函数名: setdta

功 能: 设置磁盘传输区地址

用 法: void setdta(char far *dta);

程序例:

#include <process.h>

#include <string.h>

#include <stdio.h>

#include <dos.h>

int main(void)

{

char line[80], far *save_dta;

char buffer[256] = "SETDTA test!";

struct fcb blk;

int result;

/* get new file name from user */

printf("Enter a file name to create:");

gets(line);

/* parse the new file name to the dta */

parsfnm(line, &blk, 1);

printf("%d %s\", blk.fcb_drive, blk.fcb_name);

/* request DOS services to create file */

if (bdosptr(0x16, &blk, 0) == -1)

{

perror("Error creating file");

exit(1);

}

/* save old dta and set new dta */

save_dta = getdta();

setdta(buffer);

/* write new records */

blk.fcb_recsize = 256;

blk.fcb_random = 0L;

result = randbwr(&blk, 1);

printf("result = %d\", result);

if (!result)

printf("Write OK\");

else

{

perror("Disk error");

exit(1);

}

/* request DOS services to close the file */

if (bdosptr(0x10, &blk, 0) == -1)

{

perror("Error closing file");

exit(1);

}

/* reset the old dta */

setdta(save_dta);

return 0;

}