Hi, I want to call a funtion to open a file. I find the three function: sp_file_open_dialog(*parent, NULL, NULL); sp_file_new_default(); sp_file_open( path, NULL)； But when I call these funtions in another thread, it crash inkscape. Is there any required initialization before I call these this function? My program block is like to : ==== bool InkDBus::openFile(const string& path){ bool result = true; bool create_new = true; list< SPDesktop* > desktops; list< SPDesktop* >::iterator iter; inkscape_get_all_desktops(desktops); iter = desktops.begin(); SPDesktop* desktop = *iter; Gtk::Window *parent = desktop->getToplevel(); sp_file_open_dialog(*parent, NULL, NULL); return result; } ==== Thanks first for reading this letter :-) sincerely, Mat.