[C] Xem tap tin DBF

[nqphuc]

#include <stdio.h>
typedef struct tagDBF_HEADER {
unsigned char signature; /* 03 = dbf, 83 dbf+dbt */
unsigned char ymd[3];
long num_records;
int data_off;
int rec_size;
unsigned char pad[20];
} DBF_HEADER;

typedef struct tagDBF_STRUCT {
char name[11];
char type;
long fstart;
unsigned char fsize;
unsigned char decimal;
char pad[14];
} DBF_STRUCT;

DBF_HEADER dbheader;
DBF_STRUCT dbstruct[255];
int numfields;

void main()
{
char filename[50];
char *dump, chuoi[250] ;
int i, j, offset, k;
FILE *fp;

printf("\nCho biet ten tap tin DBF muon xem : ");
gets(filename);
if ((fp=fopen(filename, "rb")) == NULL)
printf("Khong the mo tap tin %s", filename);
else
{
fread(&dbheader, sizeof(DBF_HEADER), 1, fp);
if (dbheader.signature == 3 || dbheader.signature == 0x83)
{
numfields = (dbheader.data_off - 33) / 32;
fread(&dbstruct, sizeof(DBF_STRUCT), numfields, fp);
fgetc(fp);
dump = (char *)malloc(dbheader.rec_size);
k = 7;
for (j=0; j<numfields; j++)
{
gotoxy(k, wherey());
textcolor(j+1);
cprintf("%s", dbstruct[j].name);
k += dbstruct[j].fsize;
}
for (i=0; i<dbheader.num_records; i++)
{
fread(dump, dbheader.rec_size, 1, fp);
printf("\n%3d ", i+1);
if (dump[0] != 32)
printf("* ");
else
printf(" ");
offset= 1;
for (j=0; j<numfields; j++)
{
switch(dbstruct[j].type)
{
case 'C' : strncpy(chuoi, &dump[offset], dbstruct[j].fsize);
chuoi[dbstruct[j].fsize] = 0;
printf("%s ", chuoi);
break;
case 'D' : printf("%c%c/%c%c/%c%c%c%c ",dump[offset+6], dump[offset+7],
dump[offset+4],dump[offset+5],dump[offset],dump[offset+1],
dump[offset+2],dump[offset+3]);
break;
case 'N' : for (k=0; k<dbstruct[j].fsize; k++)
printf("%c", dump[offset+k]);
printf(" ");
break;
case 'L' : printf("%c ", dump[offset]);
break;
}
offset += dbstruct[j].fsize;
}
}
free(dump);
}
else
printf("Khong phai tap tin DBF");
fclose(fp);
}
getch();
} 

[o0thangnd0o]

hay quá
cho mình hỏi bạn có sách nào nói về cấu trúc file PDF ko

[bao_tu_dau]

gotoxy(k, wherey());
textcolor(j+1); 

Bạn ơi!Sao mình làm như bạn thì nó báo lỗi ở các dòng trên.Mình có cần include thêm thư viện nào không?