函数名: vfscanf
功 能: 从流中执行格式化输入
用 法: int vfscanf(FILE *stream, char *format, va_list param);
程序例:
#include
#include
#include
FILE *fp;
int vfsf(char *fmt, ...)
{
va_list argptr;
int cnt;
va_start(argptr, fmt);
cnt = vfscanf(fp, fmt, argptr);
va_end(argptr);
return(cnt);
}
int main(void)
{
int inumber = 30;
float fnumber = 90.0;
char string[4] = "abc";
fp = tmpfile();
if (fp == NULL)
{
perror("tmpfile() call");
exit(1);
}
fprintf(fp,"%d %f %s
",inumber,fnumber,string);
rewind(fp);
vfsf("%d %f %s",&inumber,&fnumber,string);
printf("%d %f %s
",inumber,fnumber,string);
fclose(fp);
return 0;
}