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ISAPI Extensions: Creating a DLL to Enable HTTP-based File Uploads with IIS

Posted By:      Posted Date: August 21, 2010    Points: 0   Category :ASP.Net

The MIME-compliant content type, called multipart/form-data, makes writing HTML that uploads files almost trivial. On the server side though, ASP does not have a way to access data in the multipart/form-data format. The most flexible way to access the uploaded file is through a C++ ISAPI Extension DLL. This article describes a reusable ISAPI extension DLL that allows you to upload images and files without writing C++ code. It is coupled with a few COM components that make it readily reusable for ASP development. With .NET, this whole process is much easier, and this article shows preliminary code that uploads files using ASP.NET features.

Panos Kougiouris

MSDN Magazine October 2001

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More Related Resource Links

WinInet: Enable HTTP Communication in Windows-Based Client Applications


The Internet provides the infrastructure for applications to communicate, and that can include non-UI communication between Win32-based applications. If you think beyond the standard browser usage of HTTP, you can use this protocol to retrieve information from Win32-based applications and save it to a Web server. After explaining how HTTP can be used in this way, this article shows how to use Microsoft SQL Server, ASP, IIS, WinInet, and Visual Basic to implement two examples. The first reports usage data-how often an application is used and by whom. The second monitors application errors and reports error details for use by helpdesk staff or engineers in the debugging process.

Todd Meister

MSDN Magazine June 2001

Error " http 404 not found" in while creating FBA enabled Claims based Authen.Web Appln with custom




1)While creating a claims based autheitcation web appln in sps 2010, i have given a  custom login page [say mylogin.aspx] instead of default sign  in page. i gave custom membership provider name, role provider name say CMP1 & CRP1 respectively. there is no sql db for storing user profiles. we have to call a web service to authenticate. and want to know how this can be achieved using claims based authen. with the emntioned custom membership provider

2) When created a sitecollection and tried to navigate i got the error  "http 404  not found --> "web page cannot be found". i am unable to view the home page of this web appln    http://servername:5555/ and       its sitecollection url   http://servername:5555/sites/test. Where should I add the custom login page. is that login page doesnt exist in the 14\template\_layouts dierctory, it shows  http not found error if i use custom membership provider for fba with a  custom login page, what are the steps to make this web appln with the custom login page as the landing page.

any help is appreciated.




PrasadWT PrasadWT

How to automatically enable web part connections when creating a publishing page based on a custom p


I have created a simple custom page layout in SharePoint Designer, added a couple of web part zones, and a custom web part on each zone.

These web parts have a custom provider-consumer set of interfaces. I configured the connection between the web parts in SharePoint Designer (using Add Connection wizard), and saved the page layout.

After that, I checked in the layout and approved it in SP's web interface.

Finally, I created a Publishing Page based on my layout, but the connection between the web parts was not set. I can set the connection manually and it works fine, but I would like the connection to be automatically set on each page I create based on the layout.

Is this the expected behavior? If so, is there a way to configure the connection automatically either programmatically or declaratively?

Is there a step I'm missing?

Creating Excel file from C#

I used below coding for create a excel sheet.I got from on web site.
In below coding there is no problem.Its create the excel file.If i run second time,its ask to overwrite the current excel file.If I said "Yes" then it ok ,but If I select cancel button,its generate the Error message.The exception is

I am not able to read xml file with XDocument if its Descendants has Attribute xmlns="http://abc.co


I am not able to read xml file with XDocument if its Descendants has  Attribute like:-

<?xml version="1.0" encoding="utf-8" standalone="yes"?>
  <row ID="1" xmlns="http://www.opentravela.org/OTA/2003/05">
    <var country_name="Caribbean and Rest of the world" city_name="Kingston" flight_category="Economy Class" via="Atlanta" flight_departure="London Heathrow" airline_logo="Delta" adult_fare="Delta" child_fare="660" infant_fare="561" date1="132" date2="2010-08-15" />


I don't know what to do ?

Looking for some help..

creating a code based on the evaluation


I would like to create a simple program, like a game, but so far without any graphical interface. Only a code, supported with some numbers, so that the user will know whats going on in the background.

I was thinking of creating a racing game (like formula 1 or sometihng similar), with available data (attributes) like:

Driver: age, agility, concentration, experiance, stamina,...

Car: engine, chassis, tyres

OneNote 2010: Creating OneNote 2010 Extensions with the OneNote Object Model


Learn how to build applications and plug-ins that interoperate with data from OneNote 2007 and 2010 using the OneNote Object Model library freely available on CodePlex. Andy Gray demonstrates how easy it is to integrate information from OneNote notebooks, sections and pages into smart client and Web apps.

Andy Gray

MSDN Magazine July 2010

Code Name WinFS: Revolutionary File Storage System Lets Users Search and Manage Files Based on Conte


One of the monumental problems organizations face today is aggregating information that's stored in disparate formats. Knowledge workers have long wanted to be able to search for content independent of format. The next version of the Windows operating system, code-named "Longhorn," boasts a new storage subsystem that makes that task easier. That subsystem, code-named "WinFS," allows the user to perform searches based on the metadata of the stored item, regardless of what type of file it is or which application created it. This article covers the basic architecture of WinFS and explains how to use the WinFS managed API.

Richard Grimes

MSDN Magazine January 2004

Resource File: Creating Privacy-aware Web Sites


Privacy issues are of primary concern to those involved in Internet commerce. Some consumers are hesitant to provide information to Web sites without clearly understanding how their data will be used and with whom it will be shared.

MSDN Magazine August 2003

ASP.NET: Intercept, Monitor, and Modify Web Requests with HTTP Filters in ISAPI and ASP.NET


There can be many reasons to reroute incoming Web requests. For instance, sometimes it's necessary to redirect a browser to a page based on user criteria without passing long lists of parameters in the URL. In the past, the only way to intercept such page requests and send them elsewhere was with ISAPI. Now, in ASP.NET, the IHttpModule interface provides notification of server requests, and lets you easily reroute them based on criteria other than browser type or version. Here the author demonstrates the use of IHttpModule for interception and explains the use of ISAPI filters for anyone who isn't yet using ASP.NET.

Panos Kougiouris

MSDN Magazine August 2002

Problems creating a BDC file that use a unique select statment


I'm trying to build an BDC file that will pull information back from two tables in an Oracle database, I can import it without any errors, but then it tells me I do not have a filter when I try and select an item.  When I add a filter I get an error when I import the file.  The error I get is the following.
"Application definition import failed. The following error occurred: The IdentifierName Attribute of the TypeDescriptor named 'TestDate' of the Parameter named ':TestDate' of the Method named 'Get_TestTwelve_List' of the Entity named 'TestTwelve' does not match any of the defined Identifiers for the Entity. Error was encountered at or just before Line: '133' and Position: '16'."

Here is the section of

      <Property Name="RdbCommandText" Type="System.String"><![CDATA[

Programmatically creating a SharePoint Site based on user input


I am working on developing a “Create Website Wizard” for SharePoint 2007 that would do the following (I am simplifying a little for the sake of this post):


1.      Take user input as follows:



Product Code:

Category (I, II, III):

The category will be a choice field (radio buttons or a dropdown)

How to change this code to allow more file uploads

I have a page currently setup to upload 1 image at a time, it uploaded the image, then creates a thumbnail for that image in the same directory. Client needs / wants to be able to upload a few more images at the same time. So i would like to see if i can use the existing code that works, but setup to upload a few more images and process them all to create the thumbnails. I currently have a page that allows them to upload 5 images at a time and that works fine, but its just simple uploading the images, nothing else is happening at that moment. Here is the code i am working with: protected void UploadBtn_Click(Object sender, EventArgs e) { String pth = Server.MapPath("~/gallery/homebirth/images/"); String UploadedFile = MyFile.PostedFile.FileName; int ExtractPos = UploadedFile.LastIndexOf("/") + 1; //to retrieve only Filename from the complete path String UploadedFileName = UploadedFile.Substring(ExtractPos, UploadedFile.Length - ExtractPos); // Display information about posted file. Div is invisible by default FileName.InnerHtml = UploadedFileName; MyContentType.InnerHtml = MyFile.PostedFile.ContentType; ContentLength.InnerHtml = MyFile.PostedFile.ContentLength.ToString(); //div is made visible FileDetails.Visible = true; // Save up

why does WSDL file have httpS? i just need http

I built my c# web service.  Tested it.  I built my android app.  Tested it.  All is well.  I tried to get these things to talk to each other...FAIL.  I found these lines in my wsdl. <wsdl:service name="Service1"> - <wsdl:port name="Service1Soap" binding="tns:Service1Soap"> <soap:address location="" /> </wsdl:port> - <wsdl:port name="Service1Soap12" binding="tns:Service1Soap12"> <soap12:address location="" /> </wsdl:port> </wsdl:service> What decided that the path should be https?  I never told it that.  It is overriding IIS which says everything should be http.  Someone please help me before I go ballistic.  Oh and for others developing on android 2.2, it won't take unsigned certs, so you either have to configure a local certificate authority or go http. 

Creating DLL file for Extended Stored procedure in C#

Hi All,   Is there any way that I can create a dll file for Extended stored procedure(SQL server) in C# ?   I an able to create that in VC++. in VC++ there is DLLMain which serve as entry point and a paramter can be passed to it using Extended stored procedure. But since C# does not have any such entry point. Hence is there any way that I can achieve this?   Any pointers to this will be highly appreciated.   Thanks Sid

Creating a "Save Button" in a browser based Form

I'm not sure if I'm missing something obvious, but I need to have the funtionality of the "Save Button", which is available and works on the tool bar, available in the form...and I can't seem figure out how to do it.I've found examples, in this forum, of how to use the "Submit Button" to act as the "Save Button", which did work for me, but only when specific basic criteria was met.The criteria that I now have is that I'm initiating a workflow to automatically start when a new item is created.  My workflow then moves the form to one of a few possible different form libraries, based on the logic in my workflow.  The different form libraries are to manage different teams of people that would have access to the Form and then that team would process the form accordingly.My specific situation: 1 - User opens a new form (works) 2 - User enters data and then submits the new form (works) 3 - Workflow is initiated and the form is moved to another form library to be worked on by a select group of people (works) 4 - The form is opened and reviewed and some changes are made to the form data by the select group of people (works) 5 - The form data in the form libary is updated (works, but only if the save button is pressed in the tool bar and then manually closes t

Creating a new root Site Collection using a custom site definition file (ONET.XML)

Using Powershell, I am trying to deploy the our custom solution to SP 2010.  The script is doing the following: Deleting the web application using Remove-SPWebApplication Creating a new web application using New-SPWebApplication Adding and deploying a series of WSP files (one of which has the site definition file in it) using Add-SPSolution and Install-SPSolution Create a root site collection based on the site definition file provided in the WSPs using New-SPSite I get the error "WARNING: Template is not found and is not applied." When I run Get-SPWebTemplate, my site definition does not show up. I saw this: http://social.msdn.microsoft.com/Forums/en/sharepoint2010general/thread/5ea46e07-a4b0-4bab-b698-9b6eeb695607 but I want a solution that does not involve me reloading a DLL, as, I feel there is something else I am forgetting. I have also tried: IISReset Resetting the timer service Cleaning the Cache (as described here: http://support.microsoft.com/kb/939308) Nothing seems to work.  Does anyone have any ideas?
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