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  • How to calculate checksum?

    - by Patel Rikin
    I m developing instrument driver and i want to know how to calculate checksum of frame. Explanation: Expressed by characters [0-9] and [A-F]. Characters beginning from the character after [STX] and until [ETB] or [ETX] (including [ETB] or [ETX]) are added in binary. The 2-digit numbers, which represent the least significant 8 bits in hexadecimal code, are converted to ASCII characters [0-9] and [A-F]. The most significant digit is stored in CHK1 and the least significant digit in CHK2. This is sample frame : <STX>2Q|1|2^1||||20011001153000<CR><ETX><CHK1><CHK2><CR><LF> and i want to know what is value of chk1 and chk2 and i am new in this so i m totally blank about how to calculate checksum i am not getting above 3rd and 4th point. can any one provide sample code for c#. Please help me.

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  • SSL23_WRITE:ssl handshake failure:s23_lib.c:177

    - by Armin
    When attempting to connect to an xmpp server over SSL, openssl fails with the following error: 3071833836:error:140790E5:SSL routines:SSL23_WRITE:ssl handshake failure:s23_lib.c:177 I believe that the server uses the RC4-MD5 cipher, here is the full output: [root@localhost ~]# openssl s_client -connect 184.106.52.124:5222 -cipher RC4-MD5 CONNECTED(00000003) >>> SSL 2.0 [length 0032], CLIENT-HELLO 01 03 03 00 09 00 00 00 20 00 00 04 01 00 80 00 00 ff b0 c9 c2 3f 0b 0e 98 df b4 dc fe b7 e8 8f 17 9a 34 b5 9b 17 1b 2b ac 01 dc bd 2b a9 2d 18 44 0c 3071866604:error:140790E5:SSL routines:SSL23_WRITE:ssl handshake failure:s23_lib.c:177: --- no peer certificate available --- No client certificate CA names sent --- SSL handshake has read 0 bytes and written 52 bytes --- New, (NONE), Cipher is (NONE) Secure Renegotiation IS NOT supported Compression: NONE Expansion: NONE --- Using gnutls-cli: [root@localhost ~]# gnutls-cli 184.106.52.124 -p 5222 Resolving '184.106.52.124'... Connecting to '184.106.52.124:5222'... *** Fatal error: A TLS packet with unexpected length was received. *** Handshake has failed GNUTLS ERROR: A TLS packet with unexpected length was received. Connecting to the same server on port 5223 works fine. Using OpenSSL 1.0.1e-fips on CentOS 6.5 and OpenSSL 1.0.1f on Ubuntu 14.04.1 Any tips on how to troubleshoot this? Thanks in advance.

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  • Why does OS X insist on spinning up all external drives when loading a file from the local drive?

    - by Phillip Oldham
    Why does OS X insist on spinning up all the attached external drives (firewire, usb) when loading a file from the local (internal) drive? It's driving me insane that I have to wait for 3 attached drives (1 back-up, 2 media) to spin up -- a total of 20s -- to access a file that is located only on my local/internal drive. There is no obvious need to access the other drives; nothing is being read from them and nothing need be written. Examples: Quicktime X opening a file from the local HDD. Starting Caffeine, an app which doesn't access any other files at all. Can I tell OS X to only spin those drives up when actually accessing them?

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  • How to reset Bash on Mac OSX, .bash_profile corrupted and bash no longer works

    - by user1463172
    I am on a MacBook Pro, running the latest version of Mountain Lion. I really need some help, I have managed some how to damage my .bash_profile (I think) so that every time I open up the terminal I get the error listed below. -bash: export: `/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/local/go/bin': not a valid identifier -bash: export: `/Users/rob/Applications/sbt/bin:': not a valid identifier env: bash: No such file or directory env: bash: No such file or directory env: bash: No such file or directory env: bash: No such file or directory env: bash: No such file or directory -bash: tar: command not found -bash: grep: command not found -bash: cat: command not found -bash: find: command not found I am not sure what has happened, I have no sudo, cd or any normal commands. The only way I have been able to get to any of the main directories is through the go to folder command in finder and try to find the file to no avail. To top it all off I think I created a file that might be causing the issue, I wanted to edit the .bash_profile so I typed sudo nano ./bash_profile This open a new file in nano which I think was then saved. After this I opened the real .bash_profile to add in the path for node.js. If I can get to the .bash_profile I think I can get it back on track but I can't find it, should I reinstall bash? If so how would I do that on a mac, I tried using brew install bash to which I get -bash: brew: command not found I am really stuck if anyone can help I would be really appreciated. Many thanks

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  • pfSense: How to route traffic out the WAN port?

    - by Ian Boyd
    Expert version i want to create a route in pfSense that will send traffic out the physical WAN port, not the PPPoE WAN port. i want to talk to talk to the web-server on my DSL modem, but it doesn't see packets wrapped in a PPPoE header. Long version My pfSense router is responsible for setting up the PPPoE connection over DSL to my ISP. When a machine on the LAN wants to sent packets to the internet, the default route sends packets out over the PPPoE connection. Those packets, wrapped in a PPPoE header, are sent on the ethernet cable to my DSL modem. From there they are sent the ISP, and the internet at large. i want a way to send a packet out the WAN port itself - not the PPPoE WAN port. My modem is sitting out there, with a http interface where i can monitor connection speed signal-to-noise ratio bandwidth connection time Whenever i try to set a route for destination of 192.168.2.1 (the IP that the modem will listen to for HTTP requests) to go out the WAN port, they instead end up going out the PPPoE port. The difference being that they're wrapped in a PPPoE protocol packet, and the modem isn't being sent the packet, it's being delivered to the ISP. Given that pfSense has no ability to direct traffic out the physical WAN port: how can i direct traffic out the physical WAN port on pfSense?

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  • How can I get realvnc to accept incoming connections in Windows 7?

    - by JosephStyons
    On a Vista machine, I can get the free version of RealVNC to accept incoming connections (i.e., other people can vnc to it). However, I have not been able to get it to work under Windows 7 - the client gets the below error when trying to connect. Has anyone else been able to get RealVNC to accept connections under Win7? VNC Viewer : Question read: Connection aborted (10053) Do you wish to attempt to reconnect to MACHINE_NAME? Yes No

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  • How to migrate from Natara DayNotez for Pocket PC / Windows Mobile

    - by piggymouse
    I've been using DayNotez as my notes manager since the old Palm PDA days. When I moved to Windows Mobile, I installed DayNotez there and migrated from the Palm version. Now I wish to move from DayNotez altogether (I currently consider Evernote as a decent cross-platform tool). Problem is, DayNotez doesn't let me export the notes (unless I want to transfer them one by one, which is a pain). Natara offers an export tool for Windows, but it only works for Palm HotSync (as it reads from the backed-up PDB file). DayNotez Desktop for Windows stores its local DB under "My Documents\Natara\DayNotez\" directory in a file named "[device name] DayNotez.dnz". Quick look within the file spots a string "Standard Jet DB" near the beginning, but I couldn't open it as a regular JET/MDB file. Any help would be greatly appreciated.

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  • Eclipse says "Access Denied" when running javaw and how to fix it?

    - by Eduardo de Luna
    I'm trying to get Eclipse to compile and run a HelloWorld class but it can't even do that. I have installed Eclipse x86 SDK 4.2.0 together bit with the latest JRE and JDK both in 64 bit as well. I also have the PATH variables set to respond to command prompts. When I try to run the following code: class HelloWorld { public static void main(String[] args) { System.out.println("Hello World!" ) ; } } And it returns the following error: Exception occurred executing command line. Cannot run program "C:\Program Files\Java\jre7\bin\javaw.exe" (in directory "C:\Users\Default\workspace\devs"): CreateProcess error=5, Access is denied. Can you help me fix this? Thanks!

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  • Monitor Mode on the Intel Centrino(R) Advanced-N 6205 (WEP Penetration) On Windows

    - by WindowsEscapist
    Can anyone tell me a way to do WEP hacking (legal, of course) (on my own wireless connection, for the purposes of this question) with Wireshark or similar programs on an Intel Centrino Advanced-N 6205? (Laptop is Acer Aspire 5750-6866.) According to the programs, I cannot accomplish this (monitor mode) but seeing as it is a fairly recent wireless card (should be able to support this) are there any cracked drivers available or does anyone have the knowledge to make one? Much appreciated! Thanks.

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  • Why does my Intel HDA onboard sound card not have a "Mix" device / channel?

    - by Hanno Fietz
    I want to be able to record what my sound card outputs on the speakers / headphones. This question is all over the interwebs again and again, and there seem to be two outcomes: in your selection of audio input devices, there's a device called "Stereo Mix", or similar, which is the "loopback" device for audio. Choose that in your recording tool and you're done. there's no such device and only speculative posts about why that may be. Now, I'm using ALSA and an Intel HDA chipset on my mainboard under Kubuntu Karmic. I have some 5-10 output channels and "Mic", "Front Mic" and "Line" for input. All of those are available in KMix, Audacity and other software. No "loopback" / "Mix" / whatever. Do I have to get some driver / kernel module set up ALSA in some way set up my system configuration in some way use a software solution (such as JACK) I had a look at JACK, and found it rather hard to understand, it's either an expert tool or just clumsy, I couldn't say. At least, I wasn't able to figure out how to achieve what I wanted. One of my problems seems to be that I don't understand where and how the mixing happens. Are there sound cards which just aren't able to do it? Why does the sound card matter at all, since I could in theory grab the data stream at some point before it goes to the hardware, right?

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  • Wine MFC80.DLL Issue

    - by Kush
    I am getting the following error when trying to run winetricks vcrun2005. "vcrun2005 install completed, but installed file /home/compuz/.wine/dosdevices/c:/windows/winsxs/x86_Microsoft.VC80.MFC_1fc8b3b9a1e18e3b_8.0.50727.6195_x-ww_150c9e8b/mfc80.dll not found" I then tried the following command: winetricks dlls list | grep mfc80 This gave the following output: vcrun2005 Visual C++ 2005 libraries (mfc80,msvcp80,msvcr80) (Microsoft, 2011) [downloadable,cached] Here mfc80 is colored red. This is the complete log: $ winetricks vcrun2005 Executing w_do_call vcrun2005 Executing load_vcrun2005 Executing mkdir -p /home/compuz/.cache/winetricks/vcrun2005 Using native,builtin override for following DLLs: msvcr80 Executing winetricks_early_wine regedit C:\windows\Temp\_vcrun2005\override-dll.reg Executing wine vcredist_x86.EXE fixme:advapi:DecryptFileA "C:\\users\\compuz\\Temp\\IXP000.TMP\\" 00000000 wine: Call from 0x7bc49070 to unimplemented function SHLWAPI.dll.SHRegGetValueW, aborting err:module:attach_process_dlls "urlmon.dll" failed to initialize, aborting err:module:LdrInitializeThunk Main exe initialization for L"C:\\windows\\system32\\msiexec.exe" failed, status 80000100 ------------------------------------------------------ vcrun2005 install completed, but installed file /home/compuz/.wine/dosdevices/c:/windows/winsxs/x86_Microsoft.VC80.MFC_1fc8b3b9a1e18e3b_8.0.50727.6195_x-ww_150c9e8b/mfc80.dll not found How can I fix this issue?

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  • Random software/shutdown problems Mac mini

    - by Oliver
    Hello I have a Mac mini using OS X 10.5.8. Recently I've been having problems that are becoming increasingly severe. Particular symptoms: Firefox "quits" but the dot on the dock remains. If I try shutting down at this point I can't and have to use the power button. I can't start Firefox either. Significantly higher than normal crash rate for CS4 Illustrator Photoshop and Dreamweaver. If Firefox remains open when sleeping the Mac, on waking up firefox is completely unresponsive and must be restarted. Can cause problem 1. Today I lost all my FTP settings for Dreamweaver CS4 Bluetooth switches on when booting despite being switched off. Network password retention is somewhat erractic. Tried running Apple Hardware Test as described in the manual. Cannot access install disk by pressing D at startup. My pen tablet (Bamboo) lost my preferences. Tried unstalling software and now cannot re-install. I've never had problems of this level outside warranty before so I don't know much about debugging Macs. Solutions attempted: Disable bluetooth (see problem 5) Disable time machine Run appple harware test (see problem 7) Tried using activity monitor but don't know which processes are normal Tried uninstalling more recent software. I don't have any idea what to do. It seems like a hard disk failure but I don't have the know how to continue.

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  • Missing Setup->VLAN on DD-WRT Web GUI?

    - by leeand00
    Please note that I've already posted this question on the dd-wrt forums. I am using "DD-WRT v24-sp2 (08/07/10) std" on a WZR-HP-G300NH model Buffalo router. I've found a number of tutorials online that talk about using Setup-VLAN on the menu system of the GUI interface to configure VLANs, but on my own router, it appears that VLAN configuration is located elsewhere; mainly in the Setup-Networking-VLAN Tagging section of the GUI. I would gladly just use the bash shell to configure the vlans on the router, but every tutorial I read refers to "changing the gui to reflect the changes made in the bash prompt". Are there any tutorials or documentation that you are aware of that that refer to the Setup-Networking-VLAN Tagging GUI portion of my router?

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  • Vmware 7 AppHangB1 on windows 7 x64 (host) and windows xp (guest)

    - by frabiacca
    I'm having an issue running Windows XP professional guests using Vmware workstation 7.0.0 build-203739 in a Windows 7 Ultimate 64 bit host. My platform is a Dell Studio XPS 13 with 6GB RAM with an x64 processor. The VMWare freezes for up to 90s every 15 - 20 minutes, then just carries on as if nothing happened! I've no idea what the problem is ... Any idea?

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  • Mac OS X bypass proxy for certain domains

    - by Brian
    In college I'm behind a proxy. When I try to visit one of my local Apache virtual hosts behind the proxy, then my college DNS attempts to resolve the host, thus bypassing my local host file. In the advanced setting for proxies you seem to be able to enter values into "Bypass proxy settings for these Hosts & Domains". I added the last 2 to the end - "*.local, 169.254/16, *.dev, *.sb". But it doesn't work. Is there a solution?

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  • Stuck part-way through installation of windows 7, upgrade product key, cannot cancel or finish installation

    - by user326520
    I'm trying to install Windows 7 (to get rid of Windows 8). I started the installation, cleared the minefield Microsoft has put in to stop me uninstalling 8, but forgot that my Windows 7 disk is an upgrade. So now I'm part-way through the 7 install. Can't go back, can't convince Microsoft that I have a valid key; I tried stopping the Windows 7 install and booting XP first, but I can't either - the unfinished Windows 7 install prevents that. Where's the way out? Update: Having spent some time with a Microsoft operative, I know why I can't install XP; this recent computer doesn't support IDE SATA mode, only AHCI. So the problem is: - straight install - key not valid - XP first before upgrade - XP cannot install due to newer HDD interface.

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  • Eclipse NullPointerException at getFontList

    - by Jan Fabry
    Eclipse doesn't start anymore. I get a dialog box that points me to a log file with the following entry: !SESSION 2009-12-08 08:49:16.263 ----------------------------------------------- eclipse.buildId=M20090917-0800 java.version=1.6.0_17 java.vendor=Apple Inc. BootLoader constants: OS=macosx, ARCH=x86_64, WS=cocoa, NL=en_US Framework arguments: -product org.eclipse.epp.package.php.product -keyring /Users/cheezy/.eclipse_keyring -showlocation Command-line arguments: -os macosx -ws cocoa -arch x86_64 -product org.eclipse.epp.package.php.product -keyring /Users/cheezy/.eclipse_keyring -showlocation !ENTRY org.eclipse.osgi 4 0 2009-12-08 08:49:19.993 !MESSAGE Application error !STACK 1 java.lang.NullPointerException at org.eclipse.swt.graphics.Device.getFontList(Device.java:369) at org.eclipse.jface.resource.FontRegistry.filterData(FontRegistry.java:465) at org.eclipse.jface.resource.FontRegistry.createFont(FontRegistry.java:499) at org.eclipse.jface.resource.FontRegistry.defaultFontRecord(FontRegistry.java:563) at org.eclipse.jface.resource.FontRegistry.getFontRecord(FontRegistry.java:673) at org.eclipse.jface.resource.FontRegistry.get(FontRegistry.java:613) at org.eclipse.jface.resource.JFaceResources.getDialogFont(JFaceResources.java:273) at org.eclipse.jface.dialogs.Dialog.initializeDialogUnits(Dialog.java:925) at org.eclipse.jface.dialogs.TitleAreaDialog.createContents(TitleAreaDialog.java:131) at org.eclipse.jface.window.Window.create(Window.java:431) at org.eclipse.jface.dialogs.Dialog.create(Dialog.java:1089) at org.eclipse.jface.window.Window.open(Window.java:790) at org.eclipse.ui.internal.ide.ChooseWorkspaceDialog.prompt(ChooseWorkspaceDialog.java:91) at org.eclipse.ui.internal.ide.application.IDEApplication.promptForWorkspace(IDEApplication.java:275) at org.eclipse.ui.internal.ide.application.IDEApplication.checkInstanceLocation(IDEApplication.java:223) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:103) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:194) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:368) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:559) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514) at org.eclipse.equinox.launcher.Main.run(Main.java:1311) I did clean up my font list in Font Book by disabling duplicate fonts. I also upgraded to Mac OS X 10.6.2.

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  • BIOS interrupts, priviledge levels and paging

    - by Jack
    Hi, I was learning about Intel 8086-80486 CPUs and their interactions with HW. But I still don´t understand it quite well. Please, help me fill blank spots. First, I know that CPU communicates with HW using BIOS interrupts. But, what really happens in PC, when I call some INT instruction? I know that according the interrupt table some instructions begin to execute, but how by executing some instructions can BIOS recognize what I want to do? Becouse as far as I know, CPU has no extra communication channel with BIOS, it can only adress memory and receive data. So how can I instruct BIOS to do something, when I can only adress RAM? Next thing I dont understand is about priviledge levels. I know about ring model, and acess rights, but how CPU knows which priviledge level has executed instruction? I think that these priviledges apply only when intruction is trying to adress memory, but how applications gets its priviledge level? I mean I know its level 3, but how its set? And last thing, I know that paging is adress scheme that is used to support aplication-transparent virtual memory, or swaping, but I could not find any informations about how is paging tied with protected mode. Like if paging is like next mode independent of protectet mode, or its somehow implemented within protected mode. And if it is implemented in protected mode, isn´t it too slow, to first adress application space, than offset, and than paging folder, page and offset once again? Thank you for every response.

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  • Repair Windows 7 MBR with Hiren's Boot CD

    - by Joshua Robison
    I would like to repair my Windows 7 MBR using Hiren's Boot CD 15.1. I want to know the generic method, using this CD, to fix an MBR that is hypothetically "toast". This hypothetical HD is as follows: 100 MB MBR partition 60 GB Windows 7 system Let's imagine there is an empty 100 MB partition and the MBR is corrupt beyond repair or completely not there and my only option is Hiren's Boot CD.

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