给出了一个通过SendMessage关闭和打开显示器的示例。结论是调用该函数的参数应该为：

SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, cmd)

其中cmd仅取下列值有效：typedef enum { MONITOR_ON = -1,MONITOR_OFF = 2, MONITOR_STANBY = 1} eMonitorCMD

否则被自动忽略。

纠正了许多文献的不全或错误。



但是对于我的笔记本如果在待机过程中合上显示器，下次恢复时必须重新合上一次显示器再打开；上述程序时效，不知道什么原因，有人说这是一个BUG。本机系统为WindowsXP，T61 thinkpad。-Gives a SendMessage example of to control the display. Concluded that the parameters of the function call should be: SendMessage (HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, cmd)　which only take the following values of cmd effective: typedef enum (MONITOR_ON =-1, MONITOR_OFF = 2, MONITOR_STANBY = 1) eMonitorCMD　otherwise be automatically neglected. To correct a number of incomplete or incorrect documentation. But for my notebook during the standby if the display closed, the next recovery time must be re-closed and then open the display　spent above procedure, I do not know why, it is said that this is a BUG. The local system to WindowsXP, T61 thinkpad.