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  • Category: Windows

    How to handle method must have a return type in c# windows forms

    Below is my code in Form1.cs page.In the below code near <pre lang="C#">// Run the app

    public static void Main( )
    {
    Application.Run(new TestForm( ));
    }</pre> in the last and near the constructor <pre lang="C#">// Constructor

    public TestForm()
    {</pre> i am getting error as method must have return type while compling and the code in my
    <b>program.cs is</b>

    <pre lang="C#">using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Threading.Tasks;
    using System.Windows.Forms;


    namespace DssToWav
    {
    static class Program
    {
    /// <summary>
    /// The main entry point for the application.
    /// </summary>
    [STAThread]
    static void Main()
    {
    Application.EnableVisualStyles();
    Application.SetCompatibleTextRenderingDefault(false);
    Application.Run(new Form1());
    }
    }
    }</pre>


    <b>Form1.cs</b>

    <pre><pre lang="C#">using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    using System.Windows.Forms;
    using System;
    using System.IO;
    using Arbingersys.Audio.Aumplib;

    namespace DssToWav
    {
    public partial class Form1 : Form
    {
    public Form1()
    {
    InitializeComponent();
    }
    // Declarations hence


    private string inputFile = "Not set";
    private string outputFile = "Not set";


    private Label label1;

    private ComboBox comboBox1;
    private Label comboBox1Label;
    private Button convertButton;
    private static ProgressBar progressBar1;

    // Source file open button and label:

    private Button sourceFileButton;
    private Label sourceFileLabel;


    // Destination file save button and label:

    private Button destFileButton;
    private Label destFileLabel;


    string[] convertFormat = new string[] {"WAV", "MP3", "AU", "AIFF"};

    private Aumpel audioConverter = new Aumpel();
    private Aumpel.soundFormat inputFileFormat;
    private Aumpel.soundFormat outputFileFormat;


    // Constructor

    public TestForm()
    {

    // Create the objects

    this.label1 = new Label();
    this.convertButton = new Button();

    progressBar1 = new ProgressBar();

    this.sourceFileButton = new Button();
    this.sourceFileLabel = new Label();

    this.destFileButton = new Button();
    this.destFileLabel = new Label();

    this.comboBox1 = new ComboBox();
    this.comboBox1Label = new Label();



    // Set the form's title

    this.Text = "TestForm";


    // Set up the output label

    label1.Location = new System.Drawing.Point (10, 10);
    label1.Text = "Select a file to convert and a destination.";
    label1.Size = new System.Drawing.Size (216, 16);


    // Set convert button location

    convertButton.Location = new System.Drawing.Point (300,80);
    convertButton.Size = new System.Drawing.Size (65, 22);
    convertButton.Text = "&Convert";


    // Set source file button location

    sourceFileButton.Location = new System.Drawing.Point (10,30);
    sourceFileButton.Size = new System.Drawing.Size (100, 22);
    sourceFileButton.Text = "&File to convert:";


    // Set source file label location

    sourceFileLabel.Location = new System.Drawing.Point (10, 55);
    sourceFileLabel.Size = new System.Drawing.Size (375, 22);
    sourceFileLabel.Text = inputFile;


    // Set destination file button location

    destFileButton.Location = new System.Drawing.Point (10,80);
    destFileButton.Size = new System.Drawing.Size (100, 22);
    destFileButton.Text = "&Save to:";


    // Set destination file label location

    destFileLabel.Location = new System.Drawing.Point (10, 105);
    destFileLabel.Size = new System.Drawing.Size (375, 22);
    destFileLabel.Text = outputFile;


    // Conversion file types

    comboBox1Label.Location = new System.Drawing.Point (120,80);
    comboBox1Label.Size = new System.Drawing.Size(90,16);
    comboBox1Label.Text = "Convert to:";

    comboBox1.Location = new System.Drawing.Point (216,80);
    comboBox1.Size = new System.Drawing.Size(75,10);

    this.comboBox1.Items.AddRange(convertFormat);



    // Progress Bar

    progressBar1.Location = new System.Drawing.Point(10, 145);
    progressBar1.Size = new System.Drawing.Size(375, 22);
    progressBar1.Minimum = 0;
    progressBar1.Maximum = 100;



    // Set up the event handlers

    sourceFileButton.Click +=
    new System.EventHandler (this.sourceFileButton_Click);

    destFileButton.Click +=
    new System.EventHandler (this.destFileButton_Click);

    convertButton.Click +=
    new System.EventHandler (this.convertButton_Click);



    // Add the controls and set the client area

    this.AutoScaleBaseSize = new System.Drawing.Size (5, 13);
    this.ClientSize = new System.Drawing.Size (400, 200);
    this.Controls.Add (this.convertButton);
    this.Controls.Add (this.sourceFileButton);
    this.Controls.Add (this.sourceFileLabel);
    this.Controls.Add (this.destFileButton);
    this.Controls.Add (this.destFileLabel);
    this.Controls.Add (this.label1);
    this.Controls.Add (this.comboBox1);
    this.Controls.Add (this.comboBox1Label);
    this.Controls.Add (progressBar1);


    }



    // Delegates for decoding

    public static int soundFileSize = 0;


    // Conversion callback (lame,libsndfile)

    private static void
    ReportStatus(int totalBytes,
    int processedBytes, Aumpel aumpelObj)
    {
    progressBar1.Value =
    (int)(((float)processedBytes/(float)totalBytes)*100);
    }


    // Decoding callback (madlldlib)

    private static bool
    ReportStatusMad(uint frameCount, uint byteCount,
    ref MadlldlibWrapper.mad_header mh)
    {

    progressBar1.Value =
    (int)(((float)byteCount/(float)soundFileSize)*100);

    return true;
    }



    private void
    ShowExceptionMsg(Exception e)
    {
    MessageBox.Show("Exception: " + e.Message,
    "Exception!", MessageBoxButtons.OK);
    }


    // Event handlers hence

    protected void
    sourceFileButton_Click (object sender, System.EventArgs e)
    {

    // Show Open File dialog

    OpenFileDialog openFile = new OpenFileDialog();
    openFile.Filter = "MP3 (*.mp3)|*.mp3|WAV (*.wav)|" +
    "*.wav|All Files (*.*)|*.*";

    openFile.FileName = "" ;
    openFile.CheckFileExists = true;
    openFile.CheckPathExists = true;


    if ( openFile.ShowDialog() != DialogResult.OK )
    return;


    // Set input file formation

    try
    {
    inputFileFormat =
    audioConverter.CheckSoundFormat(openFile.FileName);
    }
    catch(Exception ex)
    {
    ShowExceptionMsg(ex);
    return;
    }

    sourceFileLabel.Text = inputFile = openFile.FileName;

    }


    protected void
    destFileButton_Click (object sender, System.EventArgs e)
    {

    // Show Open File dialog

    SaveFileDialog saveFile = new SaveFileDialog();
    saveFile.Filter = "MP3 (*.mp3)|*.mp3|" +
    "WAV (*.wav)|*.wav|" +
    "AIFF (*.aiff)|*.aiff|" +
    "AU (*.au)|*.au|" +
    "All Files (*.*)|*.*";


    if ( saveFile.ShowDialog() != DialogResult.OK )
    return;


    // Set input file formation

    destFileLabel.Text = outputFile = saveFile.FileName;

    }


    protected void
    convertButton_Click (object sender, System.EventArgs e)
    {

    // Set conversion type

    switch((string)comboBox1.SelectedItem)
    {
    case "WAV":
    outputFileFormat = Aumpel.soundFormat.WAV;
    break;
    case "MP3":
    outputFileFormat = Aumpel.soundFormat.MP3;
    break;
    case "AU":
    outputFileFormat = Aumpel.soundFormat.AU;
    break;
    case "AIFF":
    outputFileFormat = Aumpel.soundFormat.AIFF;
    break;
    default:
    MessageBox.Show("You must select a type to convert to.",
    "Error", MessageBoxButtons.OK);
    return;
    }


    // Convert to MP3

    if ( (int)outputFileFormat == (int)Aumpel.soundFormat.MP3 )
    {

    try
    {

    Aumpel.Reporter defaultCallback =
    new Aumpel.Reporter(ReportStatus);

    audioConverter.Convert(inputFile,
    (int)inputFileFormat, outputFile,
    (int)outputFileFormat, defaultCallback);

    progressBar1.Value = 0;

    destFileLabel.Text = outputFile = "";
    sourceFileLabel.Text = inputFile = "";

    MessageBox.Show("Conversion finished.",
    "Done.", MessageBoxButtons.OK);

    }
    catch (Exception ex)
    {
    ShowExceptionMsg(ex);
    return;
    }

    }

    // From MP3 (using named pipe):

    else if ( (int)inputFileFormat == (int)Aumpel.soundFormat.MP3 )
    {

    try
    {

    MadlldlibWrapper.Callback defaultCallback =
    new MadlldlibWrapper.Callback(ReportStatusMad);

    // Determine file size
    FileInfo fi = new FileInfo(inputFile);
    soundFileSize = (int)fi.Length;

    audioConverter.Convert(inputFile,
    outputFile, outputFileFormat, defaultCallback);
    progressBar1.Value = 0;

    destFileLabel.Text = outputFile = "";
    sourceFileLabel.Text = inputFile = "";

    MessageBox.Show("Conversion finished.",
    "Done.", MessageBoxButtons.OK);

    }
    catch (Exception ex)
    {
    ShowExceptionMsg(ex);
    return;
    }

    }

    // Non-MP3 soundfile conversion:

    else
    {

    try
    {

    Aumpel.Reporter defaultCallback =
    new Aumpel.Reporter(ReportStatus);

    audioConverter.Convert(inputFile,
    (int)inputFileFormat,
    outputFile,
    (int)(outputFileFormat | Aumpel.soundFormat.PCM_16),
    defaultCallback);

    progressBar1.Value = 0;

    destFileLabel.Text = outputFile = "";
    sourceFileLabel.Text = inputFile = "";

    MessageBox.Show("Conversion finished.",
    "Done.", MessageBoxButtons.OK);

    }
    catch (Exception ex)
    {
    ShowExceptionMsg(ex);
    return;
    }

    }



    }


    // Run the app

    public static void Main( )
    {
    Application.Run(new TestForm( ));
    }

    }
    }</pre></pre>
  • #768210
    Hi Kavitha.

    Instead of posting all the code can you post the method relate code where the error message is flagged. So that we can easily understand and can provide proper solution to you.

    Sridhar Thota.
    Editor: DNS Forum.


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