_mbsnbcnt() problems

hi,everyone

I want to use the _mbsnbcnt() to get the bytes number of a string

my code is as follows:

define CHAR_PER_LINE 30
char *pBuf=new char[100];
memset(pBuf,32,100);

int my function:i first read in string from the txt file,and then use
the following line:

int nLen=_mbsnbcnt( (unsigned char*)pBuf,CHAR_PER_LINE);

when i check the value of the nlen , i found that some times it larger than the CHAR_PER_LINE,why?

Looks like you miss the terminating zero at your string´s end. Maybe this helps:

Code:

---

#define CHARS_PER_LINE 30
#define BUFFER_SIZE 100

char *pBuf = new char[BUFFER_SIZE];
if( pBuf ) {
  memset( pBuf, 0, BUFFER_SIZE );
  // read max. BUFFER_SIZE -1 characters into your buffer

  int nLen=_mbsnbcnt( (unsigned char*)pBuf,CHAR_PER_LINE);
}

---

Second, maybe the lines you read from your file are longer that 30 characters?

Good Luck,
Guido