C# Discussion Boards - CodeProject

TigerNinja_9-Apr-03 13:53

9-Apr-03 13:53

If your using threads I highly recommend using the ThreadPool class. Caution, there is an error with the ThreadPool with WebRequests, but I am not sure if it applies to Dns class.

R.Bischoff | C++

.NET, Kommst du mit?

Key mappings

CP039-Apr-03 9:26

CP03

9-Apr-03 9:26

Can I map key combinations (like Alt-2) to form methods in C#.

I should mention, Windows Forms apps...

Database filtering quandries

RB@Emphasys9-Apr-03 9:07

RB@Emphasys

9-Apr-03 9:07

Hello people,

I have a quick question for you. I am currently importing data into an access database and i need to check each field and make sure that it does not exceed the maximum lenth of the fields in our database. So.... I create a DataSet, the a DataTable, and then use the column collection to try and find the max length of the field, something like this:

oDataTable.Columns[k].MaxLength

All I ever seem to get is a -1 for the maxlength, although all the other data shows up great. I was wondering if anyone had a suggestion as to what Im doing wrong.

Thanks so much!
Ryan

C# Equiv to WITH in VB.NET

Dato9-Apr-03 6:57

Dato

9-Apr-03 6:57

I was wondering if there is a C# equivalent to the 'with' stmt in vb.net ..
I have some code that sure needs it!
thks in advance .

Re: C# Equiv to WITH in VB.NET

Daniel Turini9-Apr-03 7:09

Daniel Turini

9-Apr-03 7:09

Dato wrote:
I was wondering if there is a C# equivalent to the 'with' stmt in vb.net ..
No, there isn't, and some people think that there should not be, I'll explain why below.

Dato wrote:
I have some code that sure needs it!
So, put this code in a method in this object.

It's not the fall that kills you: it's the sudden stop - Down by Law, Jim Jamursch (1986)

Re: C# Equiv to WITH in VB.NET

J. Dunlap9-Apr-03 8:31

J. Dunlap

9-Apr-03 8:31

I came up against this problem, too, and no, you can't always put the code in a method of the object. I don't see any reason not to have a with block statement, except that C++ didn't have one, which is a very poor excuse!

"Do unto others as you would have them do unto you." - Jesus

"An eye for an eye only makes the whole world blind." - Mahatma Gandhi

Re: C# Equiv to WITH in VB.NET

Roger Alsing10-Apr-03 3:13

Roger Alsing

10-Apr-03 3:13

so what is the problem?
if you are going to set props on a something down a hirarchy like:

MyBlah.SomeBluh.LastWow.Gnu.BackColor=color.red;<br />
MyBlah.SomeBluh.LastWow.Gnu.ForeColor=color.green;<br />
MyBlah.SomeBluh.LastWow.Gnu.Text="hello you!"

it would be very simple to just make a temp holder for gnu:

GnuType g=MyBlah.SomeBluh.LastWow.Gnu;<br />
g.BackColor=color.red;<br />
g.ForeColor=color.green;<br />
g.Text="hello you!"

that would do the exact same thing . ok . you would have to type "g" infront of every prop , but thats about it...

//Roger

Re: C# Equiv to WITH in VB.NET

Member 26118811-Apr-03 1:14

Member 261188

11-Apr-03 1:14

I think that using a temporary holder (many times) floods the memory untill the garbage collector comes. And how would you release the resources used by g?

Re: C# Equiv to WITH in VB.NET

Roger Alsing11-Apr-03 1:51

Roger Alsing

11-Apr-03 1:51

take a good long reading about reference types...

that will sort things out for you..

//Roger

Sending/Simulating Mouse Clicks

CyberKewl9-Apr-03 4:41

CyberKewl

9-Apr-03 4:41

I'm developing a software which is similar to PCAnywhere and would like to know how to send / simulate a mouse click (with co-ordinates and stuff) that is not form dependant meaning that i can send / simulate the mouse click anywhere i want, be it the taskbar, tray icon, etc. How do i go about doing it? Are there any samples for this sort of thing?

Re: Sending/Simulating Mouse Clicks

J. Dunlap9-Apr-03 8:34

J. Dunlap

9-Apr-03 8:34

In Win98 or higher, there is a function called SendInput which you can use to send input as if it is coming from the keyboard, the mouse, or even another device. For any OS below that, you have to simulate it by using windows messages.

"Do unto others as you would have them do unto you." - Jesus

"An eye for an eye only makes the whole world blind." - Mahatma Gandhi

Re: Sending/Simulating Mouse Clicks

CyberKewl9-Apr-03 12:51

CyberKewl

9-Apr-03 12:51

After some searching yes that's the only way i guess but it seems to require me to define the structs, do you happen to know the full definitions and probably show me a sample syntax on how to call it?

Re: Counting characters from a text file

Le centriste9-Apr-03 4:37

Le centriste

9-Apr-03 4:37

Wrong forum. This is c#.

<-- Post of the week

Stephane Rodriguez.9-Apr-03 5:34

Stephane Rodriguez.

9-Apr-03 5:34

Nuf said.

Re: Counting characters from a text file

leppie9-Apr-03 7:04

leppie

9-Apr-03 7:04

Nope, not sharp enuf

I rated this article 2 by mistake. It deserves more. I wanted to get to the second page... - vjedlicka 3:33 25 Nov '02

find network computers

Andrei Matei9-Apr-03 1:40

Andrei Matei

9-Apr-03 1:40

Hi,
How can I find the names and/or IPs of the computers on my LAN (the ones that I see in Explorer)? Please help, I really don't have a clue...

Thanks a lot!

Andrei Matei
andreimatei@home.ro

Re: find network computers

Richard Deeming10-Apr-03 4:31

Richard Deeming

10-Apr-03 4:31

Have a look at http://www.codeproject.com/csharp/servercombobox.asp[^]

"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

Re: find network computers

Andrei Matei10-Apr-03 5:52

Andrei Matei

10-Apr-03 5:52

Thanks a lot, just what I needed.

Andrei Matei
andreimatei@home.ro

Using arraylist as a datasource

Venkatraman8-Apr-03 18:21

Venkatraman

8-Apr-03 18:21

Hi,

We can use an arraylist of objects as a datasource for a datagrid. We need to have public properties in that object to shown as columns. My question is if we are exposing another type as a public properties how can we show that.

It can be a master detail relation ship.

Cheers,
Venkatraman Kalyanam
Chennai - India

"Being Excellent is not a skill, it is an attitude"

keybd_event for .NET?

Alvaro Mendez8-Apr-03 9:36

Alvaro Mendez

8-Apr-03 9:36

What's the equivalent of the Win32 API keybd_event (or SendInput) for .NET?

Thanks,
Alvaro

When birds fly in the right formation, they need only exert half the effort. Even in nature, teamwork results in collective laziness. -- despair.com

Re: keybd_event for .NET?

J. Dunlap8-Apr-03 9:38

J. Dunlap

8-Apr-03 9:38

I don't know, but there is no rule that you can't use API's in .NET! Smile | :)

"Do unto others as you would have them do unto you." - Jesus

"An eye for an eye only makes the whole world blind." - Mahatma Gandhi

Re: keybd_event for .NET?

Alvaro Mendez8-Apr-03 11:08

Alvaro Mendez

8-Apr-03 11:08

I know, but why reinvent the wheel? You'd think that something like this would already be there, somewhere... Unsure | :~

Thanks,
Alvaro

When birds fly in the right formation, they need only exert half the effort. Even in nature, teamwork results in collective laziness. -- despair.com

Re: keybd_event for .NET?

Katalyst8-Apr-03 10:11

Katalyst

8-Apr-03 10:11

I had a similar question that I posted a couple of days ago, with mixed results. See thread:

http://www.codeproject.com/script/comments/forums.asp?msg=466571&forumid=1649#xx466571xx

I tried calling keybd_event from C# through an extern declaration, like this:

<br />
[DllImport("User32.dll")]  <br />
private unsafe static extern void keybd_event(byte bVk, <br />
                                              byte bScan, <br />
                                              uint dwflags, <br />
                                              ulong* dwExtraInfo);<br />

For me, this works the first time but is flaky after that. I'm not sure why, but it's possible that the last two parameter types are off -- I wasn't exactly sure what to use there.

Re: keybd_event for .NET?

Alvaro Mendez8-Apr-03 11:07

Alvaro Mendez

8-Apr-03 11:07

It's amazing that there isn't something equivalent to this in .NET already! I'm still hopeful that it's in there somewhere, but we just haven't located it.

Anyway, I did a search using Google and got to this link:

http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&q=keybd_event&btnG=Google+Search&meta=group%3Dmicrosoft.public.dotnet.languages.csharp[^]

The second link there shows one way to declare keybd_event inside the program:

http://groups.google.com/groups?q=keybd_event+group:microsoft.public.dotnet.languages.csharp&hl=en&lr=&ie=UTF-8&oe=UTF-8&selm=1DQ6HJ7VCHA.1780%40cpmsftngxa10&rnum=2[^]

I'll give that a shot, and I'll also dig a little more slowly into the .NET library to see if I can spot it. You'd have thought the Application class would have been the place, but nope.

Thanks for your help,
Alvaro

When birds fly in the right formation, they need only exert half the effort. Even in nature, teamwork results in collective laziness. -- despair.com

Found it!

Alvaro Mendez8-Apr-03 11:34

Alvaro Mendez

8-Apr-03 11:34

My digging payed off!! Smile | :)

I found a class called SendKeys class in the System.Windows.Forms namespace. Not the most intuitive name, but hey, it's a lot better than that awful keybd_event.

Regards,
Alvaro

When birds fly in the right formation, they need only exert half the effort. Even in nature, teamwork results in collective laziness. -- despair.com

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