CM_Enumerate_Classes function (cfgmgr32.h)
The CM_Enumerate_Classes function, when called repeatedly, enumerates the local machine's installed device classes by supplying each class's GUID.
Syntax
CMAPI CONFIGRET CM_Enumerate_Classes(
[in] ULONG ulClassIndex,
[out] LPGUID ClassGuid,
[in] ULONG ulFlags
);
Parameters
[in] ulClassIndex
Caller-supplied index into the machine's list of device classes. For more information, see the Remarks section.
[out] ClassGuid
Caller-supplied address of a GUID structure (described in the Microsoft Windows SDK) to receive a device class's GUID.
[in] ulFlags
Beginning with Windows 8, callers can specify the following flags:
CM_ENUMERATE_CLASSES_INSTALLER
Enumerate device setup classes.
CM_ENUMERATE_CLASSES_INTERFACE
Enumerate device interface classes.
Otherwise, should be set to zero.
Return value
If the operation succeeds, the function returns CR_SUCCESS. Otherwise, it returns one of the CR_-prefixed error codes defined in Cfgmgr32.h.
Remarks
To enumerate the local machine's device classes, call CM_Enumerate_Classes repeatedly, starting with a ulClassIndex value of zero and incrementing the index value with each subsequent call until the function returns CR_NO_SUCH_VALUE. Some index values might represent list entries containing invalid class data, in which case the function returns CR_INVALID_DATA. This return value can be ignored.
The class GUIDs obtained from this function can be used as input to the device installation functions.
Beginning with Windows 8 and later operating systems, callers can use the ulFlags member to specify which device classes CM_Enumerate_Classes should return. Prior to Windows 8, CM_Enumerate_Classes returned only device setup classes.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available in Microsoft Windows 2000 and later versions of Windows. |
| Target Platform | Desktop |
| Header | cfgmgr32.h (include Cfgmgr32.h) |
| Library | Cfgmgr32.lib |
| DLL | Cfgmgr32.dll |