sprintf_s函数用法

sprintf_s是一个函数，其函数功能是将数据格式化输出到字符串。sprintf_s对于格式化string中的格式化的字符的有效性进行了检查，sprintf_s也携带着接收格式化字符串的缓冲区的大小。

sprintf_s将格式化字符串存到缓冲区，如果格式化字符串过大，则sprintf_s会返回一个空string和设置无效参数句柄为激活。

函数原型：

int sprintf_s(

char *buffer,

size_t sizeOfBuffer,

const char *format [,

argument] ...

);

sprintf_s()是sprintf()的安全版本，通过指定缓冲区长度来避免sprintf()存在的溢出风险

相关函数：

int sprintf( char *buffer, const char *format [, argument] … );

int vsprintf( char *buffer, const char *format, va_list argptr );

int _sprintf_s_l(

char *buffer,

size_t sizeOfBuffer,

const char *format,

locale_t locale [,

argument] ...

);

int swprintf_s(

wchar_t *buffer,

size_t sizeOfBuffer,

const wchar_t *format [,

argument]...

);

int _swprintf_s_l(

wchar_t *buffer,

size_t sizeOfBuffer,

const wchar_t *format,

locale_t locale [,

argument]…

);

template <size_t size>

int sprintf_s(

char (&buffer)[size],

const char *format [,

argument] ...

); // C++ only

template <size_t size>

int swprintf_s(

wchar_t (&buffer)[size],

const wchar_t *format [,

argument]...

); // C++ only

// crt_sprintf_s.c

// This program uses sprintf_s to format various

// data and place them in the string named buffer.

//

#include <stdio.h>

int main( void )

{

char buffer[200], s[] = "computer", c = 'l';

int i = 35, j;

float fp = 1.7320534f;

// Format and print various data:

j = sprintf_s( buffer, 200, " String: %s\n", s );

j += sprintf_s( buffer + j, 200 - j, " Character: %c\n", c );

j += sprintf_s( buffer + j, 200 - j, " Integer: %d\n", i );

j += sprintf_s( buffer + j, 200 - j, " Real: %f\n", fp );

printf_s( "Output:\n%s\ncharacter count = %d\n", buffer, j );

}

Output:

String: computer

Character: l

Integer: 35

Real: 1.732053

character count = 79

附：https://baike.baidu.com/item/sprintf_s/8673108?fr=aladdin