Windows 系统下，设备连接至电脑或从电脑移除，系统会广播一条 WM_DEVICECHANGE 消息到所有应用程序，在程序的消息处理函数中可以对事件进行相应。
1: class CMainDlg : public CDialogImpl<CMainDlg> {
2: public:
3: enum { IDD = IDD_MAINDLG };
4:
5: BEGIN_MSG_MAP(CMainDlg)
6: ......
7: MESSAGE_HANDLER(WM_DEVICECHANGE, OnDeviceChange)
8: END_MSG_MAP()
9:
10: LRESULT OnDeviceChange(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled) {
11: if(wParam == DBT_DEVICEARRIVAL) {
12: PDEV_BROADCAST_HDR pHdr = (PDEV_BROADCAST_HDR)lParam;
13: if(pHdr->dbch_devicetype == DBT_DEVTYP_DEVICEINTERFACE) {
14: PDEV_BROADCAST_DEVICEINTERFACE pDevInf = (PDEV_BROADCAST_DEVICEINTERFACE)pHdr;
15: CString dbcc_name = pDevInf->dbcc_name;
16: if(dbcc_name.Find(_T("VID_xxxx&PID_xxxx")) != -1) {
17: MessageBox("特定设备已插入");
18: }
19: }
20: } else if(wParam == DBT_DEVICEREMOVECOMPLETE) {
21: PDEV_BROADCAST_HDR pHdr = (PDEV_BROADCAST_HDR)lParam;
22: if(pHdr->dbch_devicetype == DBT_DEVTYP_DEVICEINTERFACE) {
23: PDEV_BROADCAST_DEVICEINTERFACE pDevInf = (PDEV_BROADCAST_DEVICEINTERFACE)pHdr;
24: CString dbcc_name = pDevInf->dbcc_name;
25: if(dbcc_name.Find(_T("Ven_USBKey&Prod_USBKey")) != -1) {
26: MessageBox("特定设备已拔出");
27: }
28: }
29: }
30: return 0;
31: }
32: }