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For developing a web based scan solution, I would love to test it on Windows or Mac without actually hooking up a scanner to my box. So is there a program/tool that emulates or gives me a virtual twain source with some default image data?
The Twain sample driver that comes along with the twain sample application up on source forge should have what you're looking for.
http://sourceforge.net/projects/twain-samples/files/TWAIN%202%20Sample%20Application/
Yes, there are plenty of solutions for this. We are using TerminalWorks' UniTwain application. The users are very satisfied as it is pretty simple to use and it does it's job. This is the download link: http://www.terminalworks.com/unitwain
both of above are paid apps.
there is one open source:
http://sourceforge.net/projects/twain-samples/files/
you need Data Source, it adds virtual scanner, which gives you the file if asked.
dont know if the received sample file can be changed, but for testing its good.
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How do I access the system temperatures and fan speeds of a Mac using Objective-C? I have seen it done in applications like iStat, but I can not figure out how to do this. Does anyone know how?
You may also take a look at https://github.com/fmorrow/SMCWrapper - it's an object-oriented version of smc.c/smc.h. (The code of SMCWrapper is well commented)
Currently, it opens a connection using IOKit to AppleSMC IOService, and uses it to makes calls to the SMC chip. You can read keys to NSString, but setting key value is experimental at this time.
Take a look at https://github.com/lavoiesl/osx-cpu-temp/blob/master/smc.c for sample code that reads the temps from the SMC.
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I have a Mac App that uses the NSKeyedArchiver to save persistent data and it all works fine, but thinking ahead ideally I would like to be able to create a windows version. The current App is all in objective-c using cocoa as I did not think of portability when I first started writing it. I would be happy to make a windows version from scratch but obviously the two need to share data. I am a complete beginner when it come to cross-platform apps. What should I do?
Thanks in advance.
You either need to find (or write) code/a library to read NSKeyedArchiver plists on Windows, or you need to release an update to your Mac app that converts the keyed archives to something more generic, like a JSON- or XML-based format.
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I'm not sure how open the Mac platform is for 3rd party applications.
Would it be possible to write software that regulates internet usage?
Say I wanted to only allow internet usage between 5-6pm? Is that possible?
Any pointers on how to get started?
Yes. You can look at the Mac app Self Control:
http://visitsteve.com/made/selfcontrol/
This application disables a certain list of sites for a defined period of time. I know that the application uses the /etc/hosts file to disable access to these sites by setting all of these hosts to 127.0.0.1. Obviously a savvy user could override this method, but it works well.
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I have a requirement of recording video via web cam, on my webpage. What are the available plugins for the same. My website is developed using Ruby on Rails framework
Regards,
Pankaj
If an HTML5 solution could be suitable for you, you can take a look to WebRTC (currently supported in Chrome, Firefox and Opera).
You can find a good tutorial here:
http://www.html5rocks.com/en/tutorials/getusermedia/intro/
The first hit on searching "webcam plugin": http://www.xarg.org/project/jquery-webcam-plugin/
As it is using JavaScript it is easy to include in Rails.
Many others appear in the results ...
Another option is to use the Nimbb widget. There are a lot of tutorials showing how to embed it into a website.
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Finally i finished my web application and i am ready to show it to the world .. but first i need to a make a kind of demo video of the app, what tools would help me with such task ?
There will be video captures of the screen, some images off course and text ? any recommendations ?
Thanks in advance
Camtasia Studio is the gold standard for this kind of work and is very full featured, but it's a bit pricey. Somewhat more inexpensive and quite good but less full featured is My Screen Recorder Pro.
i think microsoft live meeting has a way to record meetings. What you do is to set up a live meeting with yourself( i know sounds stupid) and then you share your screen with the attendees (its you) and press record meeting. That should work.
But maybe there is something easier out there....