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How to convert erlang module (wxImage) const/array to a list in Elixir?

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0

I am trying to manipulate a "test.jpg" image in Elixir by using Erlang wxImage library, but I am getting an error. I do not know how to convert the array/const output to a list so I can use it in Elixir.

Also I do not know why there is a clause function error when the syntax seems to be alright?

defmodule Imedit2 do
 def readimg(image) do
 :ok, _file = File.open("happy737.txt", [:write])
 IO.puts("hi there")
 _output =
 image
 |> File.read!()
 |> :wxImage.getData()
 |> to_charlist()

 # IO.puts(is_list(output))
 # IO.puts(is_tuple(output))
 # IO.binwrite(file, output)
 # File.close(file)
 end
end

iex(58)> Imedit2.readimg("test.jpg")
hi there
** (FunctionClauseError) no function clause matching in :wxImage.getData/1

The following arguments were given to :wxImage.getData/1:

 # 1
 <<255, 216, 255, 226, 2, 28, 73, 67, 67, 95, 80, 82, 79, 70, 73, 76, 69, 0, 1,
 1, 0, 0, 2, 12, 108, 99, 109, 115, 2, 16, 0, 0, 109, 110, 116, 114, 82, 71,
 66, 32, 88, 89, 90, 32, 7, 220, 0, 1, 0, 25, ...>>

gen/wxImage.erl:405: :wxImage.getData/1
lib/imedit2.ex:5: Imedit2.readimg/1

elixir wxerlang

share|improve this question

edited Mar 24 at 4:43

Aleksei Matiushkin

85.6k95895

asked Mar 23 at 1:02

Arto KalishianArto Kalishian

2817

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You are passing a binary into the function :wxImage.getData/1. If you look at the documentation for that function, it expects a reference to the image, not the images binary data. I have never used this library before, but it looks like you need to call :wxImage.loadFile/2,3,4 in order to load your image from a file. You will probably also need to call the new/0 function to first get a blank image reference.
  
  – Justin Wood
  Mar 23 at 1:19
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I thought that File.read loads the image and that's why there is an output of numbers as a result of wximage processing the loaded image.
  
  – Arto Kalishian
  Mar 23 at 1:56
  

  
  
  
  

add a comment | 

0

I am trying to manipulate a "test.jpg" image in Elixir by using Erlang wxImage library, but I am getting an error. I do not know how to convert the array/const output to a list so I can use it in Elixir.

Also I do not know why there is a clause function error when the syntax seems to be alright?

defmodule Imedit2 do
 def readimg(image) do
 :ok, _file = File.open("happy737.txt", [:write])
 IO.puts("hi there")
 _output =
 image
 |> File.read!()
 |> :wxImage.getData()
 |> to_charlist()

 # IO.puts(is_list(output))
 # IO.puts(is_tuple(output))
 # IO.binwrite(file, output)
 # File.close(file)
 end
end

iex(58)> Imedit2.readimg("test.jpg")
hi there
** (FunctionClauseError) no function clause matching in :wxImage.getData/1

The following arguments were given to :wxImage.getData/1:

 # 1
 <<255, 216, 255, 226, 2, 28, 73, 67, 67, 95, 80, 82, 79, 70, 73, 76, 69, 0, 1,
 1, 0, 0, 2, 12, 108, 99, 109, 115, 2, 16, 0, 0, 109, 110, 116, 114, 82, 71,
 66, 32, 88, 89, 90, 32, 7, 220, 0, 1, 0, 25, ...>>

gen/wxImage.erl:405: :wxImage.getData/1
lib/imedit2.ex:5: Imedit2.readimg/1

elixir wxerlang

share|improve this question

edited Mar 24 at 4:43

Aleksei Matiushkin

85.6k95895

asked Mar 23 at 1:02

Arto KalishianArto Kalishian

2817

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You are passing a binary into the function :wxImage.getData/1. If you look at the documentation for that function, it expects a reference to the image, not the images binary data. I have never used this library before, but it looks like you need to call :wxImage.loadFile/2,3,4 in order to load your image from a file. You will probably also need to call the new/0 function to first get a blank image reference.
  
  – Justin Wood
  Mar 23 at 1:19
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I thought that File.read loads the image and that's why there is an output of numbers as a result of wximage processing the loaded image.
  
  – Arto Kalishian
  Mar 23 at 1:56
  

  
  
  
  

add a comment | 

I am trying to manipulate a "test.jpg" image in Elixir by using Erlang wxImage library, but I am getting an error. I do not know how to convert the array/const output to a list so I can use it in Elixir.

Also I do not know why there is a clause function error when the syntax seems to be alright?

defmodule Imedit2 do
 def readimg(image) do
 :ok, _file = File.open("happy737.txt", [:write])
 IO.puts("hi there")
 _output =
 image
 |> File.read!()
 |> :wxImage.getData()
 |> to_charlist()

 # IO.puts(is_list(output))
 # IO.puts(is_tuple(output))
 # IO.binwrite(file, output)
 # File.close(file)
 end
end

iex(58)> Imedit2.readimg("test.jpg")
hi there
** (FunctionClauseError) no function clause matching in :wxImage.getData/1

The following arguments were given to :wxImage.getData/1:

 # 1
 <<255, 216, 255, 226, 2, 28, 73, 67, 67, 95, 80, 82, 79, 70, 73, 76, 69, 0, 1,
 1, 0, 0, 2, 12, 108, 99, 109, 115, 2, 16, 0, 0, 109, 110, 116, 114, 82, 71,
 66, 32, 88, 89, 90, 32, 7, 220, 0, 1, 0, 25, ...>>

gen/wxImage.erl:405: :wxImage.getData/1
lib/imedit2.ex:5: Imedit2.readimg/1

elixir wxerlang

share|improve this question

edited Mar 24 at 4:43

Aleksei Matiushkin

85.6k95895

asked Mar 23 at 1:02

Arto KalishianArto Kalishian

2817

defmodule Imedit2 do
 def readimg(image) do
 :ok, _file = File.open("happy737.txt", [:write])
 IO.puts("hi there")
 _output =
 image
 |> File.read!()
 |> :wxImage.getData()
 |> to_charlist()

 # IO.puts(is_list(output))
 # IO.puts(is_tuple(output))
 # IO.binwrite(file, output)
 # File.close(file)
 end
end

iex(58)> Imedit2.readimg("test.jpg")
hi there
** (FunctionClauseError) no function clause matching in :wxImage.getData/1

The following arguments were given to :wxImage.getData/1:

 # 1
 <<255, 216, 255, 226, 2, 28, 73, 67, 67, 95, 80, 82, 79, 70, 73, 76, 69, 0, 1,
 1, 0, 0, 2, 12, 108, 99, 109, 115, 2, 16, 0, 0, 109, 110, 116, 114, 82, 71,
 66, 32, 88, 89, 90, 32, 7, 220, 0, 1, 0, 25, ...>>

gen/wxImage.erl:405: :wxImage.getData/1
lib/imedit2.ex:5: Imedit2.readimg/1

share|improve this question

edited Mar 24 at 4:43

Aleksei Matiushkin

85.6k95895

asked Mar 23 at 1:02

Arto KalishianArto Kalishian

2817

share|improve this question

edited Mar 24 at 4:43

Aleksei Matiushkin

85.6k95895

asked Mar 23 at 1:02

Arto KalishianArto Kalishian

2817

edited Mar 24 at 4:43

Aleksei Matiushkin

85.6k95895

edited Mar 24 at 4:43

Aleksei Matiushkin

85.6k95895

asked Mar 23 at 1:02

Arto KalishianArto Kalishian

2817

asked Mar 23 at 1:02

Arto KalishianArto Kalishian

2817

1 Answer
1

active

oldest

votes

1

I had a play around with :wxImage and I found a couple of problems with your code:

1. You need to call :wx.new() to to initialize wx before any of the :wxImage functions will work.


2. The argument togetData/1 should be the image handle, not the binary file data. From the docs:

wxImage()

An object reference, The representation is internal and can be changed without notice. It can't be used for comparsion stored on disc or distributed for use on other nodes.

And for getData/1:

getData(This) -> binary()

Types

This = wxImage()

So you can do it like this:

def readimg(image) do
 :wx.new()

 data =
 image
 |> String.to_charlist()
 |> :wxImage.new()
 |> :wxImage.getData()
 |> :binary.bin_to_list()

 :wx.destroy()
 data
end

But beware that the bin_to_list/1 call is slow, and I don't think you need it anyway. You probably want to stop at :wxImage.new(), keep the handle in a variable, and use that to call whatever other :wxImage functions you need.

share|improve this answer

edited Mar 23 at 4:02

answered Mar 23 at 3:53

Adam MillerchipAdam Millerchip

3,17311731

add a comment | 

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1

I had a play around with :wxImage and I found a couple of problems with your code:

1. You need to call :wx.new() to to initialize wx before any of the :wxImage functions will work.


2. The argument togetData/1 should be the image handle, not the binary file data. From the docs:

wxImage()

An object reference, The representation is internal and can be changed without notice. It can't be used for comparsion stored on disc or distributed for use on other nodes.

And for getData/1:

getData(This) -> binary()

Types

This = wxImage()

So you can do it like this:

def readimg(image) do
 :wx.new()

 data =
 image
 |> String.to_charlist()
 |> :wxImage.new()
 |> :wxImage.getData()
 |> :binary.bin_to_list()

 :wx.destroy()
 data
end

But beware that the bin_to_list/1 call is slow, and I don't think you need it anyway. You probably want to stop at :wxImage.new(), keep the handle in a variable, and use that to call whatever other :wxImage functions you need.

share|improve this answer

edited Mar 23 at 4:02

answered Mar 23 at 3:53

Adam MillerchipAdam Millerchip

3,17311731

add a comment | 

1

I had a play around with :wxImage and I found a couple of problems with your code:

1. You need to call :wx.new() to to initialize wx before any of the :wxImage functions will work.


2. The argument togetData/1 should be the image handle, not the binary file data. From the docs:

wxImage()

An object reference, The representation is internal and can be changed without notice. It can't be used for comparsion stored on disc or distributed for use on other nodes.

And for getData/1:

getData(This) -> binary()

Types

This = wxImage()

So you can do it like this:

def readimg(image) do
 :wx.new()

 data =
 image
 |> String.to_charlist()
 |> :wxImage.new()
 |> :wxImage.getData()
 |> :binary.bin_to_list()

 :wx.destroy()
 data
end

But beware that the bin_to_list/1 call is slow, and I don't think you need it anyway. You probably want to stop at :wxImage.new(), keep the handle in a variable, and use that to call whatever other :wxImage functions you need.

share|improve this answer

edited Mar 23 at 4:02

answered Mar 23 at 3:53

Adam MillerchipAdam Millerchip

3,17311731

add a comment | 

I had a play around with :wxImage and I found a couple of problems with your code:

1. You need to call :wx.new() to to initialize wx before any of the :wxImage functions will work.


2. The argument togetData/1 should be the image handle, not the binary file data. From the docs:

wxImage()

An object reference, The representation is internal and can be changed without notice. It can't be used for comparsion stored on disc or distributed for use on other nodes.

And for getData/1:

getData(This) -> binary()

Types

This = wxImage()

So you can do it like this:

def readimg(image) do
 :wx.new()

 data =
 image
 |> String.to_charlist()
 |> :wxImage.new()
 |> :wxImage.getData()
 |> :binary.bin_to_list()

 :wx.destroy()
 data
end

But beware that the bin_to_list/1 call is slow, and I don't think you need it anyway. You probably want to stop at :wxImage.new(), keep the handle in a variable, and use that to call whatever other :wxImage functions you need.

share|improve this answer

edited Mar 23 at 4:02

answered Mar 23 at 3:53

Adam MillerchipAdam Millerchip

3,17311731

def readimg(image) do
 :wx.new()

 data =
 image
 |> String.to_charlist()
 |> :wxImage.new()
 |> :wxImage.getData()
 |> :binary.bin_to_list()

 :wx.destroy()
 data
end

share|improve this answer

edited Mar 23 at 4:02

answered Mar 23 at 3:53

Adam MillerchipAdam Millerchip

3,17311731

answered Mar 23 at 3:53

Adam MillerchipAdam Millerchip

3,17311731

answered Mar 23 at 3:53

Adam MillerchipAdam Millerchip

3,17311731