Develop Reference

EmguCV never open ".jpg" file but open only ".tif" files..Why?

I am using EmguCV in Visual Studio 2022 and I am simple trying to read and open my image but it only opens .tif image files not .jpg or any other file...
When I try to open any .jpg file it gives me an exception openCV:index out of bound
Here:
I also debugged it and find something like it is not reading file when I passed it to EmguCV image structure "Image<Bgr,byte> imgFile=new Image<Bgr,byte>(filename)"
while it is loading file from dialogue but not passing forward from this structure.
Here's the Debug SS:
Code:
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 Emgu;
using Emgu.CV;
using Emgu.CV.Structure;
using Emgu.CV.Util;
namespace test_EmguCV
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void openToolStripMenuItem_Click(object sender, EventArgs e)
{
try
{
OpenFileDialog ofd = new OpenFileDialog();
if (ofd.ShowDialog() == DialogResult.OK)
{
Image<Bgr, byte> imgFile = new Image<Bgr, byte>(ofd.FileName);
pictureBox1.Image = imgFile.Bitmap;
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
private void exToolStripMenuItem_Click(object sender, EventArgs e)
{
this.Close();
}
}
}
Another Imp:
My friend is also doing the same work with me and he is using the same ide same mehtods same references same dll files but his is running fine but not of mine..

I just tried your code snippet in a new Form and I can say that I can successfully load a .jpg image and display it in a PictureBox. Make sure your image is not corrupted in the first place.
Here's my code:
private void button1_Click(object sender, EventArgs e)
{
try
{
OpenFileDialog ofd = new OpenFileDialog();
if (ofd.ShowDialog() == DialogResult.OK)
{
Image<Bgr, byte> imgFile = new Image<Bgr, byte>(ofd.FileName);
pictureBox1.Image = imgFile.ToBitmap();
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
Note that it's imgFile.ToBitmap(), not imgFile.Bitmap()
Also I would suggest you to switch to Mat instead of Image<>. More info from OpenCV docs
With Mat the code to get the image is as easy as:
Mat imgFile = new Mat(ofd.FileName);
More info about Mat in EmguCV here

How to connect a gsm modem AUTOMATICALLY to available COM ports (without combobox)

THIS QUESTION MAY SEAM A DUPLICATE, BUT NOT. after a long period of search on internet and no, result, then had to seek for assistance.
All solutions apply to loading available ports in a combo box and the user checks one at a go. But the automation feature then dies.
thus, im looking for assistance on how the modem can connect automatically from the available ports without user interaction (USER FRIENDLINESS)
FOR THE COMBO BOX, IT IS WORKING FINE AS BELOW,
using GsmComm.GsmCommunication;
using GsmComm.PduConverter;
using GsmComm.Server;
using MySql.Data.MySqlClient;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Configuration;
using System.Data;
using System.Drawing;
using System.IO.Ports;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace COMM_All
{
public partial class Comm_F : Form
{
public Comm_F()
{
InitializeComponent();
}
private void COM_PORTS()
{
string[] ports = SerialPort.GetPortNames();
txtGPort1.Items.AddRange(ports);
txtGPort2.Items.AddRange(ports);
}
private void Form1_Load(object sender, EventArgs e)
{
COM_PORTS();
}
private void Modem1_Click(object sender, EventArgs e)
{
if (txtGPort1.Text == "") { MessageBox.Show("Invalid Port Name"); return; }
comm = new GsmCommMain(txtGPort1.Text, 9600, 8);
Cursor.Current = Cursors.Default;
bool retry;
do
{
retry = false;
try
{
Cursor.Current = Cursors.WaitCursor; comm.Open(); Cursor.Current = Cursors.Default;
//MessageBox.Show("Modem Connected Sucessfully");
txtGStatus1.Text = "Connected Sucessfully";
comm.EnableMessageNotifications();
MessageBox.Show("Message notifications activated.");
}
catch (Exception)
{
Cursor.Current = Cursors.Default;
if (MessageBox.Show(this, "GSM Modem is not available", "Check",
MessageBoxButtons.RetryCancel, MessageBoxIcon.Warning) == DialogResult.Retry)
retry = true;
else { return; }
}
} while (retry);
}
}
}
Note: Computer has multiple usb devices;

ArgumentException "parameter is incorrect"

I'm trying to make a code that converts memorystream to a png image, but I'm getting a ArgumentException "parameter is incorrect" error on using(Image img = Image.FromStream(ms)). It doesn't specify it any further so I don't know why I'm getting the error and what am I supposed to do to it.
Also, how do I use the Width parameter with img.Save(filename + ".png", ImageFormat.Png);? I know I can add parameters and it recognizes "Width", but I have no idea how it should be formatted so visual studio would accept it.
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.IO;
using System.Drawing.Imaging;
namespace WindowsFormsApp1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
MemoryStream ms = new MemoryStream();
public string filename;
private void button1_Click(object sender, EventArgs e)
{
OpenFile();
}
private void button2_Click(object sender, EventArgs e)
{
ConvertFile();
}
private void OpenFile()
{
OpenFileDialog d = new OpenFileDialog();
if(d.ShowDialog() == DialogResult.OK)
{
filename = d.FileName;
var fs = d.OpenFile();
fs.CopyTo(ms);
}
}
private void ConvertFile()
{
using(Image img = Image.FromStream(ms))
{
img.Save(filename + ".png", ImageFormat.Png);
}
}
}
}

I suspect the problem is with how you're reading the file here:
fs.CopyTo(ms);
You're copying the content of the file into the MemoryStream, but then leaving the MemoryStream positioned at the end of the data rather than the start. You can fix that by adding:
// "Rewind" the memory stream after copying data into it, so it's ready to read.
ms.Position = 0;
You should consider what happens if you click on the buttons multiple times though... and I'd strongly advise you to use a using directive for your FileStream, as currently you're leaving it open.

Compress Audio upon writing to file

I am trying to create a recorder from audio coming out from soundcard and this is my progress so far, the problem is the recorded audio when saving to file is so large like a song can reach up to hundreds of megabyte.
here's my code
using NAudio.CoreAudioApi;
using NAudio.Wave;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Record_From_Soundcard
{
public partial class frmMain : Form
{
private WaveFileWriter writer;
private WasapiLoopbackCapture waveInSel;
public frmMain()
{
InitializeComponent();
}
private void frmMain_Load(object sender, EventArgs e)
{
MMDeviceEnumerator deviceEnum = new MMDeviceEnumerator();
MMDeviceCollection deviceCol = deviceEnum.EnumerateAudioEndPoints(DataFlow.Render, DeviceState.Active);
cboAudioDrivers.DataSource = deviceCol.ToList();
}
private void btnStopRecord_Click(object sender, EventArgs e)
{
waveInSel.StopRecording();
writer.Close();
}
private void btnStartRecord_Click(object sender, EventArgs e)
{
using (SaveFileDialog _sfd = new SaveFileDialog())
{
_sfd.Filter = "Mp3 File (*.mp3)|*.mp3";
if (_sfd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
MMDevice _device = (MMDevice)cboAudioDrivers.SelectedItem;
waveInSel = new WasapiLoopbackCapture(_device);
writer = new WaveFileWriter(_sfd.FileName, waveInSel.WaveFormat);
waveInSel.DataAvailable += (n, m) =>
{
writer.Write(m.Buffer, 0, m.BytesRecorded);
};
waveInSel.StartRecording();
}
}
}
}
}
can anyone help me on how to compress audio upon saving?
maybe it will be added on this part
waveInSel.DataAvailable += (n, m) =>
{
writer.Write(m.Buffer, 0, m.BytesRecorded);
};
Thanks in advance.. ;)

Try this using naudio dll
Using NAudio.Wave; Using NAudio.Wave.SampleProviders;Using NAudio.Lame
Private void WaveToMP3(int bitRate = 128){
String waveFileName = Application.StartupPath + #"\Temporal\mix.wav";
String mp3FileName = Application.StartupPath + #"\Grabaciones\ " + Strings.Format(DateTime.Now, "dd-MM-yyyy.HH.mm.ss") + ".mp3";
Using (var reader = New AudioFileReader(waveFileName))
{
Using (var writer = New LameMP3FileWriter(mp3FileName, reader.WaveFormat, bitRate))
{
reader.CopyTo(writer);
}
reader.Close();
}
}

You can't make an MP3 file by saving a WAV file with a .MP3 extension (which is what you are doing here). You will need to select an encoder available on your machine, and pass the audio through that. I go into some detail about how to do this with NAudio in this article.

MessageBox not showing any text in C Sharp

my message box is supposed pop up and ask the user if they want to download a new version of the application and if they say no, it exits and tells them that they need to download a new copy to continue. If they say yeah, it opens a browser to the aforementioned web address. Right now, the message box pops up and nothing appears. However, whenever I gave the code to my friend and he tried it, it worked. What's wrong here? I compiled with Microsoft Framework 4.0.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace ProjectTest
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
Form1_FormClosing();
}
private void Form1_FormClosing()
{
const string message =
"There's an updated version of this program available. Would you like to download now?";
const string caption = "Please update";
var result = MessageBox.Show(message, caption,
MessageBoxButtons.YesNo,
MessageBoxIcon.Question);
// If the no button was pressed ...
if (result == DialogResult.No)
{
MessageBox.Show("Program will close now. If you want to use this program please update to the newest version.", "Please update");
this.Close();
}
else if (result == DialogResult.Yes)
{
System.Diagnostics.Process.Start("http://www.google.com");
this.Close();
}
}
}
}

Try this:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace ProjectTest
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
this.Close();
}
private void Form1_FormClosing()
{
const string message =
"There's an updated version of this program available. Would you like to download now?";
const string caption = "Please update";
var result = MessageBox.Show(message, caption,
MessageBoxButtons.YesNo,
MessageBoxIcon.Question);
// If the no button was pressed ...
if (result == DialogResult.No)
{
MessageBox.Show("Program will close now. If you want to use this program please update to the newest version.", "Please update");
e.Cancel = false;
}
else if (result == DialogResult.Yes)
{
System.Diagnostics.Process.Start("http://www.google.com");
e.Cancel = false;
}
}
}
}