Passive Input focus

[Peppino Incasa]

How can I set the input passive focus to my window? I have implemented this 
code but don't work.

XEvent ev;
Atom a1=XInternAtom(display,"WM_TAKE_FOCUS",0);
Atom a2=XInternAtom(display,"WM_PROTOCOLS",0);
        memset(&ev,0,sizeof(ev));
    ev.type=ClientMessage;
    ev.xclient.type = ClientMessage;
    ev.xclient.display=display;
    ev.xclient.window=window;
    ev.xclient.message_type=a2;
    ev.xclient.format=32;
    ev.xclient.data.l[0]=1;
    ev.xclient.data.l[1]=a1;
    XSendEvent(display,window,0,0,(XEvent *)&ev);

Thank you,
Peppino.

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