C# Discussion Boards - CodeProject

leppie28-Sep-04 0:37

leppie

28-Sep-04 0:37

Claudia Peschke wrote:
This works fine in Design time in Visual Studio but not at runtime for the property grid on my form. What's wrong?

You will have to fool the enviroment that it is in design mode then. google for "designerhost" Smile | :)

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How to program outlook express in C# ?

ppp00127-Sep-04 22:44

ppp001

27-Sep-04 22:44

Hi all,

How can i program outlook express in c#, e.g. get email items in
the inbox of outlook, activate outlook express to check emails ?

Thanks
Patrick

System.UInt32 -> Integer

El'Cachubrey27-Sep-04 22:40

El'Cachubrey

27-Sep-04 22:40

Hi simplest question how i can convert System.UInt32 to Integer and backward.

THANK

Re: System.UInt32 -> Integer

exhaulted27-Sep-04 23:04

exhaulted

27-Sep-04 23:04

System.UInt32 u = 0;
int x = (int)u;
u = (UInt32)x;

Just be carefull that the values are valid or you will get an exception.
Incase you are going to try and catch it i think the exception is InvalidCastException but i'm not sure on that one.

Kev

Re: System.UInt32 -> Integer

Colin Angus Mackay27-Sep-04 23:51

Colin Angus Mackay

27-Sep-04 23:51

exhaulted wrote:
Just be carefull that the values are valid or you will get an exception

You won't unless you ask for one. C# will just convert it without fuss even if the value is out of range for the new type.

exhaulted wrote:
the exception is InvalidCastException but i'm not sure on that one

It is a System.OverflowException

Do you want to know more?

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Re: System.UInt32 -> Integer

Colin Angus Mackay27-Sep-04 23:48

Colin Angus Mackay

27-Sep-04 23:48

So long as the values are in the range 0 to 2147483647 then there are no problems.

If you exceed the upper value the operation overflows. For instance: (int)UInt32.MaxValue results in -1 (negative one). This does NOT throw an exception.

If you need an exception to be thrown you can wrap the casting operation inside a checked statement.

Consider this code:

// Initial value
uint a = UInt32.MaxValue;
Console.WriteLine("a = {0}", a);

// cast to int
int b = (int)a;
Console.WriteLine("b = {0}", b);

// cast to int with an System.OverFlowException if out of range
int c = checked((int)a);
Console.WriteLine("c = {0}", c);

Does this help?

Do you want to know more?

Not getting the response you want from a question asked in an online forum: How to Ask Questions the Smart Way!

how to insert into table throw datagrid

Mikel Fayad27-Sep-04 21:38

Mikel Fayad

27-Sep-04 21:38

I'm trying to insert by using adapter1.Update(dataset1);
but I get an exception

Devil Linux

Re: how to insert into table throw datagrid

exhaulted27-Sep-04 21:59

exhaulted

27-Sep-04 21:59

What exception did you get????
Have you included a primary key in the table in your dataset?
The update method requries the primary key to be able to update.

Kev

Re: how to insert into table throw datagrid

exhaulted27-Sep-04 23:22

exhaulted

27-Sep-04 23:22

Have just read your Subject again, are you trying to update your table using the update statement? If so then you should know that the update method of a dataAdapter is only used to update a database with changes made in your dataSet.

To insert rows into your table you need to use the dataAdapter.Fill() method.

Kev

Dial up program

Connie Connie27-Sep-04 20:32

Connie Connie

27-Sep-04 20:32

I'm looking for some code which do the dial up through phone line?

would be nice if anyone can share thier code with me.

RichTextBox Flickering

Member 139683327-Sep-04 17:55

Member 1396833

27-Sep-04 17:55

To see what I am talking about, create a WinForm application and add a RichTextBox to the form. Compile the application and run it.

Start typing into the richtextbox. Then paste an image into it. Then continue typing on the line below or above the pasted image. The flicker is unbearable.

If someone can give me some direction on overriding the OnPaint(PaintEventArgs pe) event to be able to successfully paint both images and text, it would be helpful and very much appreciated.

I posted once before and nobody provided any solution.

Thank you in advance for any help.

JB

Re: RichTextBox Flickering

leppie27-Sep-04 23:29

leppie

27-Sep-04 23:29

I tried it, got the same. AFAIK there is nothing you can do about it. Frown | :(

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C# and C++ interop question

Werdna27-Sep-04 16:58

Werdna

27-Sep-04 16:58

I have an application written in C++ that allows me to write addons. It has a public .h file with some class definitions. I can create .dll that has known entry point and that entry point will receive as one of it's parameters pointer to internal class from the app.
Now I have C# library (that I use in other projects) and I want to use it within the application.

My first thought was to use regasm and use COM to do all the interop. Might work, but I've never done any COM from C++ and it looks a bit messy.

My second approach would be to use managed C++ (which I haven't tried either).

So my question is:
If I write my .dll with managed c++ and use my library (written in C#), will the application be able to load the library? How will CLR be loaded? This lib is written for .net 2, and I can use the new CLI C++, which looks nicer than 1.0

Also, If I have static objects within my library, will those be loaded upon each call?

Thanks.

Re: C# and C++ interop question

BAIJUMAX27-Sep-04 17:48

BAIJUMAX

27-Sep-04 17:48

Hi,
My suggestion is ,
Create Com (ActiveX Dll),using ATL.It's very simple .And u Don't Have To Break Heads On it.

Start -> ATLCOMAPPWIZARD -> Create Simple Object , This Will Your Interface from Outside.Okay,
Now,
Create Methods Exactly With Same As In Your Class written C++ [ ".cpp And .h"].
Each Methods In The Interface Will Actually wraps The Methods In Your .cpp .

For Example :-
Your C++ Class Implements add Fuction
YourClass.add(long a, long b)

you just call this method from
YourDll.Add(long a,long b)

create the dll.

u can add this dll into C# project.By Add reference Method
[Note:- U Can Use This In Any Language that Supports COM]
Okay.Any doubts feel free to contanct me

by
baijumax

Re: C# and C++ interop question

Werdna28-Sep-04 1:55

Werdna

28-Sep-04 1:55

I think you misunderstood my question.
I have .net library that I need to use from within C++.
I do not need to expose C++ as COM, I wanted to expose .net as COM and use it from within C++.

Re: C# and C++ interop question

shaileshkumar27-Sep-04 22:45

shaileshkumar

27-Sep-04 22:45

Without using managed c++, also if your apis exposed do not have complex data structures used, you can export the dll and straight away marshal these apis to your own defined api and use it in your code using pinvoke.
For e.g.
[DllImport("Advapi32.dll", CharSet=CharSet.Auto)]
static extern Boolean FileEncryptionStatus(String filename,
out UInt32 status);

Try some search on pinvoke.

- Shailesh

Re: C# and C++ interop question

Werdna28-Sep-04 1:58

Werdna

28-Sep-04 1:58

The app has several quite big C++ abstract classes. My dll will get loaded and passed one of the classes (actually some object derived from this class).

Re: C# and C++ interop question

shaileshkumar28-Sep-04 2:01

shaileshkumar

28-Sep-04 2:01

I am not sure i understood you, you want to import the class or class static functions?
Could you elaborate a little more?

- Shailesh

wizard style in windows form app

Cholillo27-Sep-04 16:47

Cholillo

27-Sep-04 16:47

hey dudes, I'm trying to make an app that looks like the new Windows XP wizards in C#, but the best way I found to do it is adding and removing the controls in the main form as I needed, I search for an example but I didn't find somethin', someone knows a better away??

thnx in advanced and sorry for my poor english Frown | :(

DataGrid Column Colors

MarkMokris27-Sep-04 15:57

MarkMokris

27-Sep-04 15:57

I am using the Windows Forms DataGrid and I would like to change the Foreground and/or Background colors of individual columns. Could someone suggest the easiest way to do that?

Thanks!

Mark

Re: DataGrid Column Colors

sreejith ss nair27-Sep-04 20:46

sreejith ss nair

27-Sep-04 20:46

hi,

Pleasse refer my article DataGridFormattings. There i mentioned every thing what you need now. Smile | :)

Sreejith Nair

C# and Scanner

GA-BOYZ27-Sep-04 15:17

GA-BOYZ

27-Sep-04 15:17

Hi,

Is it possible to create application in C# to work with a scanner?
Since I want to scan the document, and then save it to SQL Server.

If it's possible, please kindly give me some information on how can I do this.
Since I've tried looking in MSDN and couldn't find any resources.

Thank you very much in advance Smile | :)

Best regards,

Antonius

Re: C# and Scanner

Alex Korchemniy27-Sep-04 16:40

Alex Korchemniy

27-Sep-04 16:40

The term you are looking for is "Windows Image Acquisition" (WIA)

How do i get the location of a control in screen coordinates?

FocusedWolf27-Sep-04 12:35

FocusedWolf

27-Sep-04 12:35

The reason:
I made a tooltip control that doesn't rely on dllimports at all which is pretty cool i think Big Grin | :-D

and i want the control to appear below whatever button summons...I don't want to just use mouseposition and load it where the mouse clicks because that would look unprofessional i think.

The question:
How to i get the location of a control relative to its position on the screen. I was thinking of somehow determining incremently all the outermost parents that encase the button that i want the screen coords of and adding up some stuff...

Are their any cleaner methods?

Re: How do i get the location of a control in screen coordinates?

Brian Nottingham27-Sep-04 12:40

Brian Nottingham

27-Sep-04 12:40

Something like this maybe...

Point screenPt = control.Parent.PointToScreen(control.Location);

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