Re: GDI+ Gradients - C# Discussion Boards

Anybody else having problems with arrow keys

theDexter11-Mar-05 9:08

11-Mar-05 9:08

When using the KeyDown event of the form, every key works fine except for the arrow keys (they are inconsistent at best).

The KeyUp event works great, so I am moving some code I wanted to put into the KeyDown event there.

I have tried the same code on several computers, with the same results.

Any ideas???

Thanks

adding item to default menu on windows form

asayyam Khan11-Mar-05 8:11

asayyam Khan

11-Mar-05 8:11

hi all

hey can anyone tell me how i can add item in the dropdown menu which opens when a right click occur at design time on a control on a windows form ...i just want to able to open property page for that control ..by clicking on the item in menu .......

waiting for relpy any one .......

asayyam

Re: adding item to default menu on windows form

Pooria Madani11-Mar-05 16:23

Pooria Madani

11-Mar-05 16:23

When u Adding DropDown menu to your Forum , Add that in the Below of your form when you Click On it you can adding Item and Cahnge that Propaerty

ipconfig commands in C#

Vodstok11-Mar-05 6:07

Vodstok

11-Mar-05 6:07

I am about ready to stab myself with a screwdriver i am so frustrated with this....

I have been playing around with WMI for a day now, and have had great luck retrieving information using it. However, I noticed that the "Win32_NetworkAdapterConfiguration" class has a method for releasing and renewing IP addresses. Now, i know this is somehting i can do from a command line easily enough, but i am trying to build an app that will let people that are more or less hopeless when it comes to command line programs perform this very simple procedure. i have been using this so far, but keep getting errors:

<br />
			ManagementObject mo = new ManagementObject("Win32_ComputerSystem.Name='" + inf.Machine() + "'", opt);<br />
<br />
<br />
			object[] ar = {"ReleaseDHCPLeaseAll"};<br />
			mo.InvokeMethod("ReleaseDHCPLeaseAll",ar);

inf.Machine() is a string method i am using to get the machine name.

______________________
Yes, I am the highly suggestable type. WTF | :WTF:

Re: ipconfig commands in C#

Dave Kreskowiak11-Mar-05 7:12

Dave Kreskowiak

11-Mar-05 7:12

You never said what the error message was, nor on what line it occurs!

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

GDI+ Gradients

C Flat11-Mar-05 5:50

C Flat

11-Mar-05 5:50

Hi,
Im writing a windows form in c# to produce little background gradients of various colours for another program. I have tried hundreds of ways to prouce these images, using greyscale templates, sigmaBell gradients, blends however i cant produce what i need.. i can come close, but not close enough..

Does anyone have any tips or knowledge which may help?

The images look like this

Thanks,

Re: GDI+ Gradients

TylerBrinks11-Mar-05 6:05

TylerBrinks

11-Mar-05 6:05

Put a panel on a form named panel1. Use this method for the panel's paint event.

private void panel1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
    using(LinearGradientBrush lgb = new LinearGradientBrush(e.ClipRectangle, Color.White, Color.Silver, LinearGradientMode.Vertical)){
        lgb.SetSigmaBellShape(0.5F, 0.7F);
        e.Graphics.FillRectangle(lgb, e.ClipRectangle);
    }
}

Re: GDI+ Gradients

C Flat11-Mar-05 6:31

C Flat

11-Mar-05 6:31

WOW... you really know you GDI+, that was exactly what i was looking for. Ive tried the SigmaBellShape before but i think my floats really messed it up.. What does the using keyword do? ive never seen it used this way before, only at the start of the class to 'include' various assemeblies.

Re: GDI+ Gradients

TylerBrinks11-Mar-05 7:11

TylerBrinks

11-Mar-05 7:11

The using statement, in theory, is like a try/finally block all wrapped up. Any object you declare within the using statement will be disposed as soon at it is out of scope (i.e. execution exits the using statement). You can also stack multiple using statements in order to dispose multiple objects. It's less code than a try/finally and is more elegant in my opinion. If you want more details look up the keyword on MSDN.

Re: GDI+ Gradients

Judah Gabriel Himango11-Mar-05 6:06

Judah Gabriel Himango

11-Mar-05 6:06

Have you looked at System.Drawing.Drawing2D.LinearGradientBrush?

Tech, life, family, faith: Give me a visit.
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Judah Himango

Re: GDI+ Gradients

MoustafaS11-Mar-05 8:00

MoustafaS

11-Mar-05 8:00

itis easy this way but if u want more efficient UI try using the PathGradientBrush at System.Drawing.Drawing2D namespace it is really cool and u can do somethings which will look like a 3-D shape it is really cool Smile | :)

ByMindOnlyYouCanDoIt

Re: GDI+ Gradients

C Flat13-Mar-05 7:31

C Flat

13-Mar-05 7:31

Thanks guys,

A lot of good info there.. ive decided im going to buy a book on GDI+ as it looks very interesting..

Another question,

im having a lot of trouble in c# trying to copy a folder to a new locaton along with all its files and subdirectories. I can move it no problem but not copy it..

Any hints or guidance?

(I like to work the whole solutions out myself, using just hints if needs be)

Another thread question

PaleyX11-Mar-05 2:54

PaleyX

11-Mar-05 2:54

My app was never designed to support threading - The GUI has a VB6 front end but I have rewritten it in VB.NET with a C# backend - don't ask WTF | :WTF:

Some of the operations in the C# back end can take a long time are thus good candidates for running on a worker thread - these operations communicate back to the GUI using events - status information, adding rows to a datagrid, progress bar etc.

As I am new to threads in .NET can I still use the events from the function running on the worker thread but just change the event sinks so they use BeginInvoke to update the GUI controls?

The class which contains the long running operations has some database code in it - can I call that code from the long running operation on the new thread just as I would if it wasn't running on the thread? I don't believe I have any synchronisation issues as the database is always read only - the only reason I want the long running operation to run on a separate thread is so the GUI remains responsive, I dont actually intend to let the user do anything with the GUI other than maybe cancel the long running operation.

TIA

Re: Another thread question

PaleyX11-Mar-05 2:55

PaleyX

11-Mar-05 2:55

Sorry, posted it twice - the first attempt too 20 minutes then went blank - when I looked it wasn't there so I reposted it - naturally the first one decided to appear in the meantime Mad | :mad:

Rugby League: The Greatest Game Of All.

Re: Another thread question

TylerBrinks11-Mar-05 4:51

TylerBrinks

11-Mar-05 4:51

Multithreading w/ a GUI on MSDN

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnforms/html/winforms06112002.asp[^]

Re: Another thread question

PaleyX11-Mar-05 5:18

PaleyX

11-Mar-05 5:18

Thanks, I have read those articles and also in his book on Windows Forms programming where the articles are repeated. They don't really address my events question though.

Re: Another thread question

TylerBrinks11-Mar-05 5:56

TylerBrinks

11-Mar-05 5:56

Yes, you can still use evens. The article details exactly how to do it in terms of your GUI. First, subscribe to the events or use a delegate which points to your GUI's method. Either way will work fine. Your thread will call it's delegate or raise its event, and the UI thread will receive the notification.

In your gui you'll need code similar to this to handle the event:

private delegate void uiThreadDelegate(object sender, EventArgs e);

protected void MyEventHandler(object sender, EventArgs e)
{
    if(this.InvokeRequired)
    {
        uiThreadDelegate ui = new ThreadDelegate(MyEventHandler);
        this.BeginInvoke(ui, new object[]{sender, e});
    }else{
        ... your code
    }
}

Amother thread question

PaleyX11-Mar-05 2:48

PaleyX

11-Mar-05 2:48

My app was never designed to support threading - The GUI has a VB6 front end but I have rewritten it in VB.NET with a C# backend - don't ask WTF | :WTF:

Re: Amother thread question

turbochimp11-Mar-05 16:18

turbochimp

11-Mar-05 16:18

There's a very good basic article here[^] that will probably cover most of the bases for you. It's a time saver if you don't want to reinvent the wheel with respect to UI <-> worker thread interaction.

Hope this helps.

The most exciting phrase to hear in science, the one that heralds the most discoveries, is not 'Eureka!' ('I found it!') but 'That's funny...’

Reloading a webform page

3Dizard11-Mar-05 2:40

3Dizard

11-Mar-05 2:40

Hi,
I'm completely new to this theme and I have the following problem: I want to reload the page via code like a serverside button does (PostBack event should be triggered), when beeing clicked. So, how can i achieve that?
Till now I didn't find any proper function looking in the System.Web.UI.Page class and using the meta tag <meta http-equiv="refresh" content="10"> reloads the site but triggers no PostBack event.

Thanks.

BTW: I'm using webforms and c#

Re: Reloading a webform page

DavidNohejl11-Mar-05 7:10

DavidNohejl

11-Mar-05 7:10

hi,
you can cause postback with JS:

var form = document.getElementById(formID)
form.submit;

This will have same effect like user hitting submit button.

best regards,
David 'DNH' Nohejl

Never forget: "Stay kul and happy" (I.A.)

Re: Reloading a webform page

turbochimp11-Mar-05 16:26

turbochimp

11-Mar-05 16:26

How do you plan to trigger this reload? Is it the result of a button press or ??

If it's the result of a button press (running at the server), then chances are the page is already posting back (unless you've changed the default behavior of the button).

If you're trying to do it from the client side, then you're most likely going to have to use script, as the previous post suggests, unless you're using one of the Html controls that includes a ServerClick event.

The most exciting phrase to hear in science, the one that heralds the most discoveries, is not 'Eureka!' ('I found it!') but 'That's funny...’

Re: Reloading a webform page

turbochimp11-Mar-05 16:27

turbochimp

11-Mar-05 16:27

BTW, this question really belongs in the ASP.Net forum, not this one.

The most exciting phrase to hear in science, the one that heralds the most discoveries, is not 'Eureka!' ('I found it!') but 'That's funny...’

Tooltip on a Combo Box

Member 62119111-Mar-05 2:07

Member 621191

11-Mar-05 2:07

Hi,

I want to display tooltip with Item Name when mouse is hovered on a combo box items , i have done it for ListBox, but i can not able to do the same for Combo in Windows Forms using C#.

if u have any suggestions or code samples please send it to my mail.

thaking you,
shyam

Socket Comms and a Web Browser Cntrl

Chris Ulliott11-Mar-05 1:29

Chris Ulliott

11-Mar-05 1:29

Hi All,

A quick question. I am writing a C# application which uses Windows Sockets to create peer to peer chatting capability.

I connect the sockets up like this:

private void BeginConnectToServersThread()<br />
{<br />
	String strIP;<br />
	for(int nServer=0; nServer < listServers.Items.Count; nServer++)<br />
	{<br />
		strIP = listServers.Items[nServer].SubItems[1].Text;<br />
		if(strIP != "")<br />
		{<br />
			try<br />
			{<br />
				m_socClient = new Socket (AddressFamily.InterNetwork,SocketType.Stream ,ProtocolType.Tcp );<br />
				// get the remote IP address...<br />
				IPAddress ip = IPAddress.Parse(strIP);<br />
				int iPortNo = 8221;<br />
				//create the end point<br />
				IPEndPoint ipEnd = new IPEndPoint(ip.Address,iPortNo);<br />
				//connect to the remote host...<br />
				m_socClient.Connect( ipEnd );<br />
				//watch for data ( asynchronously )...<br />
				WaitForData();<br />
			}<br />
			catch(ObjectDisposedException)<br />
			{<br />
				System.Diagnostics.Debugger.Log(0,"1","\n OnClientConnection: Socket has been closed\n");<br />
			}<br />
			catch(SocketException se)<br />
			{<br />
				MessageBox.Show ( se.Message );<br />
			} <br />
		}<br />
	}<br />
}<br />
<br />
public void WaitForData()<br />
{<br />
	if ( pfnCallBack == null )<br />
		pfnCallBack = new AsyncCallback (OnDataReceived);<br />
	// now start to listen for any data...<br />
	m_asynResult = <br />
		m_socClient.BeginReceive (m_DataBuffer,0,m_DataBuffer.Length,SocketFlags.None, pfnCallBack,null);<br />
}<br />
<br />
public void OnDataReceived(IAsyncResult asyn)<br />
{<br />
	//end receive...<br />
	int iRx = 0 ;<br />
	iRx = m_socClient.EndReceive (asyn);<br />
	char[] chars = new char[iRx + 1];<br />
	System.Text.Decoder d = System.Text.Encoding.UTF8.GetDecoder();<br />
	int charLen = d.GetChars(m_DataBuffer, 0, iRx, chars, 0);<br />
	System.String szData = new System.String(chars);<br />
	ProcessIncommingMessage(szData);<br />
	WaitForData();<br />
}

This all works fine at the moment with a low number of servers and clients. My problem is that I also have a Web Browser control added on another form which is active at the same time as the form containing my Windows Sockets code.

Why is this a problem? Because whilst the sockets code tries to connect to existing servers (If they dont exist it can take a while before they timeout) with the m_socClient.Connect( ipEnd ) function, my Web Browser never gets to navigate to the URL I have asked it to go to!! It just sits there as if waiting for the socket connections to connect first. HMPH. I dont even get a "Page cannot be displayed", it just shows nothing at all.

If however I comment out the sockets code where it tries to connect, then the Web Browser works absolutly fine.

Any ideas why this is happening and how I can make them both work together? If you require more information then please just ask.

Thank you in advance,

Chris

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