如何通过发送消息使combobox的下拉框自动拉出来?

Question

SendMessage(ComboBox1.Handle,
            CB_SHOWDROPDOWN,        //显示下拉框
            1,                      // wParam: True--- Show;
                                               False -- Hide; 
            0);

Answer 1

SendMessage(ComboBox1.Handle,
            CB_SHOWDROPDOWN,        //显示下拉框
            1,                      // wParam: True--- Show;
                                               False -- Hide; 
            0);

Answer 2

sendmessage(combobox1.handle, CB_SHOWDROPDOWN,longint(true),0);

Answer 3

如果你知道它叫ComboBox1，
那还不如用ComboBox1.DropDown;