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DLL Talk / memory problems (driving me crazy)

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Tommy S
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Posted: 4th Jun 2005 01:13
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this code is meant to read a memory address from a file and make a pointer to it so that i can use call dll and return data from c++. Thats the plane anyway and my c++ is pretty shocking, if anyone can help it would be greatly appreciated.
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OSX Using Happy Dude
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Posted: 4th Jun 2005 01:23
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Why not allocate memory in one part and pass it to another ? Storing it in a file is just asking for trouble.

So it would be something like :

ptr=make memory(1024)
call dll 1,"flibble",ptr,17

And in the DLL you would have

void flibble(DWORD ptr,int value)
{
*(DWORD) ptr=(DWORD) value;
}


Atomz is at http://homepages.nildram.co.uk/~nickk
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Tommy S
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Posted: 4th Jun 2005 01:34
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the problem is i will be allocating the memory in a dll already attached to one program and trying to acess it from another dll attached to dbpro. That was the reason for the file in the middle. If there's a way to get rid of it then that'd be great
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IanM
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Posted: 4th Jun 2005 03:04
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Stop! You cannot do this.

Memory addresses are private to the process that has allocated the memory. You cannot share like this.

You have two options:

- Use memory mapping to share the file contents (you access it using memory addresses, not file I/O)

- Use memory mapping to share a portion of the swap space.

If you don't need to keep the data permanently, then the second option is the one to go for.

http://docs.rinet.ru/VidimyyC/vcu13fi.htm#I24

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Tommy S
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Posted: 4th Jun 2005 19:16
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sorry to be a pain in the arse but that went straight over my head. Could you show me some code?
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IanM
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Posted: 4th Jun 2005 19:36
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Yes ... http://docs.rinet.ru/VidimyyC/vcu13fi.htm#I24

Sorry, but the # stops me making it a proper link.

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Three Score
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Posted: 5th Jun 2005 15:38
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filemapping is nice and easy to use

formerly shadows of emptiness
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