查找句柄要单击（通过使用 FindWindowEx ）的按钮，只要发送点击消息：

Find the handle to the button that you want to click (by using FindWindowEx), and just send click message:

SendMessage(hButton, WM_LBUTTONDOWN, MK_LBUTTON, MAKELPARAM(0, 0));
SendMessage(hButton, WM_LBUTTONUP, MK_LBUTTON, MAKELPARAM(0, 0));