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Is there any difference with the X11 atoms XA_WM_NAME and “_NET_WM_NAME”?

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问题 Is there any difference with the atom defined in XA_WM_NAME defined in Xatom.h and the one got using XInternAtom(display, "_NET_WM_NAME", False) ? Edit: I made a little program which prints the integer value of both and I got: _NET_WM_NAME: 312, XA_WM_NAME: 39 , so, they represent different atoms. What are the differences? Thanks. 回答1: They are different atoms, but they both represent the title of the window. _NET_WM_NAME is part of the newer XDG/freedesktop.org window manager spec. Like

How to stop an X11 event loop gracefully asynchronously

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I have a small X11 application which has two threads. In one thread, I am listening to X11 events using XGrabKey() and then in a loop XNextEvent() . The other thread is doing other stuff and is not related to X11. Here's the code of the relevant thread: #include <X11/Xlib.h> #include <X11/Xutil.h> #include <X11/XF86keysym.h> #include <stdbool.h> #include <stdio.h> #include <string.h> volatile bool loop = true; void keyGrab(void) { Display *display = XOpenDisplay(0); Window root = DefaultRootWindow(display); int keycode = XKeysymToKeycode(display, XF86XK_AudioPlay); XGrabKey(display, keycode,

How to set mouse cursor on X11 in a C application

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I've got a rather large and rather old C application that has been ported to Linux. I'm in charge of getting mouse cursors to work correctly, but having some issues. I was able to convert most of the cursors we require to using the standard cursors provided by XFontCursor by using something like: gCursorTable[waitCurs] = XCreateFontCursor(gDisplay, XC_watch); ... XDefineCursor(gDisplay, WHostWindow(w), gCursorTable[cursor]); XFlush(gDisplay); This is fine for cursors which have analogs in the extremely limited list of (useful) cursors that XFontCursor provides, but there are other built in

xcb keyboard button masks meaning

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问题 I'm trying to figure what keys are handled by: XCB_MOD_MASK_1 XCB_MOD_MASK_2 XCB_MOD_MASK_3 XCB_MOD_MASK_4 XCB_MOD_MASK_5 in xcb, for XCB_MOD_MASK_1 it seems to be Alt (i'm correct?), but for others button i cannot find the mapping anywhere (i tried to google them before posting, but with no success). So what are the usual key associated to these masks? 回答1: Usually Mask1 is Alt or Meta, Mask2 is Num lock, Mask3 is AltGr, Mask4 is Win, and Mask5 is Scroll lock, but this varies between X

With X11, how can I get the user's time “away from keyboard” while ignoring certain events?

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问题 I'm making a little application that needs to know how long the user has been idle — as in, not using a keyboard or a mouse. Both XCB and Xlib promise to give me idle time through their respective screensaver extensions. Here is where I get idle time with XCB: #include <stdlib.h> #include <xcb/xcb.h> #include <xcb/screensaver.h> static xcb_connection_t * connection; static xcb_screen_t * screen; /** * Connects to the X server (via xcb) and gets the screen */ void magic_begin () { connection =

X11: list top level windows

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So far I've found two approaches: For each root window (default screen, specific screen, all screens, etc), list each immediate child. Search each immediate child recursively for a window with the WM_STATE property; that window becomes the top-level application window of the immediate child and all recursion can stop. If no window within the hierarchy of the immediate child has the WM_STATE property, assume the immediate child is itself the top-level application window. Use xcb_get_property , and xcb_query_tree (which despite the name lists only immediate children). This is what xlsclients

How to avoid tearing with pygame on Linux/X11

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问题 I've been playing with pygame (on Debian/Lenny). It seems to work nicely, except for annoying tearing of blits (fullscreen or windowed mode). I'm using the default SDL X11 driver. Googling suggests that it's a known issue with SDL that X11 provides no vsync facility (even with a display created with FULLSCREEN|DOUBLEBUF|HWSURFACE flags), and I should use the "dga" driver instead. However, running SDL_VIDEODRIVER=dga ./mygame.py throws in pygame initialisation with pygame.error: No available

Programmatically launching standalone Adobe flashplayer on Linux/X11

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问题 The standalone flashplayer takes no arguments other than a .swf file when you launch it from the command line. I need the player to go full screen, no window borders and such. This can be accomplished by hitting ctrl+f once the program has started. I want to do this programmatically as I need it to launch into full screen without any human interaction. My guess is that I need to some how get a handle to the window and then send it an event that looks like the "ctrl+f" keystroke. If it makes

Embedding QWidget into X11 Window

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问题 I want to embed two QWidgets into a window created using XLib. I have written this code: // Assume all the necessary headers included int main(int argc, char *argv[]) { QApplication app(argc, argv); // Create widget 1 QWidget widget1 ; widget1.setGeometry(44,44,666,666); widget1.show(); // Create widget 2 QWidget widget2 ; widget2.setGeometry(144,144,666,666); widget2.show(); Display *display = XOpenDisplay( 0 ); // 0 parameter for default values if ( display != NULL ) { // Create the x11

How to display java swing on X11 when running on Mac

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I would really like to be able to run our test suite on Xvfb so that swing windows don't keep popping up in the way of my work. Unfortunately I cannot seem to find a way to get the java runtime to use the display specified in the DISPLAY environment variable. I suppose this is because the Mac JDK is hardwired to use the (non-X-based) Mac display. I can't find any switches for the java command that say to use X either. Thanks in advance for any help you can give! Matt I don't know if there is a way to get Apple's JDK to use X11, but there is the alternative of using SoyLatte , which is a Mac