ThreadPriority Property, ASPForm class

Description

Let's you specify priority value of the ASP thread which will read form data from a client.

Syntax

vThreadPriority = ASPForm.ThreadPriority
ASPForm.ThreadPriority = vThreadPriority

Returns

ThreadPriorities - Priority values for the thread.

Remarks

     ASP takes a lot of processor time to read data from a client and then transfer the data from IIS process (inetinfo.exe) to asp process (dllhost.exe). One client uploading huge files with good internet connection can cause other asp pages on your internet server slow down. Response times to other clients accessing your asp pages at the same time of upload can be worse then.
     You can set a little bit less thread priority for the thread reading upload data using ThreadPriority property. Windows will handle other requests than upload with higher priority. ASPForm uses the priority only during Read method.
     ASPForm calls SetThreadPriority Win32 API function with ThreadPriority value before Read method and with tpNormal after Read.

Examples

Upload - handle other requests with higher priority

<%
'This file is using ThreadPriority to set less thread priority for upload

Dim DestinationPath
DestinationPath = Server.MapPath("UploadFolder")

Dim Form: Set Form = Server.CreateObject("ScriptUtils.ASPForm")

Server.ScriptTimeout = 2000
Form.SizeLimit = &H10000000
Form.ThreadPriority = -1

If Form.State = 0 Then 'completed
  Form.Files.Save DestinationPath 
  Response.Write "<br><Font Color=green>Files (" & _
    Form.TotalBytes \1024 & "kB) was saved to " & _
    DestinationPath & " folder.</Font>"
ElseIf Form.State > 10 Then
  Const fsSizeLimit = &HD
  Select Case Form.State
    Case fsSizeLimit: Response.Write  _
     "<br><Font Color=red>Source form size (" & _
     Form.TotalBytes & "B) exceeds form limit (" & _
     Form.SizeLimit & "B)</Font><br>"
    Case Else Response.Write _
     "<br><Font Color=red>Some form error.</Font><br>"
  End Select
End If'Form.State = 0 then

%>

Methods of ASPForm class

AddConnection, CancelConnection, CheckRequirements, Read, Sleep, StringToBinary

Properties of ASPForm class

BytesRead, Files, FormType, getForm, CharSet, ChunkReadSize, Items, MaxMemoryStorage, NewUploadID, ReadTime, ReadTimeout, SizeLimit, SourceData, State, TempPath, Texts, ThreadPriority, TotalBytes, UploadID

ScriptUtils.ASPForm

The ASPForm collection retrieves the values of form elements posted to ASP script by a form using the POST method. ASPForm can process multipart/form-data or application/x-www-form-urlencoded data with length up to 2GB.

ScriptUtils

     Huge ASP upload is easy to use, hi-performance ASP file upload component with progress bar indicator. This component lets you upload multiple files with size up to 2GB to a disk or a database along with another form fields. Huge ASP file upload is a most featured upload component on a market with competitive price and a great performance.

     The software has also a free version of asp upload with progress, called Pure asp upload, written in plain VBS, without components (so you do not need to install anything on server).

     This installation package contains also ScriptUtilities library. Script Utilities lets you create hi-performance log files, works with binary data, you can download multiple files with zip/arj compression, work with INI files and much more with the ASP utility.

ThreadPriority