Sizeof question...

[CT]

How do I get the size of the data a pointer is referencing?

Ex:

LPBYTE pRawData = NULL;

pRawData = SomeFuncThatReturnsPtrToData();

//Now how to I get the size of the DATA pRawData is pointing to?

[R W Collymore]

"CT" <CT@yahoo.com> wrote:
>
>How do I get the size of the data a pointer is referencing?
>
>Ex:
>
>LPBYTE pRawData = NULL;
>
>pRawData = SomeFuncThatReturnsPtrToData();
>
>//Now how to I get the size of the DATA pRawData is pointing to?
>

Hi CT
Try

int sizeofdata=sizeof(*pRawData);

Try and reply:-)

[Wayne Mack]

If pRawData is a NULL terminated text string,
you can use strlen() to get the length. If
it is binary data, you will have to use some
other method, i.e. a priori knowledge or some
custom parsing routine.

NOTE: sizeof() will not work. It will return
the length of a pointer, probably 4 bytes.

Wayne

"CT" <CT@yahoo.com> wrote:
>
>How do I get the size of the data a pointer is referencing?
>
>Ex:
>
>LPBYTE pRawData = NULL;
>
>pRawData = SomeFuncThatReturnsPtrToData();
>
>//Now how to I get the size of the DATA pRawData is pointing to?
>

[James Curran]

"R W Collymore" <software1@technologist.com> wrote in message
news:38e08ecf$1@news.devx.com...
> >LPBYTE pRawData = NULL;
> >
> >pRawData = SomeFuncThatReturnsPtrToData();

> int sizeofdata=sizeof(*pRawData);

That is almost certainly not going to respond with the value he is
looking for. Assuming that LPBYTE is a "long pointer to a BYTE", then
"sizeof(*pRawData)" would be exactly the same as "sizeof(BTYE)". sizeof is
*always* resolved at compile-time, so it can never take into consideration a
run-time value.


--
Truth,
James Curran
http://www.NJTheater.com
http://www.NJTheater.com/JamesCurran