Re: Compile error, help! - C# Discussion Boards

24-Feb-02 11:18

BTW, the prefix to access the file is actually the default namespace for the project. If you blank out your default namespace, you will then access the icon by just "Icons".

--
Peter Stephens

Compile error, help!

22-Feb-02 16:55

s = new Socket(
AddressFamily.InterNetwork,
SocketType.Dgram,
ProtocolType.Udp );

s.Bind(localEndPoint);

s.SetSocketOption(SocketOptionLevel.Udp, SocketOptionName.ReceiveTimeout,1000);

This code produces a runtime error:

An unknown, invalid, or unsupported option or level was specified in a getsockop
t or setsockopt call

Any help anyone ? I just want to set a timeout on recive of a UDP packet.

Re: Compile error, help!

James T. Johnson22-Feb-02 17:11

James T. Johnson

22-Feb-02 17:11

I believe it is because UDP doesn't support Timeouts, or so this thread on the Advanced DOTNET list seems to suggest.

Yes just when you thought I couldn't push the DOTNET mailing list anymore they make a new one! Laugh | :laugh:

Hope that thread gives you some ideas,

James

Sonork ID: 100.11138 - Hasaki
"My words but a whisper -- your deafness a SHOUT.
I may make you feel but I can't make you think." - Thick as a Brick, Jethro Tull 1972

Re: Compile error, help!

Anders Molin24-Feb-02 11:28

Anders Molin

24-Feb-02 11:28

You are right, UDP is "connectionless", and because of that you can't set a timeout.

When you send UDP packets, you just send them, but you never know if the reciever get the packets or not...

- Anders

Money talks, but all mine ever says is "Goodbye!"

Re: Compile error, help!

Peter Stephens24-Feb-02 11:43

Changing value of all TextBoxes

24-Feb-02 11:43

Thanks, James, for the link to those two DotNet mailing lists. I'm already signed up! Big Grin | :-D

--
Peter Stephens

Gavin_Mannion21-Feb-02 22:59

Gavin_Mannion

21-Feb-02 22:59

Hi All,

Simple question here (I Hope)

I need to reset all my textboxes back to blank and am trying to do it in a nice clean loop.

I have the following but it does not work

foreach (TextBox t in this)
{
	t.Text = "";
}

I am getting the error message

C:\Documents and Settings\gavin\My Documents\Visual Studio Projects\LTBRMaintenance\EditClinic.cs(487): foreach statement cannot operate on variables of type 'LTBRMaintenance.EditClinic' because 'LTBRMaintenance.EditClinic' does not contain a definition for 'GetEnumerator', or it is inaccessible

I have a feeling I am nearly there but am missing something obvious..

Thanks

SimonS21-Feb-02 23:07

SimonS

21-Feb-02 23:07

I think that this is just an object and doesn't natively expose a GetEnumerator method. Try this:

foreach(Control c in this.Controls)
{

if(c.GetType().ToString()=="System.Windows.Forms.TextBox")
c.Text="new vlaue";

}

Cheers,
Simon

X-5 452 rules.

Gavin_Mannion21-Feb-02 23:26

Gavin_Mannion

21-Feb-02 23:26

That is exactly it.

Smile | :)

Thanks

James T. Johnson22-Feb-02 7:27

James T. Johnson

22-Feb-02 7:27

simons wrote:
if(c.GetType().ToString()=="System.Windows.Forms.TextBox")

You could also use; if( c is System.Windows.Forms.TextBox ) this lets the value change for controls derived from TextBox too Smile | :)

James

Sonork ID: 100.11138 - Hasaki
"My words but a whisper -- your deafness a SHOUT.
I may make you feel but I can't make you think." - Thick as a Brick, Jethro Tull 1972

How to Chnage the Default Select bgcolor of the TreeView item

SimonS25-Feb-02 0:14

SimonS

25-Feb-02 0:14

James T. Johnson wrote:
if( c is System.Windows.Forms.TextBox )

That's a better way. Probably more robust too (if MS changes the text of class names).

Cheers,
Simon

X-5 452 rules.

Welson21-Feb-02 16:05

Welson

21-Feb-02 16:05

I would like to set owner bgcolor while the user select an item in the treeview.
how do i do the work Confused | :confused:

How do you create an object from a C++ DLL in C#

21-Feb-02 14:05

Hi,

I have a c++ DLL it contains a class called MyClass with methods GetName and SetName.

[DllImport("MyClass.dll")]
public static extern void GetName( string name);

This doesn't work because I need to instanciate the class.

How do I declare the class and methods within the class?

Then how do I instancial the class and call the method?

Thanks

Mike

Re: How do you create an object from a C++ DLL in C#

Nemanja Trifunovic21-Feb-02 14:52

Nemanja Trifunovic

21-Feb-02 14:52

No way to do this from C#. Either use MC++, or wrap your class into a COM object and the reference it from your code.

I vote pro drink Beer | [beer]

Playing sounds through c#

Profox Jase21-Feb-02 4:57

21-Feb-02 4:57

Hello helpers.

So far, my asteroids game is coming along nicely, and I am learning lots. Now has come the time to get c# to play some sounds - by searching around I have found this:

[DllImport("winmm.dll")]
public static extern long PlaySound(String lpszName, long hModule, long dwFlags);

This does is fact work, however, the keener amongst you will realise that code execution stops until this function returns a value. Of course, in my game, I don't want the game to freeze everytime I call this function, so, is there
a) another method for playing a sound file (I used a com object in Foxpro) and if so, can somebody tell me how to do it in C#
b) a way to call PlaySound without waiting for a return value?

Many thanks you gorgeous hamsters
Confused | :confused:

J

Jason King

jason.king@profox.co.uk
Feel the love at www.profox.co.uk

21-Feb-02 7:22

Use ASYNC flag that has a value 0x0001.

You can use enum to include other flags:

public enum PlaySoundFlag
{
// Play synchronously (default)
Synchronously = 0x0000,

// Play asynchronously
Asynchronously = 0x0001,

// Silence (!default) if sound not found
NoDefault = 0x0002,

// pszSound points to a memory file
Memory = 0x0004,

// Loop the sound until next sndPlaySound
Loop = 0x0008,

// Don't stop any currently playing sound
NoStop = 0x0010,

// Don't wait if the driver is busy
NoWait = 0x00002000,

// Name is a registry alias
Alias = 0x00010000,

// Alias is a predefined ID
AliasId = 0x00110000,

// Name is file name
Filename = 0x00020000,

// name is resource name or atom
Resource = 0x00040004,

// Purge non-static events for task
Purge = 0x0040,

// Look for application specific association
Application = 0x0080
}

Example:
PlaySound("c:\\windows\\media\\Windows XP Startup.wav",0,PlaySoundFlag.Filename|PlaySoundFlag.Asynchronously);

Should work

Jerzy

Peter Stephens21-Feb-02 7:42

21-Feb-02 7:42

Or you could use an Asynchronous method call or make your synchronous call on a different thread.

--
Peter Stephens

Profox Jase21-Feb-02 9:38

21-Feb-02 9:38

Thanks for the advice. I will try to figure out how to make an asynchronous call - I assume this would be different to the flags that Jerzy is talking about?

Thanks though, will look into it.

Jase

Jason King

jason.king@profox.co.uk
Feel the love at www.profox.co.uk

Peter Stephens21-Feb-02 9:56

21-Feb-02 9:56

Asynchronous calls in .NET use delegates. There are methods on a delegate called BeginInvoke and EndInvoke. I personally have not used async calls yet, but plan to do so soon. Smile | :)

AFAIK .NET async calls use a threadpool behind the scenes.

--
Peter Stephens

Profox Jase21-Feb-02 9:36

21-Feb-02 9:36

Thanks alot, that's a whole lot of detail. The example clinches it. You are the man Cool | :cool:

.

Cheers
J;)

Jason King

jason.king@profox.co.uk
Feel the love at www.profox.co.uk

Profox Jase22-Feb-02 0:37