Re: Deleted Files
Too little information. I can think of at least one way: Volume Corruption. I can think of another way: File was not saved where you thought it was saved. Yet another way: User or app appears to have saved the file but in reality, didn't. Bob On Jun 2, 2010, at 9:02 AM, Dan Friedman wrote: Hey... I am writing compressed XML data to file on a server using the put command. Every now and then, I get a report from a user that when they go to read the data, they are getting an error. When I look on the server, the file is gone! Not empty, not zero K... just gone - nonexistent! Let's assume for a moment that the file was there to begin with, and there is no one messing with the data and secretly deleting things. It must be something in my app that is causing this. But, what could it be? Nowhere am I deleting a file. Can anyone think of a way you could delete a file without actually deleting it? I tried: put compress() into url x I thought that compressing empty might do something funny. But it didn't, it just wrote some gargly-goop. ANY thoughts out there?? Thank you in advance, Dan___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
Re: Deleted Files
Bob, Thank you VERY much for the insight. I really need some help resolving this problem. However Volume Corruption On one file only? I suppose that possible, but I think it's pretty unlikely. File was not saved where you thought it was saved. Then why would the original file have been deleted? User or app appears to have saved the file but in reality, didn't. Again, why would the original file have been deleted? -Dan On Jun 2, 2010, at 10:00 AM, use-revolution-requ...@lists.runrev.com wrote: Too little information. I can think of at least one way: Volume Corruption. I can think of another way: File was not saved where you thought it was saved. Yet another way: User or app appears to have saved the file but in reality, didn't. Bob On Jun 2, 2010, at 9:02 AM, Dan Friedman wrote: Hey... I am writing compressed XML data to file on a server using the put command. Every now and then, I get a report from a user that when they go to read the data, they are getting an error. When I look on the server, the file is gone! Not empty, not zero K... just gone - nonexistent! Let's assume for a moment that the file was there to begin with, and there is no one messing with the data and secretly deleting things. It must be something in my app that is causing this. But, what could it be? Nowhere am I deleting a file. Can anyone think of a way you could delete a file without actually deleting it? I tried: put compress() into url x I thought that compressing empty might do something funny. But it didn't, it just wrote some gargly-goop. ANY thoughts out there?? Thank you in advance, Dan ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
Re: Deleted Files
After reading a bit more of your original post, I think I understand that you are creating an XML file each time you do a PUT? If so, are you PUTTING to the same file name each time? If so, then if the command fails for some reason the file system would delete the original, and then the new file, having failed would never get to the server. It might be better to rename the original, PUT the new XML file, verify the existence of the file after PUTTING it, then delete the old one. I'm curious why you are using this command and not the low level file commands: open file read from file write to file close file Bear in mind I'm not an expert on low level file commands. I am simply curious about your method. Bob On Jun 2, 2010, at 10:32 AM, Dan Friedman wrote: Bob, Thank you VERY much for the insight. I really need some help resolving this problem. However Volume Corruption On one file only? I suppose that possible, but I think it's pretty unlikely. File was not saved where you thought it was saved. Then why would the original file have been deleted? User or app appears to have saved the file but in reality, didn't. Again, why would the original file have been deleted? -Dan On Jun 2, 2010, at 10:00 AM, use-revolution-requ...@lists.runrev.com wrote: Too little information. I can think of at least one way: Volume Corruption. I can think of another way: File was not saved where you thought it was saved. Yet another way: User or app appears to have saved the file but in reality, didn't. Bob On Jun 2, 2010, at 9:02 AM, Dan Friedman wrote: Hey... I am writing compressed XML data to file on a server using the put command. Every now and then, I get a report from a user that when they go to read the data, they are getting an error. When I look on the server, the file is gone! Not empty, not zero K... just gone - nonexistent! Let's assume for a moment that the file was there to begin with, and there is no one messing with the data and secretly deleting things. It must be something in my app that is causing this. But, what could it be? Nowhere am I deleting a file. Can anyone think of a way you could delete a file without actually deleting it? I tried: put compress() into url x I thought that compressing empty might do something funny. But it didn't, it just wrote some gargly-goop. ANY thoughts out there?? Thank you in advance, Dan ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
Re: Deleted Files
Dan Friedman wrote: File was not saved where you thought it was saved. Then why would the original file have been deleted? User or app appears to have saved the file but in reality, didn't. Again, why would the original file have been deleted? libURL uses the STOR FTP command to post files. I know that when a file already exists at the specified location the new file will overwrite it, but I'm not clear on the exact sequence of actions it will use to do so. It may be that the original file is deleted by the FTP server immediately before the new file is written, and if that's the case there may be a problem with the FTP server in question or the data transfer to it which is allowing the first action (delete) to take place without being followed by the second (write). Your client-side logs from libURL won't be able to help you, but there may be some diagnostics that can be done by a tech on the server side to see those specifics. -- Richard Gaskin Fourth World Rev training and consulting: http://www.fourthworld.com Webzine for Rev developers: http://www.revjournal.com revJournal blog: http://revjournal.com/blog.irv ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
Re: Deleted Files
Bob, I am using the put because I am writing to a ftp web server. So I need to pass a username and password. How would I rename the file on a remote server? Also, how would you suggest I go about this? I could end up in a endless error check... rename the original file write the data if error then rename the original file back if error then then what? What do you think? -Dan After reading a bit more of your original post, I think I understand that you are creating an XML file each time you do a PUT? If so, are you PUTTING to the same file name each time? If so, then if the command fails for some reason the file system would delete the original, and then the new file, having failed would never get to the server. It might be better to rename the original, PUT the new XML file, verify the existence of the file after PUTTING it, then delete the old one. I'm curious why you are using this command and not the low level file commands: open file read from file write to file close file Bear in mind I'm not an expert on low level file commands. I am simply curious about your method. Bob Thank you VERY much for the insight. I really need some help resolving this problem. However Volume Corruption On one file only? I suppose that possible, but I think it's pretty unlikely. File was not saved where you thought it was saved. Then why would the original file have been deleted? User or app appears to have saved the file but in reality, didn't. Again, why would the original file have been deleted? ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
Re: Deleted Files
Sorry Dan I missed the remote aspect of things. I was thinking you were on a local area network using a file share. I believe there are FTP commands to rename files. I'm not certain though. Assuming you can, it is doubtful an FTP server would allow the first file rename but not the second, should the new write fail. Also, doesn't the FTP server respond if there is an error with the command? I mean, you can never completely guarantee a remote site will still be there a split second later, but I think it would go more like this (pseudo wise): open connection check result if ok, see if file exists with same name as the one you are going to write if it does, rename the old file check the result if ok, write new file check the result if ok, delete renamed file if error anywhere either reconnect and try again, or bail out. At least you will have the renamed file sitting there in the odd circumstance that there was a disconnect. You can have a repeat loop that tries x number of times, that exits if everything works or the counter gets to x. And you would be able to tell if your SEND command was actually failing, because you would have a renamed file, but no new file. Bob On Jun 2, 2010, at 3:08 PM, Dan Friedman wrote: Bob, I am using the put because I am writing to a ftp web server. So I need to pass a username and password. How would I rename the file on a remote server? Also, how would you suggest I go about this? I could end up in a endless error check... rename the original file write the data if error then rename the original file back if error then then what? What do you think? -Dan ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
Re: Deleted Files
Dan Friedman wrote: How would I rename the file on a remote server? libURL does it's magic with FTP, and FTP does its magic with a set of commands available for the protocol, including two for renaming files: http://www.nsftools.com/tips/RawFTP.htm#RNFR Thankfully, Dave Cragg opens the door to use any of them with the libURL call libUrlFtpCommand - e.g., to rename a file: get libUrlFtpCommand(RNFR mydomain.com/file.dat,\ myserver.com,myFtpLogin,myPassword) get libUrlFtpCommand(RNTO mycomain.com/newname.dat,\ myserver.com,myFtpLogin,myPassword) Wonderfully detailed notes on everything in libURL here: http://www.lacscentre.com/liburl/liburldoc.html -- Richard Gaskin Fourth World Rev training and consulting: http://www.fourthworld.com Webzine for Rev developers: http://www.revjournal.com revJournal blog: http://revjournal.com/blog.irv ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
Re: Deleted Files
On Thu, Jun 3, 2010 at 1:47 AM, Bob Sneidar b...@twft.com wrote: I'm curious why you are using this command and not the low level file commands: open file read from file write to file close file Bear in mind I'm not an expert on low level file commands. I am simply curious about your method. There could be two reasons. Firstly this Tip at the bottom of the Dictionary entries for the above 4 commands: Tip: As an alternative to the open file, read from file, and write to filecommands, you can also use the URLkeyword with get, put, and other commands to access the contents of a file. Personally, if it's a Tip, it suggest to me that it's a better way to do something. My understanding by using 'put someData into URL ftp://www.mySite.net' you avoid the need to open and close a file, plus, as mentioned, you get to work with servers. Additionally, you avoid this problem, as mentioned in the dictionary: Important: before opening any file for writing to, remember to back up the file contents as Revolution will erase them even if you don't write to the file after opening it. Does seem important. ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
