I am currently trying to make my mp3 player for a project.
I have written this code by following a guide:
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;
namespace WindowsFormsApplication2
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
string[] files, path;
[STAThread]
private void button1_Click(object sender, EventArgs e)
{
if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
files = openFileDialog1.SafeFileNames;
path = openFileDialog1.FileNames;
for (int i = 0; i < files.Length; i++)
{
listBox1.Items.Add(files[i]);
}
}
}
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
axWindowsMediaPlayer1.URL = path[listBox1.SelectedIndex];
}
}
}
And heres a screen of my form:
For some reason when I click the OPEN button, nothing happens. First when I used this code I got an error about "Form1_load", but since I wasn't using this, I just deleted the error line and then there was no errors found.
I am very clueless, so anyone with ANY idea what is wrong?
I followed this guide completely:
http://www.c-sharpcorner.com/UploadFile/8ea152/mp3-media-player-in-C-Sharp-4-0/
Thanks
First of all make sure that you have assigned click event for your button for that just double click on your button from design window if it redirects you to the buttonclick method then everything is fine and if it does not then assign it first. For that
public Form1()
{
InitializeComponent();
button1.Click += button1_Click;
}
And
Why do you require [STAThread] here? I mean just remove the attribute and try again because [STAThread] is used for below reson:-
The STAThreadAttribute marks a thread to use the Single-Threaded COM
Apartment if COM is needed. By default, .NET won't initialize COM at
all. It's only when COM is needed, like when a COM object or COM
Control is created or when drag 'n' drop is needed, that COM is
initialized. When that happens, .NET calls the underlying
CoInitializeEx function, which takes a flag indicating whether to join
the thread to a multi-threaded or single-threaded apartment.
For more information :-
http://blogs.msdn.com/b/jfoscoding/archive/2005/04/07/406341.aspx
Related
This question already has answers here:
Process.Start to open an URL, getting an Exception?
(4 answers)
Closed 1 year ago.
I am very interested in C# winforms. I decided to make it open a browser window once I click on a link label with the default browser. I searched on the internet and found the following 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;
namespace GUI
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void panel1_Paint(object sender, PaintEventArgs e)
{
}
private void linkLabel1_LinkClicked(object sender, System.Windows.Forms.LinkLabelLinkClickedEventArgs e)
{
try
{
VisitLink();
}
catch (Exception ex)
{
MessageBox.Show("Unable to open link that was clicked.");
}
}
private void VisitLink()
{
// Change the color of the link text by setting LinkVisited
// to true.
linkLabel1.LinkVisited = true;
//Call the Process.Start method to open the default browser
//with a URL:
System.Diagnostics.Process.Start("http://www.microsoft.com");
}
}
}
When I tried it in my code, I clicked on the link but nothing shows up. Not even an exception pops up, which made me confused. Can anyone help me? Thanks!
The link is correctly marked as visited after the click ? If not, the event is probably not even got fired. Check if you correctly add the callback on the click event
Just recently began tinkering with Awesomium, it's very cool and much better than the stock webBrowser for WinForms.
However, when I use the _LoadingFrameComplete method to determine if the page has loaded, it seems to be firing 10+ times (when used on Facebook, 2 times when navigating to google.com)
I am trying to get the comparable method of webBrowser1_DocumentCompleted (which only fires one time, after the document has completed).
Is this a 'me' problem, or am I using the wrong methods to check whether the website has finished loading completely.
I'm using Visual C# 2010 Edition
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 Debugging_Problems
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
string searchURL = textBox1.Text;
webControl1.Source = new Uri(searchURL);
}
private void Awesomium_Windows_Forms_WebControl_LoadingFrameComplete(object sender, Awesomium.Core.FrameEventArgs e)
{
richTextBox1.AppendText("Completed.\n");
}
}
}
You need to use IsMainFrame
private void Awesomium_Windows_Forms_WebControl_LoadingFrameComplete(object sender, Awesomium.Core.FrameEventArgs e)
{
if (e.IsMainFrame)
{
richTextBox1.AppendText("Completed.\n");
}
}
Try putting if(e.IsMainFrame) { .... } inside your LoadingFrameComplete event handler and only put your code in there. – Jon
That was the answer. Thank you.
link to original code - please look at it first.
I'm not sure how to write this code so that it runs properly. So far my attempt:
The code in the website is using System Speech Recognition from Microsoft to record audio from microphone and turn it into text. Except, I don't know how to format that code on the website properly. The below certainly does not work. I get red underlines everywhere. I'm also not sure how 'event-handler' code is supposed to look like.
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;
using System.Speech.Recognition;
namespace SystemSpeechRecognition_winForms
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button2_Click(object sender, EventArgs e)
{
SpeechRecognitionEngine _speechRecognitionEngine = new SpeechRecognitionEngine();
_speechRecognitionEngine.SetInputToDefaultAudioDevice();
DictationGrammar _dictationGrammar = new DictationGrammar();
_speechRecognitionEngine.LoadGrammar(_dictationGrammar);
_speechRecognitionEngine.RecognizeAsync(RecognizeMode.Multiple);
ERROR for the four lines
This is the error:
.
"delegate System.EventHandler"
"Represents the method that will handle an event that has no event data"
"Error: No overload for 'SpeechRecognized' matches delegate 'System.EventHanndler'
_speechRecognitionEngine.SpeechRecognized -= new EventHandler(SpeechRecognized);
_speechRecognitionEngine.SpeechHypothesized -= new EventHandler(SpeechHypothesizing);
_speechRecognitionEngine.SpeechRecognized += new EventHandler(SpeechRecognized);
_speechRecognitionEngine.SpeechHypothesized += new EventHandler(SpeechHypothesizing);
}
private void SpeechHypothesizing(object sender, SpeechHypothesizedEventArgs e)
{
///real-time results from the engine
string realTimeResults = e.Result.Text;
}
private void SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
{
///final answer from the engine
string finalAnswer = e.Result.Text;
}
}
You're having compilation issues because - to take one of the events as an example - the SpeechRecognized event is of type EventHandler<SpeechRecognizedEventArgs> and you are attempting to assign it an instance of the non-generic EventHandler class.
_speechRecognitionEngine.SpeechRecognized -= new EventHandler<SpeechRecognizedEventArgs>(SpeechRecognized);
I would like to check the state of the Insert key in a C# Windows Form application. Here is minimal code (which does not work; form with two RadioButtons):
using System;
using System.Windows.Forms;
using System.Windows.Input;
// Also added PresentationCore and WindowsBase refereneces
namespace InsertModeDemo1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
if (Keyboard.IsKeyToggled(Key.Insert))
radioButtonInsert.Checked = true;
else
radioButtonOverstrike.Checked = true;
}
}
}
Try using Control.IsKeyLocked instead.
private void Form1_Load(object sender, EventArgs e)
{
if (Control.IsKeyLocked(Keys.Insert))
radioButtonInsert.Checked = true;
else
radioButtonOverstrike.Checked = true;
}
References: Control.IsKeyLocked
Note
The documentation says the method only works with CAPS LOCK, NUM LOCK, or SCROLL LOCK key only. But testing the method with Keys.Insert has proven that it also work for INSERT key.
You have two options:
Listen to key change events, meaning, you'll need to keep track on the status yourself according to when the button is pressed.
Using win32 interop, take a look here for example.
New to C# from vb.net and I am just making some mock bound applications for now. I have problems with the following code. If I pic an image and exit the application, there is no change. Even if I move a row. However if I upload an image, move to another row, then add another image. After exiting the application the first image will be there but not the second.
In short I have to attempt to upload to another record before the record I actually want updating will do so.
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;
using System.IO;
namespace DBUserManagement
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
// TODO: This line of code loads data into the 'dsUsers.Users' table. You can move, or remove it, as needed.
this.usersTableAdapter.Fill(this.dsUsers.Users);
}
private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
{
OpenFileDialog ofd = new OpenFileDialog();
if (DialogResult.OK == ofd.ShowDialog())
{
imgUser.SizeMode = PictureBoxSizeMode.StretchImage;
imgUser.Image = new Bitmap(ofd.OpenFile());
//update bound field.
usersTableAdapter.Update(dsUsers);
}
}
}
}
Any ideas on what I am missing or not understand correctly? Any help appreciated.
/P
The answer was I needed to call the BindingSource's .EndEdit(); method.
So I am guessing it was down to the binding source still having hold of something.
Seems like I'm on the right track anyhow, I looked up the details on MSDN :)