电源通知 RequestPowerNotifications

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电源通知 RequestPowerNotifications

2019-07-13 23:20发布生成海报

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当系统的电源状态该变时，可以通过RequestPowerNotifications要求电源管理器向自己发送一个通知示例：

#include <windows.h>
#include <pm.h>
#include <Winbase.h>
 
#define MAX_NOTIFY_NAMELEN          128
#define PM_BROADCAST_QUEUE_SIZE     ((sizeof(POWER_BROADCAST) + (MAX_NOTIFY_NAMELEN * sizeof(WCHAR) ) ) )
 
#define SIZEOFARRAY(a)  (sizeof(a) / sizeof(a[0]))
 
void IlockDThreadProc(void)
{
     MSGQUEUEOPTIONS mqo;
     HANDLE hPowerMsgQ;
     HANDLE hPowerNotifications;
     DWORD cbRead;
    DWORD dwFlags;       
     DWORD cbPowerMsgSize =  PM_BROADCAST_QUEUE_SIZE;  
     DWORD dwPwrFlags;
    TCHAR szPowerState[32];
 
    
     POWER_BROADCAST ppb;
    union {                
         WCHAR buf[PM_BROADCAST_QUEUE_SIZE];
         POWER_BROADCAST powerBroadcast;
     } u;
 
     printf("IlockDThreadProc/n");
    
     mqo.dwSize = sizeof(MSGQUEUEOPTIONS);
    mqo.dwFlags = MSGQUEUE_NOPRECOMMIT;
    mqo.dwMaxMessages = 32;
    mqo.cbMaxMessage = cbPowerMsgSize;
    mqo.bReadAccess = TRUE;             
   
    hPowerMsgQ = CreateMsgQueue(NULL, &mqo);
    if (NULL == hPowerMsgQ) {
        printf("/r/n/r/nCreateMsgQueue failed: %x/n", GetLastError());
        goto Error;              
    }
   
hPowerNotifications = RequestPowerNotifications(hPowerMsgQ, PBT_ALL);
if (NULL == hPowerNotifications)    {
        printf("RequestPowerNotifications failed: %x/n", GetLastError());
        goto Error;
    }
 
    while(1)  {
    WaitForSingleObject(hPowerMsgQ,INFINITE);     
        
    if (!ReadMsgQueue(hPowerMsgQ, &u, cbPowerMsgSize, &cbRead, 0, &dwFlags))   {     
         printf("ReadMsgQueue failed: %x/n", GetLastError());
            ASSERT(FALSE);
        }         
 
         ppb = u.powerBroadcast;         
 
        switch(ppb.Message) {       
        case PBT_TRANSITION:                     
                   printf("##############################ppb.Message PBT_TRANSITION/n");
                       
                   GetSystemPowerState(szPowerState,SIZEOFARRAY(szPowerState),&dwPwrFlags);
                  
                  
                   if(!wcscmp(TEXT("backlightoff"),szPowerState)) {
                       printf("BacklightOff/n");
                        break;
                   }
 
                   if(!wcscmp(TEXT("unattended"),szPowerState))   {
                       printf("unattended/n");
                       break;
                   }
                  
              break;
        case PBT_RESUME:
                   printf("##############################ppb.Message PBT_RESUME/n");
              break;
        case PBT_POWERSTATUSCHANGE:
                   printf("************************ppb.Message PBT_POWERSTATUSCHANGE/n");
              break;
              case PBT_POWERINFOCHANGE:
                   printf("##############################ppb.Message PBT_POWERINFOCHANGE/n");
              break;
        default:
                   printf("##############################ppb.Message default/n");
              break;  
        }         
        
     }   
 
Error:
    if (hPowerMsgQ)
        CloseMsgQueue(hPowerMsgQ); 
    if (hPowerNotifications)
        StopPowerNotifications(hPowerNotifications); 
}
 
int _tmain(void)
{       
     CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)IlockDThreadProc,0,0,NULL);
 
     while(1) {
         Sleep(1000);
     }
}

转自：http://blog.csdn.net/jmunic/archive/2009/10/26/4728172.aspx 复制搜索复制搜索

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