ASP圖片格式與base64數據互轉方法

ASP圖片格式與base64數據相互轉換的方法，常常用於處理表單中存儲有base64字符串格式的圖片。

獲取到base64數據，轉換成圖片

<%
Subfolder=year(now)&month(now)&day(now)&hour(now)&minute(now)&second(now()) ''生成當天的子文件夾的名稱
picture=Trim(request.Form("urls"))
picture=replace(picture,"data:image/png;base64,","")
path=Subfolder&".jpg"
xmlstr="<data>"&picture&"</data>"
Dim xml : Set xml=Server.CreateObject("MSXML2.DOMDocument")
Dim stm : Set stm=Server.CreateObject("ADODB.Stream")
xml.resolveExternals=False
xml.loadxml(xmlstr)
xml.documentElement.setAttribute "xmlns:dt","urn:schemas-microsoft-com:datatypes"
xml.documentElement.dataType = "bin.base64"
stm.Type=1 'adTypeBinary
stm.Open
stm.Write xml.documentElement.nodeTypedValue
stm.SaveToFile Server.MapPath(path)
stm.Close
Set xml=Nothing
Set stm=Nothing
response.Write("http://codeo.cn/"&path)
%>

圖片轉換爲Base64字符串方法

<%
Function ImagesToBase64(FileName)
Dim xml
Dim root
Dim fs
Dim FilePath
Dim objStream
Dim objXMLDoc
Dim Base64
''定義變量完結
'建立對像
FilePath=Server.MapPath(FileName)
getFileExt = Mid(FilePath, InstrRev(FilePath, ".") + 1)

Set objXMLDoc=Server.CreateObject("msxml2.FreeThreadedDOMDocument")
    '設定生成XML文檔的根爲 Base64Data
    objXMLDoc.loadXML "<?xml version='1.0'?><Base64Data />"

Set fs = Server.createObject("Scripting.FileSystemObject") ''服務器須要FSO組件
If fs.FileExists(FilePath) Then '判斷File文件是否存在
    '用 stream 來讀取數據
    Set objStream = Server.CreateObject("ADODB.Stream")
    objStream.Type = 1
    objStream.Open
    objStream.LoadFromFile FilePath

    objXMLDoc.documentElement.dataType = "bin.base64"
    objXMLDoc.documentElement.nodeTypedvalue = objStream.Read
    '數據流讀取結束.獲得了值 objXMLDoc
    '建立XML文件
          Set xml = Server.CreateObject("msxml2.FreeThreadedDOMDocument")
          xml.load objXMLDoc
          If xml.ReadyState>2 Then
            Set root=xml.getElementsByTagName("Base64Data")
            Base64=""
          else
            Base64=""
          End If
          Set xml=Nothing
    Set objStream=Nothing
else
            Base64=""
End If

Set fs=Nothing
Set objXMLDoc=Nothing

ImagesToBase64=Base64

End Function
%>

<%
'測試時同文件夾應該包含該圖片文件。
response.Write ImagesToBase64("12.jpg")
%>