system() simply passes its argument to the shell (on Unix-like systems, usually /bin/sh). Try this: int a = system(“python -m plotter &”); Of course the value returned by system() won’t be the exit status of the python script, since it won’t have finished yet. This is likely to work only on Unix-like systems (probably including … Read more
Environment variables are specific to the operating system. Properties are JVM only.
system() starts a new process. This new process changes its current directory, then ends. The current directory of your program’s process does not change. You want chdir() (or _chdir()).
I am the author of JIntellitype and I can tell you for a fact this must be done natively in DLL and called from Java JNI just like JIntellitype does it. This is an OS level hook that is not implemented in the JDK so libraries like JIntellitype and jxGrabKey must be used. As far … Read more
_posixsubprocess The file you are referencing is a Python module written in C. It’s not a “stub” file. The real implementation can be found in the stdlib at Modules/_posixsubprocess.c. You can see how writing a C/C++ extension is written by having a look at Building C and C++ Extensions. This should help you understanding the … Read more
First read: Concurrency vs Parallelism – What is the difference? Concurrency is the separation of tasks to provide interleaved execution. Parallelism is the simultaneous execution of multiple pieces of work in order to increase speed. —https://github.com/servo/servo/wiki/Design Short answer: With threads, the operating system switches running threads preemptively according to its scheduler, which is an algorithm … Read more
OK, found the answer here: Refreshing the display from a widget? Basically, have to make a transparent activity that processes the brightness change. What’s not mentioned in the post is that you have to do: Settings.System.putInt(y.getContentResolver(),Settings.System.SCREEN_BRIGHTNESS_MODE, 0); Settings.System.putInt(y.getContentResolver(),Settings.System.SCREEN_BRIGHTNESS, brightnessLevel); then do WindowManager.LayoutParams lp = getWindow().getAttributes(); lp.screenBrightness = brightness; getWindow().setAttributes(lp); And if you call finish() right … Read more
Perl’s system function has two modes: taking a single string and passing it to the command shell to allow special characters to be processed taking a list of strings, exec’ing the first and passing the remaining strings as arguments In the first form you have to be careful to escape characters that might have a … Read more
Add 2>&1 to the end of your command to redirect errors from stderr to stdout. This should make it clear what’s going wrong.
You can get the localized display name with the SHGetFileInfo API: public static string GetDisplayName(Environment.SpecialFolder specialFolder) { IntPtr pidl = IntPtr.Zero; try { HResult hr = SHGetFolderLocation(IntPtr.Zero, (int) specialFolder, IntPtr.Zero, 0, out pidl); if (hr.IsFailure) return null; SHFILEINFO shfi; if (0 != SHGetFileInfo( pidl, FILE_ATTRIBUTE_NORMAL, out shfi, (uint)Marshal.SizeOf(typeof(SHFILEINFO)), SHGFI_PIDL | SHGFI_DISPLAYNAME)) { return shfi.szDisplayName; } … Read more