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The GetDeviceCount method retrieves the number of devices installed but not necessarily physically present.
Syntax
HRESULT GetDeviceCount(
  DWORD*  pdwCount
);
Parameters
pdwCount
[out] Pointer to a double word containing the count of known devices.
Return Values
If the method succeeds, it returns S_OK. If it fails, it returns an HRESULT error code.
| Return code | Description | 
| E_INVALIDARG | The pdwCount parameter is an invalid or NULL pointer. | 
| E_FAIL | An unspecified error occurred. | 
See Also
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