Re: Programmatically Deleting Data from a File - C# Discussion Boards

15-Sep-05 10:13

*edit* Woops, just looked it up, it's a native .NET library. Cool Cool | :cool:

. So just add a reference to Microsoft.MediaCenter.dll in your Visual Studio project, then go something like:

using Microsoft.MediaCenter.Extensibility;
...

// get the audio mixer. See <a href = "http://msdn.microsoft.com/library/default.asp?url=/library/en-us/MedctrSDK/htm/addinhostaudiomixerproperty.asp" rel="nofollow">this page for more info</a>[<a href = "http://msdn.microsoft.com/library/default.asp?url=/library/en-us/MedctrSDK/htm/addinhostaudiomixerproperty.asp" target = "_blank" rel="nofollow">^</a>]
AudioMixer mixer = AddInHost.AudioMixer;

// get the property
bool isMuted = mixer.Muted;

// set the property
mixer.Muted = true;

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Re: short/easy question

Lapje15-Sep-05 23:31

Lapje

15-Sep-05 23:31

This code does not work Cry | :((

Keep in mind the AudioMixer is an interface, not a class.

Re: short/easy question

Judah Gabriel Himango16-Sep-05 5:16

Programmatically Deleting Data from a File

16-Sep-05 5:16

Ok, you didn't ask how to get the AudioMixer, so I assumed you already knew. The article I linked to has some examples; I don't know offhand because it's a 3rd party extension that I've never used before. I suggest you create another post if you need help creating the AudioMixer.

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JMitchem15-Sep-05 7:37

JMitchem

15-Sep-05 7:37

I am trying to find a way to remove data from a file using C#.

I know how to edit using FileStream.Seek and a StreamWriter, and I know how to append data to the end, but I haven't found a way to actually remove data from the end of a file.

Due to file size and memory constraints, reading the whole thing in, saving it as a new file, and then deleting the old file is not an option.

Is there a way to write an EOF where I specify, and that's that? (if so, how do you actually do that?) Or do I have to go about doing this some other way?

Thanks in advance for the help,

Jonathan Mitchem

Re: Programmatically Deleting Data from a File

Judah Gabriel Himango15-Sep-05 10:22

Re: Programmatically Deleting Data from a File

15-Sep-05 10:22

No matter what you do, you'll have to get the file stream. This is standard. You can Seek to a position (or .Position) the position of the stream, write data to it, then save it, overritting the previous file. That's probably your best bet.

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JMitchem15-Sep-05 12:10

JMitchem

15-Sep-05 12:10

Thanks.

This issue has now been resolved.

http://www.gotdotnet.com/Community/MessageBoard/Thread.aspx?id=340164&Page=1#340199

Re: Programmatically Deleting Data from a File

Guffa15-Sep-05 11:44

Guffa

15-Sep-05 11:44

Use the SetLength method of the FileStream class.

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Designer calls to class constructor several times!

Lexa198315-Sep-05 7:03

Re: Designer calls to class constructor several times!

15-Sep-05 7:03

I have a control inherited from ComboBox. In constructor I add some items. Now, when my control is have been putted onto form designed calls to constructor and item collection is automatically updates. How can I prevent this action, some directive or attribute that tells to designer not to call to constructor during the design time?

Judah Gabriel Himango15-Sep-05 7:30

Re: Designer calls to class constructor several times!

15-Sep-05 7:30

Please see this page[^] for information about how to write design-time aware code.

Also, the designer will always call the default constructor (i.e. the constructor that takes zero parameters). If you want to create a constructor that gets called only by your code, create a second constructor that takes a parameter.

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-- modified at 13:30 Thursday 15th September, 2005

Lexa198315-Sep-05 8:19

Re: Designer calls to class constructor several times!

15-Sep-05 8:19

There is a lot of information there... unfortunately I have not found what I need, but thanks.
Declare additional constructor with different from void parameters will be not so "right" way. It must be something that resolves this problem...

Judah Gabriel Himango15-Sep-05 10:07

Re: Designer calls to class constructor several times!

15-Sep-05 10:07

If your control inherits from System.ComponentModel.Component (or System.Control, which inherits from System.ComponentModel.Component), then you can get the value from the protected DesignMode property to indicate whether you're in design mode.

public class MyControl : Control
{
   public MyControl()
   {
      // in design mode?
      bool designMode = this.DesignMode;
   }
}

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Judah Himango

Lexa198315-Sep-05 11:21

Put part of a gif file into imagebox?

15-Sep-05 11:21

thanks

that is exactly what I need

Seraphin15-Sep-05 6:58

Seraphin

15-Sep-05 6:58

I have a gif file with 3 pictures, next to next in one image. Seperated by black lines.

Each picture has a width of 100pix, the black seperation line has 2 pix. Max width is 306.

Now I want to copy the first picture into the imagebox. How can I copy the first picture into the imagebox?
I never have worked with sprites, so I don't know how to get this.

Lexa198315-Sep-05 7:09

15-Sep-05 7:09

It's seems that your problem is to separate one peace of entire image from other. If there is width of each peace is constant it will be very easy, but if not, you need to "search for black line"...
What exactly you want to know?

Seraphin15-Sep-05 7:21

Seraphin

15-Sep-05 7:21

I know exactly the positions.

1st 1-300
2nd 303-603
3rd 606-906

no dynamic problem, all pictures positions are placed logical, like sprites.

Lexa198315-Sep-05 8:10

15-Sep-05 8:10

there is your code, I believe it works Smile | :)

<br />
//load needed image from file<br />
Image src = Image.FromFile(/*your image file name*/);<br />
<br />
Graphics gr = Graphics.FromImage(src);<br />
<br />
Point point = new Point(1, 0);<br />
<br />
for (int i=0; i<3; i++)<br />
{<br />
	//handles the pixels of separated image<br />
	Bitmap bitmap = new Bitmap(300, /*your image height*/, gr);<br />
			<br />
	//draw the needed part of entire image<br />
	gr.DrawImageUnscaled(src, point);<br />
<br />
	//make offset to next part<br />
	point.Offset(303, 0);<br />
<br />
	//save the destination image<br />
	bitmap.Save("filename.bmp", System.Drawing.Imaging.ImageFormat.Bmp);<br />
}<br />