打开驱动设备接口代码

//打开一个设备接口
 1 bool OpenDevice(GUID Guid, int maxInfNum)
 2 {
 3     HDEVINFO hwDevInfo = SetupDiGetClassDevs(&Guid, NULL, NULL, DIGCF_PRESENT|DIGCF_DEVICEINTERFACE);
 4     if ( INVALID_HANDLE_VALUE == hwDevInfo )
 5         return false;
 6     for ( unsigned int infIndex = 0; infIndex < maxInfNum; ++infIndex )
 7     {
 8         //Enum device interfaces
 9         SP_INTERFACE_DEVICE_DATA devData;
10         
11         //必须设置devData的cbSize，否则SetupDiEnumDeviceInterfaces调用会失败，GetLastError会返回1784
12         devData.cbSize = sizeof(SP_INTERFACE_DEVICE_DATA); 
13         if ( SetupDiEnumDeviceInterfaces(hwDevInfo,
14                                          NULL,
15                                          &Guid,
16                                          infIndex,
17                                          &devData))
18         {
19             DWORD symLinkLen = 0;
20             SetupDiGetDeviceInterfaceDetail(hwDevInfo, &devData, NULL, 0, &symLinkLen, NULL);
21             PSP_INTERFACE_DEVICE_DETAIL_DATA pDevDetailData = (PSP_INTERFACE_DEVICE_DETAIL_DATA)(new char[symLinkLen]);
22             
23             //必须设置devData的cbSize，否则SetupDiGetDeviceInterfaceDetail调用会失败，GetLastError会返回1784
24             pDevDetailData->cbSize = sizeof(SP_INTERFACE_DEVICE_DETAIL_DATA);
25             if ( !SetupDiGetDeviceInterfaceDetail(hwDevInfo,
26                                                   &devData,
27                                                   pDevDetailData,
28                                                   symLinkLen,
29                                                   &symLinkLen,
30                                                   NULL))
31             {
32                 AfxMessageBox("SetupDiGetDeviceInterfaceDetail() FAILD!");
33                 delete pDevDetailData;
34                 pDevDetailData = NULL;
35             }
36             else
37             {
38                 HANDLE deviceHandle = CreateFile(pDevDetailData->DevicePath,
39                                             GENERIC_READ|GENERIC_WRITE,
40                                             0,
41                                             NULL,
42                                             OPEN_EXISTING,
43                                             FILE_FLAG_OVERLAPPED,
44                                             NULL);
45                 if ( INVALID_HANDLE_VALUE != deviceHandle )
46                 {
47                     AfxMessageBox("CreateFile() OK!");
48                     return true;
49                 }
50             }
51         }
52         else
53         {
54             AfxMessageBox("SetupDiEnumDeviceInterfaces() FAILD!");
55             //SetupDiDestroyDeviceInfoList(m_hwDevInfo);
56             DWORD ErrorCode = GetLastError();
57         }
58         
59     }
60     return false;
61 }

Gomen

2012.10.11

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原文地址：https://www.cnblogs.com/gomen/p/2722006.html