connectSignal 
          fun VoidPointer.connectSignal(signal: String, callbackWrapper: COpaquePointer? = null, handler: GCallback = staticNoArgGCallback, flags: UInt): gulong
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Parameters
signal
Signal name
handler
Static C Function that will take event directly from the GTK library, should invoke callbackWrapper
callbackWrapper 
Passed as the data parameter to g_signal_connect_data. Invoked by handler
flags
Flags