C# Convert image to hex and vice versa

    Here I want to show you how to convert image to hex format and vice versa  using C# language

To convert image to hex data we need only one line of code.

public void ConvertImageToHex(string filePath){
    return BitConverter.ToString(File.ReadAllBytes(fName));
} 

To bring back hex string to image we need to do a little bit more

// saves hex string image to the pathToSave
public static void SaveImageFromHex(string hex, string pathToSave)
{
    // Call function to Convert the hex data to byte array
    byte[] newByte = ToByteArray(hexImgData);
    MemoryStream memStream = new MemoryStream(newByte);

    // Save the memorystream to file
    Bitmap.FromStream(memStream).Save(pathToSave);
}

// Function converts hex data into byte array
private static byte[] ToByteArray(String HexString)
{
    int NumberChars = HexString.Length;
    byte[] bytes = new byte[NumberChars / 2];

    for (int i = 0; i < NumberChars; i += 2)
    {
        bytes[i / 2] = Convert.ToByte(HexString.Substring(i, 2), 16);
    }
    return bytes;
}

original posts: http://www.nullskull.com/faq/40/convert-hex-image-data-to-jpeg.aspx http://stackoverflow.com/questions/18717182/convert-jpeg-image-to-hex-format

JavaFX Table view

I'm writing this post just to remember to myself how did I achieved some goals.
So this first is about JavaFX Table view.

// Allow TableView select multiply rows  

tableView.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);



//Allow TableView to select single cell      

tableView.getSelectionModel().setCellSelectionEnabled(true);



//TableColumn<Batch, String> codeColumn; 

codeColumn.setCellValueFactory(new PropertyValueFactory<Batch, String>(

                "code"));



//Make the codeColumn editable 

codeColumn.setCellFactory(TextFieldTableCell.<Batch> forTableColumn());



//Register listner on finish editing cell 

codeColumn.setOnEditCommit(value -> {

            System.out.println(value.getRowValue().getCode());

        });



// Make column resizable 

codeColumn.prefWidthProperty()

                .bind(tableView.widthProperty().divide(3));







nameColumn.setCellValueFactory(new PropertyValueFactory<Batch, String>(

                "name"));



//If you have some double field than you have to

// use DoubleStringConverter from javafx.util.converters   

nameColumn.setCellFactory(TextFieldTableCell

                .<Batch, String> forTableColumn(new DefaultStringConverter()));



nameColumn.setOnEditCommit(value -> {

            System.out.println(value.getNewValue());

            System.out.println(value.getRowValue().getCode());

        });





nameColumn.prefWidthProperty().bind(tableView.widthProperty().divide(3));





btnCol.setMinWidth(150);





//Creating column which holds buttons 

btnCol.setCellValueFactory(new Callback<CellDataFeatures<Batch, Batch>, ObservableValue<Batch>>() {

            @Override

            public ObservableValue<Batch> call(

                    CellDataFeatures<Batch, Batch> features) {

                return new ReadOnlyObjectWrapper(features.getValue());

            }

        });



btnCol.prefWidthProperty().bind(tableView.widthProperty().divide(3));



//Fill column with buttons 

btnCol.setCellFactory(new Callback<TableColumn<Batch, Batch>, TableCell<Batch, Batch>>() {

            @Override

            public TableCell<Batch, Batch> call(TableColumn<Batch, Batch> btnCol) {

                return new TableCell<Batch, Batch>() {

                    final Button button = new Button();

                    {

                        button.setMinWidth(130);

                        button.setText("save");

                    }



                    @Override

                    public void updateItem(final Batch person, boolean empty) {

                        super.updateItem(person, empty);

                        //Setting user data to Model

                        button.setUserData(person);

                        setGraphic(button);

                        button.setOnAction(new EventHandler<ActionEvent>() {

                            @Override

                            public void handle(ActionEvent event) {

                               

                                Button btnButton = (Button)event.getSource();

                                //Retrieving user data which is Batch

                                Batch batch = (Batch)btnButton.getUserData();

                                System.out.println(batch.getCode());

                                System.out.println(batch.getName());

                            }

                        });

                    }

                };

            }

        });



//Filling table with data  

tableView.setItems(new BatchService().list());

How to use ControlsFX Autocomplete

First, lets create Fxml file which is the view layer

<?xml version="1.0" encoding="UTF-8"?>



<?import javafx.scene.control.*?>

<?import java.lang.*?>

<?import javafx.scene.layout.*?>

<?import javafx.scene.layout.StackPane?>



<GridPane prefHeight="164.0" prefWidth="403.0" xmlns="http://javafx.com/javafx/8" 

          xmlns:fx="http://javafx.com/fxml/1" fx:controller="tj.daqiq.operations.controller.ReceiptController">

  <columnConstraints>

    <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />

    <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />

  </columnConstraints>

  <rowConstraints>

    <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />

    <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />

    <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />

  </rowConstraints>

   <children>

      <Label prefHeight="15.0" prefWidth="72.0" text="From" />

      <Label text="To" GridPane.rowIndex="1" />

      <TextField fx:id="txtAuto" prefHeight="18.0" prefWidth="71.0" GridPane.columnIndex="1" />

      <TextField GridPane.columnIndex="1" GridPane.rowIndex="1" />

   </children>

</GridPane>

Here we placed TextField.


Next in the controller we will bind ControlsFX autocomplete

package tj.daqiq.operations.controller;



import java.net.URL;

import java.util.ResourceBundle;



import org.controlsfx.control.textfield.TextFields;



import tj.daqiq.warehouse.services.BatchService;

import javafx.fxml.FXML;

import javafx.fxml.Initializable;

import javafx.scene.control.TextField;



public class ReceiptController implements Initializable {



    @FXML

    private TextField txtAuto;



    @Override

    public void initialize(URL location, ResourceBundle resources) {

        BatchService service = new BatchService();



        TextFields.bindAutoCompletion(txtAuto, t-> {

            return service.getSuggestions("code", t.getUserText());

        });

    }

}

The following code will get records from database using hibernate

    @SuppressWarnings("unchecked")

    @Override

    public List<String> getSuggestions(String fieldName, String searchString) {

        logger.info("Getting batch list for autocomplete");

        List<String> list = null;

        HibernateUtil.getSessionFactory().openSession().close();

        Session s = HibernateUtil.getSessionFactory().openSession();

        try {

            s.beginTransaction();

            Query query = s.createQuery("select B." + fieldName + " from Batch B where B."+fieldName + " LIKE :search");

            list = query.setParameter("search", "%"+searchString+"%").setMaxResults(10).list();

            s.getTransaction().commit();

        } catch (Exception ex) {

            logger.error("Other exception {}", ex);

        } finally {

            s.close();

        }       

        return list;

    } 

Thats all!