C/stdio.h/fseek — различия между версиями
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Версия 17:20, 25 мая 2010
fseek: moves the file position pointer
<source lang="cpp">
//Header file: #include <stdio.h> //Declaration: int fseek(FILE *stream, long int offset, int origin); //Return: zero on success or nonzero on failure. //"origin" must be one of:
//Name Meaning //SEEK_SET: Seek from start of file //SEEK_CUR: Seek from current location //SEEK_END: Seek from end of file
#include <stdio.h> #include <stdlib.h> struct fullname { char firstName[40]; char lastName[10]; } info; int main(void){ FILE *fp; if((fp=fopen("test", "rb")) == NULL) { printf("Cannot open file.\n"); exit(1); } int client_num = 10; /* find the proper structure */ fseek(fp, client_num*sizeof(struct fullname), SEEK_SET); /* read the data into memory */ fread(&info, sizeof(struct fullname), 1, fp); fclose(fp); }
</source>