Embedding some identifier to installer

union · 1st November 2011, 20:47

Hello!

First of all sorry for my poor English.

I need some identifier in the installer, which can be changed directly by editing the exe-file (as it will occur on the server).

I tried to add in installer text file containing a string of "XXXXXXXXXXX" pointing to his "SetCompress off". When I open the installer in the hex-editor, I find this line in it, but if I change it, the installer will not run.

Anybody can help me?

Thanks in advance

LoRd_MuldeR · 1st November 2011, 21:01

This didn't work, because generally modifications of the installer EXE occur due to download errors. And NSIS uses a CRC check to detect corrupted (modified) installers. You could work around this "problem" by disabling the CRC check, BUT THIS IS A VERY BAD IDEA. Instead you could try to append some additional data to the end of the EXE file, after it has been compiled by MakeNSIS. I would assume this additional data ("overlay") is not covered by the CRC check. You could then open the EXE file for reading via FileOpen and $EXEFILE. As the size of the EXE file is not known beforehand, you don't know the exact seek position where you'll find your data. Instead you will have to add some "magic number" in front of the data. Then you can scan through the file via FileReadByte until you have found the "magic number" (and thus the desired data). Maybe start the search at some offset in order to speed-up the process...

Afrow UK · 1st November 2011, 22:33

http://nsis.sourceforge.net/ReadCustomerData

Stu

union · 2nd November 2011, 04:13

Thank you for your answers guys!
I think my problem is solved. I will use the ReadCustomerData function.

1st November 2011, 20:47	#1
union Junior Member Join Date: Nov 2011 Posts: 2	Embedding some identifier to installer Hello! First of all sorry for my poor English. I need some identifier in the installer, which can be changed directly by editing the exe-file (as it will occur on the server). I tried to add in installer text file containing a string of "XXXXXXXXXXX" pointing to his "SetCompress off". When I open the installer in the hex-editor, I find this line in it, but if I change it, the installer will not run. Anybody can help me? Thanks in advance

1st November 2011, 21:01	#2
LoRd_MuldeR Major Dude Join Date: Sep 2005 Location: Somewhere over the Slaughterhouse Posts: 797	This didn't work, because generally modifications of the installer EXE occur due to download errors. And NSIS uses a CRC check to detect corrupted (modified) installers. You could work around this "problem" by disabling the CRC check, BUT THIS IS A VERY BAD IDEA. Instead you could try to append some additional data to the end of the EXE file, after it has been compiled by MakeNSIS. I would assume this additional data ("overlay") is not covered by the CRC check. You could then open the EXE file for reading via FileOpen and $EXEFILE. As the size of the EXE file is not known beforehand, you don't know the exact seek position where you'll find your data. Instead you will have to add some "magic number" in front of the data. Then you can scan through the file via FileReadByte until you have found the "magic number" (and thus the desired data). Maybe start the search at some offset in order to speed-up the process... My Plugins: StdUtils \| NSISList \| CPUFeatures \| ExecTimeout \| KillProc My source of inspiration: http://youtu.be/lCwY4_0W1YI

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1st November 2011, 22:33	#3
Afrow UK Moderator Join Date: Nov 2002 Location: Surrey, England Posts: 8,434	http://nsis.sourceforge.net/ReadCustomerData Stu

2nd November 2011, 04:13	#4
union Junior Member Join Date: Nov 2011 Posts: 2	Thank you for your answers guys! I think my problem is solved. I will use the ReadCustomerData function.