SetupAPI函数实现设备分类GUID和类名之间的转换SetupDiClassNameFromGuidEx和SetupDiClassGuidsFromNameEx

类名与其GUID之间的切换

        GUID guid;
        ULONG rtn = 0;
        if (SetupDiClassGuidsFromNameEx(TEXT("USB"), &guid, 1, &rtn, NULL, NULL))
        {
            rtn = rtn;
        }

返回：

 {36FC9E60-C465-11CF-8056-444553540000}

这和INF文件中的对应一致：

[Version]
Signature="$WINDOWS NT$"
Class=USB
ClassGuid={36FC9E60-C465-11CF-8056-444553540000}

当然也有一个反向的从GUI获取类名的函数SetupDiClassNameFromGuidEx

    {
        GUID guid;
        ULONG rtn = 0;
        if (SetupDiClassGuidsFromNameEx(TEXT("USB"), &guid, 1, &rtn, NULL, NULL))
        {
            rtn = rtn;
        }

        TCHAR GuidName[64] = { 0 };
        if (SetupDiClassNameFromGuidEx(&guid, GuidName, sizeof(GuidName), &rtn, NULL,NULL))
        {
            rtn = rtn;
        }
    }

GuidName返回USB字符串。

Windows预定义的设备分类和其对应的GUID详见：http://www.pnpon.com/article/detail-146.html