Comments for Jopsen.dk/blog http://jopsen.dk/blog Thoughts mixed with random memory dumps... Wed, 11 Aug 2010 18:24:04 +0000 hourly 1 http://wordpress.org/?v=3.0.1 Comment on SimpleECDSA, a simple implementation of ECDSA in C by maxtin http://jopsen.dk/blog/2007/12/simpleecdsa-a-simple-implementation-of-ecdsa-in-c/comment-page-1/#comment-9599 maxtin Wed, 11 Aug 2010 18:24:04 +0000 http://jopsen.dk/blog/2007/12/simpleecdsa-a-simple-implementation-of-ecdsa-in-c#comment-9599 thank you Sir.. thank you Sir..

]]> Comment on SimpleECDSA, a simple implementation of ECDSA in C by Jonas Finnemann Jensen http://jopsen.dk/blog/2007/12/simpleecdsa-a-simple-implementation-of-ecdsa-in-c/comment-page-1/#comment-9541 Jonas Finnemann Jensen Mon, 02 Aug 2010 12:23:17 +0000 http://jopsen.dk/blog/2007/12/simpleecdsa-a-simple-implementation-of-ecdsa-in-c#comment-9541 @maxtin Asymmetric key algorithms, such as ECDSA, are used many in places today. Whenever you need secure communication without use of shared secrets, algorithms such as ECDSA or RSA are used. Asymmetric key algorithms are widely used for digital signatures, secure email (GPG) and secure internet (HTTPS). Take a look at: http://en.wikipedia.org/wiki/Public-key_cryptography @maxtin
Asymmetric key algorithms, such as ECDSA, are used many in places today. Whenever you need secure communication without use of shared secrets, algorithms such as ECDSA or RSA are used.

Asymmetric key algorithms are widely used for digital signatures, secure email (GPG) and secure internet (HTTPS).

Take a look at: http://en.wikipedia.org/wiki/Public-key_cryptography

]]> Comment on SimpleECDSA, a simple implementation of ECDSA in C by maxtin http://jopsen.dk/blog/2007/12/simpleecdsa-a-simple-implementation-of-ecdsa-in-c/comment-page-1/#comment-9537 maxtin Sun, 01 Aug 2010 19:13:45 +0000 http://jopsen.dk/blog/2007/12/simpleecdsa-a-simple-implementation-of-ecdsa-in-c#comment-9537 hello Jonas, i have chosen cryptography as the base for my project. i would like to know applications of cryptography. i mean... how can we use the ECDSA algorithms for real world applications? hello Jonas,
i have chosen cryptography as the base for my project. i would like to know applications of cryptography. i mean… how can we use the ECDSA algorithms for real world applications?

]]> Comment on ZBar bindings for C# by Varro http://jopsen.dk/blog/2009/12/zbar-bindings-for-c-sharp/comment-page-1/#comment-9532 Varro Sun, 01 Aug 2010 11:09:54 +0000 http://jopsen.dk/blog/?p=161#comment-9532 Thank you for the fast reply. Currently i'm working on windows system, trying to create a piece of code which makes the bmp and jpeg scanning (like bmp-scanner you made). Thank you for the advice and thank you for your library. Regards. Thank you for the fast reply.
Currently i’m working on windows system, trying to create a piece of code which makes the bmp and jpeg scanning (like bmp-scanner you made).
Thank you for the advice and thank you for your library.
Regards.

]]> Comment on ZBar bindings for C# by Jonas Finnemann Jensen http://jopsen.dk/blog/2009/12/zbar-bindings-for-c-sharp/comment-page-1/#comment-9505 Jonas Finnemann Jensen Wed, 28 Jul 2010 22:50:42 +0000 http://jopsen.dk/blog/?p=161#comment-9505 If you're on Windows: The video capture in zbar on Windows uses Video For Windows. A very old legacy API, you may wish to write your own capturing code that uses whatever is hot in Windows, probably DirectShow. And give the captured images to zbar... I have an example where I read a barcode in a BMP: http://github.com/jopsen/zbar-sharp/tree/master/example/bmp-scanner/ If you write such code please share... If you're on Linux, you can get the video device string from HAL. I did this using dbus, the code is available at http://jopsen.dk/blog/2009/12/foodolini-a-food-management-system/ However, HAL is being deprecated... So it's probably better to get it elsewhere. If you find out how, let me know... I don't know how to discover the PixelFormat, if you're talking about bmp from files, I suggest you find a bmp reader/parser or read the specification... - Best of luck... If you’re on Windows:
The video capture in zbar on Windows uses Video For Windows. A very old legacy API, you may wish to write your own capturing code that uses whatever is hot in Windows, probably DirectShow. And give the captured images to zbar…
I have an example where I read a barcode in a BMP:
http://github.com/jopsen/zbar-sharp/tree/master/example/bmp-scanner/

If you write such code please share…

If you’re on Linux, you can get the video device string from HAL. I did this using dbus, the code is available at http://jopsen.dk/blog/2009/12/foodolini-a-food-management-system/
However, HAL is being deprecated… So it’s probably better to get it elsewhere. If you find out how, let me know…

I don’t know how to discover the PixelFormat, if you’re talking about bmp from files, I suggest you find a bmp reader/parser or read the specification…

- Best of luck…

]]> Comment on ZBar bindings for C# by Varro http://jopsen.dk/blog/2009/12/zbar-bindings-for-c-sharp/comment-page-1/#comment-9502 Varro Wed, 28 Jul 2010 15:58:03 +0000 http://jopsen.dk/blog/?p=161#comment-9502 Any advice how to discover the PixelFormat of a bmp image and how to discover the video device string? Any advice how to discover the PixelFormat of a bmp image and how to discover the video device string?

]]> Comment on ZBar bindings for C# by birdi3 http://jopsen.dk/blog/2009/12/zbar-bindings-for-c-sharp/comment-page-1/#comment-9399 birdi3 Sat, 10 Jul 2010 15:43:15 +0000 http://jopsen.dk/blog/?p=161#comment-9399 Thanks for your reply! I had a play further yesterday (before reading your comment) and only got as far as hitting an error such as 'Unable to load DLL libzbar", despite having it renamed and in line with the binary, (ie in the debug folder, as well as in other locations as I tried to test it), but then managed to get this working by moving in the other dll's from ZBAR (..really should have done that first time round) With this in mind and your help above, I have since been able to get your example working! Huge thanks for the swift reply and good example, hopefully it will be very useful for others! Next challenge is to get it reading directly from the cam in Windows. Wish me luck and I hopefully wont be back too soon! :P Thanks Again Thanks for your reply!

I had a play further yesterday (before reading your comment) and only got as far as hitting an error such as ‘Unable to load DLL libzbar”, despite having it renamed and in line with the binary, (ie in the debug folder, as well as in other locations as I tried to test it), but then managed to get this working by moving in the other dll’s from ZBAR (..really should have done that first time round)

With this in mind and your help above, I have since been able to get your example working! Huge thanks for the swift reply and good example, hopefully it will be very useful for others! Next challenge is to get it reading directly from the cam in Windows. Wish me luck and I hopefully wont be back too soon! :P

Thanks Again

]]> Comment on ZBar bindings for C# by Jonas Finnemann Jensen http://jopsen.dk/blog/2009/12/zbar-bindings-for-c-sharp/comment-page-1/#comment-9392 Jonas Finnemann Jensen Fri, 09 Jul 2010 19:01:20 +0000 http://jopsen.dk/blog/?p=161#comment-9392 The example given should work with VS, but requires gtk-sharp, if you don't want to play install that I've pushed a new example (bmp-scanner) to github.com/jopsen/zbar-sharp. The bmp-scanner example is hard coded to the image it distributed with... But it works and shows how zbar-sharp can also be used. Remember to link against zbar-sharp in your project file, and put libzbar-sharp.dll and libzbar.dll next to the binary when running it. Note the binary libzbar.dll (the one from zbar.sf.net) may be named zbar.dll or libzbar-1.dll or something, but it needs to be renamed to libzbar.dll Let me know if have any problems building it... I don't have time to test it on a Windows VM right now... The example given should work with VS, but requires gtk-sharp, if you don’t want to play install that I’ve pushed a new example (bmp-scanner) to github.com/jopsen/zbar-sharp.

The bmp-scanner example is hard coded to the image it distributed with… But it works and shows how zbar-sharp can also be used.

Remember to link against zbar-sharp in your project file, and put libzbar-sharp.dll and libzbar.dll next to the binary when running it.

Note the binary libzbar.dll (the one from zbar.sf.net) may be named zbar.dll or libzbar-1.dll or something, but it needs to be renamed to libzbar.dll

Let me know if have any problems building it… I don’t have time to test it on a Windows VM right now…

]]> Comment on ZBar bindings for C# by birdi3 http://jopsen.dk/blog/2009/12/zbar-bindings-for-c-sharp/comment-page-1/#comment-9390 birdi3 Fri, 09 Jul 2010 15:09:12 +0000 http://jopsen.dk/blog/?p=161#comment-9390 Hey I've just spend 30mins or so trying to use your bindings in windows / visual studio but am yet to be successful. Any help you can give? example C# windows code perhaps? Thanks NB: Im trying to use your bindings to enable me to run ZBAR with C#, and to make an app to achieve something similar to that of yours above, ie shows web cam picture, detects barcode and then use that in the app. (bascially make the output of ZBAR usable in a c# proggy) Hey

I’ve just spend 30mins or so trying to use your bindings in windows / visual studio but am yet to be successful.

Any help you can give? example C# windows code perhaps?

Thanks
NB: Im trying to use your bindings to enable me to run ZBAR with C#, and to make an app to achieve something similar to that of yours above, ie shows web cam picture, detects barcode and then use that in the app. (bascially make the output of ZBAR usable in a c# proggy)

]]> Comment on “Der var engang” – Børnesommerlejr 2007 by Jopsen.dk/blog http://jopsen.dk/blog/2007/07/der-var-engang-b%c3%b8rnesommerlejr-2007/comment-page-1/#comment-9351 Jopsen.dk/blog Sat, 03 Jul 2010 15:42:18 +0000 http://jopsen.dk/blog/2007/07/der-var-engang-b%c3%b8rnesommerlejr-2007#comment-9351 [...] vældigt underholdende. Den mærkeligste post i år, som dog ikke var nær så sej som den vi havde sidste år, gik ud på at ungerne skulle løbe stafet og spise flødeboller undervejs. Flødeboller os ledere [...] [...] vældigt underholdende. Den mærkeligste post i år, som dog ikke var nær så sej som den vi havde sidste år, gik ud på at ungerne skulle løbe stafet og spise flødeboller undervejs. Flødeboller os ledere [...]

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