sscanf的安全版本sscanf_s的函數定義： int sscanf_s( const char *buffer, const char *format [, argument ] ... );

在msdn中有如下mark，一定要仔細看喲，特別注意紅色的部分，否則會出錯的，我就在這里折騰了大半天才明白的

The?sscanf_s?function reads data from?buffer?into the location given by each?argument. The arguments after the format string specify pointers to variables with a type that corresponds to a type specifier in?format. Unlike the less secure version?sscanf_s,?a buffer size parametersizeOfBuffer?is required when using the type field characters c, C, s, S and [.?This parameter must be supplied as?an additional parameter after each buffer which requires it.

也可以看下面這個例子的，注意紅色的部分

// crt_sscanf_s.c
// This program uses sscanf_s to read data items
// from a string named tokenstring, then displays them.

#include <stdio.h>

int main( void )
{
???char??tokenstring[] = "15 12 14...";
???char??s[81];
???char??c;
???int???i;
???float fp;

???// Input various data from tokenstring:
???// max 80 character string plus NULL terminator
???sscanf_s( tokenstring, "%s", s, sizeof(s) );
???sscanf_s( tokenstring, "%c", &c, sizeof(char) );
???sscanf_s( tokenstring, "%d", &i );
???sscanf_s( tokenstring, "%f", &fp );

???// Output the data read
???printf_s( "String????= %s\n", s );
???printf_s( "Character = %c\n", c );
???printf_s( "Integer:??= %d\n", i );
???printf_s( "Real:?????= %f\n", fp );
}

Output

String = 15 Character = 1 Integer: = 15 Real: = 15.000000 fscanf_s,fwscanf_s用法和sscanf_s差不多，只是把字符串換成了打開的流。 轉自?http://blog.sina.com.cn/s/blog_670e606a0100m1d1.html

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