c 读文件

c 读文件

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define szBUF 30000



int main(int argc, char * argv[])
{
    char filename[szBUF]={0};
    char buf[szBUF]={0};
    char a[szBUF];

    char *need_find_start = "<RoomType>";
    int lens_start = strlen(need_find_start);
    char *need_find_end = "</RoomType>";
    int lens_end = strlen(need_find_end);


    char *head  = NULL;
    char *end = NULL;

    //    int r = 0;
    //    int b=0;
    FILE * f = 0;
    if(argc < 2) {
        printf("please input the file name:");
        gets(filename);
    }
    else
        strcpy(filename, argv[1]);
    //end if
    f = fopen(filename, "r");
    if(!f) {
        printf("file %s open fault!\n", filename);
        return 0;
    }//end if



    while(fgets(buf,30000,f) != NULL)
    {
        head = strstr(buf, need_find_start);
        if(head != NULL)
        {
            end = strstr(buf, need_find_end);
            if(end != NULL)
            {
                long long int lens = (long long int)(end) - (long long int)(head) - lens_start;
                char *strings = (char*)malloc(lens + 1);
                strncpy(strings, head + lens_start, lens);
                printf("123\n");
                printf("%s\n\n", strings);
            }
            else
            {
                while(fgets(buf,30000,f) != NULL)
                {
                    end = strstr(buf, need_find_end);
                    if(end != NULL)
                    {
                        long long int lens = (long long int)(end) - (long long int)(head) - lens_start;
                        char *strings = (char*)malloc(lens + 1);
                        strncpy(strings, head + lens_start, lens);
                        printf("123\n");
                        printf("%s\n\n", strings);
                    }
                }
            }
        }

        /*
           head = strstr(buf, "<RoomType>");
           int room_lens = strlen("<RoomType>");
           if(head != NULL)
           {
           end = strstr(head, "</RoomType>" );
           if(end != NULL)
           {
           long long int lens = (long long int)(end) - (long long int)(head) - room_lens;
           strings = (char*)malloc(lens + 1);
           strncpy(strings, head + room_lens, lens);
           }
           }
           */
    }

    fclose(f);
    return 0;
}

　　

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