Keil error: #101: “name“ has already been declared in the current scope解决方法 ---

keil编译时发生一连串#101 error问题

keil编译发生错误

#include <stdio.h>
#include <stdlib.h>
... // 标头档

#define Result_TIMOUT               3
#define Result_INTIAL               0
#define Result_ERROR                1

... // 预处理
typedef enum
{
    MD_INIT,
    HARDWARE_CHECK, 
    FILESYSTEM,     
    BS_SEARCH,      
    BS_REGISTER,    
    BS_REG_CHK,     
    ME_FC_INIT,
		ME_SOCKET,	
    ME_READY
}STATUS_MACHINE_INDEX;

... // struct, enum, union

extern md_Socket_CB 			SocketOpen_CB;
extern md_Socket_CB 			SocketClose_CB;

... // 外部变量等

解决方法

使用条件编译来防止头文件被重複包含，以上述程式码为例

#ifndef __MODEM_H__
#define __MODEM_H__

#include <stdio.h>
#include <stdlib.h>
... // 标头档

#define Result_TIMOUT               3
#define Result_INTIAL               0
#define Result_ERROR                1

... // 预处理
typedef enum
{
    MD_INIT,
    HARDWARE_CHECK, 
    FILESYSTEM,     
    BS_SEARCH,      
    BS_REGISTER,    
    BS_REG_CHK,     
    ME_FC_INIT,
		ME_SOCKET,	
    ME_READY
}STATUS_MACHINE_INDEX;

... // struct, enum, union

extern md_Socket_CB 			SocketOpen_CB;
extern md_Socket_CB 			SocketClose_CB;

... // 外部变量等

#endif

keil编译成功