BOOL CXXX::OnCommand(WPARAM wParam, LPARAM lParam)
{
　　if (HIWORD(wParam) == BN_CLICKED)　　//判断是否是单击消息
　　{
	switch (wParam)
	{
	case 1:
		break;

	case 2:
		break;

	case 3:
		break;

	case 4:
		break;

	case 5:
		break;
	}
　　}
　　　　return TRUE;
}

CWnd::OnCommand

This method is called by the framework when the user selects an item from a menu, when a child control sends a notification message, or when an accelerator keystroke is translated.

virtual BOOL OnCommand( 
WPARAM wParam, 
LPARAM lParam );

Parameters

wParam

The low-order word of wParam identifies the command ID of the menu item, control, or accelerator. The high-order word of wParam specifies the notification message if the message is from a control. If the message is from an accelerator, the high-order word is 1. If the message is from a menu, the high-order word is 0.

lParam

Identifies the control that sends the message if the message is from a control. Otherwise, lParam is 0.

Return Value

An application returns nonzero if it processes this message; otherwise, it is zero.

OnCommand()

原文：http://www.cnblogs.com/wuguoqiang/p/5955922.html