我對X11編程非常陌生。使用X11的窗口ID
我試過下面這段代碼來顯示創建的新窗口的窗口標識,但它顯示的窗口標識兩次(不同的窗口標識)。我得到正確的,一次只爲使用FVWM(fvwm套接字)創建的每個新窗口。如果我從命令啓動firefox,那麼它會顯示5次左右的窗口。
我想爲每個新窗口創建一次而不是兩次顯示正確的窗口標識。
#include <stdio.h>
#include <stdlib.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
int main()
{
Display* display = XOpenDisplay(":0");
XSetWindowAttributes attributes;
// attributes.event_mask = SubstructureNotifyMask | StructureNotifyMask;
attributes.event_mask = SubstructureNotifyMask | VisibilityChangeMask | EnterWindowMask;
attributes.backing_store = Always;
Window win = XDefaultRootWindow(display);
printf("Deafult root window %x\n", win);
XChangeWindowAttributes(display, win, CWEventMask, &attributes);
while (1)
{
XEvent event;
XNextEvent(display, &event);
if (event.type == CreateNotify)
{
puts("create Notify event occured\n");
printf("Window ID: %x\n", event.xcreatewindow.window);
printf("Window ID: %d\n", event.xcreatewindow.window);
printf("Parent Window ID: %x\n", event.xcreatewindow.parent);
}
}
}
以下是「xclock」的輸出。
[[email protected] src]# ./XWindow.out
create Notify event occured
Window ID: 3e0000c
Window ID: 65011724
create Notify event occured
Window ID: 100118f
Window ID: 16781711
create Notify event occured
以下是符合從「xprop」命令相同
[[email protected] src]# xclock &
[2] 6564
[[email protected] src]# xprop
_NET_WM_STATE(ATOM) =
WM_STATE(WM_STATE):
window state: Normal
icon window: 0x0
_NET_WM_DESKTOP(CARDINAL) = 0
_NET_FRAME_EXTENTS(CARDINAL) = 1, 1, 39, 1
_NET_WM_ALLOWED_ACTIONS(ATOM) = _NET_WM_ACTION_MOVE, _NET_WM_ACTION_RESIZE, _NET_WM_ACTION_FULLSCREEN, _NET_WM_ACTION_MINIMIZE, _NET_WM_ACTION_SHADE, _NET_WM_ACTION_MAXIMIZE_HORZ, _NET_WM_ACTION_MAXIMIZE_VERT, _NET_WM_ACTION_CHANGE_DESKTOP, _NET_WM_ACTION_CLOSE, _NET_WM_ACTION_ABOVE, _NET_WM_ACTION_BELOW
_NET_WM_PID(CARDINAL) = 6564
WM_PROTOCOLS(ATOM): protocols WM_DELETE_WINDOW
SM_CLIENT_ID(STRING) = "10b83f0cefdd07ca73150167045190887900000031930078"
WM_CLIENT_LEADER(WINDOW): window id # 0x3e0000c
WM_LOCALE_NAME(STRING) = "C"
WM_CLASS(STRING) = "xclock", "XClock"
WM_HINTS(WM_HINTS):
Client accepts input or input focus: False
Initial state is Normal State.
bitmap id # to use for icon: 0x3e00001
bitmap id # of mask for icon: 0x3e00003
WM_NORMAL_HINTS(WM_SIZE_HINTS):
program specified size: 164 by 164
window gravity: NorthWest
WM_CLIENT_MACHINE(STRING) = "localhost.localdomain"
WM_COMMAND(STRING) = { "xclock" }
WM_ICON_NAME(STRING) = "xclock"
WM_NAME(STRING) = "xclock"
[[email protected] src]#
你有一段代碼任何想法,這顯示無論何時創建新的窗口(如XCLOCK或Firefox)窗口ID Linux只有一次。
還有很多窗口比您所看到的還多。您將一直獲得關於invisiblle windiws的createnotify事件。您需要仔細制定您想要通知哪些窗口。如果您想要可見的頂級窗口,您需要註冊SubstructureNotify掩碼並觀察MapNotify事件,然後可能會獲取新創建的窗口屬性並過濾出完全在屏幕外的那些屬性。 –