Something
public text v1 · immutable XID xHandle = GDK_WINDOW_XWINDOW(handle->window);
Display* mDisp = GDK_WINDOW_XDISPLAY(handle->window);
core::stringc dName = (long)mDisp;
dName += ':';
dName += (int)xHandle;
actual_params->WindowId = (long)dName.c_str();