电源通知 RequestPowerNotifications

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电源通知 RequestPowerNotifications

2019-07-13 23:30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);

}

转载地址： http://blog.csdn.net/jmunic/archive/2009/10/26/4728172.aspx

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