read/write binary files in tcl

[adekunleadekoya]

i need sample code that will read from a binary file like gif and store what is read into a variable and later - supposedly after preprocessing - write back d bytes of data stored in the variable into another binary file.

while the bytes are stored inside the variable i may want to access them byte-by-byte to perform the processing on them before writing them to the second binary binary file

 

[adekunleadekoya]

fconfigure $fid -translation binary

scan [string range $contents i i] %c strA

above command did the magic

thanks