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File downloading with COM and ASP

, , 5 Sep 2000
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A COM object you can use to transfer files in ASP
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  • VC Component source - 43 Kb
  • VB Component source - 6 Kb
  • Example ASP script - 1 Kb
  • Introduction

    This article is about direct file downloading through a COM component. It uses the IResponse interface to send a file directly to the client browser.

    With this approach you can protect your files from being downloaded by an unauthorized person.

    To send the file to the client you need to register this kind of file within the IIS MIME types. To do it go to the ISS administration and under the HTTP Header add this kind of file. In the sample a zip file is used, so the MIME type is:

    To send a file to the browser you must set the Response.Buffer to TRUE and the ContentType to the file type. After this you send the data using the Response object through the BinaryWrite method.

    To accomplish this task a component was developed: FileTransfer. The interface used is called IBinaryRead. These are its methods:

    Method Description
    ReadBinFile(filename) This method returns the content of the file as an VARIANT (SAFEARRAY)
    ResponseBinaryWrite(filename, responseObject) This method reads the file and send it using the Response object. It returns the operation result

    If you want to download a custom file type, you must register it in the client machine too.

    An example of using the FileTransfer object follows:

    	Option Explicit
    	Dim objBinaryRead 
    	Dim saBinFile		'if you don't want error safe
    	Dim bDownloadStatus
    	Set objBinaryRead = CreateObject("FileTransfer.BinaryRead")
    	Response.Buffer      = true
    	Response.ContentType = "application/x-zip-compressed"
    	'transfer the file to the client		
    	bDownloadStatus = objBinaryRead.ResponseBinaryWrite("c:\temp\", Response)
    	'this is not an error safe code
    	'if the file doesn't exist the ASP will have an error
    	'saBinFile = objBinaryRead.ReadBinFile("c:\temp\")     
    	'Response.BinaryWrite saBinFile
    	'Set saBinFile     = nothing
    	Set objBinaryRead = nothing


    This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

    A list of licenses authors might use can be found here


    About the Authors

    Architect VisionOne AG
    Switzerland Switzerland
    XicoLoko is a brazilian developer based in Switzerland.

    Curt Robinson
    United States United States
    No Biography provided

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    Comments and Discussions

    QuestionHow to know where the file is saved ? Pin
    Anonymous19-Nov-02 15:34
    sussAnonymous19-Nov-02 15:34 
    AnswerRe: How to know where the file is saved ? Pin
    Anonymous15-Jul-05 18:35
    sussAnonymous15-Jul-05 18:35 
    Generalthere much time for large file Pin
    jinux23-Sep-02 19:29
    memberjinux23-Sep-02 19:29 
    Generaldowloading a pdf file Pin
    Arti17-Jun-02 6:26
    memberArti17-Jun-02 6:26 
    GeneralRe: dowloading a pdf file Pin
    Anonymous23-Jun-02 14:29
    memberAnonymous23-Jun-02 14:29 
    GeneralRe: dowloading a pdf file Pin
    Anonymous30-Jan-04 9:26
    sussAnonymous30-Jan-04 9:26 
    Generaldownloading files with Netscape Pin
    Matti Niskasaari3-Jan-02 0:24
    memberMatti Niskasaari3-Jan-02 0:24 
    GeneralFile Download Pin
    Lakshmi Kanth Upadrasta15-Nov-01 12:25
    memberLakshmi Kanth Upadrasta15-Nov-01 12:25 
    GeneralDownload file Pin
    edss7-Nov-01 1:39
    memberedss7-Nov-01 1:39 
    Generalprocess names the file incorrectly Pin
    lyndonjohnson14-Aug-01 9:56
    memberlyndonjohnson14-Aug-01 9:56 
    GeneralRe: process names the file incorrectly Pin
    Tai15-Aug-01 16:23
    memberTai15-Aug-01 16:23 
    GeneralRe: process names the file incorrectly Pin
    Michael Stern6-Sep-01 5:15
    memberMichael Stern6-Sep-01 5:15 
    Generalmime types Pin
    luc2-Aug-01 3:49
    memberluc2-Aug-01 3:49 
    GeneralRe: mime types Pin
    Jocke6-Aug-01 2:34
    memberJocke6-Aug-01 2:34 
    QuestionHow to use? Pin
    Anonymous31-Jul-01 22:22
    memberAnonymous31-Jul-01 22:22 
    AnswerRe: How to use? Pin
    EZUID16-Jan-03 18:49
    memberEZUID16-Jan-03 18:49 
    Questiona zip file with ASP?? Pin
    linda31-Jul-01 6:43
    memberlinda31-Jul-01 6:43 
    Generalchoosing which file is downloaded Pin
    J Koenig26-Jul-01 11:29
    memberJ Koenig26-Jul-01 11:29 
    GeneralRe: choosing which file is downloaded Pin
    Apurv13-Mar-02 2:27
    memberApurv13-Mar-02 2:27 
    GeneralRe: choosing which file is downloaded Pin
    xicoloko13-Mar-02 5:14
    memberxicoloko13-Mar-02 5:14 
    QuestionHow to find if the file was successfully downloaded? Pin
    Anonymous9-May-01 15:46
    memberAnonymous9-May-01 15:46 
    AnswerRe: How to find if the file was successfully downloaded? Pin
    Ken Dabbs14-Jun-01 4:16
    memberKen Dabbs14-Jun-01 4:16 
    QuestionHow set File Download dialog Pin
    Max A. Tkachenko5-Apr-01 5:02
    memberMax A. Tkachenko5-Apr-01 5:02 
    AnswerRe: How set File Download dialog Pin
    Ken Dabbs14-Jun-01 4:13
    memberKen Dabbs14-Jun-01 4:13 
    GeneralRe: How set File Download dialog Pin
    Dr. Bonne13-Aug-01 7:24
    memberDr. Bonne13-Aug-01 7:24 
    AnswerRe: How set File Download dialog Pin
    Anonymous25-May-02 19:12
    memberAnonymous25-May-02 19:12 
    GeneralDownloading without COM Pin
    matrix18-Mar-01 22:28
    membermatrix18-Mar-01 22:28 
    GeneralDownload Pin
    Parjeet Singh5-Feb-01 15:35
    memberParjeet Singh5-Feb-01 15:35 
    GeneralError when IIS debug mode is enabled Pin
    David Zhao25-Sep-00 8:17
    sussDavid Zhao25-Sep-00 8:17 
    QuestionWhat about file uploading? Pin
    Jake12-Sep-00 8:16
    sussJake12-Sep-00 8:16 
    AnswerRe: What about file uploading? Pin
    xicoloko12-Sep-00 10:40
    sussxicoloko12-Sep-00 10:40 
    AnswerRe: What about file uploading? Pin
    Pooja13-Jul-01 18:05
    memberPooja13-Jul-01 18:05 
    GeneralRe: What about file uploading? Pin
    bilal27-Jul-01 20:15
    memberbilal27-Jul-01 20:15 

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