USB 设备热插拔的检测

关于USB设备的热插拔，网上已有不少相关的文档，这里总结下，基本上分为两大类：

1.通过WM_DEVICECHANGE消息检测USB设备（包括手机、USB网卡等）由RegisterDeviceNotification来注册消息，如果需要检测多个设备，

这里就注册多个GUID。

2.通过SHChangeNotifyRegister注册消息来检测设备（U盘、移动硬盘等）；

具体方法如下：

（1） 添加消息映射

#define WM_SHNOTIFY WM_USER + 100  //监控计算机目录消息ID

BEGIN_MESSAGE_MAP(CDYDirTreeCtrl, CDYTreeCtrl)
ON_WM_DEVICECHANGE()
ON_MESSAGE(WM_SHNOTIFY, OnComputerMonitor) 

END_MESSAGE_MAP()

（2）注册消息

//监控计算机目录实现部分

void CDYDirTreeCtrl::SetComputerMonitor()

{
PIDLIST_ABSOLUTE pidlWatch;
SHGetFolderLocation(NULL,CSIDL_DRIVES,NULL,NULL,&pidlWatch);

int const nSources = SHCNRF_ShellLevel | SHCNRF_InterruptLevel | SHCNRF_NewDelivery; 

SHChangeNotifyEntry shcne;
shcne.fRecursive = TRUE;
shcne.pidl = pidlWatch; 

m_hNotify = SHChangeNotifyRegister(this->GetSafeHwnd(), nSources, SHCNE_MEDIAINSERTED|SHCNE_MEDIAREMOVED|SHCNE_DRIVEADD|SHCNE_DRIVEREMOVED, WM_SHNOTIFY, 1, &shcne);  // SHCNE_ALLEVENTS
CoTaskMemFree(pidlWatch);

DEV_BROADCAST_DEVICEINTERFACE NotificationFilter;
ZeroMemory( &NotificationFilter, sizeof(NotificationFilter) );
NotificationFilter.dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE);
NotificationFilter.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
// assume we want to be notified with USBSTOR
// to get notified with all interface on XP or above
// ORed 3rd param with DEVICE_NOTIFY_ALL_INTERFACE_CLASSES and dbcc_classguid will be ignored
DY_GUID guidUSBdy = DYGuidFromString(_T("A5DCBF10-6530-11D2-901F-00C04FB951ED"));
GUID guidUSB;guidUSBdy.GetGuid(guidUSB);
NotificationFilter.dbcc_classguid = guidUSB;//GUID_DEVINTERFACE_USBSTOR;GUID_DEVINTERFACE_USB_DEVICE  见 "usbiodef.h"中定义；
m_hDevNotify = RegisterDeviceNotification(this->GetSafeHwnd(),&NotificationFilter, DEVICE_NOTIFY_WINDOW_HANDLE); 
if( !hDevNotify ) {
// error handling...
int err = GetLastError();
}

m_bComputerMonitor = TRUE;

}

（3）响应消息

//检测硬盘 存储设备

LRESULT CDYDirTreeCtrl::OnComputerMonitor(WPARAM wParam, LPARAM lParam)

{
CString strPath;
GetPath(strPath);
ShowTree();

}

//检测USB手机

BOOL CDYDirTreeCtrl::OnDeviceChange(UINT wParam, DWORD_PTR lParam)

{
CDYTreeCtrl::OnDeviceChange(wParam, lParam);

  if ( DBT_DEVICEARRIVAL == wParam || DBT_DEVICEREMOVECOMPLETE == wParam ) {

  PDEV_BROADCAST_HDR pHdr = (PDEV_BROADCAST_HDR)lParam;

  switch( pHdr->dbch_devicetype ) {

  case DBT_DEVTYP_DEVICEINTERFACE:

  {

  PDEV_BROADCAST_DEVICEINTERFACE pDevInf = (PDEV_BROADCAST_DEVICEINTERFACE)pHdr;

  if (wParam == DBT_DEVICEARRIVAL)//插入USBdev

  {

 

  }else if (wParam == DBT_DEVICEREMOVECOMPLETE)//拔出USBDEV

  {

 

  }

 

  OnComputerMonitor(0,0);

 

  }

  break;

  

  case DBT_DEVTYP_VOLUME:

  //PDEV_BROADCAST_VOLUME pDevVolume = (PDEV_BROADCAST_VOLUME)pHdr;

  // do something...

  break;

  }

  }

return FALSE;

}

（4）取消注册

SHChangeNotifyDeregister(m_hNotify);

UnregisterDeviceNotification(m_hDevNotify );

参考链接：http://blog.csdn.net/wzy198852/article/details/52343819
https://www.codeproject.com/Articles/14500/Detecting-Hardware-Insertion-and-or-Removal