Allocates a new #QmiMessageDmsWriteUserDataInput.
Get the 'User Data' field from self.
Atomically increments the reference count of self by one.
Set the 'User Data' field in the message.
a #GArray of #guint8 elements. A new reference to value_user_data will be taken, so the caller must make sure the array was created with the correct #GDestroyNotify as clear function for each element in the array.
Atomically decrements the reference count of self by one.
If the reference count drops to 0, self is completely disposed.
Allocates a new #QmiMessageDmsWriteUserDataInput.
The #QmiMessageDmsWriteUserDataInput structure contains private data and should only be accessed using the provided API.