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DarkBASIC Professional Discussion / Using Memblocks and pointers

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ProfessorKill
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Joined: 3rd Nov 2003
Location: Frederick, MD
Posted: 29th Nov 2003 22:00
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I'm having a bit of trouble using memblocks. Here's what I'm trying to do and getting various errors...

1. Create a small memblock of 128 bytes
2. Create pointer to the memblock
3. Write a string into the block
4. Use a pointer to pass the memblock into a dll
5. Read a value in a memblock and print it out.

Very simple I'm sure, but I really can't find any tutorials on using memblocks. The search feature for this forum is horrible. The help files in DBP are even more horrible.

Can someone post a quick snippet which will do the above?

Thanks in advance for your help. I really need it
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ProfessorKill
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Posted: 29th Nov 2003 23:02 Edited at: 29th Nov 2003 23:07
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Ok, this seems to work...

    make memblock 1, 8
    mName = get memblock ptr(1)
    *mName = "ProfKill"

The value "ProfKill" is written to the memblock. Now how can I "Print" what is in a memblock?

Is this bad code? Meaning is there an easier way to do this?

Thanks again
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the_winch
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Location: Oxford, UK
Posted: 29th Nov 2003 23:05
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dbpro : p166mmx @ 233 : 256mb : sb 128pci : sis onboard
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ProfessorKill
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Posted: 29th Nov 2003 23:09
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Ok, so I'm -not- using the pointer (*) correctly?

Thanks for your reply
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IanM
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Posted: 30th Nov 2003 12:15
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Grab the utility DLL from my site - it has peek and poke for all types including strings
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ProfessorKill
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Posted: 1st Dec 2003 03:44
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@IanM

The GET STRING PTR function is nice. Working well for me. I haven't tried yet but can I do this...

Buffer$ = space$(32)
call dll 1, "BlahBlahFunction", GET STRING PTR(Buffer$)

Will the dll be able to write a value into Buffer$? And then I could just print Buffer$?

Mark
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IanM
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Posted: 1st Dec 2003 03:58 Edited at: 1st Dec 2003 03:59
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Yep. I do that myself sometimes



You just have to be careful to remember that strings are null-terminated and are 1 character longer than the length reported.
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ProfessorKill
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Posted: 1st Dec 2003 04:06
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So I don't have to use GET STRING PTR?

Passing a string variable name into a dll passes in a pointer, not the string?
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IanM
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Posted: 1st Dec 2003 13:10
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When you pass a string to an external DLL in this way it passes the pointer to the string already, although using the GET STRING PTR() would work too.
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ProfessorKill
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Posted: 2nd Dec 2003 14:23
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IanM

Did you get my email? I can't get to my email from work so I haven't had a chance to see if you replied.

Assuming you did get the email...

What are your thoughts? Does a dll or plug-in like that already exist? Assuming no, would that be an easy dll/plug-in to write? Is that something you might do for a fee?

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IanM
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Posted: 2nd Dec 2003 14:34
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I have got your mail ... I just hadn't decided on how to reply to it yet

I'll reply now
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