how execute code residing in data segment??

This is a discussion on how execute code residing in data segment?? within the C++ Programming forums, part of the General Programming Boards category; I am facing a problem and need a solution.... I am working on windows 2000 platform and using the DEV-C++ ...

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    Question how execute code residing in data segment??

    I am facing a problem and need a solution....

    I am working on windows 2000 platform and using the DEV-C++ IDE. I have created a small executable file and copied that executable code in an char array which is declared as global in other program. I need to execute this array by using this new program. How to do it??

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    and the hat of wrongness Salem's Avatar
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    Explore alternative solutions to the problem perhaps?

    In other words, describe the problem, not how to make your current solution work.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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    Kiss the monkey. CodeMonkey's Avatar
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    Your program cannot call executable code. It is not an operating system. However, you can request that the system should.

    If you have an executable you want called remotely, see the FAQ.
    "If you tell the truth, you don't have to remember anything"
    -Mark Twain

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    CSharpener vart's Avatar
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    Save it to temp File
    Call CreateProcess or something on it
    After it is finished - delete the file
    The first 90% of a project takes 90% of the time,
    the last 10% takes the other 90% of the time.

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    Super Moderator VirtualAce's Avatar
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    I'm not sure why you would need to do this. Please expand.

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    Thumbs down

    I need to do this because I am asked to do it that way.... I dont want to store the executable in a file and then execute it using
    1.system() function..
    2.using fork sys call.
    3.using spawn..

    I want to execute the executable code after storing it in array..( when it is stored in array it resides in data segment, and data segment does not have an executable permission..) Is there any way to execute a code in data segment in windows using C++..

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    Kiss the monkey. CodeMonkey's Avatar
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    What is the point of emulating the caller?
    I need to do this because I am asked to do it that way
    Then it looks like you'll be doing some fairly low-level, entirely platform-specific coding. Not to mention potentially malicious.
    As for how this might be achieved in Windows, I do not know. Google showed me no love.
    "If you tell the truth, you don't have to remember anything"
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    Lightbulb Hi.....

    I tried it using Function Pointers ... But it gave an Segment violation Fault as expected because data segment doesn't havean executable permission.... c
    Can I some how make a part of data segment executable???????

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    and the hat of wrongness Salem's Avatar
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    You can't just take the hex dump of one executable and stuff it inside the data segment of another exectuable, and then expect to be able to run it.

    .exe files are not simple images of what the program looks like in memory, they have lots of internal structure which gets resolved by the program loader (part of the OS) when the program is run.

    If you've got the source code for both, then simply include the source code of the smaller project into the larger project (or make the common components a library). The result is much easier to do, and the result is far more predictable.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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    Algorithm Dissector iMalc's Avatar
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    Due to the nature of the question I'm not going to tell you where you can get this information until you explain what this is for.
    My homepage
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    Quote Originally Posted by ravindragjoshi View Post
    I tried it using Function Pointers ... But it gave an Segment violation Fault as expected because data segment doesn't havean executable permission.... c
    Can I some how make a part of data segment executable???????
    http://msdn2.microsoft.com/en-us/library/aa366899.aspx

    I'll let you figure out how to use this lovely function yourself (and my code using it is gone anyway), good luck
    Last edited by The Wazaa; 06-13-2007 at 10:07 AM.

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    Thank you for your help...... I 'll try it out.....

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