private void Initialize()
{
int lastError = ErrorHelpers.GetLastError();
Data[ErrorCodeKey] = lastError;
Data[ErrorMessageKey] = ErrorHelpers.GetErrorMessage(lastError);
}
protected override bool LoadValue(DeviceInfo deviceInfo, out DeviceRegistryPropertyType propertyType, out Api.Buffer buffer)
{
if (!SetupDi.GetDeviceRegistryProperty(deviceInfo, Key, out propertyType, out buffer))
{
// Only "not found" errors are valid failures.
var lastError = ErrorHelpers.GetLastError();
if (lastError == ErrorCode.NotFound)
{
return(false);
}
// Everything else is an unexpected failure.
throw new DeviceManagerWindowsException("Unable to query device registry property.");
}
return(true);
}
public IEnumerable <DeviceInfo> GetDevices()
{
for (var index = 0; ; ++index)
{
DeviceInfo deviceInfo;
if (!SetupDi.EnumDeviceInfo(this, index, out deviceInfo))
{
if (ErrorHelpers.GetLastError() != ErrorCode.NoMoreItems)
{
throw new DeviceManagerWindowsException("Unable to enumerate devices.");
}
yield break;
}
yield return(deviceInfo);
}
}
