X11 Programming: Get notified if new window appeared?

Question

programming in C with the X11 library, is there a way to get notified if a new window has appeared? I found XSetAfterFunction but its intended for debugging purposes only ...

Thanks for your help!

Heinrich

@edit:

This code solves my problem

int main() {    
Display* display = XOpenDisplay(":2");

XSetWindowAttributes attributes;
attributes.event_mask = SubstructureNotifyMask | StructureNotifyMask;

XChangeWindowAttributes(display, 0x100, CWEventMask, &attributes);

while (true) {
    XEvent event;
    XNextEvent(display, &event);
    std::cout << "Event occured" << std::endl;
}

return 0;
}

Answer 1

从内存中，您可以使用XChangeWindowAttributes从根窗口侦听事件，然后根据您的“新窗口出现”的定义，对XMapEvent（或XCreateWindowEvent或whateverEvent）执行操作。