Read data from end of installer, append it to installed file
Hello everyone,
In order to pass some parameters from a website to an exe file, I dynamically append 68 bytes of data to it whenever a user downloads it.
Now I'd like to have an installer for this application, but with a setup file I obviously can't append this data directly to the executable. From asking on IRC, I know that it won't break the installer when data is appended to it. So what I tried to do is append the data to the installer and then write it to the installed exe file during installation. I tried to adapt the ReadCustomerData script from the wiki, but my script fails to do the job.
This is the relevant part of my script, I added some error checking to find out what's going wrong:
# Backup variables
Push $1 # sbar.exe file handle
Push $2 # installer file handle
Push $3 # current byte
Push $4 # read count
Push $5 # write count
IntOp $4 $4 & 0
IntOp$5 $5 & 0
ClearErrors
# Open sbar.exe to write (seek to file end)
FileOpen $1 "$INSTDIR\sbar.exe" a
FileSeek$1 0 END
DetailPrint$1
# Open installer to read
FileOpen $2 "$EXEPATH" r
FileSeek$2 -68 END
DetailPrint$2
IfErrors error
loop:
# Read and write one byte
FileReadByte $1 $3
DetailPrint$3
IfErrors done
IntOp$4 $4 + 1
FileWriteByte$2 $3
IfErrors error
IntOp$5 $5 + 1
Goto loop
error:
MessageBox MB_OK "There was an error processing the file (read=$4, write=$5)."
Abort
done:
MessageBox MB_OK "Read $4, wrote $5 bytes."
# Close files
FileClose $1
FileClose$2
# Restore variables
Pop $4
Pop$3
Pop$2
Pop$1
>
When I run the installer on my Win7 x64 as admin, a message box pops up, saying that zero bytes have been read and written (i.E. 'done' label). If I interpret that correctly the files could both be opened but the reading operation fails.This is my first script (and nsis installer), please tell me if there's some stupid mistake.
Thanks in advance.