Re: how do I "file lock" for a form?
Hi. When a user hits "submit" many times after completeing a form, I get multiple (duplicate) entries in my spreadsheet. I've read that I can add a hidden field with a unique identifier to "lock the file" so this won't happen. I don't know how to do this - can anyone explain/direct me to a good info source (I am a newbie). Thanks, Gregg - Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software I've had this issue also, no matter how often YOU put the "ONLY click once" somebody will do it twice, or more. I found a way by using DHTML to make it so that the SUBMIT button only works ONCE, I found it on the Dynamic Drive web site here: http://www.dynamicdrive.com/ They have some excellent ways using JS to stop the problems you are having.. The only problem that you can run into, is browser levels, if the user is on an older one the code doesn't work. So if you have some controls on this, like it is a company Intranet, as here, then you can use their ideas, try to use their "Cross browser techniques". Happy coding. -- Rich Parker -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Using hex.
Thanks guys,
This is what I was looking for, more of those undocumented way to do
things. But with the way programmers "Do things" do you find there is a
"Standard" generally when it comes to dealing with hex
variables/characters??
Thanks.
zsdc wrote:
Rich Parker wrote:
$loc = index($rec, $HexValue); OR
@sub_field1 = split(/$HexValue/, $rec);
Where the $HexValue is either a variable that contains my hex'01' or
the absolute value itself.
The chr function returns the character with a given ASCII (or Unicode)
value and you can use \x01 inside of double-quoted strings, so e.g. to
have a space, you could write:
$char = chr 32;# decimal
$char = chr 0x20; # hexadecimal
$char = "\x20";# hexadecimal
$char = "\040";# octal
$HexValue = v32; # decimal
or
$string = "abc\x{20}def 123\x{20}456";
etc.
Is that what you need?
Take a look at perldata manpage:
http://www.perldoc.com/perl5.6/pod/perldata.html#Scalar-value-constructors
and Quote and Quote-like Operators in perlop manpage:
http://www.perldoc.com/perl5.6/pod/perlop.html#Quote-and-Quote-like-Operators
-zsdc.
--
Rich Parker
http://www.fssi-ca.com
mailto:[EMAIL PROTECTED]
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Re: File sizes.
On Tue, 19 Aug 2003 14:20:47 -0700, Rich Parker <[EMAIL PROTECTED]> wrote: Hi, I have been watching the thread about the file::copy. I ran into an issue in the Linux environment that brings a serious question, MAX file size. Keep in mind the server is running 7.0 RH, we have 7.2 Enterprise Server also, and we pay for support. But even the RH support says they can't handle files in excess of 2GB (approx). I was using TAR, GZIP, or most any functions, I have found that the targeted file is only 1.8GB instead of being a much larger file, in our case 16GB. This was on a "/mnt" device, not a local disk. So the COPY (TAR in this case) was from one "/mnt/" device to another, it did not matter if I used TAR, COPY, MOVE, or a Perl program, same problem. Everyone I talked to about this on the various "Groups" only said "Rebuild the kernel using 64 bit support", but this is on an Intel box (32 bit?). Have any of YOU seen this problem? I can't be the only person dealing with large files. Ideas?? How is this issue on later releases?? I am no kernel hacker so take what I say with a grain of salt. The large file size has to do with the addressable space on the disk which to support over 2 gigs you need more "bits" to produce longer addresses, which is I believe why they suggested you add 64 bit support. Its been a while since I was doing kernel builds but I thought there was a specific switch for "large file size", but I thought this was specifically to support partitions of larger than 2 GB not files themselves, but maybe they are one in the same. Now you mention that the file is 1.8 GB, is that machine readable or human readable, aka is that where 1 KB = 1000 bytes or 1024 bytes? It is likely that your file exceeds the 2 GB boundary if the 1.8 is human readable. I am not sure about copy, theoretically it should work if the file can be addressed completely, move won't work accross file system boundaries anyways, nor will a 'rename' in Perl. Again because Perl is talking to the underlying kernel theoretically you would need large file support in the kernel first, but then you *ALSO* need it in the 'perl' (not Perl) executable. For instance, perl -V will have something near the bottom like: Compile-time options: ... USE_LARGE_FILES ... Though I am also not a Perl internals hacker so I don't know what all this adds, but I suspect it is needed in your case if you do use a Perl script. To my knowledge this has been fixed in 2.4 or newer kernels (are you running 2.2?), or it was fixed by default from the jump from RH 7.x to RH 8.0. Maybe one of the real gurus can provide better explanation/help... In any case you may get better help asking on a Linux kernel list... http://danconia.org You have a very good point, I've seen that "LARGE_FILES" thing in the set up, however, the people at RedHat said not to do that, but rather wait for the next release of the 2.4 kernel, at that time (About 6 months ago) 2.4 was real "Buggy" according to them. Yet the current "Advertised" release of RH is 9.0!! Which makes me wonder about it, the stuff you can pay "Support" for is way back on the release scale. Here at work we also have a S/390 running VM and I've been trying to get the "Powers at be" to allow me to use the Linux and all of the things that go with that, gee, like PERL, but it has been a real up hill battle. If any of you can give me a GREAT reason to help me convince them, then I'm "All ears". I can see the "Bennies" of having a whole bunch of servers on ONE box, but it's very difficult to get them to the next step, $30K for TCP/IP for VM, which we would need. But then that 2GB limit hits me square in the face again. To answer your question about the 1.8, YES, when I use ANY piece of software, or do an LS, for example, it only shows 1.8GB when on the WinNT machine where the files sits, it shows 16GB, for example. Didn't matter which piece of software or what "command" I was using. I don't think I would see this if I was using Perl in a Win32 arena, but with all of the troubles I had pushing huge amounts of SQL data through the cgi interface, I had to abandon the Win32 for the more stable and less "Buggy" Linux, but then I ran into the 2GB limit. Looks like WE have to wait until the Enterprise edition gets the newer kernel, agreed? But I HATE waiting... Cal me impatient... Thanks... -- Rich Parker -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: File sizes.
Hi, I have been watching the thread about the file::copy. I ran into an issue in the Linux environment that brings a serious question, MAX file size. Keep in mind the server is running 7.0 RH, we have 7.2 Enterprise Server also, and we pay for support. But even the RH support says they can't handle files in excess of 2GB (approx). i believe RH 7.1 beta r1 (code name Fisher) which uses kernel 2.4.0 is the first RH that supports the LFS (Large File Support) extension. your server running 7.0 won't be able to address > 2GB file. If you have 7.2 Enterprise, why don't you use that instead? If you pay for support, isn't RH suppose to provide help / instruction on how to get your 7.0 with LFS support? if you simply want to know if Perl is able to deal with > 2GB file, you can: [panda]$ perl -V | grep 'uselargefiles' and you should see something like: uselargefiles=define to see that if perl (the binary) is compiled to use LFS API, use: [panda]$ perl -V | grep 'OFFSET_BIT' and if you see something like: D_GNU_SOURCE -fno-strict-aliasing -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 you are in good shape. the easiest solution to get LFS support is to upgrade your 7.0 imo. david David, Thanks for the observations. But the point that RH made to me (Again, about 6 months ago) was that this issue was in 7.0-7.2 and YES, they did not recommend rebuilding the kernel because at THAT time the 2.4 was "Buggy" in their opinion. I am not so worried about Perl being able to READ/WRITE or what ever for large files, but the O/S has to be able to do this first, correct? That's my main point and the obstacles I've run into on this. It seems like to me, it is time to revisit this with the RH folks to see what THEY say about it, then go through the pain of upgrading a server with a ton of perl code on it, of course, everything must be TESTED to make 100% sure I haven't dropped anything through the cracks. Thankx... -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Using hex.
Howdy, I use many different languages here at work, from Assembly, Rexx, to other mainframe languages. One thing I find it difficult to do with Perl is the handling of Hex characters. This may seem like a very generalized question, forgive me for trying to find a "Better way to do it". Picture having a flat file, or an SQL table (Doesn't matter that much), I want to delimit a field within a field, like having options. I can't use the TAB (\t) character, because when I use the "foreach" the sub fields also get "Split", therefore loosing what I am attempting to do. So I wanted to use a hex character, let's say something simple, hex'01' for example. What do you guys use for saying something like: $loc = index($rec, $HexValue); OR @sub_field1 = split(/$HexValue/, $rec); Where the $HexValue is either a variable that contains my hex'01' or the absolute value itself. I've used 'sprintf' to limited success, but in other languages this is very simple. I'm looking for some different ways to do this, after all, that's what Perl is all about right? TIMTOWTDI... What's some of your things you guys use?? Thanks, ahead of time. -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Executable perl program help!!
[EMAIL PROTECTED] wrote:
Also try
http://www.indigostar.com/
Laurent coudeur
Quick question about this, sounds great. But if I were running my Perl
from an http call (Normal browser usage), what would the "exec cgi" call
"Look like", syntax wise??
Thanks.
Bob Showalter <[EMAIL PROTECTED]>
20/08/2003 16:20
To: "'Rich Parker'" <[EMAIL PROTECTED]>, [EMAIL PROTECTED]
cc:
Subject: RE: Executable perl program help!!
Rich Parker wrote:
I was at Active State the other day, they have one that can be
purchased. I have seen a few others when I did a similar search as
mentioned. I haven't seen one for free or one that has a demo for it,
I'd love to try one, if anyone sees one, let everyone know about it.
You can download a demo version of ActiveState's Perl Dev Kit:
<http://www.activestate.com/Products/Download/Register.plex?id=PerlDevKit&a=
e>
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Re: Executable perl program help!!
I was at Active State the other day, they have one that can be purchased. I have seen a few others when I did a similar search as mentioned. I haven't seen one for free or one that has a demo for it, I'd love to try one, if anyone sees one, let everyone know about it. Thanks. Ramprasad A Padmanabhan wrote: [EMAIL PROTECTED] wrote: How can i generate such a file? Million dollar question , No perfect answer. Depends on what OS you are using. Do a google on perl2exe For starters try the O.pm. To convert your perlcode to C and then compile the C code On linux You can compile using export LDOPTS=`perl -MExtUtils::Embed -e ldopts` export CCOPTS=`perl -MExtUtils::Embed -e ccopts` perl -MO=C script.pl > script.c gcc $CCOPTS script.c -o script $LDOPTS This works only on some scripts. The O.pm is still evolving Ram -- Rich Parker http://www.fssi-ca.com mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
File sizes.
Hi, I have been watching the thread about the file::copy. I ran into an issue in the Linux environment that brings a serious question, MAX file size. Keep in mind the server is running 7.0 RH, we have 7.2 Enterprise Server also, and we pay for support. But even the RH support says they can't handle files in excess of 2GB (approx). I was using TAR, GZIP, or most any functions, I have found that the targeted file is only 1.8GB instead of being a much larger file, in our case 16GB. This was on a "/mnt" device, not a local disk. So the COPY (TAR in this case) was from one "/mnt/" device to another, it did not matter if I used TAR, COPY, MOVE, or a Perl program, same problem. Everyone I talked to about this on the various "Groups" only said "Rebuild the kernel using 64 bit support", but this is on an Intel box (32 bit?). Have any of YOU seen this problem? I can't be the only person dealing with large files. Ideas?? How is this issue on later releases?? THanks. -- Rich Parker -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: New to list, question.
Very interesting reading, Thanks, Actually, it "Could be" great reading to "Sleep by". But I have a concern about all of this, be that a MS "Controlled" .NET or even an "OPEN source" Mono. Who is going to "control" where all of this resides? Let's take the MS idea of .NET for a moment, remember WHEN the Justice dept tried to "Go after" MS because they had too much control of things? Regardless of my personal opinions on this (Bill who?) doesn't this whole idea give Mr. Gates more of the opportunity that IF anyone tries "That" again, the HE could "Pull the plug" and everyone who is using .NET now can't make their programs run? Isn't that a REAL possibility? Or let's look at it from the OPEN Source side, if ALL of this "common code" (For lack of a better word right now) was at one or a "Handful" of sites, and let's just say there was a "Power outage" (Remember the great power outage of 2003?), then what? The rest of us are still working, but WE can't access the needed files to make our Internet or Intranet sites work, so now we start having a cascade failure of the NET (No DOT here, everyone). From a company perspective, the concept of .NET is wonderful, as long as "Our source code" is just that, "OURS". But from the poor guy who suddenly NOW has to pay MS (Back to .NET again) a monthly fee just to OPEN a Word Doc, I don't see the public going for that. Do I have this wrong? Don't tell me Mr. Gates is going to keep the basic modules for MS-Word free for everyone?? Yea right. I'm just concerned, that's all, I love the idea of "Every developer" getting his "Fair share" for the bits & pieces he creates, and YES, we are NOT reusing our code enough, but is THIS the correct solution?? Anyone got anymore links for me? I noticed that when I did that search on the "de icaza .net" (without the quotes, duh?) that the TOP article was on O'Reilly, I like their books, don't get me wrong, but will they publish someone else's "Point of view", even though de Icaza seems like a "Sharp cookie" and admittedly, this is this first time I've heard of him. I'd like to hear what others have to say. I've been developing Perl based web sites for a long time, what I've always liked about it was/is the fact that it actually works and it's included with the O/S's like Linux (Ok, use the word - FREE) and I just feel that if Bill gets His way, that we'll all loose out on the word FREE. Now if this idea was like a "Newsgroup" where the various news servers got reloaded from time to time and the code wasn't just in ONE spot, I might be willing to really support it, but the more I learn about this, the more questions I have. Somebody HELP me understand why this is the NEXT thing in software. I just don't get it. Thanks. McMahon, Christopher x66156 wrote: I'll take this a step further. Search Google for "de icaza .net". Miguel de Icaza produced the GNOME desktop and founded Ximian/Mono. He's quoted all over the place discussing what .NET has to offer beyond the MS arena, for Open Source and wide interoperability. I think that de Icaza explains .NET better than Microsoft has... at least from a developer's point of view. ActiveState has a Perl environment "Visual Perl" that seems to be capable of interacting in a .NET sort of way with other .NET languages, which is pretty cool. .NET is worth investigating if for no other reason than that it seems to be the MS answer to Sun's Java *and* IBM's WebSphere. And it has a lot of room to grow. I'm interested because I just got a job with an all-Windows shop migrating apps from C++ to .NET. Except for Windows workstations and a little bit of MS ODBC, all my professional experience has been on Tandem, Solaris, and AIX. I hope .NET is as cool as de Icaza says it is, because Windows kinda creeps me out. It's just very weird having all of that abstraction/secret code between me and what the OS is doing. -Chris -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Monday, August 18, 2003 1:45 PM To: Rich Parker; [EMAIL PROTECTED] Subject: RE: New to list, question. On Mon, 18 Aug 2003 12:40:02 -0700, Rich Parker <[EMAIL PROTECTED]> wrote: Hi, I've been involved with Perl for many years (too many to count right now). One question has been bugging me lately, and maybe it's because I don't know enough about it, or maybe it's because I've been "Not the biggest fan" of Mr. Bill and his org... Either way, I'm attempting to learn about .NET (Don't pani
New to list, question.
Hi, I've been involved with Perl for many years (too many to count right now). One question has been bugging me lately, and maybe it's because I don't know enough about it, or maybe it's because I've been "Not the biggest fan" of Mr. Bill and his org... Either way, I'm attempting to learn about .NET (Don't panic here, I'm just looking for some information). Mainly, how does, or can the .NET framework be of benefit to the Perl developer at large? Am I going to get any "Bang for my buck" using Perl in the .NET environment? But WAIT, I'm working on Linux Systems, how does that effect what I am asking?? If someone could provide me a link to some articles about .NET from many different perspectives, preferably NOT by MS (If you catch my drift here). I want to see if this framework is going to be something of use to me. Thanks for ANY help you can provide. -- Rich Parker -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
