我正在测试二进制文件I/O。所以,练习我做了一个小程序:fwrite打印垃圾,fread读取垃圾结构
的main.c:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "person.h"
int main()
{
struct person me;
struct person cpy_me;
FILE *dataWrite, *dataRead;
strcpy(me.fname, "john");
strcpy(me.lname, "smith");
me.age = 12;
printf("%s %s %d\n", me.fname, me.lname, me.age);
dataWrite = fopen("people.bin", "wb");
if (fwrite(&me, sizeof(struct person), 1, dataWrite) != 1)
fprintf(stderr, "Error!\n");
printf("Wrote to the file\n");
dataRead = fopen("people.bin", "rb");
fread(&cpy_me, sizeof(struct person), 1, dataRead);
printf("%s->Fname\n", cpy_me.fname);
printf("%s->Lname\n", cpy_me.lname);
printf("%d->Age\n", cpy_me.age);
fclose(dataWrite);
fclose(dataRead);
return 0;
}
person.h:
#ifndef PERSON_H_INCLUDED
#define PERSON_H_INCLUDED
#define MAXFIRST 10
#define MAXLAST 20
struct person
{
char lname[MAXLAST], fname[MAXFIRST];
int age;
};
#endif // PERSON_H_INCLUDED
这是出现在文件中people.bin
:
smith ÿÿb¸tÄ[½tà@ john @ à@
当我阅读显示fread
的结果时,我得到:
我知道在二进制文件中,它不会以人类可读的形式显示它,但它应该看起来像这样吗?我不这么认为,因为年龄甚至不可见,fread
显示它读取垃圾。
'FCLOSE(数据);数据=的fopen( “people.bin”, “RB”); FREAD(cpy_me,...' – BLUEPIXY 2014-12-10 23:12:42
现在我得到这样的:'史密斯ÿÿb¸tÄ[½tà@约翰@à@ ' – stackptr 2014-12-10 23:16:46
对我很好用 – BLUEPIXY 2014-12-10 23:19:30