又被坑了,总算解决了,要睡了长话短说。首先,着重强调 Device Class GUID, Device Interface Class GUID, Interface GUID是有区别的,另外奉上两篇MSDN文章:
http://msdn.microsoft.com/en-us/library/windows/hardware/ff553412(v=vs.85).aspx
http://msdn.microsoft.com/en-us/library/windows/hardware/ff553428(v=vs.85).aspx
Device Class GUID 是INF文件中Verison Section中指名的设备类GUID,他标志着此设备图标,此设备出现在哪一栏,电压电流等各种信息。

Interface GUID是指驱动程序中的GUID, 用于使用API打开此设备进行一系列读写操作,API代码如下(FINDSTR_USB_DEVICE即为我驱动程序中使用的GUID):
1 //得到设备的句柄
2 HDEVINFO info=SetupDiGetClassDevs((LPGUID)&FINDSTR_USB_DEVICE,NULL,NULL,DIGCF_PRESENT|DIGCF_INTERFACEDEVICE);
3 if(info==INVALID_HANDLE_VALUE)
4 {
5 AfxMessageBox("No HDEVINFO avaliable for this GUIDn");
6 return ;
7 }
8
9 SP_INTERFACE_DEVICE_DATA ifdata;
10 ifdata.cbSize=sizeof(ifdata);
11 DWORD instance=0;
12 if(!SetupDiEnumDeviceInterfaces(info,NULL,(LPGUID)&FINDSTR_USB_DEVICE,instance,&ifdata))
13 {
14 AfxMessageBox("No SP_INTERFACE_DEVICE_DATA available for this GUID instance");
15 SetupDiDestroyDeviceInfoList(info);
16 return ;
17 }
18
19 //得到符号链接名
20 DWORD ReqLen;
21 SetupDiGetDeviceInterfaceDetail(info,&ifdata,NULL,0,&ReqLen,NULL);
22 PSP_INTERFACE_DEVICE_DETAIL_DATA ifDetail=(PSP_INTERFACE_DEVICE_DETAIL_DATA)new char[ReqLen];
23 if(ifDetail==NULL)
24 {
25 AfxMessageBox("Error 1");
26 SetupDiDestroyDeviceInfoList(info);
27 return ;
28 }
29 ifDetail->cbSize=sizeof(SP_INTERFACE_DEVICE_DETAIL_DATA);
30 if(!SetupDiGetDeviceInterfaceDetail(info,&ifdata,ifDetail,ReqLen,NULL,NULL))
31 {
32 AfxMessageBox("Error 2");
33 SetupDiDestroyDeviceInfoList(info);
34 delete ifDetail;
35 return ;
36 }
37 char buff[256]={0};
38 char * format="Symbolic link is %sn";
39 sprintf(buff,format,ifDetail->DevicePath);
40 HANDLE rv=CreateFile(ifDetail->DevicePath,
41 GENERIC_READ|GENERIC_WRITE,
42 FILE_SHARE_READ|FILE_SHARE_WRITE,
43 NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL|FILE_FLAG_OVERLAPPED,NULL);
44 //end of 得到设备句柄
45 delete ifDetail;
46 SetupDiDestroyDeviceInfoList(info);
47
48 hDevice=rv;
49 DWORD ThreadId;
50 hThread=CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)UpDate,this,0,&ThreadId);
51 m_EchoLed1.EnableWindow(TRUE);
52 m_EchoLed2.EnableWindow(TRUE);
53 m_OpenDevice.SetWindowText("关闭设备");
Device Interface Class GUID是Microsoft定义用来调用RegisterDeviceNotification时所使用的一类GUID,关于Microsoft所定义的所有Devcie Interface Class GUID 可以参看上面给出的网址,下面给出这类GUID的使用方法(用于动态检测某类USB设备的插入与拔出):
1 //注册 某个USB设备接口类 事件
2 GUID zz = {0xA5DCBF10, 0x6530, 0x11D2, 0x90, 0x1F, 0x00, 0xC0, 0x4F, 0xB9,
3 0x51, 0xED};
4 DEV_BROADCAST_DEVICEINTERFACE DevBroadcastDeviceInterface;
5
6 DevBroadcastDeviceInterface.dbcc_size = sizeof(DevBroadcastDeviceInterface);
7 DevBroadcastDeviceInterface.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
8 DevBroadcastDeviceInterface.dbcc_classguid = zz;
9 RegisterDeviceNotification(m_hWnd, &DevBroadcastDeviceInterface,
10 DEVICE_NOTIFY_WINDOW_HANDLE);
注:上述三种GUID没有任何实质上的关联,不能混为一谈。
GUID(A5DCBF10-6530-11D2-901F-00C04FB951ED)写成代码为
static const GUID x_guid = { 0xA5DCBF10, 0x6530, 0x11D2, 0x90, 0x1F, 0x00, 0xC0, 0x4F, 0xB9, 0x51, 0xED };