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ATL Server Library Reference 
ATL_DS_CONN_STRING_LEN 

This macro defines the maximum length of data source connection names.


#define ATL_DS_CONN_STRING_LEN 512

The ATL_DS_CONN_STRING_LEN macro, unless redefined, resolves to 512, limiting data source connection strings to 512 characters including the null terminator.

Header: atlcache.h