Re: Insert and Retrieve unsigned char sequences using C

vinicius_bra wrote:
> I'm developing a system in C and I have a unsigned char pointer that
> represents a struct and I like to store it in a bytea column in postgreSQL.

The pointer does not represent the struct.

> How can I do it?
> Example:
>
> str_t temp;
> unsigned char *ptr;
> ptr = (unsigned char *)&temp;
> store(ptr);
>
> I've already tried some examples, but I didnt have success.
> Could you help me?

You won't have any joy storing the raw pointer value, because when you restore
it it'll most likely be into a different memory map and the structure to which
it used to point will no longer be at the same address, if anywhere.

That's because a C pointer doesn't represent a struct, or anything else other
than an address.  It *points to* the struct.

You need to serialize the struct itself then allocate the pointer when you
deserialize the struct.

--
Lew

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