strncpy_s

You are very familiar with strncpy_s(wszStringBuffer, BUFFER_SIZE, wszSourceBuffer, dwCopyBytes)

 

But if you declare wszStringBuffer[16], and call

 

strncpy_s( wszStringBuffer[5], ???, wszSourceBuffer, dwCopyBytes)

 

What value of the second parameter you should use?

 

Answer:

 

Finally, I use (BUFFER_SIZE - 5). I didn't investigate the detail.

 

 

 

Additional information,

 

you can use _countof() macro instead of BUFFER_SIZE as your 2nd parameter.

 

See MSDN: http://msdn.microsoft.com/en-us/library/ms175773.aspx

 

However, you can not use pointer in _countof() macro.

 

The following usages are illegal:

 

_countof ( pPointerToArray )

 

_countof ( wszStringBuffer[5] )

 

 

----

Frank