Calling C# dll from VC6 MFC application.. Possible ? - C# Discussion Boards

Patric_J3-Aug-05 8:31

3-Aug-05 8:31

Implement events on the business objects (Model) which your forms (View) should subscribe to. Whenever a business object is changed it should fire an event and whatever forms are interested in the change will be notified and can update itself.

/Patric
My C# blog: C# Coach

Re: View update pattern

ppp0013-Aug-05 13:13

ppp001

3-Aug-05 13:13

Thanks for your reply.

Are there any sample codes or reference on this kind of
implementation ?

identity map

ppp0013-Aug-05 5:45

ppp001

3-Aug-05 5:45

I have read the identity map pattern in the book "Patterns of enterprise application architecture".
But I have one question as below,

1. for the "Identity map" pattern in P.198 example,
it add the created object onto the map, but how it is removed when the object usage
is completed ? And if there are more than one consumer using the object, how do we
know it is right to remove the object in the map ?

Thanks for you help

Some way to Notifiy RDBMS changes to Clients

NarayanVl3-Aug-05 4:05

NarayanVl

3-Aug-05 4:05

let's say, Clients are installed in some remote locations (windows based application). all clients are connecting the same RDBMS data store via some component/serivice . but, instead of using tcp/ip protocal. Is there a way to notify the clients that the data changed in RDBMS data store .

Regards
Narayan

Re: Some way to Notifiy RDBMS changes to Clients

Judah Gabriel Himango3-Aug-05 4:31

Judah Gabriel Himango

3-Aug-05 4:31

Have a server/service running on the same machine as the database, have clients talk through the server to send/receive data. Thus the server application can notify clients of changes via remoting or sockets.

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Homosexuality in Christianity
Judah Himango

Tricky XPath query C#

abcxyz823-Aug-05 3:17

abcxyz82

3-Aug-05 3:17

Below is the sample xml analgous to mine,

"=============
<code><INVENTORY>
<BRANCH CODE='BC1'...>
<DEPTS>
<DEPT CODE='DC1'>
<EMP NAME='A' ...>
<EMP NAME='B' ...>
</DEPT>
<DEPT CODE='DC2'>
<EMP NAME='E' ...>
<EMP NAME='F' ...>
</DEPT>
</DEPTS>
</BRANCH>
<BRANCH CODE='BC2'>
...
</BRANCH>
</INVENTORY>
</code>==========="

Now, I am trying write a function which says an employee with name xxx belongs to Dept xxx or not? taking two parameters, <code>DEPT_NODE</code> and <code>EMPNAME</code> as parameters. I can not change the signature as its from top.

how to write an Xpath query for that?

Thanks for anticipation.
Regards.
MaulikCE
<pre></pre>

Re: Tricky XPath query C#

hamster13-Aug-05 8:16

hamster1

3-Aug-05 8:16

Try this:
<code>
//DEPT[@CODE="DC1"]/EMP[@NAME="A"]
</code>

----------------------
~hamster1

Calling C# dll from VC6 MFC application.. Possible ?

Thierry Maurel3-Aug-05 3:10

Thierry Maurel

3-Aug-05 3:10

Hi everybody,
I actually work on a big application (VC6, MFC), and I need working with the Viamichelin Web Service through SOAP (http://ws.viamichelin.com/wswebsite/fra/jsp/tec/MaDocumentationGeo.jsp).
My first idea is the development of a VSNET 2005 dll, in C++, to do the bridge between the 2 worlds. Some try are ok, with very simple WSDL (input string -> output string). Unfortunally, Viamichelin WSDL are too complex (or I don't understand something...) to be used from C++ (error SDL1030 when adding Web Reference).
WSDL example is here...
http://www.viamichelin.com/ws/services/GenerateMap?wsdl

JScript cannot be a solution too, there is an error in the MSSoapInit.
Other try is a C# project. The web reference is ok, but how can I do :
- a 'true' dll from the C# project ?
- export some functions which are accessibles from my VC6 project ?

Do you have an idea to do what I need ? The answer "do all the portage of VC6 to VSNET 2005" is not a solution, we cannot have such time to redo our non-regressions tests...

Thanks in advance

Thierry Maurel
Isotools Project Manager

Re: Calling C# dll from VC6 MFC application.. Possible ?

Joel Lucsy3-Aug-05 3:58

Joel Lucsy

3-Aug-05 3:58

You can host the CLR in your app. You will then be able to load and call into managed dlls. Try searching for hosting and CLR. If you don't find what you're looking for, post back and I'll try to hook you up with an example.

--
Joel Lucsy

Re: Calling C# dll from VC6 MFC application.. Possible ?

Alomgir Miah3-Aug-05 7:36

Alomgir Miah

3-Aug-05 7:36

In the C# DLL do something like

using System;
using System.Windows.Forms;
using System.Data;
using System.Collections;

namespace TestDotNet
{
///
/// Summary description for Class1.
///
[Guid("43A8EB80-A566-4985-BEDE-58312478029D")]
public interface ISearch
{
string ShowAdvancedSearch();
string[] GetSearchData(string inputXml);
string GetXmlSearch();
}
}

Implement the interface. When you build it, the DLL is automatically registered. It uses tlbexp.exe internally.

Hope this helps.

Live Life King Size
Alomgir Miah

Live Life King Size
Alomgir Miah

ExpandableObjectConverter problem

Shane Stevens3-Aug-05 3:09

Shane Stevens

3-Aug-05 3:09

Hi,

I have written a cutsom TypeConverter which derives ExpandableObjectConverter which is used for a custom type descriptor. The custom type descriptor overrides the GetProperties function to return a dynamically created PropertyDescriptorCollection.

This call works great in that when I set my custom object into a property grid it all displays dynamically as expected, except for one little annoyance: Even if I return an empy PropertyDescriptorCollection in the GetProperties function of my derived ICustomTypeDescriptor class, I still get the little plus sign next to the property! So in other words, I just can't seem to get the plus sign to disappear on types which have no properties. Confused | :confused:

Can anyone please shed any light on this for me?

Shane

Re: ExpandableObjectConverter problem

leppie3-Aug-05 6:41

leppie

3-Aug-05 6:41

Override bool GetPropertiesSupported(ITypeDescriptorContext) too to return false.

^{xacc-ide 0.0.15 now with C#, MSIL, C, XML, ASP.NET, Nemerle, MyXaml and HLSL coloring - Screenshots}

Preserving comments with XmlDocument.Load

LannieK3-Aug-05 2:48

LannieK

3-Aug-05 2:48

I am reading an XML file in using XmlDocument. The XML file may contain comments that I want to capture and deal with. When I look at the nodes that XmlDocument returns, though, there are no XmlComment nodes. I can see how to create comments using the CreateComment method, but how do I preserve them when I read them in?

Re: Preserving comments with XmlDocument.Load

Lars Niedziolka3-Aug-05 14:19

Lars Niedziolka

3-Aug-05 14:19

Hi Lannie,

XmlDocument contains all comments if you load an xml document.
But the most access functions ignore comments.

But following simple code shows message boxes with both comments:

/*
 <test>
   <!-- super tip -->
   <tip>Close a application with the cross in the right top corner of the window.</tip>
   <!-- stupid tip -->
   <tip>1+2=3</tip>
</test>
*/
string xmlstring = @"<test><!-- super tip --><tip>Close a application with the cross in the right top corner of the window.</tip><!-- stupid tip --><tip>1+2=3</tip></test>";
XmlDocument doc = new XmlDocument();
doc.LoadXml(xmlstring);
XmlNode node = doc.SelectSingleNode("/test");
for (XmlNode subnode = node.FirstChild; subnode != null; subnode = subnode.NextSibling)
{
   XmlComment comment = subnode as XmlComment;
   if (comment != null)
     MessageBox.Show(comment.Value);
}

That the XmlDocument contains all comments you see if you look at the OuterXml property of the XmlDocument or save the document in a file.

The Comment direct before a XmlElement you get with element.PreviousSibling as XmlComment.
The Comment direct behind a XmlElement you get with element.NextSibling as XmlComment.

Hope it's help

Niedzi

DataGrid need HELP

zaboboa3-Aug-05 2:44

zaboboa

3-Aug-05 2:44

Hello,

I got a problem with DataGrid events. I have an event:

private void GridTextBoxLeave (object sender, System.EventArgs e)<br />
		{<br />
			DataGridCell cell = this.dataGridStages.CurrentCell;<br />
			int r = cell.RowNumber;<br />
			int c = cell.ColumnNumber;<br />
			this.dataGridStages.EndEdit(this.dataGridStages.TableStyles["Stages"].GridColumnStyles[c], r, false);<br />
			<br />
			<br />
			object val = this.dataGridStages[r,c];<br />
		   Debug.WriteLine("Leaving Cell Row: "+r+" - Column: "+c+" - Value: "+val);<br />
		   <br />
		}

and definition of an event:

foreach( DataGridTextBoxColumn dataGridTextBoxColumn in this.styleStages.GridColumnStyles ) <br />
			{<br />
				dataGridTextBoxColumn.TextBox.Leave += new EventHandler(this.GridTextBoxLeave);<br />
				//dataGridTextBoxColumn.TextBox.Enter += new EventHandler(this.GridTextBoxEnter);<br />
				<br />
			}<br />
<br />
this.dataGridStages.DataSource = this.dataview;

The problem is, every time I add new row (adds it automatically in the grid if you click on the last row) no events are fired, which is good. Then, the moment I start typing in any cell of a new row, new row added (with * beside it) and Leave event fires, although I am still in the cell.
And when I leave the cell it fires again. What can I do to suppress the first fire of an event (while I am still in the cell).

Thank you

typecast problem

Goebel3-Aug-05 0:30

Goebel

3-Aug-05 0:30

Hi
As a quick example take the following expression:

int temp = (int)((4.5f - 1.0f)/0.1f);

The value 34 is assigned to temp. To be honest, I expected the value 35. So what's going on under the hood?

I appreciate any comments.

Cheers,
Goebel

Re: typecast problem

Guffa3-Aug-05 0:42

Guffa

3-Aug-05 0:42

Floating point numbers can seldom represent a value exactly. The result of the calculation is probably something like 34.99999999999999999999. When you type cast this to an integer, the decimal part is discarded, giving you only 34.

Use Math.Round to round the value to the nearest whole number, then type cast it.

---
b { font-weight: normal; }

Re: typecast problem

Goebel3-Aug-05 2:15

Goebel

3-Aug-05 2:15

Alright, I'll use the Math.Round.

Anyway, if I ask the debugger it says 35.0 for the following expression:

float temp = (4.5f - 1.0f)/0.1f;

Weird, isn't it?

Re: typecast problem

Goebel3-Aug-05 2:21

Goebel

3-Aug-05 2:21

It's me again. I think I've found the problem.
In the known expression

int temp = (int)((4.5f - 1.0f)/0.1f);

((4.5f - 1.0f)/0.1f) seems to be treated as a double value (to be more precise, this kind of double: 34.9999...). But why? Every single number has a nice f as suffix, it should be treated as a float.

Any ideas?
Cheers,
Christoph

Re: typecast problem

Guffa3-Aug-05 5:55

Guffa

3-Aug-05 5:55

It's only the debugger that uses double values for the calculation. I don't know why.

If you try this:

((4.5f - 1.0f)/0.1f).GetType().FullName

it will give the result "System.Single".

---
b { font-weight: normal; }

Setup surface

mamudo3-Aug-05 0:16

mamudo

3-Aug-05 0:16

Hi everybody,

i want create a setup surface for an installer. My problem is that i want to select the folder, in which the program should install. For that i want button to select the folder. I´ve one DLL and one Form.cs. How could i do that?

THX

Mamudo

PS: Sorry for my english Roll eyes | :rolleyes:

runtime problem

nidhelp2-Aug-05 22:50

nidhelp

2-Aug-05 22:50

hi
i've a form with buttons at the left and tabpages of information at the right of the form.. my problem is, how can i load my form without the tabcontrol at runtime? i juz want to show what's available at the left of the form at runtime. only after pressing the buttons then the right of my form (tabpages) will be shown..

thanks

Re: runtime problem

Mohamad Al Husseiny2-Aug-05 23:18

Mohamad Al Husseiny

2-Aug-05 23:18

you can make it invisible and set it visible when you need them
but if you need to load them at run time you can do this
remove the tab from InitializeComponent
and write the method that initialize it when you need
call it when you need to load the tab

Re: runtime problem

mav.northwind2-Aug-05 23:18

mav.northwind

2-Aug-05 23:18

Hi!
Unfortunately, TabPages don't have a Visible property, so you can either make the whole TabControl invisible or remove all unwanted TabPages from the TabPages collection of TabControl.
You can also add TabPages to the TabControl at runtime when a menu item is selected.

Regards,
mav

Re: runtime problem

Mohamad Al Husseiny2-Aug-05 23:30

Mohamad Al Husseiny

2-Aug-05 23:30

this code sample load control at run time

Button b=new Button();
b.Name="b1";
b.Text="Text";
b.Location=new Point(25,25);
//add to form
this.Controls.Add(b);

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.