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DLL Talk / Question for TCA

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Mnemonix
16
Years of Service
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Joined: 2nd Dec 2002
Location: Skaro
Posted: 20th Oct 2004 08:07
Hi,

I have been using some of your great plugins, for different tasks in my program. I notice how many of the functions contained in them take a ptr to memory made with the MAKE MEMORY command. Is it complex to modify this data within the dll and return the pointer?, also what is the argument type in c++ for the pointer.

Thanks, Mnemonix.

Oh yea, i tried looking at your source code on your website, but it was quite complex.

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OSX Using Happy Dude
15
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Joined: 21st Aug 2003
Location: At home
Posted: 20th Oct 2004 08:12
Which ones are you enquiring about ? Usually modifying data passed is easy (the mySQL is slightly harder, but thats only due mySQL stuff).

For C++ your supposed to use new to allocate memory (as it can correctly allocate memory for classes), although I still tend to use malloc/calloc.

The pointer type stays the same, so its :

*ptr=new char[1024];

and

*ptr=(char *) calloc(1024);

are for all purposes more or less the same.


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Mnemonix
16
Years of Service
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Joined: 2nd Dec 2002
Location: Skaro
Posted: 20th Oct 2004 08:14
I mean in DBP, when you use

ptr=MAKE MEMORY(1024)
myTPC(ptr)

Now, how can i get hold of the data stored at the ptr in c++, and is it possible to modify it?

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OSX Using Happy Dude
15
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Joined: 21st Aug 2003
Location: At home
Posted: 20th Oct 2004 17:11
Well, in the C function it would be passed into a DWORD, thus :

myTPC(DWORD addr)

Depending on the type, it could be converted to a string or some other pointer :

str=(LPSTR) addr;

and then modified as usual using :

*(str)=(char) 'A';

If it requires some other type its just as easy :

ptr=(MYSQL *) addr;
ptr->wibble=27;

If you want to keep it as a list of array pointers :

ptr=(DWORD *) addr;
*(ptr)=12;

The important thing is the use of pointers to modify the data. It doesn't have to be complex but its certainly needed.*


*Not always - you can use the code for the peek/poke commands, but that usually makes it more complex.


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Mnemonix
16
Years of Service
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Joined: 2nd Dec 2002
Location: Skaro
Posted: 21st Oct 2004 02:19
Thank you!. This should be all I need .

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OSX Using Happy Dude
15
Years of Service
User Offline
Joined: 21st Aug 2003
Location: At home
Posted: 21st Oct 2004 17:04



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