Files not updating in folder

I have a HTML application that interfaces to my Hauppage WinTv card. This HTML app takes a snapshot of 3 different channels at approximately 30 second intervals and saves the snapshot to a jpeg file in a selected folder. The jpeg files will be replaced by more current files for the first 10 minutes the app is running. But eventually, the snapshots in the folder will NOT be replaced by more current snapshots. But if I open a command prompt to the folder storing the jpeg files and do a DIR command several times, the current files start to be replaced by the latest snapshot.

Thus, I have to execute DIR commands every so often in the folder to force the jpeg files to be updated.

Can anybody help me resolve this file update problem?

thanx

Bob

Umm... running a directory command on the folder will not do anything, unless you need to update the listing for some program to read it, in which case I'd imagine you'd get a directory listing before you try to grab any files.

Again, I don't fully understand the problem, so maybe you could explain it a little better?!

My HTML app is writing three jpeg files to one directory. File 1 is written after 30 seconds, file 2 is written after 60 seconds and file 3 is written after 90 seconds. Then at 120 seconds, file 1 is written to the directory, overwriting the original file 1 at 150 seconds file 2 is written to the directory, overwriting file 2 etc. Let's say I start the app at 15:00 and check the app at 18:00, I will find that the time stamps for the three files are at around 16:10 even though the HTML app indicates that a file is being written every 30 seconds. Now if I open up a command prompt and go to the destination directory (where the JPEG files are being written to) and do a DIR command a few times, the time stamp on the JPEG files will start to change to 18:00 indicating that the directory is now again getting updated files every 30 seconds. The 30 second updating of each file will continue for about an hour and then the files are no longer updated in the directory EVEN though the app indicates that files are written every 30 seconds. Now I again open a command prompt and do a DIR a few times and AGAIN the time stamps on the files start changing again.

It sounds to me like either your app isn't working correctly or your filesystem is taking a poop after a certain period. Is there anyway to reset your app after each image creation? I would assume that you're eating memory.

And just as a technical note, an "HTML app" is incorrect usage since HTML alone cannot create/manage jpeg files. You're probably using a scripting language like Perl/PHP/Javascript.

Can you show us the code? And how are you running the script? Crontab? Windows Task Scheduler? Javascript timer?

I'm using javascript in HTML. Listed below is the complete code. I modified an example from Hauppage to just display channels 75, 77 and 79

Code:

<HTML> <HEAD> <style type="text/css"> P { margin-top:2px;} FORM { margin-bottom:1px;} </style> <SCRIPT LANGUAGE="JavaScript" FOR="window">  </SCRIPT> <TITLE>WinTV window</TITLE> </HEAD> <BODY bgcolor="#A0A0A0" text="#000000" topmargin="4" leftmargin="4" NAME="bdy" onUnload="save_to_cookie()" > <TABLE ID="tbl2" BORDER="0" CELLSPACING="0" CELLPADDING="5" bgcolor="#A0A0A0"> <TR> <TD COLSPAN=3 NOWRAP> <P align="center"> <FORM NAME="frm1"> <INPUT TYPE=button VALUE="Folder:" NAME="button_folder" TITLE="Open folder" onClick="open_folder(form.field_folder.value)">  <INPUT TYPE="text" TITLE="Enter name of existing folder" NAME="field_folder" SIZE="35" onChange="read_form1(this.form)" onfocus="disable_hotkeys()" onBlur="enable_hotkeys()"> File: <INPUT TYPE="text" TITLE="Enter first part of the filename" NAME="field_filename" SIZE="8" onChange="read_form1(this.form)" onfocus="disable_hotkeys()" onBlur="enable_hotkeys()"> + <SELECT NAME="filename_fmt" onChange="read_form1(this.form)" onfocus="disable_hotkeys()" onBlur="enable_hotkeys()"> <OPTION SELECTED>date_time <OPTION>time <OPTION>counter <OPTION>  </SELECT> <SELECT NAME="fileformat" onChange="read_form1(this.form)" onfocus="disable_hotkeys()" onBlur="enable_hotkeys()"> <OPTION SELECTED>JPG <OPTION>PNG <OPTION>BMP </SELECT> </FORM> <P> </TD> </TR> <TR valign=top> <TD> <P> <FORM NAME="frm2"> <P align="right"> <INPUT TYPE=button VALUE="Color" TITLE="Open color settings dialog" NAME="button_color" onClick="TVcolordialog()"> <P align="right"> <SELECT NAME="videowidth_selector" onChange="read_form2(this.form);videoheight=find_height(videowidth);init_form2(this.form);TVsize(videowidth,videoheight)" onfocus="disable_hotkeys()" onBlur="enable_hotkeys()"> <OPTION SELECTED>320 <OPTION>352 <OPTION>384 <OPTION>576 <OPTION>640 <OPTION>720 <OPTION>768 </SELECT> <P align="right"> <SELECT NAME="videoheight_selector" onChange="read_form2(this.form);TVsize(videowidth,videoheight)" onfocus="disable_hotkeys()" onBlur="enable_hotkeys()"> <OPTION SELECTED>240 <OPTION>288 <OPTION>432 <OPTION>480 <OPTION>576 </SELECT> <P align="right"> <INPUT TYPE=button VALUE="Vol ↑" NAME="button_volume_up" TITLE="Volume up" onClick="TVvolume_up()"> <P align="right"> <INPUT TYPE=button VALUE="Vol ↓" NAME="button_volume_dn" TITLE="Volume down" onClick="TVvolume_dn()"> <P align="right"> <INPUT TYPE=button VALUE="Mute" NAME="button_mute" TITLE="Mute on/off" onClick="TVtogglemute2()"> <P align="right"> <INPUT TYPE=button VALUE="Close" TITLE="Close window" onClick="close_window()"> <P align="right"> <INPUT TYPE=button VALUE="Reload" TITLE="Reload page" onClick="location.reload();window.focus()"> <P align="right"> <INPUT TYPE="checkbox" NAME="preview_checkbox" VALUE="on" TITLE="Enable preview of saved image" onChange="read_form2(this.form)" onfocus="disable_hotkeys()" onBlur="enable_hotkeys()"> Preview </FORM> <P> </TD> <TD> <P align="center"> <OBJECT ID="WinTVocx1" WIDTH=320 HEIGHT=240 CLASSID="CLSID:41F3F2F6-0ABE-11D8-BEB2-00A0C9F21FC7" CODEBASE="hcwWinTV.ocx"></OBJECT> </TD> <TD> <P> <FORM NAME="frm3"> <P> <INPUT TYPE=button VALUE="Suite" NAME="button_suite" TITLE="Open Channel Manager" onClick="TVsuite()"> <P> <INPUT TYPE=text VALUE="" NAME="channel_field" TITLE="Current tuner channel" SIZE=3 READONLY> <P> <INPUT TYPE=button VALUE="Channel ↑" NAME="button_channel_up" TITLE="Channel up" onClick="TVchannelup2()">  <P> <INPUT TYPE=button VALUE="Channel ↓" NAME="button_channel_dn" TITLE="Channel down" onClick="TVchanneldn2()">  <P> <INPUT TYPE=button VALUE="Freeze" NAME="button_freeze" TITLE="Freeze / Unfreeze image" onClick="TVtogglefreeze2()"> <P> <INPUT TYPE=button VALUE="Save As" NAME="button_save_as" TITLE="Save image as..." onClick="TVsavetodisk()"> <P> <INPUT TYPE=button VALUE="Save" NAME="button_save" TITLE="Save image" onClick="save(folder, filename, fileformat, quality, filename_fmt_desc)"> <P> <INPUT TYPE=button VALUE="AutoSave" NAME="button_autosave" TITLE="Start / Stop auto saving of images" onClick="start_autosave(folder, filename, fileformat, quality, interval, filename_fmt_desc)"> <P> <INPUT TYPE="text" NAME="interval_field" SIZE="6" TITLE="Enter intervall in seconds" onChange="read_form3(this.form)" onfocus="disable_hotkeys()" onBlur="enable_hotkeys()"> sec <P> <INPUT TYPE=button VALUE="Reset" TITLE="Reset counter" NAME="button_reset" onClick="reset_filecounter()"> </FORM> <P> </TD> </TR> <TR> <TD COLSPAN=3>  </TD> </TR> </TABLE> <SCRIPT LANGUAGE="JavaScript" FOR="window">  </SCRIPT> </BODY></HTML>