Question

我对X11编程很陌生。

我尝试了以下代码来显示创建的新窗口的窗口ID，但它显示两次窗口ID（不同的窗口ID）。我正在使用FVWM（fvwm套接字）创建的每个新窗口都是正确的。如果我从命令启动firefox，那么它会显示大约5次窗口。

我想为每个新窗口创建一次正确的窗口ID，而不是两次。

#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”的输出。

[root@localhost 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

以下是从“xprop”命令

符合相同的内容

[root@localhost src]# xclock &
[2] 6564
[root@localhost 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"
[root@localhost src]#

在Linux中只创建一个新窗口（例如xclock或firefox）时，您是否知道显示Window id的代码段。

Answer 1

大多数窗口管理员重新设置新的顶层窗口来管理边框/顶部栏/按钮。我很确定你看到的是应用程序窗口id + wm窗口id。您可以通过查看窗口的所有者pid来检查它 - 它位于_NET_WM_PID poroperty（label1）中 - 请参阅How to convert a X11 window id to a process id

使用X11的窗口ID

1 个答案: