如何获取设备的设备接口 GUID？

Question

我列举了一台机器上的所有设备如下：

HDEVINFO hDevList = SetupDiGetClassDevs( NULL, NULL, NULL, DIGCF_DEVICEINTERFACE | DIGCF_PRESENT | DIGCF_ALLCLASSES /*| DIGCF_PROFILE*/ );
for ( int i = 0; true; ++i )
{
    SP_DEVINFO_DATA devinfo_data = {0};
    devinfo_data.cbSize = sizeof(SP_DEVINFO_DATA);
    if ( !SetupDiEnumDeviceInfo( hDevList, i, &devinfo_data ) )
        break;
    //TODO: get device interface GUID
    //...
}
SetupDiDestroyDeviceInfoList( hDevList );

如何获取每个项目的设备接口 GUID？

我试过了

SP_DEVICE_INTERFACE_DATA interface_data = {0};
interface_data.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA);
SetupDiEnumDeviceInterfaces( hDevList, &devinfo_data, ???, 0, &interface_data );

但第三个参数似乎需要实际的 GUID。这实际上是我想要得到的！ NULL 不是一个选项。

Answer 1

您可以使用 Vista 及更高版本中的Unified Device Property Model 获取大量信息。它具有DEVPKEY_Device_Class 和DEVPKEY_Device_ClassGuid 属性：

HDEVINFO list = SetupDiGetClassDevs(NULL, NULL, NULL, DIGCF_DEVICEINTERFACE | DIGCF_PRESENT | DIGCF_ALLCLASSES /*| DIGCF_PROFILE*/);
for (int i = 0; true; ++i)
{
  SP_DEVINFO_DATA data = { 0 };
  data.cbSize = sizeof(SP_DEVINFO_DATA);
  if (!SetupDiEnumDeviceInfo(list, i, &data))
    break;

  // get name property
  DEVPROPTYPE type;
  DWORD size = 0;
  SetupDiGetDeviceProperty(list, &data, &DEVPKEY_NAME, &type, NULL, 0, &size, 0);
  if (size > 0)
  {
    LPWSTR name = (LPWSTR)malloc(size);
    SetupDiGetDeviceProperty(list, &data, &DEVPKEY_NAME, &type, (PBYTE)name, size, &size, 0);
    wprintf(L"name: %s\n", name);
    free(name);
  }

  // get class name
  SetupDiGetDeviceProperty(list, &data, &DEVPKEY_Device_Class, &type, NULL, 0, &size, 0);
  if (size > 0)
  {
    LPWSTR name = (LPWSTR)malloc(size);
    SetupDiGetDeviceProperty(list, &data, &DEVPKEY_Device_Class, &type, (PBYTE)name, size, &size, 0);
    wprintf(L" class: %s\n", name);
    free(name);
  }

  // get class guid
  SetupDiGetDeviceProperty(list, &data, &DEVPKEY_Device_ClassGuid, &type, NULL, 0, &size, 0);
  if (size > 0)
  {
    GUID* guid = (GUID*)malloc(size);
    SetupDiGetDeviceProperty(list, &data, &DEVPKEY_Device_ClassGuid, &type, (PBYTE)guid, size, &size, 0);
    wchar_t name[64];
    StringFromGUID2(*guid, (LPOLESTR)name, ARRAYSIZE(name));
    wprintf(L" class guid: %s\n", name);
    free(guid);
  }
}
SetupDiDestroyDeviceInfoList(list);

这将输出如下内容：

name: ACPI Fan                                      
 class: System                                      
 class guid: {4D36E97D-E325-11CE-BFC1-08002BE10318} 
name: ACPI Fan                                      
 class: System                                      
 class guid: {4D36E97D-E325-11CE-BFC1-08002BE10318} 
name: ACPI Fan                                      
 class: System                                      
 class guid: {4D36E97D-E325-11CE-BFC1-08002BE10318} 
name: ACPI Fan                                      
 class: System                                      
 class guid: {4D36E97D-E325-11CE-BFC1-08002BE10318} 
name: ACPI Fan                                      
 class: System                                      
 class guid: {4D36E97D-E325-11CE-BFC1-08002BE10318} 
name: Microsoft Hyper-V Virtual Machine Bus Provider
 class: System                                      
 class guid: {4D36E97D-E325-11CE-BFC1-08002BE10318} 
name: Plug and Play Software Device Enumerator      
 class: System                                      
 class guid: {4D36E97D-E325-11CE-BFC1-08002BE10318} 
etc...