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DarkBASIC Discussion / Copy memory into memblock?

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TheComet
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Posted: 25th Dec 2011 17:30
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This is for the vertex challenge in DBC. I have a pointer telling me where the memory is located, and I want to somehow copy that memory into a memblock. Da codez:



Now I have to copy the 256 bytes that are at the pointer ffthandle(0) into memblock 1 which is at pointer spectrum(0) to get my FFT data. Is this possible?

TheComet


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Latch
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Posted: 26th Dec 2011 01:55 Edited at: 1st Jan 2012 23:37
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Hi, TheComet,

It's possible, but you'll need help from a DLL function call. If the DLL you are using doesn't have a copy memory function built in, one can be made in a separate DLL. I went ahead and knocked together a copy memory call in a dll. It's just bare bones - it does very little checking - it will only check if the pointers are NULL.

It's the USERS responsibility to know that the target and source memory the pointers point to is allocated to the correct size and you aren't trying to copy more bytes than are available or receivable. The dll is attached.

The call is as follows



If successful, then resultptr should be equal to targetptr otherwise -1 is returned.

For your code it might look like:



Enjoy your day.

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Benjamin
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Posted: 2nd Jan 2012 20:37
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One of the system libraries (kernel32 to be exact) provides a function that can be used to copy memory:



It's the closest you'll find for a function that does a simple memory copy, since the most basic routines are implemented inline rather than in a library.



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Latch
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Posted: 3rd Jan 2012 01:41 Edited at: 3rd Jan 2012 01:57
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I thought the RtlMoveMemory function only moves 4 byte blocks at a time, but it seems to work with any length. Nice.

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Benjamin
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Posted: 3rd Jan 2012 02:05
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Quote: "I think the RtlMoveMemory function only moves 4 byte blocks at a time."


Not as far as I know.



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