Implement LEADTOOLS with Discord - Python

This tutorial shows how to implement a Discord bot in discord.py using the LEADTOOLS SDK.

Required Knowledge

Get familiar with the basic steps of creating a project by reviewing the Add References and Set a License tutorial and the basics of creating a discord.py bot, before working on the Implement LEADTOOLS with Discord - Python tutorial.

Disclaimer

discord.py is an open-source Python API for Discord applications.

Refer to GitHub's discord.py license for their terms of use. discord.py license is separate from LEADTOOLS licensing. To obtain a LEADTOOLS SDK license, refer to Setting a Runtime License.

Create the Project and Add the LEADTOOLS References

Start by following the discord.py quickstart guide. The references needed depend upon the purpose of the project.

This tutorial requires the following .NET DLLs:

• Leadtools.dll
• Leadtools.Codecs.dll
• Leadtools.Barcode.dll

For a complete list of which DLL files are required for your application, refer to Files to be Included With Your Application.

Set the License File

The License unlocks the features needed for the project. It must be set before any toolkit function is called. For details, including tutorials for different platforms, refer to Setting a Runtime License.

There are two types of runtime licenses:

• Evaluation license, obtained at the time the evaluation toolkit is downloaded. It allows the toolkit to be evaluated.
• Deployment license. If a Deployment license file and developer key are needed, refer to Obtaining a License.

Add LEADTOOLS References

Ensure that the LEADTOOLS pip package is installed by entering the following command in the Command Prompt:

pip install leadtools

With the project created, the references added, and the license set, coding can begin. In the Solution Explorer, open Project-Name.py and place the following at the top of Project-Name.py.

import sys 
 
# Import LEADTOOLS Demo common modules 
sys.path.append("C:/LEADTOOLS22/Examples/Common/Python") 
     
from DemosTools import * 
from UnlockSupport import Support 
 
import discord 
from discord import app_commands 
 
# Add reference to LEADTOOLS 
from leadtools import LibraryLoader 
LibraryLoader.add_reference("Leadtools") 
from Leadtools import * 
LibraryLoader.add_reference("Leadtools.Codecs") 
from Leadtools.Codecs import * 
LibraryLoader.add_reference("Leadtools.Barcode") 
from Leadtools.Barcode import * 
from System import * 
from System.Text import *  

Setting the LEADTOOLS license

In the on_ready() method add the following:

await tree.sync(guild=discord.Object(id=<REPLACE WITH GUILD ID>)) 
 
Support.set_license("<INSTALL DIR>/LEADTOOLS22/Support/Common/License") 

Next, add support for slash commands by adding the following below the client = discord.Client(intents=intents) line:

tree = app_commands.CommandTree(client) 

Read Barcodes From Uploaded Files

Add a new slash command that takes an image as an argument and outputs the content of any barcodes detected within the image.

Add the following method to the "Project-Name.py" file.

@tree.command(name = "barcode-read", description = "Reads any barcodes in an attached image", guild=discord.Object(id=<REPLACE WITH GUILD ID>)) 
async def barcode_read(interaction, arg1: discord.Attachment): 
    await interaction.response.send_message("Reading Barcode(s)") 
    codecs = RasterCodecs() 
    uri = Uri(arg1.url) 
    image = codecs.Load(uri) 
 
    barcode_engine_instance = BarcodeEngine()    
    data_array = barcode_engine_instance.Reader.ReadBarcodes(image.Result, LeadRect.Empty, 0, None) 
 
    sb = StringBuilder() 
    sb.AppendFormat(f"{data_array.Length} barcode(s) found") 
    sb.AppendLine() 
 
    for i in range(data_array.Length): 
        data = data_array[i] 
        sb.AppendFormat("Symbology: {0}, Location: {1}, Data: {2}", data.Symbology, data.Bounds, data.Value)  
        sb.AppendLine() 
    await interaction.channel.send(sb.ToString()) 

Run the Project

Run the project by pressing F5, or by selecting Debug -> Start Debugging. If the steps were followed correctly, the application runs and adds a new read-barcode slash command to a discord bot.

Wrap-up

This tutorial showcases how to implement the LEADTOOLS barcode SDK with a discord.py application. The downloadable project for this tutorial includes commands to OCR text, apply image processing commands, read barcodes, and convert files.

See Also

• LEADTOOLS SDK Download