函数名

函数作用

头文件

函数原型

举例

函数名

strerror, _strerror, _wcserror, __wcserror

函数作用

Get a system error message (strerror, _wcserror) or prints a user-supplied error message (_strerror, __wcserror).

获取系统错误信息或打印用户程序错误信息。

头文件

#include <string.h>

函数原型

char *strerror(

int errnum

);

char *_strerror(

const char *strErrMsg

);

wchar_t * _wcserror(

int errnum

);

wchar_t * __wcserror(

const wchar_t *strErrMsg

);

参数：

errnum

Error number.

strErrMsg

User-supplied message.

返回：

指向错误信息的指针。

举例

// crt_perror.c

// compile with: /W1

/* This program attempts to open a file named

* NOSUCHF.ILE. Because this file probably doesn't exist,

* an error message is displayed. The same message is

* created using perror, strerror, and _strerror.

*/

#include <fcntl.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <io.h>

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

#include <share.h>

int main( void )

{

int fh;

if( _sopen_s( &fh, "NOSUCHF.ILE", _O_RDONLY, _SH_DENYNO, 0 ) != 0 )

{

/* Three ways to create error message: */

perror( "perror says open failed" );

printf( "strerror says open failed: %s\",

strerror( errno ) ); // C4996

printf( _strerror( "_strerror says open failed" ) ); // C4996

// Note: strerror and _strerror are deprecated; consider

// using strerror_s and _strerror_s instead.

}

else

{

printf( "open succeeded on input file\" );

_close( fh );

}

}

输出：

perror says open failed: No such file or directory

strerror says open failed: No such file or directory

_strerror says open failed: No such file or directory