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Turbo C 2.0、Borland C++库函数及用例(34) #include <stdio.h>void showpos(FILE *stream);int main(void)
{
FILE *stream;
fpos_t filepos; /* open a file for update */
stream = fopen("DUMMY.FIL", "w+"); /* save the file pointer position */
fgetpos(stream, &filepos); /* write some data to the file */
fprintf(stream, "This is a test"); /* show the current file position */
showpos(stream); /* set a new file position, display it */
if (fsetpos(stream, &filepos) == 0) showpos(stream);
else
{
fprintf(stderr, "Error setting file \
pointer.\n");
exit(1);
} /* close the file */
fclose(stream);
return 0;
}void showpos(FILE *stream)
{
fpos_t pos; /* display the current file pointer
position of a stream */
fgetpos(stream, &pos);
printf("File position: %ld\n", pos);
}
函数名: fstat
功 能: 获取打开文件信息
用 法: int fstat(char *handle, struct stat *buff);
程序例:#include <sys\stat.h>
#include <stdio.h>
#include <time.h>int main(void)
{
struct stat statbuf;
FILE *stream; /* open a file for update */
if ((stream = fopen("DUMMY.FIL", "w+"))
== NULL)
{
fprintf(stderr, "Cannot open output \
file.\n");
return(1);
}
fprintf(stream, "This is a test");
fflush(stream); /* get information about the file */
fstat(fileno(stream), &statbuf);
fclose(stream); /* display the information returned */
if (statbuf.st_mode & S_IFCHR)
printf("Handle refers to a device.\n");
if (statbuf.st_mode & S_IFREG)
printf("Handle refers to an ordinary \
file.\n");
if (statbuf.st_mode & S_IREAD)
printf("User has read permission on \
file.\n");
if (statbuf.st_mode & S_IWRITE)
printf("User has write permission on \
file.\n"); printf("Drive letter of file: %c\n",
'A'+statbuf.st_dev);
printf("Size of file in bytes: %ld\n",
statbuf.st_size);
printf("Time file last opened: %s\n",
ctime(&statbuf.st_ctime));
return 0;
}
函数名: ftell
功 能: 返回当前文件指针
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