42 lines
852 B
C
42 lines
852 B
C
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// 自定义二进制文件读取
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#include <stdio.h>
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#include <stdlib.h>
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typedef struct
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{
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int sid;
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char name[32];
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int age;
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char sex[4];
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} STU;
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int main()
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{
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FILE *f = fopen("d13.txt", "rb");
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if (NULL == f)
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{
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return 1;
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}
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// 让光标移动到文件尾部
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fseek(f, 0, SEEK_END);
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long file_size = ftell(f); // 获取文件大小
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printf("文件大小: %ld B\n", file_size);
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int stu_num = file_size / sizeof(STU);
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printf("学生数目: %d 位\n", stu_num);
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fseek(f, 0, SEEK_SET); // 重置光标位置到头
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for (int i = 0; i < stu_num; i++)
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{
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STU *s = calloc(1, sizeof(STU));
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int fx = fread(s, sizeof(STU), 1, f);
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if (fx != 0)
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printf("%d %s %d %s\n", s->sid, s->name, s->age, s->sex);
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free(s);
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}
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fclose(f);
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return 0;
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}
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