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Webmaster Forum / ASP / General ASP Topics / September 2008file size limit in Response.binarywrite
I am using the following code to hide the download url of files on my website. The code uses Response.Binarywrite to send file to the client. Kindly indicate the maximum size of the file that can be downloaded using this method. I am hosting this site on a public server, so I will not be able to change anything on the webserver. Kindly indicate what can be done to ensure that the above method remains valid for any file size download. call Response.AddHeader("Content-Disposition","attachment; filename=""" & strFileSave & """") Response.ContentType = "bad/type" Set Fsys = Server.CreateObject("Scripting.FileSystemObject") Set TS = Fsys.GetFile(strFile).OpenAsTextStream(1, -1) Do While Not (TS.AtEndOfStream) Response.BinaryWrite(TS.Read(1)) Loop > I am using the following code to hide the download url of files on my website. The code uses Response.Binarywrite to send file to the client. > Kindly indicate the maximum size of the file that can be downloaded using this method. [quoted text clipped - 5 lines] > Response.BinaryWrite(TS.Read(1)) > Loop Ummm...that code isn't goint to work, anyway. See the method OpenAsTEXTstream ??? You really can only use FileSystemObject reliably with text files; it wasn't designed to work with binary files. You need to use ADODB.Stream object, instead. http://msdn.microsoft.com/en-us/library/ms675032(VS.85).aspx And then you could easily control the amount you write in each chunk by just limiting the amount you Read each time. Thanks for the advice. I was under the impression that ADODB can be used only for databases. This is the first instance of using it on files. Can you please provide a sample code to hide download url by using ADODB stream, while there should be no limit on the size of files to be downloaded. . >> I am using the following code to hide the download url of files on my >> website. The code uses Response.Binarywrite to send file to the client. [quoted text clipped - 23 lines] > just > limiting the amount you Read each time. > Can you please provide a sample code to hide download url by using ADODB > stream, while there should be no limit on the size of files to be > downloaded. Good old Atrax has a couple of demos. Note that his code is written in JScript for ASP, but conversion to VBScript should be easy. http://rtfm.atrax.co.uk/infinitemonkeys/articles/asp/934.asp and http://rtfm.atrax.co.uk/infinitemonkeys/articles/asp/935.asp If you need more help, ask. I would be grateful if you can give me vbscript code as well. I would also like to clarify that the code for jscript forces save as dialog. What if we want to hide the download url but dont want to force the save as dialog, instead just want to see the pdf file within the browser window itself. Kindly advise on this. Thanks in anticipation. >> Can you please provide a sample code to hide download url by using ADODB >> stream, while there should be no limit on the size of files to be [quoted text clipped - 11 lines] > > If you need more help, ask. >I am using the following code to hide the download url of files on my >website. The code uses Response.Binarywrite to send file to the >client. [quoted text clipped - 12 lines] > Response.BinaryWrite(TS.Read(1)) > Loop Use this code:- Sub SendFileToResponse(FilePath, FileName) Const clChunkSize = 1048576 ' 1MB Dim oStream, i Response.Buffer = False Response.ContentType = "application/octet-stream" Response.AddHeader "Content-Disposition", _ "attachment; Filename=" & FileName Set oStream = Server.CreateObject("ADODB.Stream") oStream.Type = 1 ' Binary oStream.Open oStream.LoadFromFile FilePath For i = 1 To oStream.Size \ clChunkSize Response.BinaryWrite oStream.Read(clChunkSize) Next If (oStream.Size Mod clChunkSize) <> 0 Then Response.BinaryWrite oStream.Read(oStream.Size Mod clChunkSize) End If oStream.Close End Sub SendFileToResponse strFile, strFileSave Note the Response.Buffer = false allows you to send a file of any size.  SignatureAnthony Jones - MVP ASP/ASP.NET What if we want to use sendfiletoresponse but dont want to force the save as dialog, instead just want to see the pdf file within the browser window itself. is there any change required in the code to achieve this. >>I am using the following code to hide the download url of files on my >>website. The code uses Response.Binarywrite to send file to the >client. [quoted text clipped - 44 lines] > > Note the Response.Buffer = false allows you to send a file of any size. > What if we want to use sendfiletoresponse but dont want to force the save > as dialog, instead just want to see the pdf file within the browser window > itself. > is there any change required in the code to achieve this. If you know its a pdf then change content-type to application/pdf and remove the attachment; keyword from content-disposition. SignatureAnthony Jones - MVP ASP/ASP.NET Following error received: Response object error 'ASP 0157 : 80004005' Buffering On /test/dl.asp, line 2 Buffering cannot be turned off once it is already turned on. Please note that I am hosting the site on a public server so there is no way to ask the web admin to configure the server specifically for me. In such a situation is it possible to eliminate the error as indicated above. Further, if I am not able to switch off the response.buffer, will there be any limitation on the size of file that i can download using response.binarywrite? >> What if we want to use sendfiletoresponse but dont want to force the save >> as dialog, instead just want to see the pdf file within the browser [quoted text clipped - 3 lines] > If you know its a pdf then change content-type to application/pdf and > remove the attachment; keyword from content-disposition. > Following error received: > [quoted text clipped - 4 lines] > > Buffering cannot be turned off once it is already turned on. You get this error if there is anything in your page or includes at the top of the page which writes stuff to the response before your code has run. Note any static content in the page will be sent. Typical a page of this sort looks like:- <!-- #include .... some common include --> <% ' Code here that should note writing anything. 'My code I posted to you with your mods. %> Where the include is of a similar structure defininng constants and utility functions. > Please note that I am hosting the site on a public server so there is no > way to ask the web admin to configure the server specifically for me. Whilst an admin may have configured the buffer to be on (which is the default) you can set it off as long as you do so before sending anything. >In such a situation is it possible to eliminate the error as indicated >above. Further, if I am not able to switch off the response.buffer, will >there be any limitation on the size of file that i can download using >response.binarywrite? Without turning it off there will be a limitation. The is a buffer size limit that a public server administrator will almost certainly have configured (the default on IIS6 is 4MB). SignatureAnthony Jones - MVP ASP/ASP.NET Also advise the content type in case the file is an excel file, word document, exe file, zip file etc. Thanks in advance. >> What if we want to use sendfiletoresponse but dont want to force the save >> as dialog, instead just want to see the pdf file within the browser [quoted text clipped - 3 lines] > If you know its a pdf then change content-type to application/pdf and > remove the attachment; keyword from content-disposition. > Also advise the content type in case the file is an excel file, word > document, exe file, zip file etc. Try Google: mime type xxx where xxx = doc, exe etc. SignatureAnthony Jones - MVP ASP/ASP.NET Got it. But now a new problem. When I place <%Response.Buffer=False%> as the first line of my asp file, no file is downloaded and no message comes. However, when I delete the <%Response.Buffer=False%> line then the file downloads as expected. Please advise. >> Also advise the content type in case the file is an excel file, word >> document, exe file, zip file etc. > > Try Google: mime type xxx where xxx = doc, exe etc. Also I am linking the download code from another file. When I run the download code without referring to it from another file, it runs. But When I refer it from another file and it has <%Response.Buffer=False%> line, then I get the message Response object error 'ASP 0156 : 80004005' Header Error /test/dl.asp, line 114 The HTTP headers are already written to the client browser. Any HTTP header modifications must be made before writing page content. Please help >> Also advise the content type in case the file is an excel file, word >> document, exe file, zip file etc. > > Try Google: mime type xxx where xxx = doc, exe etc. I got it finally. Thanks. Just one clarification You intended For i = 1 To oStream.Size / clChunkSize or For i = 1 To oStream.Size \ clChunkSize Please clarify. > Also I am linking the download code from another file. When I run the > download code without referring to it from another file, it runs. But When [quoted text clipped - 15 lines] >> >> Try Google: mime type xxx where xxx = doc, exe etc. > Just one clarification > You intended > For i = 1 To oStream.Size / clChunkSize > or > For i = 1 To oStream.Size \ clChunkSize He *intended* the latter. The backslash operator means "integer division" in VBScript (and VB and VB.NET) code. That is, a \ b is equivalent to INT( a / b ) ******************** Also, you don't need to mess with Response.Buffer=False, at all. Just follow each Response.BinaryWrite with Response.Flush Now the buffer will never get more full than one "chunkSize". >> Just one clarification >> You intended [quoted text clipped - 22 lines] > > Now the buffer will never get more full than one "chunkSize". Yes that would work. However it would mask unintended errors that turning the buffer off right at the top of the code exposes. SignatureAnthony Jones - MVP ASP/ASP.NET >>> Just one clarification >>> You intended [quoted text clipped - 25 lines] > Yes that would work. However it would mask unintended errors that turning > the buffer off right at the top of the code exposes. what kind of errors would be exposed by turning off the buffer. kindly elaborate. >>>> Just one clarification >>>> You intended [quoted text clipped - 28 lines] > what kind of errors would be exposed by turning off the buffer. kindly > elaborate. Well the sort of problems you've discovered where you may unintentionaly be placing things in the output buffer that you didn't want present. Example:- <!-- #include /virtual="/someinclude.asp" --> <% Response.ContentType = "application/octet-stream" Do Until .... Response.BinaryWrite SomeStuff Response.Flush Loop %> 'someinclude.asp <!-- Ooops some accidental static content here --> <% 'utility code %> Placing a Response.Buffer at the top of your page would barf immediately on that line alerting you to a problem. It also saves you having to remember to Response.Flush if you have multiple places where you write to the buffer. SignatureAnthony Jones - MVP ASP/ASP.NET |
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