USB操作中如何通过GUID得到路径字符串呢？

NTRTS 2009-08-16 12:22:20

完全不懂，头都大了，唉...公司任务

查了很多资料，一点头绪都没有

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NTRTS 2009-08-16

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回答得真快...试试看

MoXiaoRab 2009-08-16

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这种帖子以前回答过，如下代码看看能不能搞定



HidD_GetHidGuid (&hidGUID); 



DeviceInfoSet = SetupDiGetClassDevs (&hidGUID, NULL, NULL, (DIGCF_PRESENT | DIGCF_DEVICEINTERFACE));     deviceInterfaceData.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA); 



if(DeviceInfoSet == INVALID_HANDLE_VALUE)

        printf("DeviceInfoSet is INVALID_HANDLE_VALUE\n"); 



result = SetupDiEnumDeviceInterfaces (DeviceInfoSet, NULL, &hidGUID, Index, &deviceInterfaceData);

if (result == FALSE)

        SetupDiDestroyDeviceInfoList (DeviceInfoSet);





SetupDiGetDeviceInterfaceDetail (DeviceInfoSet, &deviceInterfaceData, NULL, 0, &requiredSize, 0); 

deviceDetail = (PSP_INTERFACE_DEVICE_DETAIL_DATA)malloc(requiredSize);

deviceDetail->cbSize = sizeof(SP_INTERFACE_DEVICE_DETAIL_DATA);    

if(deviceDetail == NULL)

        printf("There is no enough memory space available for deviceDetail\n"); 



if (!SetupDiGetDeviceInterfaceDetail (DeviceInfoSet, &deviceInterfaceData, deviceDetail, requiredSize, &requiredSize, NULL)) 

{

        printf("SetupDiGetDeviceInterfaceDetail failed\n");

        SetupDiDestroyDeviceInfoList (DeviceInfoSet);

        free (deviceDetail);

        return INVALID_HANDLE_VALUE;

} 



printf("path: %s\n", deviceDetail->DevicePath);

deviceHandle = CreateFile (deviceDetail->DevicePath, 0, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);  



if(deviceHandle == INVALID_HANDLE_VALUE);

        printf("CreateFile open failed (%d)\n", GetLastError()); 



SetupDiDestroyDeviceInfoList (DeviceInfoSet);

free (deviceDetail);