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我使用Flickr API和MSXML2.ServerXMLHTTP.6.0來讀取XML響應。捕獲對象需要:使用MSXML2.ServerXMLHTTP.6.0'[object]'
例如:
返回:
<rsp stat="ok">
<photos page="1" pages="847622" perpage="1" total="847622">
<photo id="8658999887" owner="[email protected]" secret="13e2615193" server="8123" farm="9" title="cheeses" ispublic="1" isfriend="0" isfamily="0"/>
</photos>
</rsp>
我做一些簡單的ASP設置變量值:
vurl = https://www.flickr.com/services/rest/?method=flickr.photos.search&api_key=[mykey]&text=cheese&per_page=1&sort=relevance&min_upload_date=2010-05-25
Set http = Server.CreateObject("MSXML2.ServerXMLHTTP.6.0")
http.Open "GET", vurl, False
http.Send
Set dom = http.responseXML
Set items = dom.getElementsByTagName("photos")
If NOT (items IS Nothing) Then
For Each item In items
Set tags = item.getElementsByTagName("photo")
If NOT (tags IS Nothing) Then
var_id = tags(0).getAttribute("id")
var_owner = tags(0).getAttribute("owner")
var_server = tags(0).getAttribute("server")
var_farm = tags(0).getAttribute("farm")
var_title = tags(0).getAttribute("title")
var_public = tags(0).getAttribute("public")
var_secret = tags(0).getAttribute("secret")
var_img_url2 = "https://farm"&var_farm&".staticflickr.com/"&var_server&"/"&var_id&"_"&var_secret&"_b.jpg"
var_id = ""
%>
<%
End If
Next
end if
我的問題是,如果沒有這由API返回搜索字詞的圖像 - 例如「aplogranite」 XML響應是:
<rsp stat="ok">
<photos page="1" pages="0" perpage="1" total="0"/>
</rsp>
我上面的代碼返回此錯誤:
Microsoft VBScript runtime error '800a01a8'
Object required: '[object]'
我想通過捕捉它:
Set items = dom.getElementsByTagName("photos")
If NOT (items IS Nothing) Then...
但它仍然錯誤。
我想知道如何捕獲錯誤,以便我可以處理XML不包含「照片」標記內的任何數據的情況?
[文檔](https://msdn.microsoft.com/en- us/library/ms762212%28v = vs.85%29.aspx)support this:「即使沒有匹配,IXMLDOMNodeList對象也會返回,在這種情況下,列表的長度將設置爲零。」 –