函数名: randbrd 功 能: 随机块读 用 法: int randbrd(struct fcb *fcbptr, int reccnt); #include #include #include #include int main(void) { char far *save_dta; char line, buffer; struct fcb blk; int i, result; /* get user input file name for dta */ printf("Enter drive and file name (no path - i.e. a:file.dat)\n"); gets(line); /* put file name in fcb */ if (!parsfnm(line, &blk, 1)) { printf("Error in call to parsfnm\n"); exit(1); } printf("Drive #%d File: %s\n\n", blk.fcb_drive, blk.fcb_name); /* open file with DOS FCB open file */ bdosptr(0x0F, &blk, 0); /* save old dta, and set new one */ save_dta = getdta(); setdta(buffer); /* set up info for the new dta */ blk.fcb_recsize = 128; blk.fcb_random = 0L; result = randbrd(&blk, 1); /* check results from randbrd */ if (!result) printf("Read OK\n\n"); else { perror("Error during read"); exit(1); } /* read in data from the new dta */ printf("The first 128 characters are:\n"); for (i=0; i<128; i++) putchar(buffer); /* restore previous dta */ setdta(save_dta); return 0; }