// crt_wcstombs_s.c  // This example converts a wide character  // string to a multibyte character string.  #include 
     
        #include 
      
         #include 
       
            #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:\n" );        // Conversion      wcstombs_s(&i, pMBBuffer, (size_t)BUFFER_SIZE,                  pWCBuffer, (size_t)BUFFER_SIZE );        // Output      printf("   Characters converted: %u\n", i);      printf("    Multibyte character: %s\n\n",       pMBBuffer );        // Free multibyte character buffer      if (pMBBuffer)      {      free(pMBBuffer);      }  }
       
      
     

　　

 

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