Unexpected CRC Results

[[email protected]]

I'm reading the CRC value (using File.GetCRC()) of the running exe file (the application) as well as the CRC of a file on a network share drive. When they are different, I download the file from the network share and replace the running exe file (basically, an quick updater).

The problem is, as soon I copy the application file over to the network share folder, its CRC changes. It didn't seem to do this before. I'm wondering what might cause a file's CRC value to change when copied. Last week, I had this working and now it doesn't although I'm not sure what changed.

[[email protected]]

Here's the code, by the way.

function CheckForUpdate()

  if not (Folder.DoesExist(PATH_RAD_BIN) and Folder.DoesExist(PATH_RAD_DATA)) then
    log.fatal("This workstation is not connected to the General Drive.\r\nProgram will now exit.");
    Application.Exit(1);
  end

  local pMe = _ExeFolder .."\"..FILENAME_JPFO_DATA_MANAGER;
  local pUpdate = PATH_RAD_BIN .."\"..FILENAME_JPFO_DATA_MANAGER;

  if (File.DoesExist(pMe) and File.DoesExist(pUpdate)) then
    local nMyCRC = File.GetCRC(pMe);
    local nUpdateCRC = File.GetCRC(pUpdate);
    p(nMyCRC.."\r\n"..nUpdateCRC)

    if (nMyCRC ~= -1 and nUpdateCRC ~= -1) then

      if (nMyCRC ~= nUpdateCRC) then
        p(nMyCRC.."\r\n"..nUpdateCRC)
        local tDetails = Project.GetDetails();
        Project.UpdateRuntime(pUpdate, "", true, "Black", "Green", "Updating "..tDetails.Title, "Please wait...", "Update complete.", true, true);
      end

    end

  end

end 

[Ulrich]

Initially, I can think only of transfer errors during the file copy, or hardware issues, as the cause for a file getting a different CRC after being copied to a network folder. Or, less likely, something attached itself to the file.
When you copy this file back to the local disk, with a new name or to a different folder, so it does not overwrite the original, do the two local files now show different CRCs?

Ulrich

[Centauri Soldier]

I haven't tried that yet. I'll do that tomorrow when I get to work and report the results.

[[email protected]]

I found a better way to address the issue so need to figure out why this is happening.