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// Example get-active-window reads the _NET_ACTIVE_WINDOW property of the root
// window and uses the result (a window id) to get the name of the window.
package main
import (
"fmt"
"log"
"github.com/BurntSushi/xgb"
)
func main() {
X, err := xgb.NewConn()
if err != nil {
log.Fatal(err)
}
// Get the window id of the root window.
root := X.DefaultScreen().Root
// Get the atom id (i.e., intern an atom) of "_NET_ACTIVE_WINDOW".
aname := "_NET_ACTIVE_WINDOW"
activeAtom, err := X.InternAtom(true, uint16(len(aname)), aname).Reply()
if err != nil {
log.Fatal(err)
}
// Get the atom id (i.e., intern an atom) of "_NET_WM_NAME".
aname = "_NET_WM_NAME"
nameAtom, err := X.InternAtom(true, uint16(len(aname)), aname).Reply()
if err != nil {
log.Fatal(err)
}
// Get the actual value of _NET_ACTIVE_WINDOW.
// Note that 'reply.Value' is just a slice of bytes, so we use an
// XGB helper function, 'Get32', to pull an unsigned 32-bit integer out
// of the byte slice. We then convert it to an X resource id so it can
// be used to get the name of the window in the next GetProperty request.
reply, err := X.GetProperty(false, root, activeAtom.Atom,
xgb.GetPropertyTypeAny, 0, (1<<32)-1).Reply()
if err != nil {
log.Fatal(err)
}
windowId := xgb.Id(xgb.Get32(reply.Value))
fmt.Printf("Active window id: %X\n", windowId)
// Now get the value of _NET_WM_NAME for the active window.
// Note that this time, we simply convert the resulting byte slice,
// reply.Value, to a string.
reply, err = X.GetProperty(false, windowId, nameAtom.Atom,
xgb.GetPropertyTypeAny, 0, (1<<32)-1).Reply()
if err != nil {
log.Fatal(err)
}
fmt.Printf("Active window name: %s\n", string(reply.Value))
}
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