wcstombs_s 宽字节转多字节

// crt_wcstombs_s.c  
// This example converts a wide character  
// string to a multibyte character string.  
#include <stdio.h>  
#include <stdlib.h>  
#include <assert.h>  
  
#define BUFFER_SIZE 100  
  
int main( void )  
{  
    size_t   i;  
    char      *pMBBuffer = (char *)malloc( BUFFER_SIZE );  
    wchar_t*pWCBuffer = L"Hello, world.";  
  
    printf( "Convert wide-character string:
" );  
  
    // Conversion  
    wcstombs_s(&i, pMBBuffer, (size_t)BUFFER_SIZE,   
               pWCBuffer, (size_t)BUFFER_SIZE );  
  
    // Output  
    printf("   Characters converted: %u
", i);  
    printf("    Multibyte character: %s

",  
     pMBBuffer );  
  
    // Free multibyte character buffer  
    if (pMBBuffer)  
    {  
    free(pMBBuffer);  
    }  
} 

　　

From: https://blog.csdn.net/ychw365/article/details/7034950