Simple program for USB joystick [modified] - C# Discussion Boards

CPallini28-Feb-07 9:44

CPallini

28-Feb-07 9:44

Please post the relevant code. Help us to help you.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

teejayem28-Feb-07 10:43

teejayem

28-Feb-07 10:43

Thank you for the reply. Below is what i have going on:

This is where i create the thread

m_objPrintThread = new PrintThread(m_objUV, this, m_sRecKey, m_DailyRec);
m_objPrintThreadID = new Thread(m_objPrintThread.ThreadStart);


m_objPrintThreadID.Start();

This is what is basically going in the thread. There are three functions I only put one in here to save space.

namespace CashRec
{
    public delegate bool PrintCashRec(); // Delegate

    class PrintThread
    {
        UONET m_objUV;
        string m_sKey, m_sRec;
        frmMain m_form;
        volatile bool m_bShouldStop = false;       
 
        public PrintCashRec m_PrintRec;

        public PrintThread(UONET objUV, frmMain form, string sKey, string sRec)
        {
            m_form = form;
            m_objUV = objUV;
            m_sKey = sKey;
            m_sRec = sRec;
            m_PrintRec = new PrintCashRec(Print);
        }

        public void ThreadStart()
        {
            while (!m_bShouldStop)
            {
                Thread.Sleep(500);
            }
        }

        public void ThreadStop()
        {
            m_bShouldStop = true;
        }

        private Boolean Print()
        {
            bool bSuccessful = false;

            while (!bSuccessful)
            {
                  // Logic Here
            }

            return bSuccessful;
        }

Here basically i am calling the delegate and i would expect it to just signal the thread to call the print function without it hanging the main form. But it still hangs the form.

private void mnuPrint_Click(object sender, EventArgs e)
{
    if (m_objPrintThread == null)
    {
        if (StartPrintThread())
            m_objPrintThread.m_PrintRec;
    }
    else
        m_objPrintThread.m_PrintRec;
}

Thanks again for your help

Don't be overcome by evil, but overcome evil with good

CPallini28-Feb-07 11:18

CPallini

28-Feb-07 11:18

As a quick answer, it seems to me that you are calling a not-threaded method, while the threded one does nothing (only sleeps). But I'm in hurry hence I can't give a better look at your code. Maybe tomorrow you'll get a better answer.

Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

pbraun4-Mar-07 4:24

pbraun

4-Mar-07 4:24

Is the objective of your code to display a record to a control on the main form? If so you need a different approach to the problem so check out the InvokeRequired property of forms.

Phil

teejayem5-Mar-07 12:35

teejayem

5-Mar-07 12:35

what the thread does is prints documents to a printer. Reason why i have it in a thread is it builds the record to print. If i did this on the main thread it would lock up the GUI for about 10/20 seconeds which is would make the user think that the program is locking up. What i did as a work around is create 3 flags in the thread. Every 1 seconed it will loop and check for those flags and if one is true it will do the function that corresponds to that flag. It does work fine but i don't think it is the right approach.

Thanks for the reply,

Don't be overcome by evil, but overcome evil with good

Simple program for USB joystick [modified]

pbraun5-Mar-07 13:41

pbraun

5-Mar-07 13:41

In that case, my preference would be to do the following:

Create a queue of some type (Look up "Queue") to which the records to be printed will be added. Also create an auto reset event that can be signaled each time a record is added to the queue. Finally, create and start the print thread.

When the user wants to print, the print process can queue the record and signal the auto reset event that there is a record to print.

The print thread should do the following:

In a loop the thread must wait until signaled.
Check if the application is shutting down and if so, exit the loop.
In a loop, inside the loop mentioned above, pop the first record off the queue and print it until there are no more records in the queue to print.

Of course you will have to lock the queue when adding records and also when popping the records off for printing so that the queue does not get corrupt.

This will allow the printing to occur in a separate thread from the GUI thread which will allow the GUI to respond to user input.

Phil

MP3 in memorystream

neurobion28-Feb-07 6:38

neurobion

28-Feb-07 6:38

Hi all,

i have a problem, i need playing mp3 from stream (stream nor mp3 file from my hdd) but i dont now how .

I hope anybody can help me with this problem.

quwip1028-Feb-07 6:37

quwip10

28-Feb-07 6:37

I am trying to create a simple I/O program for use with a usb joystick I have. I want it to just respond by showing what input it is receiving, for example displaying "A" if the "A" button is pressed or displaying "up left" if the joystick is held up left. I just need a little help getting started. I am using Visual C# 2005, so if anyone knows how to do this, I would sure appreciate it.

ALEX

-- modified at 13:38 Wednesday 28th February, 2007

Re: Simple program for USB joystick

Wayne Phipps28-Feb-07 8:43

Wayne Phipps

28-Feb-07 8:43

This *may* be of interest....

http://www.lvr.com/hidpage.htm

and this

http://www.sharpdevelop.net/OpenSource/SharpUSBLib/default.aspx

I say *may* because I have never attempted this myself although found the concept of interest.

Hope it helps

Regards

Wayne Phipps
____________

Time is the greatest teacher... unfortunately, it kills all of its students
View my Blog

Re: Simple program for USB joystick

quwip101-Mar-07 6:07

quwip10

1-Mar-07 6:07

Thank you I will look into these sites.

Re: Simple program for USB joystick

Dave Kreskowiak1-Mar-07 2:24

Dave Kreskowiak

1-Mar-07 2:24

The easiest way is to use DirectX and it's DirectInput subsystem.

Dave Kreskowiak
Microsoft MVP - Visual Basic

return generic collection from webservice

arkiboys28-Feb-07 6:01

28-Feb-07 6:01

Webservice returns a method of generic collection type i.e. List<marketvaluetypes.forward>
i.e:
[WebMethod()]
public List<marketvaluetypes.forward> MarketValuesForwardsGet(int intMarketValueTypeID, int intIndexID, DateTime dtDateValue)
{
try
{
return Business.MarketData.MarketValuesForwardsGet(intMarketValueTypeID, intIndexID, dtDateValue);
}

catch
{
throw;
}
}

from the client side i.e. form, I would like to retrieve the collection. This is what I am doing

private void btnMarketValues_Click(object sender, EventArgs e)
{
List<marketvaluetypes.forward> forwards = null;

int intMarketValueTypeID = int.Parse(cboMarketValueTypes.SelectedValue.ToString());
int intIndexID = int.Parse(cboIndices.SelectedValue.ToString());
DateTime dtDateValue = DateTime.Parse(dtpValueDate.Value.ToShortDateString());

private MarketDataService.MarketData wsMarketData;
wsMarketData = new MarketDataService.MarketData();

//this line gives the error
forwards = wsMarketData.MarketValuesForwardsGet(intMarketValueTypeID, intIndexID, dtDateValue);
//

foreach (MarketValueTypes.Forward f in forwards)
{

}
}

The error message is:
Cannot implicitly convert type 'MarketDataService.Forward[]' to 'System.Collections.Generic.List<marketvaluetypes.forward>'

Thanks

kubben28-Feb-07 6:06

28-Feb-07 6:06

I think you need to read up a little more on generic lists. The defination of a generic list would look like:
List<forward>

You are passing back an array of Forward which is not an generic list. So if you change your List to a List<forward> you will at least be in a little better shape. I have not tried to return a generic list in a web service, so I am not sure what issue may come from that. I know that what ever is returned from a web service needs to be serializeable.

Anyway, hope that helps.
Ben

arkiboys28-Feb-07 6:23

28-Feb-07 6:23

Could you please let me know exactly where/what to change this in the code please? i.e. please modify the code.
Thanks

kubben28-Feb-07 6:25

28-Feb-07 6:25

You don't have all your code listed so I won't be able to make all the changes, but the webmethod should look like this:
[WebMethod()]
public List<forward> MarketValuesForwardsGet(int intMarketValueTypeID, int intIndexID, DateTime dtDateValue)
{
try
{
return Business.MarketData.MarketValuesForwardsGet(intMarketValueTypeID, intIndexID, dtDateValue);
}

catch
{
throw;
}
}

Assuming that your generic collection is of type Forward.

In your MarketValuesForwardsGet you will need to return a List<forward> as well.

Ben

arkiboys28-Feb-07 6:27

28-Feb-07 6:27

Apologiese but I think I am doing just that.
may be I am not following you correctly.
Is there anything else from the code you would like me to send you?
Thanks

kubben28-Feb-07 6:30

28-Feb-07 6:30

Sorry I didn't do the <> signs right so they were removed from my previous post.

You don't have all your code listed so I won't be able to make all the changes, but the webmethod should look like this:
[WebMethod()]
public List<Forward> MarketValuesForwardsGet(int intMarketValueTypeID, int intIndexID, DateTime dtDateValue)
{
try
{
return Business.MarketData.MarketValuesForwardsGet(intMarketValueTypeID, intIndexID, dtDateValue);
}

catch
{
throw;
}
}

Assuming that your generic collection is of type Forward.

In your MarketValuesForwardsGet you will need to return a List<Forward> as well.

Ben

arkiboys28-Feb-07 6:32

28-Feb-07 6:32

But this is exactly what I have in the webservice as i explained in the first post. Am I not right?
Thanks

kubben28-Feb-07 6:35

28-Feb-07 6:35

Perhaps the <Forward> was removed from your orignal post as well?

List
is not the same as
List<Forward>

You error message that you are getting is this:
MarketDataService.Forward[]

That is an array of Forward, not

List<Forward> which is a generic collection.

Sorry about the confusion.

Ben

arkiboys28-Feb-07 6:38

28-Feb-07 6:38

Ok, this is what I have:
[WebMethod(Description = "Get MarketValues for ForwardCurves")]
public List<forward> MarketValuesForwardsGet(int intMarketValueTypeID, int intIndexID, DateTime dtDateValue)
{
try
{
return Business.MarketData.MarketValuesForwardsGet(intMarketValueTypeID, intIndexID, dtDateValue);
}

catch
{
throw;
}
}

in the form:
private void btnMarketValues_Click(object sender, EventArgs e)
{
List<forward> forwards = null;

int intMarketValueTypeID = int.Parse(cboMarketValueTypes.SelectedValue.ToString());
int intIndexID = int.Parse(cboIndices.SelectedValue.ToString());
DateTime dtDateValue = DateTime.Parse(dtpValueDate.Value.ToShortDateString());
//error here////
forwards = wsMarketData.MarketValuesForwardsGet(intMarketValueTypeID, intIndexID, dtDateValue);
///

foreach (Forward f in forwards)
{

}
}

kubben28-Feb-07 6:42

28-Feb-07 6:42

When you posted this did you click the Ignore HTML tags in this message check box at the bottom? If you didn't please check it and post your code again.

Thanks,
Ben

arkiboys28-Feb-07 6:44

28-Feb-07 6:44

Hi,
Here it is again. thanks

[WebMethod(Description = "Get MarketValues for ForwardCurves")]
public List<Forward> MarketValuesForwardsGet(int intMarketValueTypeID, int intIndexID, DateTime dtDateValue)
{
try
{
return Codex.Business.MarketData.MarketValuesForwardsGet(intMarketValueTypeID, intIndexID, dtDateValue);
}

catch
{
throw;
}
}

code in the form:
private void btnMarketValues_Click(object sender, EventArgs e)
{
List<Forward> forwards = null;

int intMarketValueTypeID = int.Parse(cboMarketValueTypes.SelectedValue.ToString());
int intIndexID = int.Parse(cboIndices.SelectedValue.ToString());
DateTime dtDateValue = DateTime.Parse(dtpValueDate.Value.ToShortDateString());

//error///
forwards = wsMarketData.MarketValuesForwardsGet(intMarketValueTypeID, intIndexID, dtDateValue);
///erorr
foreach (Forward f in forwards)
{

}
}

arkiboys28-Feb-07 6:46

28-Feb-07 6:46

hi, here it is. thanks
[WebMethod(Description = "Get MarketValues for ForwardCurves")]
public List<Forward> MarketValuesForwardsGet(int intMarketValueTypeID, int intIndexID, DateTime dtDateValue)
{
try
{
return Business.MarketData.MarketValuesForwardsGet(intMarketValueTypeID, intIndexID, dtDateValue);
}

catch
{
throw;
}
}

code in the form:
private void btnMarketValues_Click(object sender, EventArgs e)
{
List<Forward> forwards = null;

int intMarketValueTypeID = int.Parse(cboMarketValueTypes.SelectedValue.ToString());
int intIndexID = int.Parse(cboIndices.SelectedValue.ToString());
DateTime dtDateValue = DateTime.Parse(dtpValueDate.Value.ToShortDateString());

forwards = wsMarketData.MarketValuesForwardsGet(intMarketValueTypeID, intIndexID, dtDateValue);

foreach (Forward f in forwards)
{

}
}

mike montagne28-Feb-07 8:32

mike montagne

28-Feb-07 8:32

The problem here does not appear to be with your forwards generic declaration, but with your foreach iteration. f is an instance of forwards, and you are trying to process f as if it is the outer container.

arkiboys28-Feb-07 21:52