Re: COM interop question - C# Discussion Boards

Re: event , delegate , publish

cleverhouse24-Jul-07 6:44

cleverhouse

24-Jul-07 6:44

Thanks for the quick answer. I will try doing something like you suggested.
Thanks again.

Re: event , delegate , publish

led mike24-Jul-07 9:42

led mike

24-Jul-07 9:42

cleverhouse wrote:
I'm a beginner in C# .

So what other languages do you have experience with?
Have you previously created a Windows Service?
Have you previous experience with Interprocess Communications? If so, what communications mechanisms? Sockets? COM? CORBA? RPC? Message Queues????

Re: event , delegate , publish

BoneSoft24-Jul-07 10:44

BoneSoft

24-Jul-07 10:44

Sounds to me like you need to look into web services. Events and delegates not only accross threads but machines would take a lot of remoting. When web services were developed for just this situation.

Try code model generation tools at BoneSoft.com.

Using a USB Joystick in C#

Yeates24-Jul-07 5:41

Yeates

24-Jul-07 5:41

Hi,

I'm new to both C# and Windows programming in general but would like to use a USB joystick in my application. I managed this using Delphi and wonder if the same multimedia joystick API can be used in a similar way? It seems that Direct Input is mentioned more frequently in reference to C# although I only need a simple x,y,z value and some buttons presses from a basic joystick.

Can anyone reccomend a simple way to achieve this?

Thanks in advance!

Christian

Re: Using a USB Joystick in C#

Member 1678927-Oct-13 1:48

Member 16789

27-Oct-13 1:48

Hi I recommend DirectX DirectInput. I used a class developed by Alex Ward several years ago. First you need to install DirectX SDK. Unfortunately I couldn't find the original article at www.trossenrobotics.com but I can send you the code and SDK installer.

COM interop question

mhp13024-Jul-07 5:21

mhp130

24-Jul-07 5:21

Hi,

I have a C# window application calling a COM DLL written in VB6. I direct import the DLL using Add reference -> COM.

Now when I change the DLL and recompile it without changing the interface (the public method I use to expose), My C# got an exception that it could not find the interface. I need to derefence and then reference the dll again in my C# project to make it work, why is that? Does it mean I can not distribute dlls in a .NET environment without re-compile the application referencing the dlls?

Thanks

Re: COM interop question

originSH24-Jul-07 6:27

originSH

24-Jul-07 6:27

When you compile it does it change the version or the guids?

Re: COM interop question

mhp13024-Jul-07 7:05

mhp130

24-Jul-07 7:05

Sorry, my bad, forget to set binary compatible Y,

Thanks,

HelpProvider

RussBus24-Jul-07 4:52

RussBus

24-Jul-07 4:52

I have been reading the "Integrate Help Into Your .NET Apps" how-to and had a question about adding the ? to the form where the Maximize and Minimize boxes are in the title bar. Is there a way to add this without losing those boxes? Could I make my own button on my form that would call the same thing? (if so how would I do it?)

Thanks!

Calendar control help

swissmiss8624-Jul-07 4:42

swissmiss86

24-Jul-07 4:42

is it possible to pick more than one date(non continuous) using the calendar control? If so please help me.

Re: Calendar control help

Paul Conrad24-Jul-07 5:43

Paul Conrad

24-Jul-07 5:43

Assuming you are talking about the MonthCalendar control, from a quick glance, doesn't look like it. You could always create a custom control derived from the MonthCalendar control.

"The clue train passed his station without stopping." - John Simmons / outlaw programmer

Re: Calendar control help

led mike24-Jul-07 5:43

led mike

24-Jul-07 5:43

What does the documentation say about that?

Is there a dataGridView.clear() function?

auloepid24-Jul-07 4:42

auloepid

24-Jul-07 4:42

Or something of the sort. that clears out the dataGrid?

Re: Is there a dataGridView.clear() function?

Blue_Boy24-Jul-07 4:50

Blue_Boy

24-Jul-07 4:50

check this[^]

I Love SQL

Serialization

Mamphekgo Bahula24-Jul-07 4:22

Mamphekgo Bahula

24-Jul-07 4:22

Hi have created drawTool application were i am able to draw diagrams using dragable tools and save this digram as text files.i want this application to save this diagram as xml files

Mamphekgo

Re: Serialization

led mike24-Jul-07 4:38

led mike

24-Jul-07 4:38

mamphekgojakes wrote:
i want this application to save this diagram as xml files

Good idea

Re: Serialization

BoneSoft24-Jul-07 4:55

BoneSoft

24-Jul-07 4:55

Add System.Xml.Serialization attributes to your model. You'll likely have to do it manually since you already have a model built. But you can get a good idea of how to alter your model by producing a sample of what XML the model should produce, and running it through XSD.exe or Skeleton Crew[^]. It's really not difficult at all.

Try code model generation tools at BoneSoft.com.

Re: Serialization

led mike24-Jul-07 5:24

led mike

24-Jul-07 5:24

BoneSoft wrote:
by producing a sample of what XML the model should produce

or using a "standard" like.... maybe this[^] one.

Re: Serialization

BoneSoft24-Jul-07 5:29

BoneSoft

24-Jul-07 5:29

True, but that might be gross overkill... Depending on the project. I had to deal with a 'standard' when I was working for a travel site. It was a joke. HUGE set of schemas that all people we interacted with were 'compliant' with, while all having completely different models. But I've never looked at SVG, I'd assume since their problem domain is more technical they'd have a better standard model.

But also, I was thinking if he's already got a model built and working, he'd probably want to build an XML structure that closely resembles his model.

Try code model generation tools at BoneSoft.com.

bool values and radiobuttons

tthellebuyck24-Jul-07 3:43

tthellebuyck

24-Jul-07 3:43

I want to pass bool values(true/false) from a datagrid view to radio buttons to another form. Reason being, I am also passing other values from the grid to another form to edit the data. How could i go about passing a true or false value so when my edit form opens the radiobuttons are populated with either a true or false value, based on what value they hold in my datatable?

Thanks

Re: bool values and radiobuttons

originSH24-Jul-07 4:05

originSH

24-Jul-07 4:05

If you mean how do you pass the values to the new form, you can either do it via the constructor or Properties.

If you mean how do you set the radiobuttons is the .Checked property.

Re: bool values and radiobuttons

tthellebuyck24-Jul-07 4:13

tthellebuyck

24-Jul-07 4:13

Its both actually. I want to be able to select True or False two buttons, then pass that true or false value back to my datagrid. Do you have an example of how I can do that or does it all really depend on how data is passed back to the form?

Datagrid basics

imnotso#24-Jul-07 3:22

imnotso#

24-Jul-07 3:22

I have a datagrid on a web page. ASP.net.

One column is a date with an ID of DateReported. After binding the data from a SQL database to it
how do I check if that date if greater than today's date then change the colour of the cell to red. Or do I dothis as each row IS binding?

I've obviously looked on the web and have see 14 different ways to do it, all of them contridictory.

Is it not as simple as....

Foreach
{
If (ConvertToDateTime(myGrid.ColumnName.Equals("DateReported")) > TodaysDate)
{
myGrid.ColumnName.Equals("DateReported").colour.red
}
}

or similar. I'm getting rows, cells, grid items all confused after looking at the solutions offered. Any advice greatful for such a newbie.

TextBox.Clear() won't clear column that it Bind to.

kakarato24-Jul-07 3:09

kakarato

24-Jul-07 3:09

I bind text box below with a string typed datarow where the column i'm going to bind is DateTime. Below id the code:

this.txtDate.DataBindings.Add("Text", m_DataRow, "END_DT", true, DataSourceUpdateMode.OnPropertyChanged, null, "dd/MM/yyyy");

when i click on a chkbox event below fired:

<br />
        private void chkbox_CheckedChanged(object sender, EventArgs e)<br />
        {<br />
            Boolean isChecked = ((CheckBox)sender).Checked;<br />
<br />
            if (!isChecked)<br />
            {<br />
                this.txtDate.Clear()<br />
            }<br />
<br />
            // Line below will clear the text in text box an also clear the m_DataRow.END_DT.<br />
            //if (!isChecked)<br />
            //{<br />
            //    this.txtDate.Clear()<br />
            //    m_DataRow.SetEND_DTNull()<br />
            //}<br />
<br />
<br />
        }<br />

Date that show in the textbox is clear. How ever the date time still exist in m_DataRow.END_DT.
I Thought when i set the txtDate.Clear it should also clear the m_DataRow.END_DT some how it won't work. Please help.

Re: TextBox.Clear() won't clear column that it Bind to.

Le centriste24-Jul-07 3:38

Le centriste

24-Jul-07 3:38

Did you call m_DataRow.AcceptChanges()?

On a side note, if the user unchecks the button, do not clear the text box, just make it read-only and ignore its content. If the user changes his mind, just make it editable again and he won't have to re-enter it.

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