Reference/FileReadByte
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FileReadByte
handle user_var(output)
Reads a byte from a file opened with FileOpen. The byte is stored in the output as an integer (0-255). If the end of file is read and no more data is available, the output will be empty, and the error flag will be set.
ClearErrors FileOpen $0 $INSTDIR\file.dat r IfErrors done FileReadByte $0 $1 FileReadByte $0 $2 DetailPrint "$1 $2" FileClose $0 done:
Command introduced with NSIS v1.80
