Why am I getting this redefinition of class error?

You’re defining the class in the header file, include the header file into a *.cpp file and define the class a second time because the first definition is dragged into the translation unit by the header file. But only one gameObject class definition is allowed per translation unit. You actually don’t need to define the … Read more

What does %~dp0 mean, and how does it work?

Calling in the command-line gives help about this syntax (which can be used outside FOR, too, this is just the place where help can be found). In addition, substitution of FOR variable references has been enhanced. You can now use the following optional syntax: The modifiers can be combined to get compound results: In the … Read more

“inappropriate ioctl for device”

Most likely it means that the open didn’t fail. When Perl opens a file, it checks whether or not the file is a TTY (so that it can answer the -T $fh filetest operator) by issuing the TCGETS ioctl against it. If the file is a regular file and not a tty, the ioctl fails and sets errno to ENOTTY (string value: … Read more

create a white rgba / CSS3

The code you have is a white with low opacity. If something white with a low opacity is above something black, you end up with a lighter shade of gray. Above red? Lighter red, etc. That is how opacity works. Here is a simple demo. If you want it to look ‘more white’, make it less … Read more

What does enctype=’multipart/form-data’ mean?

When you make a POST request, you have to encode the data that forms the body of the request in some way. HTML forms provide three methods of encoding. application/x-www-form-urlencoded (the default) multipart/form-data text/plain Work was being done on adding application/json, but that has been abandoned. (Other encodings are possible with HTTP requests generated using other means … Read more

ImportError: numpy.core.multiarray failed to import

I’m trying to run this program But I’m having a problem with numpy, I’m using pyschopy along with opencv. The problem I keep getting is this error report: RuntimeError: module compiled against API version 7 but this version of numpy is 6 Traceback (most recent call last): File “C:\Users\John\Documents\EyeTracking\Programs\GetImage.py”, line 1, in ImportError: numpy.core.multiarray failed … Read more