Hi, Sorry to persist about this...
I'm still vexed with my mt script (it's the "action" to a form, which processes and returns text data all via a browser) and about why, depending on the number of characters submitted thru a form's submit button (textarea), stdin sometimes successfully reads in and processes the data when it's under about 1500 characters, while at othertimes stdin reads nothing if the data is over that size -- or only reads it after I've hit the form's submit button umpteen times. Most likely, this all stems from my fundamental ignorance of the http process. For example, Andu wrote back: > > #!mc > > on startup > > if $REQUEST_METHOD is "POST" then > > read from stdin until eof -- I also tried "until empty" > > There is no eof I don't think in the HTTP environment and "empty" can be > anywhere. You have to be more precise: you know there is crlf & crlf > between the header and the body so you read until you reach that point > then you must look in what you read (the header) for the "Content > Length:..." line (which your client *must* provide) and read for that > length. Hmmm... I didn't know that exactly, except for seeing it at the foot of the survey.mt script. So, any (polite!) suggestions where I could go online to get a crash course on this. And if it's not simply my ignorace, but rather something I just haven't mc-scripted correctly... help! (I hate when things work only some of the time.) Thank you. Nicolas R Cueto ---------------------------------------------------- ----- Original Message ----- From: "andu" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Monday, October 22, 2001 1:38 AM Subject: Re: stdin buffer size limit? > Nicolas Cueto wrote: > > > > Hi, > > > > The mt script below (Linux/Apache/MC2.3) successfully reads and return html > > form-data only when the form-data is short (less than 2-3 paragraphs). When > > the data is too long, a combination of several erratic behaviours can > > happen: > > > > (1) data is read in and saved integrally into two files, but is returned > > truncated > > (2) data is neither saved into the files nor returned to the browser (i.e., > > the mt-generated page is returned, but data is missing from the textarea > > form-objects) > > (3) like (2), except the returned page appears "mutilated" (i.e., snippets > > of html coding appear in the places where the missing textarea form-objects > > ought to be) > > (4) data is not saved into the files, and a completely blank page is > > returned > > > > I checked the archives, especially Scott Raney's advice in > > http://www.mail-archive.com/[email protected]/msg03228.html that: > > > > > The actual buffer size depends on the version of UNIX > > > and even on what type of descriptor is being written to > > > and what the two ends are connected to. And the > > > amount you'll get in a given "read until empty"also > > > depends on CPU scheduling and how the process on the > > > other end wrote it out. But none of this should matter > > > if you do the reads correctly. > > > > Did I do the reads correctly? > > > > Thank you. > > > > Nicolas R Cueto > > > > %%%%%%% here's that script %%%%%%%%%%%%%%%%%%% > > > > #!mc > > on startup > > if $REQUEST_METHOD is "POST" then > > read from stdin until eof -- I also tried "until empty" > > There is no eof I don't think in the HTTP environment and "empty" can be > anywhere. You have to be more precise: you know there is crlf & crlf > between the header and the body so you read until you reach that point > then you must look in what you read (the header) for the "Content > Length:..." line (which your client *must* provide) and read for that > length. > > > put it into buffer -- do I need this line? > > Buffer is just the name of a variable. > > > set the itemDel to "&" > > put item 1 of it into tRawData1 > > put item 2 of it into tRawData2 > > put urlDecode(tRawData1) into tData1 > > put urlDecode(tRawData2) into tData2 > > put tData1 into url "file:data1.txt" > > put tData2 into url "file:data2.txt" > > ## write out HTTP headers here ## > > put "Content-Type: text/html" & crlf > > put "Content-Length:" && the length of buffer & crlf & crlf > > ## write the html file ## > > -- a bunch of html here. Essentially a 3x2 table, > > -- with 2 text area form objects into which > > -- tData1 & tData2 are "put" > > end if > > end startup > > > > Archives: http://www.mail-archive.com/[email protected]/ > > Info: http://www.xworlds.com/metacard/mailinglist.htm > > Please send bug reports to <[EMAIL PROTECTED]>, not this list. > > Andu > > Archives: http://www.mail-archive.com/[email protected]/ > Info: http://www.xworlds.com/metacard/mailinglist.htm > Please send bug reports to <[EMAIL PROTECTED]>, not this list. > > Archives: http://www.mail-archive.com/[email protected]/ Info: http://www.xworlds.com/metacard/mailinglist.htm Please send bug reports to <[EMAIL PROTECTED]>, not this list.
