I thought the TCP socket will take care of the reliability part
between TWS and your client. Besides they are on the same local
host, so the only chance is buffer overflow, and that should be
taken care of by the TCP protocal.

Now regarding the internect connection with IB, do you actually
experienced such disconnection causing the client blocked in the
middle of a message? Would be very interested to learn the patterns
of "always where" it is blocked.

Anyway, I am very interested in your investigations. And if enough
of us C++ users find this group too irrelevent to our project, then
we should form our own group.

I thought the TCP socket will take care of the reliability part
between TWS and your client. Besides they are on the same local
host, so the only chance is buffer overflow, and that should be
taken care of by the TCP protocal.

Now regarding the internect connection with IB, do you actually
experienced such disconnection causing the client blocked in the
middle of a message? Would be very interested to learn the patterns
of "always where" it is blocked.

In my app I modified IB's code a bit - still using MFC though - but
does it in the burst mode, so that it doesn't have to call those
readInt or ReadFloat all the time. I also recongnize the possibility
that the available data in the socket may not be null terminated. So
by pulling them to a much larger buffer locally and having a macro
parsing through the buffer for readInt and readFloat I greatly
reduce the chance of blocking in the middle of a message. But I
admit I don't have a mechanism in place to deal with when such an
event actually happens, which could be caused by the internet
problem for example.

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As for your specific situation of monitoring the connection to

is no heartbeat as far as I can tell. I know if I don't send

TWS the connection will be idle for over a minute. In essence TWS

talks the client in response to client requests. If you don't ask

anything you won't receive anything from the server (TWS). For

would have to do your own fake heartbeat by making a request for

harmless and looking for a reply.

I is also don't think it's possible to recover from any

problems on the socket due to the way data is sent from the

send a bunch of null-terminated strings for each logical record.

are10 fields in a record then you read 10 "lines" from the

is no header info with the number of lines or total length of the
packet. All you can do is time out if you don't get all 10 lines,

if any more data does arrive you don't know if it's the remaining

the previous packet or a new packet altogether. At this point a

fatal and you would have to close the connection and try to re-

I'm just starting my investigation and this is what I have found

far. If you are interested I can keep you posted on what I find

along. I'm not sure I will stay subscribed to this group as the

of messages appear to be VB programming questions.

Anyway, I hope this little bit of info is helpful.

- Nick

I'm VERY interested in hearing your success/problem stories of
rolling a new wrapper yourself.

I is also don't think it's possible to recover from any

problems on the socket due to the way data is sent from the

I'm not sure I will stay subscribed to this group as the dominance
of messages appear to be VB programming questions.

Anyway, I hope this little bit of info is helpful.

I am curious if anybody has come up with ways of doing real time
validation of the connection between TWS and IB. When using the
demo, our experience in this area was 'not good'. If I pull the plug
on the TWS connection at the firewall, it goes into a cycle of trying
to log back in, but never gives any kind of error indication to the
client application. I've kludged together a bit of an indication by
monitoring the bid/ask on the nq contract, basically we work on the
assumption that if there have been no updates for 30 seconds on the
nq, then it's likely the connection to IB is dead. The other option
we looked at, was a pinger thread, but that only verifies the network
connection, doesn't verify that TWS is indeed connected and live.

I'm new here, read the posts from back to the start to 'catch up'.
I'm curious about one thing, is everybody here using VB, or are any
of you using anything more powerful for this application ?

I started our first project utilizing the API a couple weeks ago,

have delivered 'first prototype' to the customer already. Our
experience to date is 'if the api worked as documented' it would

been a lot easier, and if the api didn't have serious concurrency
issues, it would have been almost trivial. We are working with

api in C++ and integrating it as 'another platform' into a larger
system that's been in production with other brokers for years.

I am curious if anybody has come up with ways of doing real time
validation of the connection between TWS and IB. When using the
demo, our experience in this area was 'not good'. If I pull the

on the TWS connection at the firewall, it goes into a cycle of

to log back in, but never gives any kind of error indication to the
client application. I've kludged together a bit of an indication

monitoring the bid/ask on the nq contract, basically we work on the
assumption that if there have been no updates for 30 seconds on the
nq, then it's likely the connection to IB is dead. The other

we looked at, was a pinger thread, but that only verifies the

connection, doesn't verify that TWS is indeed connected and live.

Has anybody else been contemplating this problem ?

Bruce,?

I put it in the files section in a special folder for VB control Demos

Go there or download it here:?

?

Hi Scott,

I am having a bit of trouble getting this to work.

Private Sub UpDown1_Change()

End Sub

WHat do I need to put in between the above code to

called txtContracts.

Thanks,

Bruce
----- Original Message -----
From: scott whitney
To: twsapi@y...
Sent: Saturday, July 13, 2002 8:14 AM
Subject: Re: twsapi: Spin buttons?


Spin buttons (Up Down Control) can be found in the components

Very handy little critters....

I have found something I like even more. If the Text Box is

You empty the combo list and repopulate it with a suitable range,

Here is the code I use to stuff the box on GotFocus

For dblTemp = dblSnag + (20 * tickStep) To dblSnag - (20 *

cmbPoints(Index).AddItem Format(dblTemp, "0.00")
If dblTemp = 0 Then Exit For
Next dblTemp

Here is the code I use to loop the box and pin the list:

snag = cmbPoints(Index)
With cmbPoints(Index)
For iTemp = 0 To .ListCount - 1
If .List(iTemp) = snag Then
.ListIndex = iTemp
Exit For
End If
Next iTemp
End With


The user doesnt know its a combo box, but he can use it as a text

Image

Very kewl. Take a look at the attached image, and what appear to

In my case the user can give focus to the center box, and roll

I find it far more intuitive and quicker than heck.

Scott




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If You Need More Help Just Hollar. I have an UP DOWN sample project if you need it...

The UpDown Control

The UpDown control offers a simple but effective way to create those spin buttons that many Windows applications display to the right of numeric fields and that let users increment or decrement a field's value using mouse clicks. While it's a trivial matter to create such spin buttons yourself?using a tiny VScrollBar control, for example, or using two smaller buttons with Style = 1-Graphical?the UpDown control offers many advantages and is far easier to set up and use than any other solution.

The most intriguing characteristic of the UpDown control is that you can link it to another control?its buddy control?at design time, and you can even select which particular property of the buddy control is affected by the UpDown control. Add to this the ability to set the scrolling range and the increment, and you see that in most cases you don't even need to write code to make everything work as expected.

Setting Design-Time Properties

In the General tab of an UpDown control, you typically set the Alignment property, which determines where the UpDown control has to align with respect to its buddy control. (The values are 0-cc2AlignmentLeft and 1-cc2AlignmentRight.) In this tab, you also set the Orientation property (0-cc2OrientationVertical or 1cc2OrientationHorizontal). The Orientation property can be set only at design time and is read-only at run time.

You select the buddy control in the Buddy tab of the Property Pages dialog box. (See Figure 11-2.) You can either type the control's name in the first field or tick the AutoBuddy check box. In the latter case, the UpDown control automatically selects the previous control in the TabIndex sequence as its buddy control. After you've selected a buddy control, two other fields on the Property Pages dialog box become available. In the BuddyProperty combo box, you select which property of the buddy control is affected by the UpDown control. (If you don't select any, the buddy control's default property is used.) You can set the SyncBuddy property to True, which causes the UpDown control to automatically modify the selected property in its buddy control.

You usually select a TextBox control as the buddy control of an UpDown control and Text as the buddy property. But nothing prevents you from connecting an UpDown control to other properties (for example, Left or Width) exposed by other types of controls. You can't use lightweight windowless controls as buddy controls, however.

Figure 11-2. The Buddy tab of the Property Pages dialog box of an UpDown control lets you select the buddy control and the buddy property.

Finally, in the Scrolling tab of the Property Pages dialog box, you select the UpDown control's Min and Max properties, which identify the valid range for the Value property. The Increment property is the value that's added to or subtracted from the Value property when the user clicks on the UpDown control's spin buttons. If the Wrap property is set to True, the Value property wraps when it reaches the Min or Max value.

Run-Time Operations

If the UpDown control's SyncBuddy property is set to True, you don't need to write any code to manually change the property in the buddy control. There are cases, however, when you can't rely on this simple mechanism. For example, the UpDown control might have no buddy controls or perhaps it's supposed to affect multiple controls or multiple properties of the same control. (For example, you might need to enlarge or shrink another control by affecting its Width and Height properties at the same time.) In such cases, all you have to do is write code inside the Change event procedure, as you would do for a scroll bar control.

The UpDown control exposes two custom events that give you even more flexibility: The DownClick and UpClick events, which fire when the mouse is released (that is, after the Change event) on either one of the buttons that make up the UpDown control. These events fire even if the Value property has already reached its Min or Max, which makes DownClick and UpClick events useful when you don't want to enforce a limit to the range of valid values:

?

' Move all controls on the form pixel by pixel.
Private Sub UpDown1_DownClick()
    Dim ctrl As Control
    For Each ctrl In Controls
        ctrl.Top = ctrl.Top + ScaleY(1, vbPixels, vbTwips)
    Next
End Sub
Private Sub UpDown1_UpClick()
    Dim ctrl As Control
    For Each ctrl In Controls
        ctrl.Top = ctrl.Top - ScaleY(1, vbPixels, vbTwips)
    Next
End Sub

All the properties that you set at design time can also be modified at run time through code, with the exception of the Orientation property. For example, you can change the buddy control and the buddy property using this code:

?

Set UpDown1.BuddyControl = Text2
UpDown1.BuddyProperty = "Text"

The BuddyControl property can also be assigned the name of the buddy control, for example:

?

UpDown1.BuddyControl = "Text2"
' This syntax even works with items of control arrays.
UpDown1.BuddyControl = "Text3(0)"

When you change the buddy control at run time, the UpDown control automatically moves to a position beside its buddy control, which shrinks to make room for the UpDown control.

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I tried your TradeGaurd but still unable to grasp the benefits of

What additionals features and benefits your platform provides

----- Original Message -----
From: traderguard
To: twsapi@y...
Sent: Friday, July 12, 2002 10:18 PM
Subject: twsapi: Authomated Trading for TWS


TraderGuard ver. 3.00.b02 for IB TWS NQ and ES has been released
today.

I am uploading it to file area in TWS API. I hope everyone who
want to download it will be able to get it from there.

Some features I want to mention are authomated trailing stops,
authomated exits from bad trade, risk monitoring. Also i like 1

to fill orders or reverse position.. no confirmation, no
transmit..saves time a lot.

another link to download is:


if you want to read about it go to:


Let me know what do you think



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Awesome thanks so much Scott
----- Original Message -----
From: scott whitney
To: twsapi@y...
Sent: Saturday, July 13, 2002 8:14 AM
Subject: Re: twsapi: Spin buttons?


Spin buttons (Up Down Control) can be found in the components

Very handy little critters....

I have found something I like even more. If the Text Box is

You empty the combo list and repopulate it with a suitable range,

Here is the code I use to stuff the box on GotFocus

For dblTemp = dblSnag + (20 * tickStep) To dblSnag - (20 *

cmbPoints(Index).AddItem Format(dblTemp, "0.00")
If dblTemp = 0 Then Exit For
Next dblTemp

Here is the code I use to loop the box and pin the list:

snag = cmbPoints(Index)
With cmbPoints(Index)
For iTemp = 0 To .ListCount - 1
If .List(iTemp) = snag Then
.ListIndex = iTemp
Exit For
End If
Next iTemp
End With


The user doesnt know its a combo box, but he can use it as a text

Image

Very kewl. Take a look at the attached image, and what appear to

In my case the user can give focus to the center box, and roll

I find it far more intuitive and quicker than heck.

Scott




Yahoo! Groups Sponsor

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To unsubscribe from this group, send an email to:
twsapi-unsubscribe@y...



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--------------------------------------------------------------------

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Awesome thanks so much Scott
----- Original Message -----
From: scott whitney
To: twsapi@y...
Sent: Saturday, July 13, 2002 8:14 AM
Subject: Re: twsapi: Spin buttons?


Spin buttons (Up Down Control) can be found in the components

Very handy little critters....

I have found something I like even more. If the Text Box is

You empty the combo list and repopulate it with a suitable range,

Here is the code I use to stuff the box on GotFocus

For dblTemp = dblSnag + (20 * tickStep) To dblSnag - (20 *

cmbPoints(Index).AddItem Format(dblTemp, "0.00")
If dblTemp = 0 Then Exit For
Next dblTemp

Here is the code I use to loop the box and pin the list:

snag = cmbPoints(Index)
With cmbPoints(Index)
For iTemp = 0 To .ListCount - 1
If .List(iTemp) = snag Then
.ListIndex = iTemp
Exit For
End If
Next iTemp
End With


The user doesnt know its a combo box, but he can use it as a text

Image

Very kewl. Take a look at the attached image, and what appear to

In my case the user can give focus to the center box, and roll

I find it far more intuitive and quicker than heck.

Scott




Yahoo! Groups Sponsor

Click here to find your contact lenses!

To unsubscribe from this group, send an email to:
twsapi-unsubscribe@y...



Your use of Yahoo! Groups is subject to the Yahoo! Terms of

--------------------------------------------------------------------

Do You Yahoo!?
Yahoo! Autos - Get free new car price quotes