|
Turbo C 2.0、Borland C++库函数及用例(27) return 0;
}
函数名: fgetchar
功 能: 从流中读取字符
用 法: int fgetchar(void);
程序例:#include <stdio.h>int main(void)
{
char ch;
/* prompt the user for input */
printf("Enter a character followed by \
<Enter>: ");
/* read the character from stdin */ ch = fgetchar();
/* display what was read */
printf("The character read is: '%c'\n",
ch);
return 0;
}
函数名: fgetpos
功 能: 取得当前文件的句柄
用 法: int fgetpos(FILE *stream);
程序例:#include <string.h>
#include <stdio.h>int main(void)
{
FILE *stream;
char string[] = "This is a test";
fpos_t filepos;
/* open a file for update */
stream = fopen("DUMMY.FIL", "w+"); /* write a string into the file */
fwrite(string, strlen(string), 1, stream); /* report the file pointer position */
fgetpos(stream, &filepos);
printf("The file pointer is at byte\
%ld\n", filepos); fclose(stream);
return 0;
}
函数名: fgets
功 能: 从流中读取一字符串
用 法: char *fgets(char *string, int n, FILE *stream);
程序例:#include <string.h>
#include <stdio.h>int main(void)
{
FILE *stream;
char string[] = "This is a test";
char msg[20];
/* open a file for update */ stream = fopen("DUMMY.FIL", "w+");
/* write a string into the file */
fwrite(string, strlen(string), 1, stream);
/* seek to the start of the file */
fseek(stream, 0, SEEK_SET);
/* read a string from the file */
fgets(msg, strlen(string)+1, stream); /* display the string */
printf("%s", msg); fclose(stream);
return 0;
}
函数名: filelength
功 能: 取文件长度字节数
用 法: long filelength(int handle);
程序例:#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <io.h>int main(void)
{
int handle;
char buf[11] = "0123456789"; /* create a file containing 10 bytes */
handle = open("DUMMY.FIL", O_CREAT);
write(handle, buf, strlen(buf)); /* display the size of the file */
printf("file length in bytes: %ld\n",
filelength(handle)); /* close the file */
|
