DosQueryDBCSEnv obtains a double-byte character set environmental vector that resides in the country file (the default name is COUNTRY.SYS).

The vector returned corresponds to the system country code or selected country code, and to the process code page or selected code page.

A double-byte character set is for a code page that contains more than 256 characters. A DBCS data string may contain both SBCS (single-byte character set) and DBCS (double-byte character set) characters.

A DBCS character is two bytes in length. It contains a lead byte and a trail byte. A lead byte is in the range returned by DosQueryDBCSEnv. A trail byte is not restricted to any range. The trail byte always follows the lead byte in a DBCS character.