To estimate average speed of travel between two close GPS points. A relatively simple method involves treating the globe as a sphere with a radius of 6378100 metres and calculating positions on this sphere for the two locations, of course the earth isn’t a sphere, but as we are aiming to calculate the speed of […]
If anybody is looking for a quick and dirty way of getting a list box to always scroll to its end then have a look here: http://stackoverflow.com/questions/10884031/wpf-raise-an-event-when-item-is-added-in-listview Take a look in Item #6, it worked well for me although I am aware that it may be seen somewhat as a hack – but then sometimes […]
I just came across this article from The Register that mentions that Amazon is making Nvidia GPU cores available: http://www.theregister.co.uk/2013/11/05/aws_gpu_grid_service/ Makes me think again about the possibilities of doing Computer Vision / Machine Vision in the cloud (taking advantage of GPGPU techniques via OpenCL etc.), however like most of Amazon’s stuff it would probably be […]
I had to hack the living daylights out of something today, and although I am not proud of it, needs must where the devil drives! I was using the boost generic image library (gil) for managing some camera images and using jpeg_write_view() for saving them as JPEGs. A requirement emerged to insert a comment into […]
If you are having problems with xiGetImage() sometimes failing and returning an error value of XI_INVALID_ARG (11) then it may be due to the state of the XI_IMG structure that you are passing into the call (the image pointer argument). The image object’s .size parameter must be set to sizeof(XI_IMG) and must not be 0. […]
Today I came across some strange behaviour with the VS2012 implementation of std::thread. The created thread’s job was to access the XIMEA camera API, one method of thread creation worked ok, and another only half worked. With the first mode the API could grab from multiple cameras as expected, while with the other it could […]
I thought this would be quite hard to achieve, but it turned out to be easy. I wanted my WPF windows app to run with a standard console output so that I could see all tat was written to stdout via printf() etc from some C code that is linked in to the WPF app […]
This question seems to produce some confusing and contradicting answers, however the short answer to it is ‘yes, you can’. You can use std::thread in unmanaged code in a C++/CLI project but not from managed code – but the good thing about C++/CLI is that you can mix managed and unamanaged code. if you try […]
If you want a particular role to see another’s unpublished posts in drupal, then the quickest (and possibility most dangerous) way of achieving this is to grant the role in question this permission: bypass content access control It sure aint pretty but it works, use at your own risk!
I came across this good article about how to program general purpose IO (GPIO) from user space code in Linux http://falsinsoft.blogspot.ie/2012/11/access-gpio-from-linux-user-space.html It contains a nice little synopsis of the steps involved with setting up and reading & writing inputs and outputs!