finding a program in memory

This is a discussion on finding a program in memory within the C++ Programming forums, part of the General Programming Boards category; there wasnt a good board to post this on, since its not quite C or C++, nor is it not ...

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    finding a program in memory

    there wasnt a good board to post this on, since its not quite C or C++, nor is it not programming related, but its a fairly simple question and i figure somebody here has got to know it...

    i just want to know how i can find where a program is in memory... be it with DEBUG or C++ or whatever. I just want to be able to know where a program is running so that i can access its memory. I have some knowlege of assembly but its limited.
    I came up with a cool phrase to put down here, but i forgot it...

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    carry on JaWiB's Avatar
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    I don't know really any assembly (never got around to learning lol) but it sounds like an OS dependent problem...
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    Super Moderator VirtualAce's Avatar
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    In order to find out where a program is in memory you will need its PSP or Program Segment Prefix. In DOS this was done by an INT21h function and C even had a function that would retrieve the PSP.

    Now in protected mode the PSP might be a bit different - I'm not sure. Since all PM addresses are accessed via descriptors it might be a chore to write code that finds the PSP or equiv in protected mode.

    DOS would also report to you what programs were in memory and where. I'm sure that Windows has a similar set of functions for this. Probably an enumeration function with a callback, similar to the enumeration of fonts on the system.

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    mustang benny bennyandthejets's Avatar
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    I don't think it's possible to just access a memory location in protected mode. You could however use ReadProcessMemory() and WriteProcessMemory() after finding the process ID. What specifically are you trying to achieve here?
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    quenching of curiosity, mainly.
    I came up with a cool phrase to put down here, but i forgot it...

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    mustang benny bennyandthejets's Avatar
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    Well, if you do think of something to do with this knowledge, post it, and we'll see what we can do.
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    well what i was thinking about at the time was helper programs for games. they seem to be everywhere and i want to know how to make them for myself.
    I came up with a cool phrase to put down here, but i forgot it...

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    mustang benny bennyandthejets's Avatar
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    I'm guessing that's possible with ReadProcessMemory() and WriteProcessMemory(), but I'd have no idea which memory addresses to look at.
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