C语言 包含来自另一个目录的头文件
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Including a header file from another directory
提问by Manny
I have a main directory Awith two sub directories Band C.
我有一个A包含两个子目录的主目录B和C.
Directory Bcontains a header file structures.c:
目录B包含一个头文件structures.c：
#ifndef __STRUCTURES_H
#define __STRUCTURES_H
typedef struct __stud_ent__
{
char name[20];
int roll_num;
}stud;
#endif
Directory Ccontains main.ccode:
目录C包含main.c代码：
#include<stdio.h>
#include<stdlib.h>
#include <structures.h>
int main()
{
stud *value;
value = malloc(sizeof(stud));
free (value);
printf("working \n");
return 0;
}
But I get an error:
但我收到一个错误：
main.c:3:24: error: structures.h: No such file or directory
main.c: In function ‘main':
main.c:6: error: ‘stud' undeclared (first use in this function)
main.c:6: error: (Each undeclared identifier is reported only once
main.c:6: error: for each function it appears in.)
main.c:6: error: ‘value' undeclared (first use in this function)
What is the correct way to include the structures.hfile into main.c?
将structures.h文件包含到main.c.
回答by Constantinius
When referencing to header files relativeto your c file you should use #include "path/to/header.h"
当引用相对于您的 c 文件的头文件时，您应该使用#include "path/to/header.h"
The form #include <someheader.h>is only used for internal headers or for explicitly added directories (in gcc with the -Ioption).
该表单#include <someheader.h>仅用于内部标题或显式添加的目录（在带有-I选项的gcc 中）。
回答by Jeegar Patel
write
写
#include "../b/structure.h"
in place of
代替
#include <structures.h>
then go in directory in c & compile your main.c with
然后进入 c 中的目录 & 编译你的 main.c
gcc main.c
回答by Timandi Vlad
If you work on a Makefile project or simply run your code from command line, use
如果您处理 Makefile 项目或只是从命令行运行代码，请使用
gcc -IC main.c
gcc -IC main.c
where -Ioption adds your Cdirectory to the list of directories to be searched for header files, so you'll be able to use #include "structures.h"anywhere in your project.
where-I选项将您的C目录添加到要搜索头文件的目录列表中，这样您就可以#include "structures.h"在项目的任何地方使用。
回答by Vishwajeet Vishu
If you want to use the command line argument then you can give gcc -idirafter ../b/ main.c
如果你想使用命令行参数，那么你可以给 gcc -idirafter ../b/ main.c
then you don't have to do any thing inside your program.
那么你不必在你的程序中做任何事情。
