In addition to providing the code for the function in the file DRIVERNAME.C, a minidriver developer must also:
1.Check the RES_BO_CB_FILTER_GRX box in the fBlockOut dialog box.
From the Printer Data menu, choose the Graphics Info command. From the Graphics Info cascading menu, choose the Resolution command. From the
RESOLUTION dialog box, you can select the fBlockOut entry in the Resolution Bitwords list box. This displays the fBlockOut dialog box.
2.Export the BlockOut function (using an ordinal value of 300) in the EXPORTS section of the minidriver's module-definition file.
3.Import the WriteSpoolBuf function (using an ordinal value of 300) in the IMPORTS section of the minidriver's module-definition file.