This is our old Q&A Site. Please post any new questions and answers at ask.wireshark.org.

Dialog function execution before OK is pressed

0

I am trying to launch a dialog window from an add_button API call. However, the function assigned to the new_dialog executes before I click OK and the code runs through to the function and fails to refresh.

   local function reloadAPList()
      -- Request new filename from user
      new_dialog("Enter File (without extension)",
                 function (basename) filename = basename end,
                 "Filename")

      message("Opening file: " .. filename)
      local csv_file = assert(io.open(filename, "r"))

      if csv_file==nil then
          warn(err)
          return
      end

      -- Read CSV line
      local line = csv_file:read()

      -- Flush out old table contents
      for k,v in pairs(apList) do
         apList[k] = nil
      end

      -- Build AP Object Name List table
      apList = fromCSV(line)
   end

   aw:add_button("Reload", reloadAPList )

If I click the reload button again I can see that it attempts to open the file matching the string I passed in on the previous attempt.

Any ideas why it does not take the filename I pass in the first time round?

asked 15 May '15, 17:34

carlwain74's gravatar image

carlwain74
1●3●3●4
accept rate: 0%

I guess, we would need more of your code to recreate the problem.

(17 May '15, 06:14) Kurt Knochner ♦

Essentially all you need to do is invoke a new dialog from within a button function. You can see above that aw:add_button calls reloadApList when the button is clicked. In reloadApList I call new_dialog with an inline function to assign the string to a local variable (not shown in code snippet).

The dialog box launches, but the message call after the new_dialog prints the filename from the previous button click.

I hope that helps..

(17 May '15, 20:55) carlwain74

can you please test the following code and post the output of message() here?

   local function reloadAPList()

   local filename = "_notset_"

   local function assign_filename(basename)
      message("Filename before:" .. filename)
      filename = basename
      message("Filename after:" .. filename)
   end

      -- Request new filename from user
      new_dialog("Enter File (without extension)", assign_filename, "Filename")

      message("Opening file: " .. filename)
(17 May '15, 21:42) Kurt Knochner ♦

This is the output in the console

5/18/2015 8:16:05 AM MESSAGE: Opening file: c:\temp\AP_Batch.csv
5/18/2015 8:16:34 AM MESSAGE: Filename before:c:\temp\AP_Batch.csv
5/18/2015 8:16:34 AM MESSAGE: Filename after:test.csv

The first log entry appeared when I clicked the button. The second and third appeared after I entered a string and clicked OK.

Note that test.csv does not exist and I was expecting the assert on io.open to detect that.

(18 May '15, 08:19) carlwain74

The assert came when I clicked the button for a second time. It looks like the code after the new_dialog executes before the dialog is closed.

(18 May '15, 08:30) carlwain74

strange thing... please file a bug report at https://bugs.wireshark.org

(18 May '15, 08:46) Kurt Knochner ♦
showing 5 of 6 show 1 more comments
One Answer:
active answersoldest answersnewest answerspopular answers
0

I don't think this is a bug. The new_dialog() function is non-blocking, creating a non-modal dialog window. So in the question's script it's creating the dialog window but immediately returning to process more of the Lua code, as it should.

I think the right way to code this in Lua is to put the rest of the logic that is currently after new_dialog() into the callback function assigned by new_dialog(). In other words, this:

local function reloadAPList(basename)
    filename = basename

    message("Opening file: " .. filename)
    local csv_file = assert(io.open(filename, "r"))

    if csv_file==nil then
        warn(err)
        return
    end

    -- Read CSV line
    local line = csv_file:read()

    -- Flush out old table contents
    for k,v in pairs(apList) do
        apList[k] = nil
    end

    -- Build AP Object Name List table
    apList = fromCSV(line)
end

local function get_filename()
    -- Request new filename from user
    new_dialog("Enter File (without extension)",
               reloadAPList,
               "Filename")
end

aw:add_button("Reload", get_filename )
permanent link

answered 29 Jun '15, 16:16

Hadriel's gravatar image

Hadriel
2.7k●2●9●39
accept rate: 18%

Your answer
toggle preview

Follow this question

By Email:

Once you sign in you will be able to subscribe for any updates here

By RSS:

Answers

Answers and Comments

Markdown Basics

  • *italic* or _italic_
  • **bold** or __bold__
  • link:[text](http://url.com/ "title")
  • image?![alt text](/path/img.jpg "title")
  • numbered list: 1. Foo 2. Bar
  • to add a line break simply add two spaces to where you would like the new line to be.
  • basic HTML tags are also supported

learn more about Markdown

Question tags:

×1,620
×431

question asked: 15 May '15, 17:34

question was seen: 1,322 times

last updated: 29 Jun '15, 16:16

Related questions

Lua: How can I detect a change of capture file?

Why all the elements are shown in dissection tree?

update decryption table from Lua

How to create multiple dissectors for same port number

Is there any way to optimize lua dissectors

How we can add Browse button in preferences for a Lua dissector?

Convert us-timestamp to absolute_time

Which one is the best way to develop new plugin either in C or LUA.

How do .lua files get input from wireshark?

How do I run a Lua script with tshark?

about | faq | privacy | support | contact

p​o​w​e​r​e​d by O​S​Q​A