這樣觸發系統事件： 
IntPtr hBackLightEvent = CreateEvent(IntPtr.Zero, false, true, "BackLightChangeEvent"); 
if (hBackLightEvent != IntPtr.Zero) 
{ 
EventModify(hBackLightEvent,3); 
CloseHandle(hBackLightEvent); 
} 

[DllImport("coredll.dll", SetLastError=true)] 
public static extern IntPtr CreateEvent(IntPtr lpEventAttributes, bool bManualReset, bool bInitialState, string lpName); 
[DllImport("coredll.dll", SetLastError=true)] 
public static extern bool EventModify(IntPtr hEvent, int ef); 
[DllImport("coredll.dll", SetLastError=true)] 
public static extern bool CloseHandle(IntPtr hObject); 



smartphone的背光控制

反匯編了peripheral.dll，想看看smartphone上的背光是如何控制的，了解了一點點
下面是相關的有名事件：
TIMEOUTDISPLAYOFFLCDONLY
TIMEOUTDISPLAYOFFHALF
TIMEOUTDISPLAYOFF
MONITOR_PRESSED_ANYKEY
BackLightChangeEvent

可以在應用程序中使用這些事件


818+, 830 wm5 背光設置代碼

反匯編backlight.exe得到的，在mda compact ii上測試通過

如果背景關閉了（機器上開的），打開背光
void BackLightOn()
{
         HANDLE hBL=CreateEvent(NULL,FALSE,FALSE,L"BackLightChangeEvent");
         if(hBl != NULL)
        {
                   SetEvent(hBL);
                   CloseHandle(hBL);
        }
}

得到背光的亮度設置
int GetBackLightLevel()
{
            int iRet = -1;
            DWORD dwOut,dwRet;

            HANDLE h = CreateFile(TEXT("BKL1:"), GENERIC_READ|GENERIC_WRITE, 0,0,
                                                    OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL, 0); 
           if (h != INVALID_HANDLE_VALUE)
          {
                     if ( DeviceIoControl(h, 1 , 0, 0, &dwOut, sizeof(DWORD), &dwRet, 0))
                     {
                                iRet = dwOut;
                     }
                    CloseHandle(h);
          }
          return iRet;
}

設置背光亮度等級
BOOL GetBackLightLevel(DWORD dwLevel)
{
            BOOL bRet = FALSE;
            DWORD dwRet;

            HANDLE h = CreateFile(TEXT("BKL1:"), GENERIC_READ|GENERIC_WRITE, 0,0,
                                                    OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL, 0); 
           if (h != INVALID_HANDLE_VALUE)
          {
                     if ( DeviceIoControl(h, 2 , &dwLevel, sizeof(DWORD), 0,0, &dwRet, 0))
                     {
                                bRet = TRUE;
                     }
                    CloseHandle(h);
          }
          return bRet;
}