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How to poke into code segment?

Posted on 2006-11-15
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Last Modified: 2010-04-04
Hi, using Delphi 2006, I have a need to poke a few bytes into the code so I can set breakpoints, something like:

    var p: ^ byte;

    function Func( x: integer ): integer;
    begin
        Func := x * x ;
       end;


begin
    p := @Func;
    p^ := $CC;
end;


... but of course I'm not allowed to write to the code.  A good thing, except right now.

Any ideas?

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Question by:grg99
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5 Comments
 
LVL 4

Expert Comment

by:tobjectpascal
ID: 17953257
i thought you set break points from the IDE not the code?
0
 
LVL 22

Author Comment

by:grg99
ID: 17954932
Hi, I figure out how to do it.  You call VirtualProtect with READ_WRITE.

0
 
LVL 9

Expert Comment

by:alkisg
ID: 17957953
For a complete working example, look at the fastcode.sourceforge.net library.
It uses code patching to substitute delphi functions with faster ones.
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