确定DateLastModified通过ASP或ASPNET网络基础JPG图片 [英] Determine DateLastModified for a web base JPG Image via ASP or ASPNet

问题描述

在ASP页面或者页面ASPNET VBS，我想确定日期当远程基于Web的JPG文件创建（或修改等）。例如，一个摄像头拍摄这是FTP-ED的网站。因此，用JPG的URL，我怎么能获得对JPG的属性。

Using VBS in an ASP page or ASPNet page, I would like to determine the date when a remote web-based JPG file was created (or modified, etc). For example a webcam shot which was FTP-ed to the website. Thus, with the URL of the JPG, how can I get to the properties of that JPG.

在code下面我试图检索图像文件并将其保存到我的网站网页，但我得到了 objADOStream.SaveToFile（strSave，2）的路线错误它说，

In the code below I tried to retrieve the image file and save it into my site web, but I get an error on the "objADOStream.SaveToFile (strSave,2)" line which says that

System.Runtime.InteropServices.COMException：写入文件失败。

"System.Runtime.InteropServices.COMException: Write to file failed.".

我知道我已经读/写权限到该文件夹​​中我经常创建/删除.txt文件存在。

I know I have read/write permissions to that folder as I regularly create/delete .txt files there.

• 您可为什么我不能够保存此文件有何评论？


• 假如我不把它保存在原始文件的属性被保留？


• 或者，也许甚至更好，有更简单的方式来获得照片文件的信息？

下面是code，我拼凑起来的检索和保存文件

Here is the code that I cobbled together to retrieve and save the file

 dim strURL, strSave, objXMLHTTP, objADOStream, objFSO

 strURL = "http://www.somewhere.com/Photo.jpg"
 strSave = Server.MapPath("/xxx/photos/") & "photo.jpg"

 objXMLHTTP = CreateObject("MSXML2.XMLHTTP")

 objXMLHTTP.open ("GET", strURL, false)
 objXMLHTTP.send()

 if err.number=0 then

if objXMLHTTP.readystate = 4 then

  If objXMLHTTP.Status = 200 Then

    objADOStream = CreateObject("ADODB.Stream")
    objADOStream.Open
    objADOStream.Type = 1 

    objADOStream.Write (objXMLHTTP.ResponseBody)
    objADOStream.Position = 0       

    objFSO = Createobject("Scripting.FileSystemObject")

    If objFSO.Fileexists(strSave) Then objFSO.DeleteFile (strSave)
    objFSO = Nothing

    objADOStream.SaveToFile (strSave,2)
    objADOStream.Close
    objADOStream = Nothing
  End If
end if
 end if
 objXMLHTTP = Nothing

谢谢... RDK

Thanks...RDK

推荐答案

如果你需要的是知道的，而不是发送一个GET请求文件的最后修改日期，发送HEAD请求。在您的code修改 GET 与 HEAD 和后发得

If all you need is to know the last modification date of the file, instead of sending a GET request, send a HEAD request. In your code change GET with HEAD and, after send get

objXMLHTTP.getResponseHeader("Last-Modified") 

这可能是服务器不发送这些信息，所以你没有办法知道这些数据。

It is possible that the server don't send this information, so you have no way to know this data.

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