473,890 Members | 1,193 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

HTTP headers ? How to pipe an ASP file through ?

Hi Guys,

I have a problem, and I would be grateful for any help.

My WebApp has to do some database work in page1.ASP Because this may
take a few second, before Page1 connects to the database, it doeas a
"Response.Buffe r=false", and pumps out a bit of javascript which
displays a progress bar.

SO far so good.

When the database call is completed, I then write out a bit more
javascript to stop the progress bar.

Now, I have a binary fields retrieved from the database, which needs to
be written like this :

<%
Response.Conten tType = "applicatio n/pdf" [error]
response.Binary Write (mydatabase field)
%>

Of course I am getting an error about HTTP headers having been written
already.

Can anyone suggest a way that I can display this PDF from Page1.asp ?
At the moment, one I have done the database work (which populates the
database) I have to transfer to PAGE2.ASP which then has to open the
database, and retrieve the field again. The problem is that this
process takes a few seconds too, which also requires the progressbar
!!!!!

What I would like to do, (if it's possible) is something like this :

PAGE1.ASP
<%
....[code to intialise progressbar]...
....[database call]...
....[clear progress bar]...
....[write db field as PDF]...
%>

thanks in advance

Jul 11 '06 #1
2 1807

<je*******@hotm ail.comwrote in message
news:11******** **************@ b28g2000cwb.goo glegroups.com.. .
Hi Guys,

I have a problem, and I would be grateful for any help.

My WebApp has to do some database work in page1.ASP Because this may
take a few second, before Page1 connects to the database, it doeas a
"Response.Buffe r=false", and pumps out a bit of javascript which
displays a progress bar.

SO far so good.

When the database call is completed, I then write out a bit more
javascript to stop the progress bar.

Now, I have a binary fields retrieved from the database, which needs to
be written like this :

<%
Response.Conten tType = "applicatio n/pdf" [error]
response.Binary Write (mydatabase field)
%>

Of course I am getting an error about HTTP headers having been written
already.

Can anyone suggest a way that I can display this PDF from Page1.asp ?
At the moment, one I have done the database work (which populates the
database) I have to transfer to PAGE2.ASP which then has to open the
database, and retrieve the field again. The problem is that this
process takes a few seconds too, which also requires the progressbar
!!!!!

What I would like to do, (if it's possible) is something like this :

PAGE1.ASP
<%
...[code to intialise progressbar]...
...[database call]...
...[clear progress bar]...
...[write db field as PDF]...
%>
The request should ultimately return a PDF. Since a PDF doesn't begin with
Javascript code you've corrupted the download before you have even begun.

One thing you might try is an accessor page which launches a modeless dialog
containng your progress bar then navigates to the page that delivers the
PDF. The when the PDF starts to download the internal window containing
your accessor page will be closed to be replaced with the PDF at this point
the modelss dialog will be closed automatically for you.

I'm not sure how this would work in a non-IE environment though.
thanks in advance

Jul 11 '06 #2
Not sure if this follows your business rules, but what I've done in the past
is create an actual PDF file in a temp virtual directory, and then have the
page that created the file redirect to that file. If the information is
sensitive, make sure you have some sort of cleanup routine (possibly
triggered when a session ends).

"je*******@hotm ail.com" wrote:
Hi Guys,

I have a problem, and I would be grateful for any help.

My WebApp has to do some database work in page1.ASP Because this may
take a few second, before Page1 connects to the database, it doeas a
"Response.Buffe r=false", and pumps out a bit of javascript which
displays a progress bar.

SO far so good.

When the database call is completed, I then write out a bit more
javascript to stop the progress bar.

Now, I have a binary fields retrieved from the database, which needs to
be written like this :

<%
Response.Conten tType = "applicatio n/pdf" [error]
response.Binary Write (mydatabase field)
%>

Of course I am getting an error about HTTP headers having been written
already.

Can anyone suggest a way that I can display this PDF from Page1.asp ?
At the moment, one I have done the database work (which populates the
database) I have to transfer to PAGE2.ASP which then has to open the
database, and retrieve the field again. The problem is that this
process takes a few seconds too, which also requires the progressbar
!!!!!

What I would like to do, (if it's possible) is something like this :

PAGE1.ASP
<%
....[code to intialise progressbar]...
....[database call]...
....[clear progress bar]...
....[write db field as PDF]...
%>

thanks in advance

Aug 31 '06 #3

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

2
2849
by: Martin Kofahl | last post by:
Hello, I'm slightly confused with the passthru() command. The program I call writes html headers itself. However, passthru() makes apache sending some generated headers first. There's no fault with spaches in the code etc, I think. Here's an simplified example: $ cat /www/example.php <?
1
6040
by: Brad Murdoch | last post by:
im trying to run the select.selct() on a unix pipe, my expectation is that it will block untill there is something there to read, then continue. It seems to do this untill the pipe is written to once, then i get a busy while loop. shouldnt this stop each time, to wait for something to be written to the pipe. obviously im a novice when it comes to python programming, what am i missing here. cheers..
5
17428
by: richard | last post by:
I have a simple test to pass information from a client to a server using named pipe. what I really want is: when I type a line on the client, the server will output the line immediately. but to my surprise, I always have to terminate the client to get the server in action, i.e. prints out what I typed. anything I missed? I am compiling using gcc without any option. thanks, ---RICH
15
4199
by: Dave | last post by:
Hello NG, It is well known that memory-allocating definitions should not be put in a header file. I believe, however, that this does not apply to const definitions. For example: #ifndef MY_HEADER #define MY_HEADER const int FOO = 42;
6
1910
by: Chapman Flack | last post by:
Ok, I've registered all the right headers to send, with header( 'Content-Type: .../...') etc. The next thing to do is exec a program that will be producing the actual content. The content MUST begin immediately after the headers (that is, after the single empty line that separates the headers from the body). PHP won't seem to send the headers unless I tell it to print something. I tried printing an empty string print(''); - still...
7
3712
by: Greg | last post by:
I am trying to implement the UNIX pipe command using C but with the "->" operator. Everything works fine with 1 pipe, but when I try to use 2 or more, it hangs up when reading the pipe_in filestream. If ANYONE could offer ANY suggestion as to why this is happening it would be much appreciated. Thanks in advance!
4
7848
by: bill | last post by:
I am confused by the behavior of the following code. The function copy() takes two FILE *'s and copies the data from one to the other. In the main routine, I create a pipe and copy stdin to the write end while copying the read end to stdout. If the child handles copying the read end of the pipe to stdout, the main program returns. If the child handles copying stdin to the write end of the pipe, the parent hangs in copy(), blocking on...
11
21539
by: 7stud | last post by:
Hi, Can someone explain what a broken pipe is? The following produces a broken pipe error: ---------- import subprocess as sub p = sub.Popen(, stdin=sub.PIPE, stdout=sub.PIPE)
1
2903
by: Max58kl | last post by:
Hi I am trying to setup a form that automatically sends the form values via email to a specific address. I have uploaded the script, which when I run loads a page with the following error message: CGI Error The specified CGI application misbehaved by not returning a complete set of HTTP headers. According to the tutorial I am using the only thing I needed to change was the
0
9978
marktang
by: marktang | last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look ! Part I. Meaning of...
0
10814
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth. The Art of Business Website Design Your website is...
1
10922
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
0
9630
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own.... Now, this would greatly impact the work of software developers. The idea...
0
7169
by: conductexam | last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one. At the time of converting from word file to html my equations which are in the word document file was convert into image. Globals.ThisAddIn.Application.ActiveDocument.Select();...
0
5849
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols. I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
0
6041
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
1
4676
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
3
3276
bsmnconsultancy
by: bsmnconsultancy | last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.