WRAPPER_API const BmgChar * get_SignatureFromFileCustom () const
Description
The get_SignatureFromFileCustom method returns the signature stored in the custom datasource file. The custom datasource is written out with a calculated signature value based on the current contents at the time it is saved. If the file is edited prior to being loaded, the signature calculated from the (edited) contents of the file will not match the value returned by this method, which is the signature saved in the file.