IVMVirtualMachine::GetActivationValue method
[Windows Virtual PC is no longer available for use as of Windows 8. Instead, use the Hyper-V WMI provider (V2).]
Retrieves the value of the specified activation setting for this virtual machine.
Syntax
HRESULT GetActivationValue(
[in] BSTR activationKey,
[out, retval] VARIANT *activationValue
);
Parameters
-
activationKey [in]
-
The key used to identify the activation value as stored in the "*.vmc" file.
-
activationValue [out, retval]
-
The activation value. This value can be one of the following VARIANT types: VT_ARRAY | VT_UI1 (raw bytes), VT_BSTR (string), VT_I4 (integer), or VT_BOOL (Boolean).
Return value
This method can return one of these values.
| Return code/value | Description |
|---|---|
|
The operation was successful. |
|
The activationKey parameter is NULL or empty. |
|
The activationValue parameter is NULL. |
|
The configuration is unknown. |
|
The preference was not found, or this configuration has no valid activation. |
|
An unexpected error has occurred. |
Remarks
This method provides low-level access to any activation value. It can be used to set activation values for customer-defined keys. When a virtual machine is started, a copy is made of its configuration values, which becomes its set of activation values. Activation values are maintained until the virtual machine is shut down or restarted. Note that Windows Virtual PC may only use the configuration to store values for certain keys, that is, the activation value may never be used.
Activation keys are stored internally in a hierarchical manner similar to the registry keys in Windows. To specify a specific subkey, a "key path" is constructed which specifies the various keys in a slash mark delimited format.
For example, to read the value of the "default_action" key located in the following key tree:
<settings>
<undo_drives>
<default_action type="integer">1</default_action>
The activationKey path string would be specified as follows:
"settings/undo_drives/default_action"
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client |
Windows 7 [desktop apps only] |
| Minimum supported server |
None supported |
| End of client support |
Windows 7 |
| Product |
Windows Virtual PC |
| Header |
|
| IID |
IID_IVMVirtualMachine is defined as f7092aa1-33ed-4f78-a59f-c00adfc2edd7 |