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• File Locked by Services (after service code reading the text file)

  - by rvpals

  I have a windows services written in C# .NET. The service is running on a internal timer, every time the interval hits, it will go and try to read this log file into a String. My issue is every time the log file is read, the service seem to lock the log file. The lock on that log file will continue until I stop the windows service. At the same time the service is checking the log file, the same log file needs to be continuously updated by another program. If the file lock is on, the other program could not update the log file. Here is the code I use to read the text log file. private string ReadtextFile(string filename) { string res = ""; try { System.IO.FileStream fs = new System.IO.FileStream(filename, System.IO.FileMode.Open, System.IO.FileAccess.Read); System.IO.StreamReader sr = new System.IO.StreamReader(fs); res = sr.ReadToEnd(); sr.Close(); fs.Close(); } catch (System.Exception ex) { HandleEx(ex); } return res; } Thank you.

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• 11gR2 Agent ??

  - by Allen Gao

  ??:????oracle 11gR2 ???(Grid Infrastructure,????GI) ??? agent????,?? agent???,???agent??,??????????????:11.2.0.1??????    ?????10gR2 crs ????????????????10gR2 ??,crsd ??????????????????,crsd ?????racg??,??racg?????????,??racgvip ??????vip?????????,???racg??????????,????????????11gR2 GI??, agent ??????????GI??????????,?????agent ???????????,?????    ??????agent??????????1.????????daemon???agent ??????gipc, gpnp? ?ohasd ???orarootagent???2.Agent?????????,???HA(High Available)??.3.Ohasd ??????agent        cssdagent(??agent????“crsctl stat res –t –init” ????ora.cssd )        orarootagent        oraagent        cssdmonitor    Crsd ??????agent        orarootagent        Oraagent        ??????agent.??:??oracle?grid?????????oraagent??????????? oraagent_grid????ora.asm, oraagent_oracle??ora.<database_name>.db???     ?????agent?????????????,agent ????EP(Entry Point),??????????????       Start:????       Stop:????       Check:???????,???????????,?agent???GI,??????????       Clean:????,????????????????,???????failover?????       Abort:?????    ??????EP????,????????????,????????????????       ONLINE:????????online??       OFFLINE:????????offline?????offline??,?????planed offline ?unplaned offline?Planed offline??GI?????????offline??,??????GI?????(srvctl, crsctl)???????,????,GI?????????offline??,????????????GI???????,??planed offline???,??target????????offline??,????,??????target???offline???GI stacks,?????auto_start?????always,??,??????????(??target??,???auto_start?????,???oracle????Oracle Clusterware Administration and Deployment Guide 11g Release 2)???unplaned offline,?????GI???????,????sqlplus???????,??????,GI???????????offline??,???target?????online,??,???????GI???????,???????auto_start?????never?       UNKNOWN:??,?????unknown?????????,agent?????????check?       PARTIAL:??????,?????intermediate??? ??????agent?????????check,??????????       FAILED:???????????????,??????,agent?????clean EP,?????????????failover?restart???    ??,??????????????agent?????????????? Normal 0 7.8 ? 0 2 false false false EN-US ZH-CN X-NONE MicrosoftInternetExplorer4 DefSemiHidden="true" DefQFormat="false" DefPriority="99" LatentStyleCount="267" UnhideWhenUsed="false" QFormat="true" Name="Normal"/ UnhideWhenUsed="false" QFormat="true" Name="heading 1"/ UnhideWhenUsed="false" QFormat="true" Name="Title"/ UnhideWhenUsed="false" QFormat="true" Name="Subtitle"/ UnhideWhenUsed="false" QFormat="true" Name="Strong"/ UnhideWhenUsed="false" QFormat="true" Name="Emphasis"/ UnhideWhenUsed="false" Name="Table Grid"/ UnhideWhenUsed="false" QFormat="true" Name="No Spacing"/ UnhideWhenUsed="false" Name="Light Shading"/ UnhideWhenUsed="false" Name="Light List"/ UnhideWhenUsed="false" Name="Light Grid"/ UnhideWhenUsed="false" Name="Medium Shading 1"/ UnhideWhenUsed="false" Name="Medium Shading 2"/ UnhideWhenUsed="false" Name="Medium List 1"/ UnhideWhenUsed="false" Name="Medium List 2"/ UnhideWhenUsed="false" Name="Medium Grid 1"/ UnhideWhenUsed="false" Name="Medium Grid 2"/ UnhideWhenUsed="false" Name="Medium Grid 3"/ UnhideWhenUsed="false" Name="Dark List"/ UnhideWhenUsed="false" Name="Colorful Shading"/ UnhideWhenUsed="false" Name="Colorful List"/ UnhideWhenUsed="false" Name="Colorful Grid"/ UnhideWhenUsed="false" Name="Light Shading Accent 1"/ UnhideWhenUsed="false" Name="Light List Accent 1"/ UnhideWhenUsed="false" Name="Light Grid Accent 1"/ UnhideWhenUsed="false" Name="Medium Shading 1 Accent 1"/ UnhideWhenUsed="false" Name="Medium Shading 2 Accent 1"/ UnhideWhenUsed="false" Name="Medium List 1 Accent 1"/ UnhideWhenUsed="false" QFormat="true" Name="List Paragraph"/ UnhideWhenUsed="false" QFormat="true" Name="Quote"/ UnhideWhenUsed="false" QFormat="true" Name="Intense Quote"/ UnhideWhenUsed="false" Name="Medium List 2 Accent 1"/ UnhideWhenUsed="false" Name="Medium Grid 1 Accent 1"/ UnhideWhenUsed="false" Name="Medium Grid 2 Accent 1"/ UnhideWhenUsed="false" Name="Medium Grid 3 Accent 1"/ UnhideWhenUsed="false" Name="Dark List Accent 1"/ UnhideWhenUsed="false" Name="Colorful Shading Accent 1"/ UnhideWhenUsed="false" Name="Colorful List Accent 1"/ UnhideWhenUsed="false" Name="Colorful Grid Accent 1"/ UnhideWhenUsed="false" Name="Light Shading Accent 2"/ UnhideWhenUsed="false" Name="Light List Accent 2"/ UnhideWhenUsed="false" Name="Light Grid Accent 2"/ UnhideWhenUsed="false" Name="Medium Shading 1 Accent 2"/ UnhideWhenUsed="false" Name="Medium Shading 2 Accent 2"/ UnhideWhenUsed="false" Name="Medium List 1 Accent 2"/ UnhideWhenUsed="false" Name="Medium List 2 Accent 2"/ UnhideWhenUsed="false" Name="Medium Grid 1 Accent 2"/ UnhideWhenUsed="false" Name="Medium Grid 2 Accent 2"/ UnhideWhenUsed="false" Name="Medium Grid 3 Accent 2"/ UnhideWhenUsed="false" Name="Dark List Accent 2"/ UnhideWhenUsed="false" Name="Colorful Shading Accent 2"/ UnhideWhenUsed="false" Name="Colorful List Accent 2"/ UnhideWhenUsed="false" Name="Colorful Grid Accent 2"/ UnhideWhenUsed="false" Name="Light Shading Accent 3"/ UnhideWhenUsed="false" Name="Light List Accent 3"/ UnhideWhenUsed="false" Name="Light Grid Accent 3"/ UnhideWhenUsed="false" Name="Medium Shading 1 Accent 3"/ UnhideWhenUsed="false" Name="Medium Shading 2 Accent 3"/ UnhideWhenUsed="false" Name="Medium List 1 Accent 3"/ UnhideWhenUsed="false" Name="Medium List 2 Accent 3"/ UnhideWhenUsed="false" Name="Medium Grid 1 Accent 3"/ UnhideWhenUsed="false" Name="Medium Grid 2 Accent 3"/ UnhideWhenUsed="false" Name="Medium Grid 3 Accent 3"/ UnhideWhenUsed="false" Name="Dark List Accent 3"/ UnhideWhenUsed="false" Name="Colorful Shading Accent 3"/ UnhideWhenUsed="false" Name="Colorful List Accent 3"/ UnhideWhenUsed="false" Name="Colorful Grid Accent 3"/ UnhideWhenUsed="false" Name="Light Shading Accent 4"/ UnhideWhenUsed="false" Name="Light List Accent 4"/ UnhideWhenUsed="false" Name="Light Grid Accent 4"/ UnhideWhenUsed="false" Name="Medium Shading 1 Accent 4"/ UnhideWhenUsed="false" Name="Medium Shading 2 Accent 4"/ UnhideWhenUsed="false" Name="Medium List 1 Accent 4"/ UnhideWhenUsed="false" Name="Medium List 2 Accent 4"/ UnhideWhenUsed="false" Name="Medium Grid 1 Accent 4"/ UnhideWhenUsed="false" Name="Medium Grid 2 Accent 4"/ UnhideWhenUsed="false" Name="Medium Grid 3 Accent 4"/ UnhideWhenUsed="false" Name="Dark List Accent 4"/ UnhideWhenUsed="false" Name="Colorful Shading Accent 4"/ UnhideWhenUsed="false" Name="Colorful List Accent 4"/ UnhideWhenUsed="false" Name="Colorful Grid Accent 4"/ UnhideWhenUsed="false" Name="Light Shading Accent 5"/ UnhideWhenUsed="false" Name="Light List Accent 5"/ UnhideWhenUsed="false" Name="Light Grid Accent 5"/ UnhideWhenUsed="false" Name="Medium Shading 1 Accent 5"/ UnhideWhenUsed="false" Name="Medium Shading 2 Accent 5"/ UnhideWhenUsed="false" Name="Medium List 1 Accent 5"/ UnhideWhenUsed="false" Name="Medium List 2 Accent 5"/ UnhideWhenUsed="false" Name="Medium Grid 1 Accent 5"/ UnhideWhenUsed="false" Name="Medium Grid 2 Accent 5"/ UnhideWhenUsed="false" Name="Medium Grid 3 Accent 5"/ UnhideWhenUsed="false" Name="Dark List Accent 5"/ UnhideWhenUsed="false" Name="Colorful Shading Accent 5"/ UnhideWhenUsed="false" Name="Colorful List Accent 5"/ UnhideWhenUsed="false" Name="Colorful Grid Accent 5"/ UnhideWhenUsed="false" Name="Light Shading Accent 6"/ UnhideWhenUsed="false" Name="Light List Accent 6"/ UnhideWhenUsed="false" Name="Light Grid Accent 6"/ UnhideWhenUsed="false" Name="Medium Shading 1 Accent 6"/ UnhideWhenUsed="false" Name="Medium Shading 2 Accent 6"/ UnhideWhenUsed="false" Name="Medium List 1 Accent 6"/ UnhideWhenUsed="false" Name="Medium List 2 Accent 6"/ UnhideWhenUsed="false" Name="Medium Grid 1 Accent 6"/ UnhideWhenUsed="false" Name="Medium Grid 2 Accent 6"/ UnhideWhenUsed="false" Name="Medium Grid 3 Accent 6"/ UnhideWhenUsed="false" Name="Dark List Accent 6"/ UnhideWhenUsed="false" Name="Colorful Shading Accent 6"/ UnhideWhenUsed="false" Name="Colorful List Accent 6"/ UnhideWhenUsed="false" Name="Colorful Grid Accent 6"/ UnhideWhenUsed="false" QFormat="true" Name="Subtle Emphasis"/ UnhideWhenUsed="false" QFormat="true" Name="Intense Emphasis"/ UnhideWhenUsed="false" QFormat="true" Name="Subtle Reference"/ UnhideWhenUsed="false" QFormat="true" Name="Intense Reference"/ UnhideWhenUsed="false" QFormat="true" Name="Book Title"/ /* Style Definitions */ table.MsoNormalTable {mso-style-name:????; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.5pt; mso-bidi-font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:??; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi; mso-font-kerning:1.0pt;}     ??,???agent???trace????????????,agent?trace ??????GRID_HOME/log/<host>/agent?,???????????            GRID_HOME/log/<host>/agent /ohasd/orarootagent_root  <– ohasd???orarootagent??            GRID_HOME/log/<host>/agent/ohasd/oraagent_grid  <– ohasd???oraagent??            GRID_HOME/log/<host>/agent/ohasd/oracssdagent_root  <– ohasd???cssdagent??            GRID_HOME/log/<host>/agent/ohasd/oracssdmonitor_root  <– ohasd???cssdmonitor??            GRID_HOME/log/<host>/agent/crsd/oraagent_grid  <– crsd???oraagent??,owner?grid            GRID_HOME/log/<host>/agent/crsd/oraagent_oracle  <– crsd???oraagent??,owner?oracle            GRID_HOME/log/<host>/agent/crsd/orarootagent_root  <–crsd???orarootagent??    ??,????????agent???????????            ??alert log(Grid_home/log/<hostname>/alert<hostname>.log)            Grid_home/log/<hostname>/ohasd/ohasd.log            Grid_home/log/<hostname>/crsd/crsd.log     ????agent????????,??,?????????????,??????????????agent???????,??Agent????????,????????????Agent??crash,?????,?????core??(Grid_home/log/<hostname>/agent/{ohasd|crsd}/<agent?>_<???>)????????(Grid_home/log/<hostname>/agent/{ohasd|crsd}/<agent?>_<???>/<agent?>_<???>OUT.log)? v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} Normal 0 7.8 ? 0 2 false false false EN-US ZH-CN X-NONE MicrosoftInternetExplorer4 DefSemiHidden="true" DefQFormat="false" DefPriority="99" LatentStyleCount="267" UnhideWhenUsed="false" QFormat="true" Name="Normal"/ UnhideWhenUsed="false" QFormat="true" Name="heading 1"/ UnhideWhenUsed="false" QFormat="true" Name="Title"/ UnhideWhenUsed="false" QFormat="true" Name="Subtitle"/ UnhideWhenUsed="false" QFormat="true" Name="Strong"/ UnhideWhenUsed="false" QFormat="true" Name="Emphasis"/ UnhideWhenUsed="false" Name="Table Grid"/ UnhideWhenUsed="false" QFormat="true" Name="No Spacing"/ UnhideWhenUsed="false" Name="Light Shading"/ UnhideWhenUsed="false" Name="Light List"/ UnhideWhenUsed="false" Name="Light Grid"/ UnhideWhenUsed="false" Name="Medium Shading 1"/ UnhideWhenUsed="false" Name="Medium Shading 2"/ UnhideWhenUsed="false" Name="Medium List 1"/ UnhideWhenUsed="false" Name="Medium List 2"/ UnhideWhenUsed="false" Name="Medium Grid 1"/ UnhideWhenUsed="false" Name="Medium Grid 2"/ UnhideWhenUsed="false" Name="Medium Grid 3"/ UnhideWhenUsed="false" Name="Dark List"/ UnhideWhenUsed="false" Name="Colorful Shading"/ UnhideWhenUsed="false" Name="Colorful List"/ UnhideWhenUsed="false" Name="Colorful Grid"/ UnhideWhenUsed="false" Name="Light Shading Accent 1"/ UnhideWhenUsed="false" Name="Light List Accent 1"/ UnhideWhenUsed="false" Name="Light Grid Accent 1"/ UnhideWhenUsed="false" Name="Medium Shading 1 Accent 1"/ UnhideWhenUsed="false" Name="Medium Shading 2 Accent 1"/ UnhideWhenUsed="false" Name="Medium List 1 Accent 1"/ UnhideWhenUsed="false" QFormat="true" Name="List Paragraph"/ UnhideWhenUsed="false" QFormat="true" Name="Quote"/ UnhideWhenUsed="false" QFormat="true" Name="Intense Quote"/ UnhideWhenUsed="false" Name="Medium List 2 Accent 1"/ UnhideWhenUsed="false" Name="Medium Grid 1 Accent 1"/ UnhideWhenUsed="false" Name="Medium Grid 2 Accent 1"/ UnhideWhenUsed="false" Name="Medium Grid 3 Accent 1"/ UnhideWhenUsed="false" Name="Dark List Accent 1"/ UnhideWhenUsed="false" Name="Colorful Shading Accent 1"/ UnhideWhenUsed="false" Name="Colorful List Accent 1"/ UnhideWhenUsed="false" Name="Colorful Grid Accent 1"/ UnhideWhenUsed="false" Name="Light Shading Accent 2"/ UnhideWhenUsed="false" Name="Light List Accent 2"/ UnhideWhenUsed="false" Name="Light Grid Accent 2"/ UnhideWhenUsed="false" Name="Medium Shading 1 Accent 2"/ UnhideWhenUsed="false" Name="Medium Shading 2 Accent 2"/ UnhideWhenUsed="false" Name="Medium List 1 Accent 2"/ UnhideWhenUsed="false" Name="Medium List 2 Accent 2"/ UnhideWhenUsed="false" Name="Medium Grid 1 Accent 2"/ UnhideWhenUsed="false" Name="Medium Grid 2 Accent 2"/ UnhideWhenUsed="false" Name="Medium Grid 3 Accent 2"/ UnhideWhenUsed="false" Name="Dark List Accent 2"/ UnhideWhenUsed="false" Name="Colorful Shading Accent 2"/ UnhideWhenUsed="false" Name="Colorful List Accent 2"/ UnhideWhenUsed="false" Name="Colorful Grid Accent 2"/ UnhideWhenUsed="false" Name="Light Shading Accent 3"/ UnhideWhenUsed="false" Name="Light List Accent 3"/ UnhideWhenUsed="false" Name="Light Grid Accent 3"/ UnhideWhenUsed="false" Name="Medium Shading 1 Accent 3"/ UnhideWhenUsed="false" Name="Medium Shading 2 Accent 3"/ UnhideWhenUsed="false" Name="Medium List 1 Accent 3"/ UnhideWhenUsed="false" Name="Medium List 2 Accent 3"/ UnhideWhenUsed="false" Name="Medium Grid 1 Accent 3"/ UnhideWhenUsed="false" Name="Medium Grid 2 Accent 3"/ UnhideWhenUsed="false" Name="Medium Grid 3 Accent 3"/ UnhideWhenUsed="false" Name="Dark List Accent 3"/ UnhideWhenUsed="false" Name="Colorful Shading Accent 3"/ UnhideWhenUsed="false" Name="Colorful List Accent 3"/ UnhideWhenUsed="false" Name="Colorful Grid Accent 3"/ UnhideWhenUsed="false" Name="Light Shading Accent 4"/ UnhideWhenUsed="false" Name="Light List Accent 4"/ UnhideWhenUsed="false" Name="Light Grid Accent 4"/ UnhideWhenUsed="false" Name="Medium Shading 1 Accent 4"/ UnhideWhenUsed="false" Name="Medium Shading 2 Accent 4"/ UnhideWhenUsed="false" Name="Medium List 1 Accent 4"/ UnhideWhenUsed="false" Name="Medium List 2 Accent 4"/ UnhideWhenUsed="false" Name="Medium Grid 1 Accent 4"/ UnhideWhenUsed="false" Name="Medium Grid 2 Accent 4"/ UnhideWhenUsed="false" Name="Medium Grid 3 Accent 4"/ UnhideWhenUsed="false" Name="Dark List Accent 4"/ UnhideWhenUsed="false" Name="Colorful Shading Accent 4"/ UnhideWhenUsed="false" Name="Colorful List Accent 4"/ UnhideWhenUsed="false" Name="Colorful Grid Accent 4"/ UnhideWhenUsed="false" Name="Light Shading Accent 5"/ UnhideWhenUsed="false" Name="Light List Accent 5"/ UnhideWhenUsed="false" Name="Light Grid Accent 5"/ UnhideWhenUsed="false" Name="Medium Shading 1 Accent 5"/ UnhideWhenUsed="false" Name="Medium Shading 2 Accent 5"/ UnhideWhenUsed="false" Name="Medium List 1 Accent 5"/ UnhideWhenUsed="false" Name="Medium List 2 Accent 5"/ UnhideWhenUsed="false" Name="Medium Grid 1 Accent 5"/ UnhideWhenUsed="false" Name="Medium Grid 2 Accent 5"/ UnhideWhenUsed="false" Name="Medium Grid 3 Accent 5"/ UnhideWhenUsed="false" Name="Dark List Accent 5"/ UnhideWhenUsed="false" Name="Colorful Shading Accent 5"/ UnhideWhenUsed="false" Name="Colorful List Accent 5"/ UnhideWhenUsed="false" Name="Colorful Grid Accent 5"/ UnhideWhenUsed="false" Name="Light Shading Accent 6"/ UnhideWhenUsed="false" Name="Light List Accent 6"/ UnhideWhenUsed="false" Name="Light Grid Accent 6"/ UnhideWhenUsed="false" Name="Medium Shading 1 Accent 6"/ UnhideWhenUsed="false" Name="Medium Shading 2 Accent 6"/ UnhideWhenUsed="false" Name="Medium List 1 Accent 6"/ UnhideWhenUsed="false" Name="Medium List 2 Accent 6"/ UnhideWhenUsed="false" Name="Medium Grid 1 Accent 6"/ UnhideWhenUsed="false" Name="Medium Grid 2 Accent 6"/ UnhideWhenUsed="false" Name="Medium Grid 3 Accent 6"/ UnhideWhenUsed="false" Name="Dark List Accent 6"/ UnhideWhenUsed="false" Name="Colorful Shading Accent 6"/ UnhideWhenUsed="false" Name="Colorful List Accent 6"/ UnhideWhenUsed="false" Name="Colorful Grid Accent 6"/ UnhideWhenUsed="false" QFormat="true" Name="Subtle Emphasis"/ UnhideWhenUsed="false" QFormat="true" Name="Intense Emphasis"/ UnhideWhenUsed="false" QFormat="true" Name="Subtle Reference"/ UnhideWhenUsed="false" QFormat="true" Name="Intense Reference"/ UnhideWhenUsed="false" QFormat="true" Name="Book Title"/ /* Style Definitions */ table.MsoNormalTable {mso-style-name:????; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.5pt; mso-bidi-font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:??; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi; mso-font-kerning:1.0pt;}

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• Batch file to check if a file exists and raise an error if it doesn't

  - by cfdev9

  This batch file releases a build from TEST to LIVE. I want to add a check constraint in this file that ensures there is an accomanying release document in a specific folder. "C:\Program Files\Windows Resource Kits\Tools\robocopy.exe" "\\testserver\testapp$" "\\liveserver\liveapp$" *.* /E /XA:H /PURGE /XO /XD ".svn" /NDL /NC /NS /NP del "\\liveserver\liveapp$\web.config" ren "\\liveserver\liveapp$\web.live.config" web.config So I have a couple of questions about how to achieve this... There is a version.txt file in the \testserver\testapp$ folder and the only contents of this file is the build number (eg 45 - for build 45) How do I read the contents of the version.txt file into a variable in the batch file? How do I check if a file \fileserver\myapp\releasedocs\ {build}.doc exists using the variable from part 1 in place of {build}?

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• C Remove the first line from a text file without rewriting file

  - by Tom Van den Bon

  Hi, I've got a service which runs all the time and also keeps a log file. It basically adds new lines to the log file every few seconds. I'm written a small file which reads these lines and then parses them to various actions. The question I have is how can I delete the lines which I have already parsed from the log file without disrupting the writing of the log file by the service? Usually when I need to delete a line in a file then I open the original one and a temporary one and then I just write all the lines to the temp file except the original which I want to delete. Obviously this method will not word here. So how do I go about deleting them ?

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• Udev webcam rule read, but not respected?

  - by user89305

  I have two usb-webcams on them machine, but at bot they some switch /dev/video number. The solution to this problem seems to be new udev rule. I have added this rule in/etc/udev/rules.d/jj-video.rules: Fix webcam 1 KERNEL=="video1", SUBSYSTEM=="video4linux", SUBSYSTEMS=="usb", ATTRS{idVendor}=="1d6b", ATTRS{idProduct}=="0001", SYMLINK+="webcam1" Fix webcam 2 KERNEL=="video2", SUBSYSTEM=="video4linux", ATTR{name}=="Logitech QuickCam Pro 3000", KERNELS=="0000:00:1d.0", SUBSYSTEMS=="pci", DRIVERS=="uhci_hcd", ATTRS{vendor}=="0x8086", ATTRS##{device}=="0x2658", SYMLINK+="webcam2" but the symlinks are not created. I have tried many different combinations in this file. The present ones are just my lates attempts. I found the parameters in: jjk@eee-old:~$ udevadm info -a -p $(udevadm info -q path -p /class/video4linux/video1) Udevadm info starts with the device specified by the devpath and then walks up the chain of parent devices. It prints for every device found, all possible attributes in the udev rules key format. A rule to match, can be composed by the attributes of the device and the attributes from one single parent device. looking at device '/devices/pci0000:00/0000:00:1d.0/usb2/2-2/2-2:1.0/video4linux/video1': KERNEL=="video1" SUBSYSTEM=="video4linux" DRIVER=="" ATTR{name}=="Logitech QuickCam Pro 3000" ATTR{index}=="0" ATTR{button}=="0" looking at parent device '/devices/pci0000:00/0000:00:1d.0/usb2/2-2/2-2:1.0': KERNELS=="2-2:1.0" SUBSYSTEMS=="usb" DRIVERS=="Philips webcam" ATTRS{bInterfaceNumber}=="00" ATTRS{bAlternateSetting}==" 9" ATTRS{bNumEndpoints}=="02" ATTRS{bInterfaceClass}=="0a" ATTRS{bInterfaceSubClass}=="ff" ATTRS{bInterfaceProtocol}=="00" ATTRS{supports_autosuspend}=="0" looking at parent device '/devices/pci0000:00/0000:00:1d.0/usb2/2-2': KERNELS=="2-2" SUBSYSTEMS=="usb" DRIVERS=="usb" ATTRS{configuration}=="" ATTRS{bNumInterfaces}==" 3" ATTRS{bConfigurationValue}=="1" ATTRS{bmAttributes}=="a0" ATTRS{bMaxPower}=="500mA" ATTRS{urbnum}=="371076" ATTRS{idVendor}=="046d" ATTRS{idProduct}=="08b0" ATTRS{bcdDevice}=="0002" ATTRS{bDeviceClass}=="00" ATTRS{bDeviceSubClass}=="00" ATTRS{bDeviceProtocol}=="00" ATTRS{bNumConfigurations}=="1" ATTRS{bMaxPacketSize0}=="8" ATTRS{speed}=="12" ATTRS{busnum}=="2" ATTRS{devnum}=="2" ATTRS{devpath}=="2" ATTRS{version}==" 1.10" ATTRS{maxchild}=="0" ATTRS{quirks}=="0x0" ATTRS{avoid_reset_quirk}=="0" ATTRS{authorized}=="1" ATTRS{serial}=="01402100A5000000" looking at parent device '/devices/pci0000:00/0000:00:1d.0/usb2': KERNELS=="usb2" SUBSYSTEMS=="usb" DRIVERS=="usb" ATTRS{configuration}=="" ATTRS{bNumInterfaces}==" 1" ATTRS{bConfigurationValue}=="1" ATTRS{bmAttributes}=="e0" ATTRS{bMaxPower}==" 0mA" ATTRS{urbnum}=="34" ATTRS{idVendor}=="1d6b" ATTRS{idProduct}=="0001" ATTRS{bcdDevice}=="0302" ATTRS{bDeviceClass}=="09" ATTRS{bDeviceSubClass}=="00" ATTRS{bDeviceProtocol}=="00" ATTRS{bNumConfigurations}=="1" ATTRS{bMaxPacketSize0}=="64" ATTRS{speed}=="12" ATTRS{busnum}=="2" ATTRS{devnum}=="1" ATTRS{devpath}=="0" ATTRS{version}==" 1.10" ATTRS{maxchild}=="2" ATTRS{quirks}=="0x0" ATTRS{avoid_reset_quirk}=="0" ATTRS{authorized}=="1" ATTRS{manufacturer}=="Linux 3.2.0-29-generic uhci_hcd" ATTRS{product}=="UHCI Host Controller" ATTRS{serial}=="0000:00:1d.0" ATTRS{authorized_default}=="1" looking at parent device '/devices/pci0000:00/0000:00:1d.0': KERNELS=="0000:00:1d.0" SUBSYSTEMS=="pci" DRIVERS=="uhci_hcd" ATTRS{vendor}=="0x8086" ATTRS{device}=="0x2658" ATTRS{subsystem_vendor}=="0x1043" ATTRS{subsystem_device}=="0x82d8" ATTRS{class}=="0x0c0300" ATTRS{irq}=="23" ATTRS{local_cpus}=="ff" ATTRS{local_cpulist}=="0-7" ATTRS{dma_mask_bits}=="32" ATTRS{consistent_dma_mask_bits}=="32" ATTRS{broken_parity_status}=="0" ATTRS{msi_bus}=="" looking at parent device '/devices/pci0000:00': KERNELS=="pci0000:00" SUBSYSTEMS=="" DRIVERS=="" jjk@eee-old:~$ And tested the setup: sudo udevadm --debug test /sys/class/video4linux/video1 main: runtime dir '/run/udev' run_command: calling: test adm_test: version 175 This program is for debugging only, it does not run any program, specified by a RUN key. It may show incorrect results, because some values may be different, or not available at a simulation run. parse_file: reading '/lib/udev/rules.d/40-crda.rules' as rules file parse_file: reading '/lib/udev/rules.d/40-fuse.rules' as rules file parse_file: reading '/lib/udev/rules.d/40-gnupg.rules' as rules file parse_file: reading '/lib/udev/rules.d/40-hplip.rules' as rules file parse_file: reading '/lib/udev/rules.d/40-ia64.rules' as rules file parse_file: reading '/lib/udev/rules.d/40-inputattach.rules' as rules file parse_file: reading '/lib/udev/rules.d/40-libgphoto2-2.rules' as rules file parse_file: reading '/lib/udev/rules.d/40-libsane.rules' as rules file parse_file: reading '/lib/udev/rules.d/40-ppc.rules' as rules file parse_file: reading '/lib/udev/rules.d/40-usb_modeswitch.rules' as rules file parse_file: reading '/lib/udev/rules.d/40-xserver-xorg-video-intel.rules' as rules file parse_file: reading '/lib/udev/rules.d/42-qemu-usb.rules' as rules file parse_file: reading '/lib/udev/rules.d/50-firmware.rules' as rules file parse_file: reading '/lib/udev/rules.d/50-udev-default.rules' as rules file parse_file: reading '/lib/udev/rules.d/55-dm.rules' as rules file parse_file: reading '/lib/udev/rules.d/56-hpmud_support.rules' as rules file parse_file: reading '/lib/udev/rules.d/60-cdrom_id.rules' as rules file parse_file: reading '/lib/udev/rules.d/60-pcmcia.rules' as rules file parse_file: reading '/lib/udev/rules.d/60-persistent-alsa.rules' as rules file parse_file: reading '/lib/udev/rules.d/60-persistent-input.rules' as rules file parse_file: reading '/lib/udev/rules.d/60-persistent-serial.rules' as rules file parse_file: reading '/lib/udev/rules.d/60-persistent-storage-dm.rules' as rules file parse_file: reading '/lib/udev/rules.d/60-persistent-storage-tape.rules' as rules file parse_file: reading '/lib/udev/rules.d/60-persistent-storage.rules' as rules file parse_file: reading '/lib/udev/rules.d/60-persistent-v4l.rules' as rules file parse_file: reading '/lib/udev/rules.d/61-accelerometer.rules' as rules file parse_file: reading '/lib/udev/rules.d/64-xorg-xkb.rules' as rules file parse_file: reading '/lib/udev/rules.d/66-xorg-synaptics-quirks.rules' as rules file parse_file: reading '/lib/udev/rules.d/69-cd-sensors.rules' as rules file add_rule: IMPORT found builtin 'usb_id', replacing /lib/udev/rules.d/69-cd-sensors.rules:76 parse_file: reading '/lib/udev/rules.d/69-libmtp.rules' as rules file parse_file: reading '/lib/udev/rules.d/69-xorg-vmmouse.rules' as rules file parse_file: reading '/lib/udev/rules.d/69-xserver-xorg-input-wacom.rules' as rules file parse_file: reading '/etc/udev/rules.d/70-persistent-cd.rules' as rules file parse_file: reading '/etc/udev/rules.d/70-persistent-net.rules' as rules file parse_file: reading '/lib/udev/rules.d/70-printers.rules' as rules file parse_file: reading '/lib/udev/rules.d/70-udev-acl.rules' as rules file parse_file: reading '/lib/udev/rules.d/75-cd-aliases-generator.rules' as rules file parse_file: reading '/lib/udev/rules.d/75-net-description.rules' as rules file parse_file: reading '/lib/udev/rules.d/75-persistent-net-generator.rules' as rules file parse_file: reading '/lib/udev/rules.d/75-probe_mtd.rules' as rules file parse_file: reading '/lib/udev/rules.d/75-tty-description.rules' as rules file parse_file: reading '/lib/udev/rules.d/77-mm-ericsson-mbm.rules' as rules file parse_file: reading '/lib/udev/rules.d/77-mm-longcheer-port-types.rules' as rules file parse_file: reading '/lib/udev/rules.d/77-mm-nokia-port-types.rules' as rules file parse_file: reading '/lib/udev/rules.d/77-mm-pcmcia-device-blacklist.rules' as rules file parse_file: reading '/lib/udev/rules.d/77-mm-platform-serial-whitelist.rules' as rules file parse_file: reading '/lib/udev/rules.d/77-mm-qdl-device-blacklist.rules' as rules file parse_file: reading '/lib/udev/rules.d/77-mm-simtech-port-types.rules' as rules file parse_file: reading '/lib/udev/rules.d/77-mm-usb-device-blacklist.rules' as rules file parse_file: reading '/lib/udev/rules.d/77-mm-x22x-port-types.rules' as rules file parse_file: reading '/lib/udev/rules.d/77-mm-zte-port-types.rules' as rules file parse_file: reading '/lib/udev/rules.d/77-nm-olpc-mesh.rules' as rules file parse_file: reading '/lib/udev/rules.d/78-graphics-card.rules' as rules file parse_file: reading '/lib/udev/rules.d/78-sound-card.rules' as rules file parse_file: reading '/lib/udev/rules.d/80-drivers.rules' as rules file parse_file: reading '/lib/udev/rules.d/80-mm-candidate.rules' as rules file parse_file: reading '/lib/udev/rules.d/80-udisks.rules' as rules file parse_file: reading '/lib/udev/rules.d/85-brltty.rules' as rules file parse_file: reading '/lib/udev/rules.d/85-hdparm.rules' as rules file parse_file: reading '/lib/udev/rules.d/85-hplj10xx.rules' as rules file parse_file: reading '/lib/udev/rules.d/85-keyboard-configuration.rules' as rules file parse_file: reading '/lib/udev/rules.d/85-regulatory.rules' as rules file parse_file: reading '/lib/udev/rules.d/85-usbmuxd.rules' as rules file parse_file: reading '/lib/udev/rules.d/90-alsa-restore.rules' as rules file parse_file: reading '/lib/udev/rules.d/90-alsa-ucm.rules' as rules file parse_file: reading '/lib/udev/rules.d/90-libgpod.rules' as rules file parse_file: reading '/lib/udev/rules.d/90-pulseaudio.rules' as rules file parse_file: reading '/lib/udev/rules.d/95-cd-devices.rules' as rules file parse_file: reading '/lib/udev/rules.d/95-keyboard-force-release.rules' as rules file parse_file: reading '/lib/udev/rules.d/95-keymap.rules' as rules file parse_file: reading '/lib/udev/rules.d/95-udev-late.rules' as rules file parse_file: reading '/lib/udev/rules.d/95-upower-battery-recall-dell.rules' as rules file parse_file: reading '/lib/udev/rules.d/95-upower-battery-recall-fujitsu.rules' as rules file parse_file: reading '/lib/udev/rules.d/95-upower-battery-recall-gateway.rules' as rules file parse_file: reading '/lib/udev/rules.d/95-upower-battery-recall-ibm.rules' as rules file parse_file: reading '/lib/udev/rules.d/95-upower-battery-recall-lenovo.rules' as rules file parse_file: reading '/lib/udev/rules.d/95-upower-battery-recall-toshiba.rules' as rules file parse_file: reading '/lib/udev/rules.d/95-upower-csr.rules' as rules file parse_file: reading '/lib/udev/rules.d/95-upower-hid.rules' as rules file parse_file: reading '/lib/udev/rules.d/95-upower-wup.rules' as rules file parse_file: reading '/lib/udev/rules.d/97-bluetooth-hid2hci.rules' as rules file parse_file: reading '/etc/udev/rules.d/jj-video.rules' as rules file udev_rules_new: rules use 259284 bytes tokens (21607 * 12 bytes), 37913 bytes buffer udev_rules_new: temporary index used 67520 bytes (3376 * 20 bytes) udev_device_new_from_syspath: device 0x215103e0 has devpath '/devices/pci0000:00/0000:00:1d.0/usb2/2-2/2-2:1.0/video4linux/video1' udev_device_new_from_syspath: device 0x21510758 has devpath '/devices/pci0000:00/0000:00:1d.0/usb2/2-2/2-2:1.0/video4linux/video1' udev_device_read_db: device 0x21510758 filled with db file data udev_device_new_from_syspath: device 0x21510e10 has devpath '/devices/pci0000:00/0000:00:1d.0/usb2/2-2/2-2:1.0' udev_device_new_from_syspath: device 0x21511b10 has devpath '/devices/pci0000:00/0000:00:1d.0/usb2/2-2' udev_device_new_from_syspath: device 0x215132f8 has devpath '/devices/pci0000:00/0000:00:1d.0/usb2' udev_device_new_from_syspath: device 0x21513650 has devpath '/devices/pci0000:00/0000:00:1d.0' udev_device_new_from_syspath: device 0x21513980 has devpath '/devices/pci0000:00' udev_rules_apply_to_event: GROUP 44 /lib/udev/rules.d/50-udev-default.rules:29 udev_rules_apply_to_event: IMPORT 'v4l_id /dev/video1' /lib/udev/rules.d/60-persistent-v4l.rules:7 udev_event_spawn: starting 'v4l_id /dev/video1' spawn_read: 'v4l_id /dev/video1'(out) 'ID_V4L_VERSION=2' spawn_read: 'v4l_id /dev/video1'(out) 'ID_V4L_PRODUCT=Logitech QuickCam Pro 3000' spawn_read: 'v4l_id /dev/video1'(out) 'ID_V4L_CAPABILITIES=:capture:' spawn_wait: 'v4l_id /dev/video1' [2609] exit with return code 0 udev_rules_apply_to_event: IMPORT builtin 'usb_id' /lib/udev/rules.d/60-persistent-v4l.rules:9 builtin_usb_id: /sys/devices/pci0000:00/0000:00:1d.0/usb2/2-2/2-2:1.0: if_class 10 protocol 0 udev_builtin_add_property: ID_VENDOR=046d udev_builtin_add_property: ID_VENDOR_ENC=046d udev_builtin_add_property: ID_VENDOR_ID=046d udev_builtin_add_property: ID_MODEL=08b0 udev_builtin_add_property: ID_MODEL_ENC=08b0 udev_builtin_add_property: ID_MODEL_ID=08b0 udev_builtin_add_property: ID_REVISION=0002 udev_builtin_add_property: ID_SERIAL=046d_08b0_01402100A5000000 udev_builtin_add_property: ID_SERIAL_SHORT=01402100A5000000 udev_builtin_add_property: ID_TYPE=generic udev_builtin_add_property: ID_BUS=usb udev_builtin_add_property: ID_USB_INTERFACES=:0aff00:010100:010200: udev_builtin_add_property: ID_USB_INTERFACE_NUM=00 udev_builtin_add_property: ID_USB_DRIVER=Philips webcam udev_rules_apply_to_event: LINK 'v4l/by-id/usb-046d_08b0_01402100A5000000-video-index0' /lib/udev/rules.d/60-persistent-v4l.rules:10 udev_rules_apply_to_event: IMPORT builtin 'path_id' /lib/udev/rules.d/60-persistent-v4l.rules:16 udev_builtin_add_property: ID_PATH=pci-0000:00:1d.0-usb-0:2:1.0 udev_builtin_add_property: ID_PATH_TAG=pci-0000_00_1d_0-usb-0_2_1_0 udev_rules_apply_to_event: LINK 'v4l/by-path/pci-0000:00:1d.0-usb-0:2:1.0-video-index0' /lib/udev/rules.d/60-persistent-v4l.rules:17 udev_rules_apply_to_event: RUN 'udev-acl --action=$env{ACTION} --device=$env{DEVNAME}' /lib/udev/rules.d/70-udev-acl.rules:74 udev_rules_apply_to_event: LINK 'webcam1' /etc/udev/rules.d/jj-video.rules:2 udev_event_execute_rules: no node name set, will use kernel supplied name 'video1' udev_node_add: creating device node '/dev/video1', devnum=81:1, mode=0660, uid=0, gid=44 udev_node_mknod: preserve file '/dev/video1', because it has correct dev_t udev_node_mknod: preserve permissions /dev/video1, 020660, uid=0, gid=44 node_symlink: preserve already existing symlink '/dev/char/81:1' to '../video1' link_find_prioritized: found 'c81:2' claiming '/run/udev/links/v4l\x2fby-id\x2fusb-046d_08b0_01402100A5000000-video-index0' udev_device_new_from_syspath: device 0x21516748 has devpath '/devices/pci0000:00/0000:00:1d.1/usb3/3-2/3-2:1.0/video4linux/video2' udev_device_read_db: device 0x21516748 filled with db file data link_find_prioritized: found 'c81:1' claiming '/run/udev/links/v4l\x2fby-id\x2fusb-046d_08b0_01402100A5000000-video-index0' link_update: creating link '/dev/v4l/by-id/usb-046d_08b0_01402100A5000000-video-index0' to '/dev/video1' node_symlink: atomically replace '/dev/v4l/by-id/usb-046d_08b0_01402100A5000000-video-index0' link_find_prioritized: found 'c81:1' claiming '/run/udev/links/v4l\x2fby-path\x2fpci-0000:00:1d.0-usb-0:2:1.0-video-index0' link_update: creating link '/dev/v4l/by-path/pci-0000:00:1d.0-usb-0:2:1.0-video-index0' to '/dev/video1' node_symlink: preserve already existing symlink '/dev/v4l/by-path/pci-0000:00:1d.0-usb-0:2:1.0-video-index0' to '../../video1' link_find_prioritized: found 'c81:1' claiming '/run/udev/links/webcam1' link_update: creating link '/dev/webcam1' to '/dev/video1' node_symlink: preserve already existing symlink '/dev/webcam1' to 'video1' udev_device_update_db: created db file '/run/udev/data/c81:1' for '/devices/pci0000:00/0000:00:1d.0/usb2/2-2/2-2:1.0/video4linux/video1' ACTION=add COLORD_DEVICE=1 COLORD_KIND=camera DEVLINKS=/dev/v4l/by-id/usb-046d_08b0_01402100A5000000-video-index0 /dev/v4l/by-path/pci-0000:00:1d.0-usb-0:2:1.0-video-index0 /dev/webcam1 DEVNAME=/dev/video1 DEVPATH=/devices/pci0000:00/0000:00:1d.0/usb2/2-2/2-2:1.0/video4linux/video1 ID_BUS=usb ID_MODEL=08b0 ID_MODEL_ENC=08b0 ID_MODEL_ID=08b0 ID_PATH=pci-0000:00:1d.0-usb-0:2:1.0 ID_PATH_TAG=pci-0000_00_1d_0-usb-0_2_1_0 ID_REVISION=0002 ID_SERIAL=046d_08b0_01402100A5000000 ID_SERIAL_SHORT=01402100A5000000 ID_TYPE=generic ID_USB_DRIVER=Philips webcam ID_USB_INTERFACES=:0aff00:010100:010200: ID_USB_INTERFACE_NUM=00 ID_V4L_CAPABILITIES=:capture: ID_V4L_PRODUCT=Logitech QuickCam Pro 3000 ID_V4L_VERSION=2 ID_VENDOR=046d ID_VENDOR_ENC=046d ID_VENDOR_ID=046d MAJOR=81 MINOR=1 SUBSYSTEM=video4linux TAGS=:udev-acl: UDEV_LOG=6 USEC_INITIALIZED=18213768 run: 'udev-acl --action=add --device=/dev/video1' jjk@eee-old:~$ (and correspondingly for video2) It looks to me like my rules are read, but not respected. What am I doing wrong?

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• What can Go chan do that a list cannot?

  - by alpav

  I want to know in which situation Go chan makes code much simpler than using list or queue or array that is usually available in all languages. As it was stated by Rob Pike in one of his speeches about Go lexer, Go channels help to organize data flow between structures that are not homomorphic. I am interested in a simple Go code sample with chan that becomes MUCH more complicated in another language (for example C#) where chan is not available. I am not interested in samples that use chan just to increase performance by avoiding waiting of data between generating list and consuming the list (which can be solved by chunking) or as a way to organize thread safe queue or thread-safe communication (which can be easily solved by locking primitives). I am interested in a sample that makes code simpler structurally disregarding size of data. If such sample does not exist then sample where size of data matters. I guess desired sample would contain bi-directional communication between generator and consumer. Also if someone could add tag [channel] to the list of available tags, that would be great.

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• Is this the right strategy to convert an in-level order binary tree to a doubly linked list?

  - by Ankit Soni

  So I recently came across this question - Make a function that converts a in-level-order binary tree into a doubly linked list. Apparently, it's a common interview question. This is the strategy I had - Simply do a pre-order traversal of the tree, and instead of returning a node, return a list of nodes, in the order in which you traverse them. i.e return a list, and append the current node to the list at each point. For the base case, return the node itself when you are at a leaf. so you would say left = recursive_function(node.left) right = recursive_function(node.right) return(left.append(node.data)).append(right);` Is this the right approach?

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• Why appending to a list in Scala should have O(n) time complexity?

  - by Jubbat

  I am learning Scala at the moment and I just read that the execution time of the append operation for a list (:+) grows linearly with the size of the list. Appending to a list seems like a pretty common operation. Why should the idiomatic way to do this be prepending the components and then reversing the list? It can't also be a design failure as implementation could be changed at any point. From my point of view, both prepending and appending should be O(1). Is there any legitimate reason for this?

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• "t-sql" tool for csv files?

  - by adolf garlic

  Is there a tool that allows to query files based on the following criteria, and change them? creation date filenames (e.g. filetypeA_YYYYMMDD_data2.blah) file content For the example, the workflow could be the following one: Get all files created between date x and date y, where the filename contains z and the file itself contains value x under column zzz. Update it to be a different value/another column.

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• Making a file with terminal commands?

  - by iSeth

  In Windows I can write a file containing commands for cmd (usually .cmd or .bat files). When I click on those files it will open cmd.exe and run them commands the file contains. How would I do this in Ubuntu? I'm sure this is a duplicate, but I can't find my answer. Its similar to these questions, but they don't answer the question: Store frequently used terminal commands in a file CMD.exe Emulator in Ubuntu to run .cmd/.bat file

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• Serializing a list of Key/Value pairs to XML

  - by Slauma

  I have a list of key/value pairs I'd like to store in and retrieve from a XML file. So this task is similar as described here. I am trying to follow the advice in the marked answer (using a KeyValuePair and a XmlSerializer) but I don't get it working. What I have so far is a "Settings" class ... public class Settings { public int simpleValue; public List<KeyValuePair<string, int>> list; } ... an instance of this class ... Settings aSettings = new Settings(); aSettings.simpleValue = 2; aSettings.list = new List<KeyValuePair<string, int>>(); aSettings.list.Add(new KeyValuePair<string, int>("m1", 1)); aSettings.list.Add(new KeyValuePair<string, int>("m2", 2)); ... and the following code to write that instance to a XML file: XmlSerializer serializer = new XmlSerializer(typeof(Settings)); TextWriter writer = new StreamWriter("c:\\testfile.xml"); serializer.Serialize(writer, aSettings); writer.Close(); The resulting file is: <?xml version="1.0" encoding="utf-8"?> <Settings xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <simpleValue>2</simpleValue> <list> <KeyValuePairOfStringInt32 /> <KeyValuePairOfStringInt32 /> </list> </Settings> So neither key nor value of the pairs in my list are stored though the number of elements is correct. Obviously I am doing something basically wrong. My questions are: How can I store the key/value pairs of the list in the file? How can I change the default generated name "KeyValuePairOfStringInt32" of the elements in the list to some other name like "listElement" I'd like to have?

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• Execute batch file after another batch file completes

  - by iulianchira

  I have a batch file coordinating the activity of two other batch file. How can I make it execute the second batch file only after the first bat file finishes execution. I do not care if the first batch file executes successfully or not.

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• PHP File upload fails with blank screen when size exceeds 742 KB.

  - by user284839

  Hi friends, This is one of the most bizarre errors I've come across. So I've written a little file upload web app for my friend and it works fine for any file less than or equal to 742kB in size. Needless to say, I arrived at this precise number based on relentless testing. Weird part is that if the file size is just a few KB more, for example 743 or 750, I get an error saying "MySQL has gone away". But if it is 1MB or more, then I just get a blank screen. And it happens in less than 2 seconds after I hit the upload button. So it doesn't look like a time-out to me. I checked out the PHP.ini file for post size and upload size, they are all set to 5 MB or more. And the timeout is set to 60 seconds. The uploaded file sits in MySQL database in a field of datatype mediumblob. I tried changing that to longblob. But that didn't help either. Any help? Thanks for reading, Girish

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• Copy & rename file using .bat file language?

  - by flyout

  I want to make a .bat to copy & rename a file multiple times. I want to have a list of names, and an original file, then I want to copy that file and rename it for each name on the list. How I can do this using a .bat file? Also is it possible to run winrar fromthe .bat to .rar or .zip every file after copying/renaming?

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• What file format contents starts with "URES"?

  - by Jordan

  I have a number of files that contain data in a format I am not familiar with. All of the data files begin with the same byte sequence, presumably a file header, and the sequence is "URES". I'm assuming that these files are some kind of resource file, perhaps a collection of data or other files all embedded into one file; that's just a guess however. Does anyone know what format this is/might be? If so, how would I interrogate the file? Are there applications that let me open these kind of files? Do you know of any libraries or APIs that I can use to gain programmatic access the data?

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• Writing to a file in Python inserts null bytes

  - by Javier Badia

  I'm writing a todo list program. It keeps a file with a thing to do per line, and lets the user add or delete items. The problem is that for some reason, I end up with a lot of zero bytes at the start of the file, even though the item is correctly deleted. I'll show you a couple of screenshots to make sure I'm making myself clear. This is the file in Notepad++ before running the program: This is the file after deleting item 3 (counting from 1): This is the relevant code. The actual program is bigger, but running just this part triggers the error. import os TODO_FILE = r"E:\javi\code\Python\todo-list\src\todo.txt" def del_elems(f, delete): """Takes an open file and either a number or a list of numbers, and deletes the lines corresponding to those numbers (counting from 1).""" if isinstance(delete, int): delete = [delete] lines = f.readlines() f.truncate(0) counter = 1 for line in lines: if counter not in delete: f.write(line) counter += 1 f = open(TODO_FILE, "r+") del_elems(f, 3) f.close() Could you please point out where's the mistake?

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• Bind postback data from a strong type view of type List<T>

  - by Robert Koritnik

  I have a strong type view of type List<List<MyViewModelClass>> The outer list will always have two lists of List<MyViewModelClass>. For each of the two outer lists I want to display a group of checkboxes. Each set can have an arbitrary number of choices. My view model class looks similar to this: public class MyViewModelClass { public Area Area { get; set; } public bool IsGeneric { get; set; } public string Code { get; set; } public bool IsChecked { get; set; } } So the final view will look something like: Please select those that apply: First set of choices: x Option 1 x Option 2 x Option 3 etc. Second set of choices: x Second Option 1 x Second Option 2 x Second Option 3 x Second Option 4 etc. Checkboxes should display MyViewModelClass.Area.Name, and their value should be related to MyViewModelClass.Area.Id. Checked state is of course related to MyViewModel.IsChecked. Question I wonder how should I use Html.CheckBox() or Html.CheckBoxFor() helper to display my checkboxes? I have to get these values back to the server on a postback of course. I would like to have my controller action like one of these: public ActionResult ConsumeSelections(List<List<MyViewModelClass>> data) { // process data } public ActionResult ConsumeSelections(List<MyViewModelClass> first, List<MyViewModelClass> second) { // process data } If it makes things simpler, I could make a separate view model type like: public class Options { public List First { get; set; } public List Second { get; set; } } As well as changing my first version of controller action to: public ActionResult ConsumeSelections(Options data) { // process data }

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• Windows batch file: choosing a file from a directory based on directory name

  - by Stefan Kendall

  I don't do windows batch programming, nor do I need to go that far down the rabbit hole. I have directory structures as such: dir1000000/file.txt dir2000000_1/file.txt dir2000000_2/file.txt I need to select the file.txt from the path with the lexicographically greatest value, i.e. dir2000000_2/file.txt. How do I go about doing this?

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• Parallel For Loop - Problems when adding to a List - Possible .Net Bugs

  - by Kevin Crowell

  I am having some issues involving Parallel for loops and adding to a List. The problem is, the same code may generate different output at different times. I have set up some test code below. In this code, I create a List of 10,000 int values. 1/10th of the values will be 0, 1/10th of the values will be 1, all the way up to 1/10th of the values being 9. After setting up this List, I setup a Parallel for loop that iterates through the list. If the current number is 0, I add a value to a new List. After the Parallel for loop completes, I output the size of the list. The size should always be 1,000. Most of the time, the correct answer is given. However, I have seen 3 possible incorrect outcomes occur: The size of the list is less than 1,000 An IndexOutOfRangeException occurs @ doubleList.Add(0.0); An ArgumentException occurs @ doubleList.Add(0.0); The message for the ArgumentException given was: Destination array was not long enough. Check destIndex and length, and the array's lower bounds. What could be causing the errors? Is this a .Net bug? Is there something I can do to prevent this from happening? Please try the code for yourself. If you do not get an error, try it a few times. Please also note that you probably will not see any errors using a single-core machine. using System; using System.Collections.Generic; using System.Threading.Tasks; namespace ParallelTest { class Program { static void Main(string[] args) { List<int> intList = new List<int>(); List<double> doubleList = new List<double>(); for (int i = 0; i < 250; i++) { intList.Clear(); doubleList.Clear(); for (int j = 0; j < 10000; j++) { intList.Add(j % 10); } Parallel.For(0, intList.Count, j => { if (intList[j] == 0) { doubleList.Add(0.0); } }); if (doubleList.Count != 1000) { Console.WriteLine("On iteration " + i + ": List size = " + doubleList.Count); } } Console.WriteLine("\nPress any key to exit."); Console.ReadKey(); } } }

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• Determine which process (b)locks a file, programmatically (under Windows >= XP)

  - by fred-hh

  How to programmatically determine from a process P, which other process P' has a lock on a file, that prevents P from recreating that file ? I know there are tools to do that, but how do they achieve that ? (Context: a batch program that runs overnight fails because of a locked file. Running an admin tool the next day may be too late to get useful information. So it would be nice if the batch program itself was able to determine the culprit.) EDIT: Added complexity: the file resides on a DFS and P' might not run on the same machine as P (but maybe does). But a solution that works locally would be a good beginning.

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• Parallel For Loop - Problems when adding to a List

  - by Kevin Crowell

  I am having some issues involving Parallel for loops and adding to a List. The problem is, the same code may generate different output at different times. I have set up some test code below. In this code, I create a List of 10,000 int values. 1/10th of the values will be 0, 1/10th of the values will be 1, all the way up to 1/10th of the values being 9. After setting up this List, I setup a Parallel for loop that iterates through the list. If the current number is 0, I add a value to a new List. After the Parallel for loop completes, I output the size of the list. The size should always be 1,000. Most of the time, the correct answer is given. However, I have seen 3 possible incorrect outcomes occur: The size of the list is less than 1,000 An IndexOutOfRangeException occurs @ doubleList.Add(0.0); An ArgumentException occurs @ doubleList.Add(0.0); The message for the ArgumentException given was: Destination array was not long enough. Check destIndex and length, and the array's lower bounds. What could be causing the errors? Is this a .Net bug? Is there something I can do to prevent this from happening? Please try the code for yourself. If you do not get an error, try it a few times. Please also note that you probably will not see any errors using a single-core machine. using System; using System.Collections.Generic; using System.Threading.Tasks; namespace ParallelTest { class Program { static void Main(string[] args) { List<int> intList = new List<int>(); List<double> doubleList = new List<double>(); for (int i = 0; i < 250; i++) { intList.Clear(); doubleList.Clear(); for (int j = 0; j < 10000; j++) { intList.Add(j % 10); } Parallel.For(0, intList.Count, j => { if (intList[j] == 0) { doubleList.Add(0.0); } }); if (doubleList.Count != 1000) { Console.WriteLine("On iteration " + i + ": List size = " + doubleList.Count); } } Console.WriteLine("\nPress any key to exit."); Console.ReadKey(); } } }

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• Failure remediation strategy for File I/O

  - by Brett

  I'm doing buffered IO into a file, both read and write. I'm using fopen(), fseeko(), standard ANSI C file I/O functions. In all cases, I'm writing to a standard local file on a disk. How often do these file I/O operations fail, and what should the strategy be for failures? I'm not exactly looking for stats, but I'm looking for a general purpose statement on how far I should go to handle error conditions. For instance, I think everyone recognizes that malloc() could and probably will fail someday on some user's machine and the developer should check for a NULL being returned, but there is no great remediation strategy since it probably means the system is out of memory. At least, this seems to be the approach taken with malloc() on desktop systems, embedded systems are different. Likewise, is it worth reattempting a file I/O operation, or should I just consider a failure to be basically unrecoverable, etc. I would appreciate some code samples demonstrating proper usage, or a library guide reference that indicates how this is to be handled. Any other data is, of course, welcome.

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• c source code to remove subset transactions form text file

  - by user324887

  I have a file containing data as follows 10 20 30 40 70 20 30 70 30 40 10 20 29 70 80 90 20 30 40 40 45 65 10 20 80 45 65 20 I want to remove all subset transaction from this file. output file should be like follows 10 20 30 40 70 29 70 80 90 20 30 40 40 45 65 10 20 80 Where records like 20 30 70 30 40 10 20 45 65 20 are removed because of they are subset of other records.

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• removing a line from a text file?

  - by Blackbinary

  Hi all. I am working with a text file, which contains a list of processes under my programs control, along with relevant data. At some point, one of the processes will finish, and thus will need to be removed from the file (as its no longer under control). Here is a sample of the file contents (which has enteries added "randomly"): PID=25729 IDLE=0.200000 BUSY=0.300000 USER=-10.000000 PID=26416 IDLE=0.100000 BUSY=0.800000 USER=-20.000000 PID=26522 IDLE=0.400000 BUSY=0.700000 USER=-30.000000 So for example, if I wanted to remove the line that says PID=26416.... how could I do that, without writing the file over again? I can use external unix commands, however I am not very familiar with them so please if that is your suggestion, give an example. Thanks!

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• applying apply() to deeply embeded list elements only

  - by romunov

  I would like to apply my function to only elements that are deeper in the list structure. For example, I would like to apply a certain function to list elements of second order only. Is this feasible with apply()? > str(l) List of 3 $ :List of 2 ..$ : num 5 ..$ : num 10 $ :List of 2 ..$ : num 15 ..$ : num 20 $ :List of 2 ..$ : num 25 ..$ : num 30

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