XP Style problem - C# Discussion Boards

27-Dec-04 10:12

How were you doing it before? C# does not support functions - only methods. They would've had to have been members of a class before or else you couldn't have even compiled your source file.

BTW - those last two parameters are process-dependent types and should be IntPtr. If you're needing to pass pointers to structs or char arrays (strings), you can define overloads that would amount to a pointer, such as simply string or ref MyStruct. int is an Int32 in C# and will always be 32 bits. If you ever hope to port this - whether the source or binary - you'll need to change it anyway.

External methods must always be static, too, but you declared them statically before, did you not?

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Re: SendMessage issue

Aviv Halperin27-Dec-04 20:41

Aviv Halperin

27-Dec-04 20:41

They were static members of the my TextBoxEx class before.
All I did was build a new class and pass the methods to be static members of the new class. then call them as the new class methods.
e.g. if my old class was Aclass and the new Bclass then in Aclass I call:
Bclass.SendMessage(...);

I have a few overloads such as
[DllImport("coredll")]
public static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wParam, String lParam);
[DllImport("coredll")]
public static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wParam, byte[] lParam);

that take addresses (pointers). I only use :
[DllImport("coredll")]
public static extern IntPtr SendMessage(IntPtr hWnd, int msg, int wParam, int lParam);
to call with 0 lparam and wparam thus:
Bclass.SendMessage(this.Handle, (int)ClipboardMessage.WM_UNDO, 0, 0);

I probably should use 2 pointers (IntPtr) instead and lock the IntPtr for the GC before calling this method?

Thanks,
Aviv.

avivhal

Re: SendMessage issue

Heath Stewart28-Dec-04 5:01

Printing RichText text and image

28-Dec-04 5:01

On what class they're defined shouldn't matter, but perhaps some of your overloads were conflicting.

With value types - like int - you do not need to pin them (see the GCHandle class, BTW). Reference types may be moved by the GC on the heap, but it depends how the message handler uses the data; you may not need to pin the memory. Strings are reference types but this data is typically used synchronously with SendMessage (PostMessage, on the other hand, is a different story). When passing addresses of reference objects (as IntPtr, or just a GCHandle which works, too, as well as a HandleRef) you should pin them.

For robust code, never use fixed-size integers for the WPARAM and LPARAM. Always use IntPtr. For 0, just use IntPtr.Zero and to wrap an int or long use new IntPtr(int) or new IntPtr(long), respectively.

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srunion23-Dec-04 9:53

srunion

23-Dec-04 9:53

Can anyone tell me how to print text and images within a rich text box?

Thanks,
Sterling

Re: Printing RichText text and image

Jay Shankar23-Dec-04 14:20

Jay Shankar

23-Dec-04 14:20

Below link has the details:

How To Print the Content of a RichTextBox Control By Using Visual C# .NET[^]

.NET CF and SendMessage

Aviv Halperin23-Dec-04 9:18

Aviv Halperin

23-Dec-04 9:18

I'm trying to use p/invoke in the .NET CF in order to create copy,paste and other operations.
I use the following code:

[DllImport("coredll.dll")]
internal extern static int SendMessage(IntPtr Hwnd, int Msg, int WParam, int LParam);
SendMessage(this.hwnd, (int)ClipboardMessage.WM_CUT, 0, 0);

I noticed that the desired operation never happens! All other p/invoke I use work fine. Only the SendMessage does not work (I tried many other like WM_CHAR,WM_VSCROLL and more, nothing works)

Thanks.

avivhal

XP Style problem

Stanciu Vlad23-Dec-04 8:31

Stanciu Vlad

23-Dec-04 8:31

I have enabled the xp styles for a windows application with Application.EnableVisualStyles() and seted to all the controls that have a FlatStyle property to FlatStyle.System.
The problem apears at a CheckedListBox, the CheckBox'es that it contains doesn't take the style and it doesn't have a FlatStyle property. I didn't manage to find a property for the items (CheckBox'es) that it contains, all I've found was a string that represented an item (a string item).
Can anybody help me?

I hope you understand...
By the way... visit http://nehe.gamedev.net[^]

Re: XP Style problem

Heath Stewart23-Dec-04 9:08

23-Dec-04 9:08

The CheckedListBox does use the ComboBox control - it draws checkboxes using ControlPaint.DrawCheckBox, which doesn't take advantage of the Theme API.

To accomplish what you want you'll have to extend the CheckedListBox and override OnDrawItem, using the DrawItemEventArgs.Graphics to get an HDC (handle to a device context), draw the checkbox you want using the Theme API, then release the HDC:

public XPCheckedListBox : CheckedListBox
{
  // ...
  protected override void OnDrawItem(DrawItemEventArgs e)
  {
    IntPtr hdc = e.Graphics.GetHdc();
    // Draw checkbox.
    e.Graphics.ReleaseHdc(hdc);
    // Do NOT call base.OnDrawItem
  }
}

To draw a themed checkbox you'll need to P/Invoke the Theme APIs, which you can read about at http://msdn.microsoft.com/library/en-us/shellcc/platform/commctls/userex/refentry.asp[^]. For help with P/Invoke signatures, see http://pinvoke.net[^].

Be sure to read about the Theme API because it's not a simple set of APIs.

Also note that in .NET 2.0 themes should be (it's still beta, so nothing's set in stone till release) encapsulates. For documentation about these set of classes in .NET 2.0 Beta1, see http://msdn2.microsoft.com/library/System.Windows.Forms.VisualStyles.aspx[^].

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Spellcheck in C#.NET

saptarishi200123-Dec-04 8:26

saptarishi2001

23-Dec-04 8:26

I am trying to write a spellcheck application in C#.NET, that will utilize ASPELL to detect, whether the text entered in a textbox is valid or not. I don't want to use word.dll because that means the user has to have Microsoft word installed in his/her machine. There is one such project over here, but I don't really understand how it works. Is there a simple way to do this? Somebody suggested integrating ASPELL to my code, but I have no idea how to do that. Can somebody help me out?

Regex problem

Yaakov Davis23-Dec-04 7:09

Yaakov Davis

23-Dec-04 7:09

I need that Regex won't return match if the string starts with another substring, for example "abc".

In detail, "abcde" shouldn't match, but "abg", "gbc" and "afcgr" should match.

I know the [^abcde] syntax that works for characters, but I couldn't figure out way for substrings.

It is possible to do this with Regex?

I need it to be done through Regex, not String class methods.

Thanks.

leppie23-Dec-04 7:41

23-Dec-04 7:41

Use explicit capture and the following:

(abc.*)|(?<good>a.*)

You can use backtracking too, but i dont really understand it, the above way does the same, kinda :p

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Download xacc-ide 0.0.3 now!
See some screenshots}

Yaakov Davis23-Dec-04 7:56

Yaakov Davis

23-Dec-04 7:56

I think you missed the point.

"abc" should not match.

I want to match any combination of three characters, except the above sequence.

I can do it as well with two chars. For example, if i want to match anything except "ab", i can use (?:a[^b])|(?:[^a].).

But when it comes to three or more characters, i find no way. Maybe I miss something.

Thanks.

TyronX23-Dec-04 8:09

TyronX

23-Dec-04 8:09

"[^(abcd)]+" seems to be working
a better way would be: "^(?!abcd).+"

(I'm not sure if (?!x) is a valid expression in the C# Regexes)

leppie23-Dec-04 8:10

23-Dec-04 8:10

sb777 wrote:
Maybe I miss something.

Perhaps Smile | :)

It is infact matched just not returned, well at least not as a named group. Al you have to do is check is Groups["good"].Success. As long as your precedence is correct, you can match and 'eleminate' alot of data at once.

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Download xacc-ide 0.0.3 now!
See some screenshots}

Question about efficiency - Hashtable key types

Yaakov Davis23-Dec-04 8:50

Yaakov Davis

23-Dec-04 8:50

TyronX,

yous second suggestion did answered my question. thanks a lot. BTW, the first one isn't correct.

leppie,
Your suggestion could also fit in another constraints, but thanks for the new information.

Tristan Rhodes23-Dec-04 6:28

Tristan Rhodes

23-Dec-04 6:28

I'm making a class to manage textures, and i have them stored in a hashtable. Now I have two possible objects I could use as a key, a texturedata object that describes the texture, or a compressed string format dataobject (like a Key or an ID string).

Would a hash table lookup a string quicker than an object?

Cheers guys.

Cata

Re: Question about efficiency - Hashtable key types

leppie23-Dec-04 7:42

Re: Question about efficiency - Hashtable key types

23-Dec-04 7:42

It depends on the speed of the hash function, normally you wont notice it though :p

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See some screenshots}

Tristan Rhodes23-Dec-04 9:57

Tristan Rhodes

23-Dec-04 9:57

Ok, that's cool. Now another question. Smile | :)

What would take up more space in memory overall? A class with 5-6 parameters, say a short string, few ints, and enumerations. Or a single string of say 40 charachters?

I'm assuming that i will have a few hundred objects with these values in them, so i'd like to make it efficient for space. If i remember correctly, a string is a value type, so it will take up space for each instance of itself. Now, if 100 objects have this string key, it will be 100x the string value. But if I use an object, they are handled as refference type, and only 1 exists, but many objects would have access to it.

Am I right? Would an object form be less expensive for memory?
On the other hand, some of these objects may only be used once, and therefore could benefit from the smaller space that the string would be.
Of course, I could always go with pointers to strings... but it could be a headache.

what do you think?

Cheers

Cata

Re: Question about efficiency - Hashtable key types

Matt Gerrans23-Dec-04 11:47

Matt Gerrans

23-Dec-04 11:47

Is this for an embedded system? Otherwise quibbling about the overhead for a few hundred objects seems pretty silly.

Anyway, since you didn't say how long the "short string" is, there's no way to guess.

As far as the value type stuff goes, there can be many references to one string. In fact, many identical string literals in your code will all result in the same string in a "constant pool" that is shared (that is, all the places where it is used in your code will instead have a reference to that one constant string instance).

> Now, if 100 objects have this string key, it will be 100x the string value.
No, that's not correct. Of course, there is an exception and it depends on how the references are created. If you create a hundred of these:

class MemHawg
{
   string name;
   public MemHawg( string name )
   {
       this.name = new string( name );
   }
}

Then it will take more memory than this would:

class MemMiser
{
   string name;
   public MemMiser( string name )
   {
       this.name = name;
   }
}

The first one makes a (somewhat useless) copy of the the string passed in, while the second one just has a reference to the one string. So in the second case, you'll have 100 objects that all refer to the same one string.

Of course, the latter implementation makes more sense, since there isn't much sense in duplicating immutable objects.

Matt Gerrans

how to get mirror printing using c#

bigmega23-Dec-04 5:32

bigmega

23-Dec-04 5:32

Hellos friends ,I need that my printer print my document in mirror,I want manipulate this from c#,anyone help me.
Regards bigmega

Re: how to get mirror printing using c#

Heath Stewart23-Dec-04 8:16

Windows Installer Problem

23-Dec-04 8:16

In your even thandler for the PrintDocument.PrintPage event (or override of OnPrintPage if extending PrintDocument, which is usually a good idea for encapsulation) you need to apply a transformation matrix to the Graphics object by assigning the identity matrix to the Graphics.Transform property (the world transform) with either M11 or M22 negated to flip on the y-axis or x-axis, respectively.

For example:

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
 
class FlipExample : Form
{
  static void Main()
  {
    Application.Run(new FlipExample());
  }
 
  RectangleF left;
  RectangleF right;
  PointF[] triangle;
  StringFormat format;
  Matrix flipTransform;
 
  FlipExample()
  {
    Text = "Flip Example";
    SetStyle(ControlStyles.AllPaintingInWmPaint |
      ControlStyles.DoubleBuffer | ControlStyles.ResizeRedraw |
      ControlStyles.UserPaint, true);
 
    format = StringFormat.GenericDefault;
    format.Alignment = StringAlignment.Center;
 
    OnResize(EventArgs.Empty);
  }
 
  void DrawCaption(Graphics g, RectangleF r, string caption)
  {
    g.DrawString(caption, Font, SystemBrushes.ControlText,
      r, format);
  }
 
  void DrawTriangle(Graphics g, RectangleF r, bool flip)
  {
    if (flip)
    {
      g.Transform = flipTransform;
      g.TranslateTransform(r.X, 0f, MatrixOrder.Append);
    }
    else
    {
      // Reset to the identity transform.
      g.ResetTransform();
    }
 
    g.FillPolygon(SystemBrushes.ControlText, triangle);
  }
 
  protected override void OnPaint(PaintEventArgs e)
  {
    base.OnPaint(e);
 
    Graphics g = e.Graphics;
 
    DrawCaption(g, left, "Normal");
    DrawCaption(g, right, "Flipped and Translated");
 
    DrawTriangle(g, left, false);
    DrawTriangle(g, right, true);
  }
 
  protected override void OnResize(EventArgs e)
  {
    float halfWidth = Width / 2f;
    float halfFont = Font.Height / 2f;
 
    left = new RectangleF(0f, 0f, halfWidth, (float)Height);
    right = new RectangleF(halfWidth, 0f, halfWidth, (float)Height);
 
    // Negate M11 to rotate along the y-axis.
    flipTransform = new Matrix(-1,0,0,1,halfWidth,0);
 
    triangle = new PointF[] {
      new PointF(halfWidth, halfFont),
      new PointF(halfWidth, (float)Height
        - SystemInformation.CaptionHeight - halfFont * 2f),
      new PointF(0f, Height / 2f)};
 
    base.OnResize(e);
  }
}

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Asad Hussain23-Dec-04 5:13

Asad Hussain

23-Dec-04 5:13

I am trying to make windows installer uninstall the old version and install a new version upon a new release. I found a property RemovePreviousVersions and set it to true.

Accorting to documentation UpgradeCode must not change and ProductCode must be difference. After the install, I go to the Add/Remove programs and see both versions on the list. Is there something that I'm missing?

Re: Windows Installer Problem

Heath Stewart23-Dec-04 5:19

Re: Windows Installer Problem

23-Dec-04 5:19

Asad Hussain wrote:
Accorting to documentation UpgradeCode must not change and ProductCode must be difference.

That is correct. So is it? To easily find out, download the MSI SDK from http://msdn.microsoft.com/platformsdk[^] which installs Orca.msi into the Platform SDK's Bin directory. Then install that. You can open the MSI packages in Orca. Find the Property table and make sure that for both packages the UpgradeCode property value is the same.

For major installs, you must also change the major version number. Minor installs only change the minor version number. For changes to the build(third) number, the ProductCode should not change. Read Patching and Upgrades[^] in the MSI SDK documentation for more information about package versioning rules.

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leppie23-Dec-04 7:49