参数如何跨函数传递

client c;
void on_message ((type) hdl, (type) msg) {
  // 需要 WndProc 里面的 variables
}
signed wsClientMain ( ) { 
  ......
  c.set_message_handler(bind(&on_message, ::_1, ::_2));
  ......
  c.run( );
}
LRESULT CALLBACK WndProc ( params ) { // 这个是主函数
  define variables;
  ......
  wsClientMain ( );
  ......
}