWidthProperty ; 
var retVal=""; 
if(Sketch_Code !="") 
{ 
    if(path!="" && path!=null) 
    { 
// var timeout = setTimeout("Imageresize(path,Sketch_Code);", 5000); 
// alert(timeout); 
    var img = Imageresize(path,Sketch_Code); 
    if (document.getElementById('<%=imgload.ClientID%>').complete) 
    {alert("loaded"); 
    url = "<%= ConfigurationManager.AppSettings("SiteURL").ToString() %>Upload_Images/800x800/" ; 
    document.getElementById('<%=imgload.ClientID%>').src =url + img; 
    document.getElementById('<%=imagePath.ClientID%>').value=img; 
    } 

    } 
} 
} 

function clickFileUpload() 
{ 
     $('input[type=file]:first').trigger('click'); 
     var imgpath=document.getElementById("imgfile").value; 
     //alert(imgpath); 
      if(imgpath =='') 
      { 
      // There is no file selected 
      alert("Please select valid file."); 
      } 
      else 
      { 
      var Extension = imgpath.substring(imgpath.lastIndexOf('.') + 1).toUpperCase(); 
      if (Extension == "BMP" || Extension == "JPG" || Extension == "JPEG" || Extension == "GIF" || Extension == "PNG") 
      { 
       UploadImage(imgpath);// Valid file type   
      } 
      else 
      { 
      // Not valid file type 
        alert("Please select valid extension file. (.bmp,.jpeg,.jpg,.png,.gif)"); 
      } 
      } 
} 

function Imageresize(e,c) 
{ 
    //alert(e.id); 
    var Imagename = e; 
    var Code=c; 
    $.ajax({async : false, 
        type : 'GET', /*callback: function(index){CalculateTotal()},*/ 
        url : "ImageResizer.aspx?Sketch_Code="+ c +"&imagepath=" + e, 
        success : function(response) 
        { 
         setTimeout('checkForAllImagesLoaded()', 5); 
         ImagesString = response; 
         // var ArrValues = ImagesString.split("~"); 


        } 

      }); 
    return ImagesString;   
}

这就是：

<input type="Button" id="BtnUpload" class="button1" value="Upload Image" onclick="clickFileUpload();" />

ASPX页面上的JavaScript函数我在ImageResizer页上的代码：

Imports System.IO 
Imports System.Drawing 
Imports System.Drawing.Imaging 
Imports System.Drawing.Drawing2D 

Partial Class ImageResizer 
    Inherits System.Web.UI.Page 
    Public Shared Function ResizeImage(ByVal image As Image, ByVal path As String, ByVal size As Size, Optional ByVal preserveAspectRatio As Boolean = True) As Image 
     Dim newWidth As Integer 
     Dim newHeight As Integer 
     If preserveAspectRatio Then 
      Dim originalWidth As Integer = image.Width 
      Dim originalHeight As Integer = image.Height 
      Dim percentWidth As Single = CSng(size.Width)/CSng(originalWidth) 
      Dim percentHeight As Single = CSng(size.Height)/CSng(originalHeight) 
      Dim percent As Single 
      percent = IIf(percentHeight < percentWidth, percentHeight, percentWidth) 
      newWidth = CInt(originalWidth * percent) 
      newHeight = CInt(originalHeight * percent) 
     Else 
      newWidth = size.Width 
      newHeight = size.Height 
     End If 
     Dim newImage As Image = New Bitmap(newWidth, newHeight) 
     Using graphicsHandle As Graphics = Graphics.FromImage(newImage) 
      graphicsHandle.InterpolationMode = InterpolationMode.HighQualityBicubic 
      graphicsHandle.DrawImage(image, 0, 0, newWidth, newHeight) 
     End Using 
     newImage.Save(path) 
     Return newImage 
    End Function 

    Function UploadFileToServer(ByVal filepath As String, ByVal code As String) As String 
     Dim scriptStr As String = "" 
     Dim FileName As String 
     Try 
      Dim fileExtension As String = Path.GetExtension(filepath).ToLower() 
      FileName = code.Trim() + DateTime.Today.ToShortDateString().Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + fileExtension 
      File.Copy(filepath, Server.MapPath("Upload_Images/") & FileName) 

     Catch ex As Exception 

     End Try 
     Return FileName 
    End Function 

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load 
     Dim filepath, resizedpath, code As String 
     filepath = Request.QueryString("imagepath") 
     code = Request.QueryString("Sketch_Code") 
     If filepath <> "" Then 
      filepath = UploadFileToServer(filepath, code) 
      Dim original As Image = Image.FromFile(Server.MapPath("Upload_Images/") & filepath) 
      resizedpath = Server.MapPath("Upload_Images/200X200/") & filepath 
      ResizeImage(original, resizedpath, New Size(200, 200)) 
      resizedpath = Server.MapPath("Upload_Images/800X800/") & filepath 
      ResizeImage(original, resizedpath, New Size(800, 800)) 
      Response.Expires = -1 
      Response.ContentType = "text/plain" 
      Response.Write(filepath.ToString()) 
      Response.End() 
     End If 


    End Sub 
End Class

此代码在我的本地（开发环境）上工作正常但是，当我在服务器上部署此服务器后尝试上载时，我的代码不能用于$ .ajax函数。无法获得返回我的图像字符串的响应。

请帮忙

来源

2013-10-30 Arch

它返回你，GDI错误。？

对于GDI错误请参阅此：

这是因为 “Upload_Images /” 目录缺少的。

因此要获得的

你必须写在Catch块下面的代码正确的位置打印

Response.Write(Server.MapPath("Upload_Images/"));

这将返回Upload_Images文件夹的正确路径。

来源

2013-10-30 11:41:25 Manoj

图片上传问题

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