How do I allow my exe to modify it's own resource?

I basically want to be able to modify a resource in my executable as a way of copy-protecting my programs. When the program first runs, I want it to modify a resource, giving it the serial number of the user's C: drive.

Is this possible? I know how to retrieve serial number - I only want to know how to modify "self".

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jhattinghAsked:
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DanRollinsConnect With a Mentor Commented:
Easier than migel's suggestion...
Write say, four bytes to the end of the EXE program:

1) at runtime, open the EXE file.  
2) Seek to the end less 4 bytes.
3) Read the next 4 bytes.
4a) If the first two are some special codes (e.g. "jH') then the signature-stamping has already been done.  So verify that the next two bytes match the signature of the executing computer.
4b) If the first two bytes are *NOT* 'jH', calculate the signature stamp and write 'jHxx' to the end of the file -- where xx is your signature stamp.

Note that this will trigger most virus protection software to complain.  One way around that is to rename the EXE to Myprog.Tmp before doing this, then name it back later.  If this is not possible from the EXE, then do it in an installation/setup program.  

Also, the best way *IS* to write to a resource -- but so many users continue to use Win98 that it is not possible to use that as a sole method -- unless you restrict users to Win2K

-- Dan
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jkrCommented:
>>I want it to modify a resource

This is possible using e.g. 'UpdateReposurce()' (http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/hh/winui/resource_2crp.asp) - see also http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/hh/winui/resource_05yr.asp ('Adding, Deleting, and Replacing Resources'). However, there are some restrictions:

  Windows NT/2000 or later: Requires Windows NT 3.1 or later.
  Windows 95/98/Me: Unsupported.
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migelCommented:
Hi!
Why resource ???
you can write serial id indirect into the EXE file just make sure where serial located in the exe and write nwe value to the founded offset
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