C# Discussion Boards - CodeProject

11-Apr-06 6:33

I have set up a fireworks controller board involving shift register chips and relays. My output will be a serial binary number 48 bits long through the parallel port, each bit being outputted after one clock tick. The timer for C# seems to have a 1 millisecond limit as to its speed, but the hardware device I am writting to can switch in less than 50 nanoseconds. Is there some way to use a faster timer in C# or is there some access to the CPU's clock I can use? Thanks in advance
William Miller

leppie11-Apr-06 7:05

leppie

11-Apr-06 7:05

zotdoc wrote:
the hardware device I am writting to can switch in less than 50 nanoseconds.

I somehow doubt its nano, u sure its not micro (u)? Wink | ;)

xacc.ide-0.1.3.2

zotdoc11-Apr-06 9:19

11-Apr-06 9:19

That is what the spec sheet for the shift registers I am using says they will do, but who knows.

Steve Maier11-Apr-06 8:07

Steve Maier

11-Apr-06 8:07

You could use the multimedia timer instead of the Timer class.

http://www.codeproject.com/csharp/lescsmultimediatimer.asp[^]

Steve Maier, MCSD MCAD

zotdoc11-Apr-06 9:21

11-Apr-06 9:21

Hey thanks Steve, that was usefull!

zotdoc11-Apr-06 9:34

Getting the parent window of the ToolStripMenuItem

11-Apr-06 9:34

Thanks, that was usefull!

zaboboa11-Apr-06 6:06

zaboboa

11-Apr-06 6:06

Hello,

After the ToolStripMenuItem has been clicked, is there a way of getting the parent form that hosting the ToolStrip.

Thank you.

Re: Getting the parent window of the ToolStripMenuItem

_Bao_11-Apr-06 6:28

_Bao_

11-Apr-06 6:28

try the 'Owner' property.

Accessing Outlook in C#

ChuckBurris11-Apr-06 5:42

ChuckBurris

11-Apr-06 5:42

I have been working to extract new emails from an outlook identity (Help Desk) to display in a windows form and save to sql server. I can expose some methods and properties but cannot see a new mail item. Does anyone have any experience in this area. I have used automation before coming over to C#. Thanks for any ideas.

Chuck

Passing objects as parameters

adol_w11-Apr-06 5:11

adol_w

11-Apr-06 5:11

I wanted to pass an object instance to a a method in another class and execute one of its methods.
Is it possible to do this in C# ? (this example doesn't work):

<br />
class Write<br />
{<br />
	public void write()<br />
	{<br />
                // this is what I would run<br />
		Console.Writeline();<br />
	}<br />
}<br />
<br />
class app<br />
{<br />
	Write w = new write();<br />
	execute e = new execute(w);<br />
}<br />
<br />
class execute<br />
{<br />
	object a;<br />
	public execute(object o)<br />
	{<br />
		a = o;<br />
	}<br />
	<br />
	public void main()<br />
	{<br />
                // trying to run Write class method<br />
		a.write();<br />
	}<br />
}<br />
<br />

J4amieC11-Apr-06 5:16

J4amieC

11-Apr-06 5:16

2 options.

1) Cast before calling method:

public void main()
{
  // trying to run Write class method
  ((Write)a).Write();
}

2) Take correct typed input

class execute
{
  Write a;
  public execute(Write o)
  {
    a = o;
  }
}

adol_w11-Apr-06 5:40

adol_w

11-Apr-06 5:40

Thank you for answering. But what if I don't know the correct type? For example, I want to make class execute receive another object that also has a "write" method. Using cast I would have to make another class. I wanted to make this execute class generic enough so it would receive any object and execute its write method.

-- modified at 11:42 Tuesday 11th April, 2006

majed sultan11-Apr-06 6:25

majed sultan

11-Apr-06 6:25

You need to use interface

public interface IWrite()
{
void write();
}

public class myClass : IWrite
{
public void write()
{
Console.writeline("Hi");
}
}

sorry dont have VC# in this PC but u can search the web for interface

Leyu11-Apr-06 6:57

Leyu

11-Apr-06 6:57

<br />
<br />
public class BaseWriter<br />
{<br />
public virtual Write()<br />
{<br />
//Write What u want here<br />
}<br />
}<br />
<br />
public class FileWriter:BaseWriter<br />
{<br />
public override Write()<br />
{<br />
//Write to a file here<br />
}<br />
}<br />
<br />
public class XMLWriter:BaseWriter<br />
{<br />
public override Write()<br />
{<br />
//Write to XML file<br />
}<br />
}<br />
<br />
public class MainApp<br />
{<br />
<br />
public static void Main()<br />
{<br />
BaseWriter baseWriter1=new FileWriter(); <br />
BaseWriter baseWriter2=new XMLWriter();<br />
<br />
Writer(baseWriter1);<br />
Writer(baseWriter2);<br />
<br />
}<br />
<br />
public static void Writer(BaseWriter writer)<br />
{<br />
writer.Write();   //Writes for the correct writer<br />
}<br />
<br />
}<br />
<br />

Stefan Troschuetz11-Apr-06 7:12

Stefan Troschuetz

11-Apr-06 7:12

You could use reflection:

public execute(object o)
{
 MethodInfo methodInfo = o.GetType().GetMethod("write");
 if (methodInfo != null)
  methodInfo.Invoke(o, null);
}

www.troschuetz.de

adol_w11-Apr-06 8:43

adol_w

11-Apr-06 8:43

It seems reflection is the most apropriate for what I want to do. Thanks everyone for the suggestions.

DateTime

Brendan Vogt11-Apr-06 4:33

Brendan Vogt

11-Apr-06 4:33

Hi,

How does one assign a "no value" to a DateTime object. Assign it null won't work because it's a value type.

The reson why I ask is because I have a function, that would check a date value, if it is "no value", the return DBNULL.Value, or return the value of the string. This is for database insertion.

Currently I have the following:

DateTime objDOB;
if (txtYY.Text == string.Empty || txtMM.Text == string.Empty || txtDD.Text == string.Empty)
objDOB = new DateTime(1800, 01, 01); // Default "blank" date
else
objDOB = new DateTime(Int32.Parse(txtYY.Text), Int32.Parse(txtMM.Text), Int32.Parse(txtDD.Text));

I would have liked to change the objDOB = new DateTime(1800, 01, 01); to objDOB = null; but this is not going to work.

Can someone please advise me on what to do?

Regards,
ma se
(South Africa)

J4amieC11-Apr-06 4:35

J4amieC

11-Apr-06 4:35

I tend to use DateTime.MinValue instead of an arbitary "null" date like you have done.

Brendan Vogt11-Apr-06 4:44

Brendan Vogt

11-Apr-06 4:44

Thanks, I'll try it out.

darkelv11-Apr-06 5:17

darkelv

11-Apr-06 5:17

You can use SqlDateTime, it allows you to put a SqlDateTime.Null.

Rob Philpott11-Apr-06 6:45

Rob Philpott

11-Apr-06 6:45

Should you be using .NET 2.0, you can use nullable types. By declaring your variable of type DateTime? you can then assign it to null, and this seems to work pretty much transparantly through to databases.

I've found this very useful lately, and generally when I'm dealing with nullable databases columns I always use nullable types to represent the values within them in code - DBNULLs just disappear.

Regards,
Rob Philpott.