Any method in SenseTalk/EggPlant to compare two binary files


I have a problem in getting comparing two binary files ( PDF, JPEJ ,bmp etc.) in Egg Plant (3.0) . These files lies at some physical location . I have to verify whether these files match or not . If I get the variance factor then it will be a bonus for me.


  • SenseTalkDougSenseTalkDoug ForumAdmin admin
    You can use Eggplant to compare binary files, but keep in mind that SenseTalk can't directly access files on the SUT unless the SUT's file system is mounted locally across the network. If a remote filesystem is mounted on the Eggplant machine, then SenseTalk's file access commands can be used to read remote files just as easily as files on the local Eggplant machine.

    SenseTalk's simple file access mechanism (accessing a file directly as a container) works well for text files but not so well for binary files. To compare binary files (assuming they are mounted on the local system) you'll need to do something like this:
    if binaryFilesAreEqual("/path/to/file1.jpg", "/path/to/file2.jpg") then
    	put "Files are the same"
    	put "Files are different"
    end if
    function binaryFilesAreEqual binary1, binary2
    	set count1 to the size of file binary1
    	set count2 to the size of file binary2
    	if count1 is not count2 then
    		return false -- files are different sizes
    	end if
    	open file binary1
    	read count1 8-bit integers from file binary1 into list1
    	close file binary1
    	open file binary2
    	read count2 8-bit integers from file binary2 into list2
    	close file binary2
    	if list1 = list2 then
    		return true -- Files are the same
    		return false -- Files are different
    	end if
    end binaryFilesAreEqual
    This isn't a terribly fast approach, but if you like, you can expand this to examine the contents of list1 and list2 to see which bytes of the file are different.

    For large files a more efficient approach would probably be to use the shell function to call the Unix command-line 'diff' tool to compare the files.
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