tailieunhanh - Cracker Handbook 1.0 part 62

Tham khảo tài liệu 'cracker handbook part 62', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 5H FUNCTION Use To sequentially write and FCB file. Call registers AH 15H DS DX Pointer to an FCB already opened. Return registers AL 00H if there were no errors otherwise it will contain the error code 1 full disk or read-only file 2 error on the formation or on the specification of The 15H function dates the FCB after writing the register to the present block. 16H FUNCTION Use To create an FCB file. Call registers AH 16H DS DX Pointer to an already opened FCB. Return registers AL 00H if there were no errors otherwise it will contain the 0FFH value. It is based on the information which comes on an FCB to create a file on a disk. 21H FUNCTION Use To read in an random manner an FCB file. Call registers AH 21H DS DX Pointer to and opened FCB. Return registers A 00H if there was no error otherwise AH will contain the code of the error 1 if it is the end of file 2 if there is an FCB specification error and 3 if This function reads the specified register by the fields of the actual block and register of an opened FCB and places the information on the DTA Disk Transfer Area. 22H FUNCTION Use To write in an random manner an FCB file. Call registers AH 22H DS DX Pointer to an opened FCB. Return registers AL 00H if there was no error otherwise it will contain the error code 1 if the disk is full or the file is an only read and 2 if there is an error on the It writes the register specified by the fields of the actual block and register of an opened FCB. It writes this information from the content of the DTA. 3CH FUNCTION Use To create a file if it does not exist or leave it on 0 length if it exists Handle. Call registers AH 3CH CH File attribute DS DX Pointer to an ASCII specification. Return registers CF 0 and AX the assigned number to handle if there is no error in case there is CF ill be 1 and AX will contain the error code 3 path not found 4 there This function substitutes the 16H function. The name of the file is specified on an ASCII chain which has as a characteristic