Quote backslash in C# with open file dialog

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I'm making a really simple audio player

There is a button which opens an OpenFileDialog to select an MP3 fileto input into a listBox, which works fine, but when I try to play an audio file in the list using this code on a button:

C#

SoundPlayer sound = new SoundPlayer(listBox1.SelectedIndex.ToString());
sound.Play();

I get an error saying there is not a file in that place, so I think it's because the backslash has to be \\ instead of \ in the Soundplayer, but the FileName from openFileDialog only uses \ because that's how it is in windows explorer.
I tried to string.replace \ with \\ but did not work it still complained (I even tried replace \\ with \\ to stop the exit thing it does)

Basically all I need is:

A way to make a button play a sound file by getting the name from a listbox

If I am unclear please ask me to rephrase, I am learning still so try explain as simple as possible.
Thank you!

Posted 26-Jan-12 10:35am

Joel Whatley-

Updated 26-Jan-12 14:11pm

fjdiewornncalwe

v3

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Sergey Alexandrovich Kryukov · Accepted Answer · 2012-01-26T10:42:00

Solution 1

In the data fields like the text box or a file dialog, all path names are read as is, with not backslash escaping or other foolishness. Such escaping is only needed in source code string literals, due to C, C++ or C# syntax.

However, in the past I saw a lot of really brain-damage C and C++ software where such escapes present even in raw data. You should not see anything like that in .NET applications, unless… idiocy is hard to cure, you know. :-)
You code is not the case anyway, it looks like.

The reason of your problem is somewhere else. If you still did not find out, you can run it under debugger or reproduce the problem on a really short code sample which you can post here (using "Improve question" above).

—SA

Posted 26-Jan-12 10:42am

Sergey Alexandrovich Kryukov

Updated 26-Jan-12 10:44am

v3

Comments

Joel Whatley- 26-Jan-12 16:45pm

Oke =) thanks, but can you help me with making it work?
I'm really new to programming so I don't really understand properly with why it's giving an error.

This is a button to use the OpenFileDialog:
ofd.Filter = "mp3 Files (*.mp3)|*.mp3";
if (ofd.ShowDialog() == System.Windows.Forms.DialogResult.OK && ofd.FileName.Length > 0)
{
string name = ofd.FileName;
listBox1.Items.Add(name);
}

then how is it possible (using a button) to play that file with SoundPlayer?

For example the listBox will have the filename as C:\User\Joel\Music\song.mp3

Please help =)

Sergey Alexandrovich Kryukov 26-Jan-12 21:01pm

Did you first try to play with newSoundPlayer(name), where the name is your variable above? Without the list box in the middle, where you make a mistake pointed out by Marcus?

After all, I told you do use Debugger? Did you do it? This is the first thing you should do in the case of the smallest doubt about your run-time.
--SA

Joel Whatley- 26-Jan-12 16:52pm

Apparently this doesn't work

SoundPlayer sound = new SoundPlayer(listBox1.SelectedIndex.ToString());
sound.Play();

Sergey Alexandrovich Kryukov 26-Jan-12 21:01pm

Sigh...

Joel Whatley- 26-Jan-12 17:12pm

Ok I did what you said, and it works when I read it from a label:
string name;

label3.Text = name;
SoundPlayer sound = new SoundPlayer(name);
sound.Play();

now it works, but not with the listBox1.SelectedIndex.ToString() way, how come?

fjdiewornncalwe 26-Jan-12 20:13pm

The selected Index is not the value you want to use. What you really want to use is listBox1.Items[listBox1.SelectedIndex].ToString()

Sergey Alexandrovich Kryukov 26-Jan-12 20:58pm

Exactly!
--SA

Sergey Alexandrovich Kryukov 26-Jan-12 21:04pm

Do you understand it? listBox1.SelectedIndex.ToString() is something like "0", "1", "2", etc.?!! How can it be a file name?

And do one thing. Rename all variables like "listBox1" to something semantic. Never allow yourself the names with numeric. Name it like "listBoxFileNames" or something. Refactor => Rename...
--SA

Joel Whatley- 27-Jan-12 14:24pm

Ok SA :) Thank you all, I will give it a try!

Rahul Kumar Ghosh 29-Apr-13 18:38pm

how can i remove double \\ and make it single \ in the code, because in the textbox it's not showing double \\ it's showing single \, but within the code using breakpoint i saw it is double \\
My code --
OpenFileDialog openFileDialog1 = new OpenFileDialog();
openFileDialog1.InitialDirectory = "C:\\Program Files\\Microsoft SQL Server\\MSSQL10_50.MSSQLSERVER\\MSSQL";
openFileDialog1.Filter = "Database files (*.mdf)|*.mdf";
openFileDialog1.FilterIndex = 2;
openFileDialog1.RestoreDirectory = true;

if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
string file = openFileDialog1.FileName.Replace("\\" , @"\");
txtFileName.Text = file;

Sergey Alexandrovich Kryukov 29-Apr-13 18:42pm

What's unclear? In the string literal "C:\\Program Files\\Microsoft SQL Server\\MSSQL10_50.MSSQLSERVER\\MSSQL", '\\' is a SINLGE '\' character.
You should not replace anything.
—SA