C# Discussion Boards - CodeProject

3-Apr-04 21:09

Ista wrote:
You could never get the file to be rid of the delimiters without using C++.

I just said how to do it in C#.

Ista wrote:
So in conclusion you can't create one in .NET unless you use c libraries because of the fact that when streams deserialize they leave meta data thus corrupting the file.

What leads you to this conclusion, it's absurd?

^{top secret}

Ista4-Apr-04 15:43

Ista

4-Apr-04 15:43

Well duh, a stream adds its own formatting at the end. I opted to use ansi c calls in a c++ managed dll.

So if theres an easy way in c# to write a file without creating a stream I know of none.

And besides the conclusion has no fault, seeing that you failed to point one out other than give an absurd answer.

I'm not an expert yet, but I play one at work. Yeah and here too.

leppie5-Apr-04 7:12

5-Apr-04 7:12

Ista wrote:
Well duh, a stream adds its own formatting at the end.

WTF are u talking about? End of what? Stream is a wrapper around FILE*. You are doing something wrong, and not being specific.

Ista wrote:
And besides the conclusion has no fault, seeing that you failed to point one out other than give an absurd answer.

I have been trying to help you, but you are being the stubborn one.

^{top secret}

Ista5-Apr-04 9:22

Ista

5-Apr-04 9:22

well yeah its a wrapper. But the ofstream class adds about 15 characters to the end of the file when it writes for the serialization format. Create one and look at it, its there.

Either way I created a dll that uses the FILE object to write the file and it works fine.

I'm tired of a conversation in which it keeps stepping back even after a valid answer that started off with a flippant answer and I kept it going with even worse replies.

I answered my question and I don't know of any c# function that actually wraps a FILE object using ansi c calls other than a stream which wraps ofstream which wraps FILE thereby creating metadata at the end of the file.

I appreciate your time, but this topic is deemed useless now.

I'm not an expert yet, but I play one at work. Yeah and here too.

leppie3-Apr-04 11:12

3-Apr-04 11:12

Ista wrote:
The BinaryWriter writes in unicode which is standard in .net.

Only if you tell it to. It uses UTF-8 as default.

"BinaryWriter Constructor (Stream)
Initializes a new instance of the BinaryWriter class based on the supplied stream and using UTF-8 as the encoding for strings."

Ista wrote:
I'm not an expert yet, but I play one at work. Yeah and here too.

If I was you I would hope your boss dont browse CP...

^{top secret}

Ista3-Apr-04 11:33

Ista

3-Apr-04 11:33

Yes I already know that.

I'm not an expert yet, but I play one at work. Yeah and here too.

Numeric bases types

Roger H. Art3-Apr-04 7:29

Roger H. Art

3-Apr-04 7:29

Hi.

I have troubles to change the base type of number, (from integer decimal to hexa. for example).
I have a textbox and a variable with an integer valueand I want to fill the text box with the variable's value but in hexadecimal. How could I do that?.

Thanks.

Re: Numeric bases types

leppie3-Apr-04 7:52

3-Apr-04 7:52

777.ToString("X8")

^{top secret}

Adding Recs to DB

MrJJKoolJ3-Apr-04 4:52

MrJJKoolJ

3-Apr-04 4:52

Hi all,

I am trying to add records to a Access DB. I use the following code to do this. The record gets recorded in the db's but when I read the record back from the database. All fields report nothing. Now heres the clincher. When I go to Access and do a query for that record in Access it still reports nothing even though the record is in table. Now when I cut and paste the record back into same table. wahlah its fine. Am I maybe missing some kind of commit in this code? Any ideas?

<br />
try <br />
{ <br />
    <br />
   DataSet dsHours = new DataSet(); <br />
   System.Data.DataRow drTS; <br />
   //Initialize Data Adapter and Dataset for TS Hours Table <br />
    daHours.TableMappings.Add("Table", "Hours" ); <br />
    daHours.Fill(dsHours ,"Hours"); <br />
<br />
   drTS = dsHours.Tables["Hours"].NewRow(); <br />
   drTS["TSDate"] = dtEndDate.Value; <br />
   drTS["EmployeeID"] = tbEmployeeNum.Text.ToString(); <br />
   drTS["TSMonReg"] = tbMon.Text.ToString(); <br />
   drTS["TSTuesReg"] = tbTues.Text.ToString(); <br />
   drTS["TSWedsReg"] = tbWeds.Text.ToString(); <br />
   drTS["TSThursReg"] = tbThurs.Text.ToString(); <br />
   drTS["TSFriReg"] = tbFri.Text.ToString(); <br />
   drTS["TSSatReg"] = tbSat.Text.ToString(); <br />
   drTS["TSSunReg"] = tbSun.Text.ToString(); <br />
   drTS["TSMonOT"] = tbMonOT.Text.ToString(); <br />
   dsHours.Tables["Hours"].Rows.Add(drTS); <br />
<br />
   daHours.Update(dsHours); <br />
   MessageBox.Show("Record Added Successfully !"); <br />
   bUpdateTS.Visible = true; <br />
   bAddTS.Visible = false; <br />
} <br />
   catch (OleDbException   err) <br />
{ <br />
   string errorMessage = "Message: " + err.Message + "\n" + <br />
   "Source: " + err.Source + "\n" ; <br />
   MessageBox.Show(errorMessage,"Error in DataCon"); <br />
} <br />
  catch(Exception err) <br />
{ <br />
  MessageBox.Show(err.Message,"General Error"); <br />
} <br />
<br />

This is for an insert into the Access DB. I use commandbuilder to build the insert into the Access DB. It automatically generates the insert statement for me. Is it possible to assign my own SQL Insert string to the DataAdapters InsertCommand instead? Or is the one generated by the COmmandbuilder more efficient even though it doesn't work properly? Also how can I check to see what the version is for Jet 4 oledb is? Should I use maybe ODBC connection string to the Access DB instead, maybe more reliable? What do you guys think? How can I tell if I have the latest data drivers for .net?

Thanks,
JJ

LOC Question

Brian Delahunty3-Apr-04 4:28

Brian Delahunty

3-Apr-04 4:28

Hey Lads,

Not exactly a programming question but C# related. Anybody know of a good tool for counting lines of code in a visual C# solution (with multiple projects of course)....

Regards,
Brian Dela Smile | :)

http://www.briandela.com IE 6 required.
http://www.briandela.com/pictures Now with a pictures section
http://www.briandela.com/rss/newsrss.xml RSS Feed

Heath Stewart3-Apr-04 4:34

3-Apr-04 4:34

The Project Line Counter Add-in[^] is an excellent utility and is quick, accurate, and extensible. I use it at the office to get metrics on our projects.

Microsoft MVP, Visual C#
My Articles

Nick Parker3-Apr-04 4:39

Nick Parker

3-Apr-04 4:39

I love WndTabs! Big Grin | :-D

- Nick Parker
My Blog | My Articles

Brian Delahunty3-Apr-04 4:49

Brian Delahunty

3-Apr-04 4:49

I was going to ask for a commen spell checker too but it looks like there is one there. Big Grin | :-D

Thanks Heath.

Regards,
Brian Dela Smile | :)

http://www.briandela.com IE 6 required.
http://www.briandela.com/pictures Now with a pictures section
http://www.briandela.com/rss/newsrss.xml RSS Feed

Nick Parker3-Apr-04 4:37

Nick Parker

3-Apr-04 4:37

Brian, take a look at the following article: EeekSoft Tools.Net[^].

- Nick Parker
My Blog | My Articles

multiframe gif

Stephane David3-Apr-04 1:40

Stephane David

3-Apr-04 1:40

I'm trying to maje an animation using gif.

I have several frames that I want to save inmy gif file, using the SaveAdd function.

But I cannot find anywhere example or documentation about the gif encoder.

Can someone give my an example of how to do it, or direct me to some example?

I have found only info for Tiff.

Heath Stewart3-Apr-04 4:29

3-Apr-04 4:29

All the classes involved are an abstract implementation, meaning what works for one works for another (the classes used themselves, that is). If you want to know what EncoderParameters are supported, see this simple console app that I threw together quick:

using System;
using System.Collections;
using System.Drawing;
using System.Drawing.Imaging;
using System.Reflection;

public class Test
{
  static void Main(string[] args)
  {
    string fe = "gif";
    if (args.Length > 0) fe = args[0];

    ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();
    ImageCodecInfo codec = null;
    foreach (ImageCodecInfo ci in codecs)
    {
      if (ci.FilenameExtension.ToLower().IndexOf(fe.ToLower()) >= 0)
      {
        codec = ci;
        break;
      }
    }

    if (codec == null)
    {
      Console.Error.WriteLine("No image codec found for extension " + fe);
      return;
    }

    Image img = new Bitmap(1, 1);
    EncoderParameters encparams = null;
    try
    {
      encparams = img.GetEncoderParameterList(codec.Clsid);
    }
    catch (NotImplementedException)
    {
      Console.Error.WriteLine("No encoder parameters supported for extension " + fe);
      return;
    }

    foreach (EncoderParameter encparam in encparams.Param)
    {
      string encname = GetEncoderName(encparam.Encoder.Guid);
      Console.WriteLine("{0}: {1}", encname, encparam.Type);
    }
  }

  static Hashtable encnames;
  static string GetEncoderName(Guid g)
  {
    if (encnames == null)
    {
      encnames = new Hashtable();

      Type t = typeof(Encoder);
      FieldInfo[] fields = t.GetFields(BindingFlags.Public | BindingFlags.Static);
      foreach (FieldInfo field in fields)
      {
        Encoder enc = (Encoder)field.GetValue(null);
        encnames[enc.Guid] = field.Name;
      }
    }

    return encnames[g] as string;
  }
}

If you run this, you'll see that the GIF image encoder doesn't even support any EncoderParameters, so you can just pass null.

Microsoft MVP, Visual C#
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Stephane David3-Apr-04 5:06

Stephane David

3-Apr-04 5:06

It doesn't work.

preview.Save(fileName, myImageCodecInfo, myEncoderParameters); // OK
preview.SaveAdd(frame,null); // Wrong parameters used (sorry, the exact error message is in French).

I've tried to use null for myEncoderParameters in the Save, same result

Also same result if I don't use the CodecInfo at all.

The code works with TIFF. Not with gif. Any idea?

Heath Stewart3-Apr-04 6:09

3-Apr-04 6:09

Of course passing null or a null reference results in the same problem - it's the same exact thing!

As I said before, the whole thing is pretty abstract, so you take use the concepts for the TIFF example (wherever you got that) and apply it to saving a frame with a GIF image. The documentation has more information about the EncoderParameters that are supported by GDI+. The Encoder class has several static fields with various pre-defined Encoders that you can use in the EncoderParameters. See the documentation for them in the .NET Framework SDK.

The code I posted shows that the GIF image encoder doesn't support any Encoders, so i don't know why passing null doesn't work. Google should find some examples if you use the right keywords.

Microsoft MVP, Visual C#
My Articles

Problem using Device Handle with P/Invoke methods

Stephane David3-Apr-04 7:28

Stephane David

3-Apr-04 7:28

http://www.dotnet247.com/247reference/msgs/28/140380.aspx

it seems only the TIFF encoder supports multipages...

Tristan Rhodes3-Apr-04 0:46

Tristan Rhodes

3-Apr-04 0:46

I have written the following code that is called from a component's paint method. The problem is, that nothing happens.

THe error codes returned from the drawthemebackground is 0, and the Rectangle method returns 1. Yet nothing happens.

However, when i draw something from the graphics object, retrieved from the same CreateGraphics method of the parent object, it draws ok.

			//Get Theme<br />
			pTHEME = ThemeAPI.OpenThemeData(this.Handle,"Window");<br />
<br />
			//Get Graphics Device Context<br />
			Graphics clientDC = this.Parent.CreateGraphics(); <br />
			IntPtr hdc = clientDC.GetHdc(); <br />
			pDC = ThemeAPI.CreateCompatibleDC(hdc);<br />
<br />
			//Get Location<br />
			Rectangle borderRect = new Rectangle(this.Location, this.Size);<br />
<br />
			//Build content Pane<br />
			ThemeAPI.Rect rect = new ThemeAPI.Rect();<br />
			rect.left = borderRect.Left - 20;<br />
			rect.top = borderRect.Top - 20;<br />
			rect.right = borderRect.Right + 20;<br />
			rect.bottom = borderRect.Bottom + 20;<br />
<br />
			//Build content Pane<br />
			ThemeAPI.Rect clipRect = new ThemeAPI.Rect();<br />
			rect.left = 0;<br />
			rect.top = 0;<br />
			rect.right = 0;<br />
			rect.bottom = 0;<br />
<br />
			int result;<br />
			int state = 1;<br />
			//Draw Background  THIS DOES NOT DRAW<br />
			for (int part=0; part<20; part++)<br />
			{<br />
				result = ThemeAPI.DrawThemeBackground(pTHEME,hdc,part,state,ref rect,ref clipRect);<br />
			}<br />
			<br />
			//Draw rectangle<br />
			result = ThemeAPI.Rectangle(pDC, borderRect.Left-5,<br />
				borderRect.Top-5, borderRect.Right+5, borderRect.Bottom+5);<br />
			//END DOES NOT DRAW<br />
<br />
			<br />
			//THIS DRAWS<br />
			Graphics clientDC2 = this.Parent.CreateGraphics();<br />
			Pen RedPen = new Pen(Color.Red, 10);<br />
			clientDC2.DrawRectangle(RedPen,borderRect);<br />
			Pen GreenPen = new Pen(Color.Green, 5);<br />
			clientDC2.DrawEllipse(GreenPen,borderRect);<br />
			clientDC2.Dispose();<br />
			//END THIS DRAWS<br />
<br />
			//Cleanup<br />
			clientDC.ReleaseHdc(hdc);

Can anyone tell me why it does not like my device handle? I've tried creating a compatible version, but it still does nothing.

I've followed the instructions to the letter, so i'm baffled. If anyone has any thoughts, they would be appreciated.

Cheers

Cata

Re: Problem using Device Handle with P/Invoke methods

Heath Stewart3-Apr-04 3:33

Re: Problem using Device Handle with P/Invoke methods

3-Apr-04 3:33

Why are you creating a Graphics object from the parent? Each control when painted has its own device context, so you're actually trying to paint in the parent's device context which probably wouldn't do anything. Get the HDC from the Graphics object in the PaintEventArgs passed to you in OnPaint (or the Paint event if not in a derivative class).

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Tristan Rhodes3-Apr-04 4:14

Tristan Rhodes

3-Apr-04 4:14

I know the parents device context works. I can draw stuff with it. Just not with P/Invoke.

I've tried using the controls getgraphics, and the event graphics to generate a DC, but the only one that works is the parents.

I've experimented painting with the parents device context. And that works ok for non P/Invoke methods like drawing rectangles.

I can't seem to draw inside the control at all. I've made it, and all it's components transparent as well, to see what happened, and still got nothing.

Re: Problem using Device Handle with P/Invoke methods

Heath Stewart3-Apr-04 4:32

Re: Problem using Device Handle with P/Invoke methods

3-Apr-04 4:32

When you use the Graphics object from any control, it will work, yes. This is because you're using GDI+. When you start painting with device contexts (which is NOT the same as a Graphics object!), things work a bit differently because you're using the older GDI library. You can read more about these in the Platform SDK.

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leppie3-Apr-04 6:35