如何在服务程序中监听硬件事件

主要通过RegisterDeviceNotification函数来完成，网上一般能找到都是window程序，很少缺少服务程序的例子。

1. 从网上下载一个服务程序的框架。

2.svcmain 函数中

DEV_BROADCAST_DEVICEINTERFACE 
dev_broadcast_deviceinterface = {0};
    dev_broadcast_deviceinterface.dbcc_size =
sizeof(dev_broadcast_deviceinterface);
    dev_broadcast_deviceinterface.dbcc_devicetype =
DBT_DEVTYP_DEVICEINTERFACE;
    //dev_broadcast_deviceinterface.dbcc_name= NULL;
    dev_broadcast_deviceinterface.dbcc_reserved = 0;
    dev_broadcast_deviceinterface.dbcc_classguid =
GUID_DEVINTERFACE_NET;
    hDevNotify =
RegisterDeviceNotification(sshStatusHandle, &dev_broadcast_deviceinterface,DEVICE_NOTIFY_SERVICE_HANDLE);
    if(NULL==
hDevNotify)
    {
       //error handler
}

注意这里的变量是sshStatusHandle，类型是DEVICE_NOTIFY_SERVICE_HANDLE

SERVICE_STATUS_HANDLE  sshStatusHandle;

sshStatusHandle =
RegisterServiceCtrlHandlerEx(pService, (LPHANDLER_FUNCTION_EX)svc_ctrl,
NULL);

窗口程序用的是窗口的句柄，服务程序这里用的是SERVICE_STATUS_HANDLE类型，具体就是从RegisterServiceCtrlHandlerEx函数的返回值。

要收到DEVICEEVENT消息需要使用RegisterServiceCtrlHandlerEx，而不是RegisterServiceCtrlHandler

switch(dwCtrlCode)

    {
        case
SERVICE_CONTROL_STOP:
        case
SERVICE_CONTROL_SHUTDOWN:
            ssStatus.dwWin32ExitCode = 0;

            ssStatus.dwCurrentState =
SERVICE_STOP_PENDING;
            ssStatus.dwCheckPoint   = 0;

            ssStatus.dwWaitHint     = 0;
            SetServiceStatus(sshStatusHandle, &ssStatus);
            // terminate all processesstarted by this service before shutdown
            SetEvent(ghRegStopEvent);
            SetEvent(ghSvcStopEvent);
            break;
        case
SERVICE_CONTROL_PAUSE:
            ssStatus.dwCurrentState =
SERVICE_PAUSED;
            svc_stop(0);
            break;
        case
SERVICE_CONTROL_CONTINUE:
            ssStatus.dwCurrentState =
SERVICE_RUNNING;
            svc_stop(1);
            break;
        case
SERVICE_CONTROL_INTERROGATE:
            break;
        case
SERVICE_CONTROL_DEVICEEVENT:
            //我们关注的消息
 OutputDebugStringA("hello world"
            break;     
        default:
         break;

 

If dwControlis SERVICE_CONTROL_DEVICEEVENT, this parameter can beone of the following values:
·        DBT_DEVICEARRIVAL
·        DBT_DEVICEREMOVECOMPLETE
·        DBT_DEVICEQUERYREMOVE
·        DBT_DEVICEQUERYREMOVEFAILED
·        DBT_DEVICEREMOVEPENDING
·        DBT_CUSTOMEVENT
·        lpEventData
·        Additional device information, ifrequired. The format of this data depends on the value of the
dwControland dwEventType parameters. If dwEventType isSERVICE_CONTROL_DEVICEEVENT, this data corresponds to the
lParamparameter that applications receive as part of a WM_DEVICECHANGEmessage. If
dwEventType is SERVICE_CONTROL_POWEREVENT, this data is apointer to a
POWERBROADCAST_SETTING structure. If dwEventType isSERVICE_CONTROL_SESSIONCHANGE, this parameter is a pointer to a
WTSSESSION_NOTIFICATIONstructure.
从这里可以知道lpEventData类型windows消息的lParam参数，dwControls是具体的类型，根据类型来设置结构体指针就可以正常处理了。