Re: IDocHostUIHandler, FilterDataObject - C# Discussion Boards

IDocHostUIHandler, FilterDataObject

3-Feb-04 5:56

Actually, regasm.exe only registers the assembly. You need uuidgen.exe or a plethora of alternative programs / extensions. You're right about where to generate a new GUID from VS.NET, though.

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s.keller2-Feb-04 9:05

2-Feb-04 9:05

Hi there,

I'm currently working on a MSHTML Interface. The implementation of the IDocHostUIHandler and also the editing in general work quiet well for me. The only problem I got is the FilterDataObject method. I can't suppress any data-actions although the method is invoked.

Has anyone a working example of the FilterDataObject implementation that actually filters datatypes?

Many thanks in advance!

Stefan

Nick Parker2-Feb-04 9:15

Nick Parker

2-Feb-04 9:15

Have you taken a look at the article Component-Based Development with Visual C#[^], this is discussed there.

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s.keller2-Feb-04 9:21

2-Feb-04 9:21

Yes I read the article, a very helpfull article in general but very short about this particular problem. As I stated above the invokation without filter works fine Wink | ;-)

Cheers
Stefan

Heath Stewart2-Feb-04 9:49

2-Feb-04 9:49

Your IDataObject parameters - are you sure they are the COM interfaces and not the .NET interfaces (System.Windows.Forms.IDataObject)? These two interfaces are VERY different and won't be marshaled correctly. You must make sure that you use the IDataObject from COM, which should also have been defined when generating your RCW for the typelib containing IDocHostUIHandler (mshtmhst.dll) (and additional typelibs if forward-declaring additional interfaces from other typelibs).

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s.keller2-Feb-04 9:55

2-Feb-04 9:55

Yes, I am using MsHtmHstInterop.IDataObject - and yes you are right using System.Windows.Forms.IDataObject is lethal...

Thanks
Stefan

Heath Stewart2-Feb-04 9:58

2-Feb-04 9:58

Okay, then the "no-offense-meant,-I-have-to-ask" question: have you debugged your app and stepped through your implementation of FilterDataObject? What appears to be happening in there?

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s.keller2-Feb-04 10:45

2-Feb-04 10:45

Sure, you have to ask. When I step through the implementation the [in] IDataObject is valid and also the [out] IDataObject is either null or valid if I try to replace, but the return value S_OK, S_FALSE (which I have to set according to the MSDN) has no effect at all (either way & all combinations).

Heath Stewart2-Feb-04 10:50

2-Feb-04 10:50

Is the method return Type an int or similar? If you generated this automatically, it should be void. In the case that you can't (or don't want to) redefine this yourself, you can throw a COMException with the result code. It seems weird, I know, but it works. So, to send S_FALSE (S_OK doesn't require this since not throwing an exception is the same as returning S_OK unless the function signature is defined correctly), throw new COMException(null, 1). Hopefully this works for you.

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s.keller2-Feb-04 11:02

Textbox: Convert to float and backwards

2-Feb-04 11:02

Thats actually the way I'm doing it: the signature is like this

void IDocHostUIHandler.FilterDataObject(MsHtmHstInterop.IDataObject pDO, out MsHtmHstInterop.IDataObject ppDORet)

I definded this 2 constants

const int S_OK = 0;
const int S_FALSE = 1;

up to now I return either

throw new COMException("", S_OK);

or

throw new COMException("", S_FALSE);

skipped
throw new COMException("", S_OK);

and
replaced
throw new COMException(null, S_FALSE);

no result so far...

Thanks for your kind replies, I will leave it for now (it's getting late here) - I will figure it out sooner or later.

Cheers
Stefan

sps-itsec462-Feb-04 8:09

sps-itsec46

2-Feb-04 8:09

Hi guys!

My question is certainly trivial for you... Sigh | :sigh:

I want to convert the text of a textbox to a float with two digits after the separator. And then the whole thing backwards: Convert the float to a string, always showing two digits after the separator.

Right now I do it like that:

float myFloat = float.Parse(TextBox1.Text);  // string --> float
TextBox1.Text = myFloat.ToString();          // float  --> string

Everything works fine except for trailing zeros (e.g. '12,30' or 123,00'). The textbox doesn't show any trailing zeros. (I use a comma as separator cause it's a german application)

What can I do to show trailing zeros? Do I have to use IFormatProvider in some way?

Btw... these variables represent amounts of money (€). Is it possible to set somthing like a "currency-mode" for the textbox?

Many thanks in advance! Rose | [Rose]

mYkel

Charlie Williams2-Feb-04 8:37

Charlie Williams

2-Feb-04 8:37

TextBox1.Text = myFloat.ToString("F");

Charlie

if(!curlies){ return; }

OmegaSupreme2-Feb-04 8:43

OmegaSupreme

2-Feb-04 8:43

TextBox1.Text = myFloat.ToString("c");

check out Chris Sells format designer to experiment with format strings :

http://www.sellsbrothers.com/tools/#FormatDesigner

The smaller the mind the greater the conceit.
Aesop

Heath Stewart2-Feb-04 9:46

2-Feb-04 9:46

"C" and "c" are the format specifiers for currency, so unless you want a currency symbol in your number, don't use it. Instead, use "F" or "f" instead.

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OmegaSupreme2-Feb-04 9:58

OmegaSupreme

2-Feb-04 9:58

Good point, he did say 'Is it possible to set somthing like a "currency-mode" for the textbox?' though so I though thats what he wanted.

Cheers.

The smaller the mind the greater the conceit.
Aesop

Heath Stewart2-Feb-04 10:04

2-Feb-04 10:04

You're absolutely right, sorry! A lot of sentences in there and I guess I missed the last one. Blush | :O

In any case - to the original poster if you're following along - you should look at the CultureInfo class and its related properties (IFormatProvider implementations). For most ToString overloads (not the override from Object or another base class), the IFormatProvider (like the NumberFormatInfo) is used for the Thread.CurrentUICulture, so you don't really need to specify one unless you want to format for a different culture (just for that instance, otherwise you should set Thread.CurrentUICulture and re-initialize your controls) or pass your own IFormatProvider. Typically, such a ToString method (or methods like String.Format) will specify if they use the current CultureInfo for the format specifier.

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sps-itsec462-Feb-04 10:20

sps-itsec46

2-Feb-04 10:20

Thanks so much for your numerous and quick answers! I knew there is a simple solution... Wink | ;)

The myFloat.ToString("F") does all I need.

There's no difference between "f" and "F", right?

Regards, mYkel

Heath Stewart2-Feb-04 10:26

2-Feb-04 10:26

Mykel wrote:
There's no difference between "f" and "F", right?

Nope. See the documentation for NumberFormatInfo in the .NET Framework SDK for more information.

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Flickering

bouli2-Feb-04 7:20

bouli

2-Feb-04 7:20

Hi C# masters,

While I continue my investigation on C#, I'm currently testing some techniques I was used to use in MFC.

I have done the following things:
I derived a UserControl to write my own control. In the OnPaint overridable method, I want to do my drawings. As C# uses GDI+, it's cool, I also use GDI+ in C++.
In MFC I was doing the following thing:
- Instanciate a Bitmap object with the width, height, and color depth
- Link a Graphics object to this bitmap
- Work with this graphic object to generate my bitmap
- When the bitmap was generated, I displayed it on the drawing context.
Therefore, it looks like this
in MFC:

<br />
<br />
...<br />
class CMyWnd : public CWnd<br />
{<br />
  ...<br />
  afx_msg void OnPaint();<br />
  ...<br />
}<br />
<br />
...<br />
<br />
void CMyWnd::OnPaint()<br />
{<br />
  CPaintDC    dc(this);<br />
  Rect        rect;<br />
<br />
  GetClientRect((LPRECT) &rect);<br />
<br />
  Bitmap      bmp(rect.Width, rect.Height, PixelFormat32Bpp);<br />
  Graphics    memGraphics(&bmp);<br />
  Color       clr;<br />
<br />
  clr.SetFromCOLORREF(::GetSysColor(COLOR_3DFACE));<br />
<br />
  SolidBrush  brush(clr);<br />
  Pen         pen(Color::Red);<br />
<br />
  // drawings in memgraphics<br />
  memGraphics.FillRectangle(brush, rect);  // erase background<br />
  memGraphics.DrawLine(&pen, rect.X, rect.Y, rect.Width, rect.Height) // diagonal<br />
<br />
  // Bitmaps is generated<br />
  Graphics    graphics(&dc);<br />
  graphics.DrawImage(&bmp, rect);<br />
}<br />

And there were no flickering while resizing on the fly the derived window Smile | :)

So, I applied this technique to C#

<br />
protected override void OnPaint(PaintEventArgs e)<br />
{<br />
  Bitmap    bmp=new Bitmap(ClientRectangle.Width, ClientRectangle.Height);<br />
  Graphics  memGraphics=Graphics.FromImage(bmp);<br />
  Pen       pen=new Pen(Color.Red);<br />
  Brush     brush=new SolidBrush(SystemColors.Control);<br />
<br />
  memGraphics.FillRectangle(brush, ClientRectangle);<br />
  memGraphics.DrawLine(pen, ClientRectangle.X, ClientRectangle.Y, ClientRectangle.Width, ClientRectangle.Height);<br />
<br />
  e.graphics.DrawImage(bmp, ClientRectangle);<br />
}<br />

I remind that the Bitmap object is instancied on both languages to work on a bitmap in memory and once finished, I display the result.

But, in C#, when I resize the control on the fly, there is still flickering Confused | :confused:

Can any C# master explain me why???

Thanks.

Re: Flickering

Heath Stewart2-Feb-04 9:43