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Dupullicate Key-Down Event in Visual Basic 6.0

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This topic and its replies were posted before the current version of LEADTOOLS was released and may no longer be applicable.

#1 Posted : Wednesday, June 14, 2006 5:38:47 PM(UTC)

Rudy

Groups: Registered
Posts: 9

I'm using Lead Main Control(14.0), Lead Multimedia Library(14.5), and both are patched recently from this official site.

I added one ltmmPlay control and one lead Main control.

The form is normal form in VB 6.0, and I just changed one propety. KeyPreview=TRUE

The problem is, when I press any key, form accepted two key-down events even I pressed just once.

Adding only ltmmPlay is OK, but with Main control, form duplicates key-down events.

The below is source code I made

Option Explicit

Private Sub Form_KeyDown(KeyCode As Integer, Shift As Integer)
Debug.Print KeyCode
End Sub

Private Sub Form_Load()
    ltmmPlay.sourcefile = "C:\VideoSamples\sample.mpg"

    leadMain.SetPicture ltmmPlay.GetStillPicture(10000)
End Sub


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#2 Posted : Sunday, June 18, 2006 2:57:10 AM(UTC)

Maen Hasan

Groups: Registered, Tech Support
Posts: 1,326

Was thanked: 1 time(s) in 1 post(s)

Hello,

I checked this issue on my machine, but didn't notice the same behavior (the KeyDown event fires only one time).
I checked this issue using ltmm_n.dll build number 14.5.0.21 and ltocx14N.ocx build number 14.5.0.10.

I am attaching the project that I used to check this issue on my machine.

If you are using older build number of LEADTOOLS, then please download and install the latest patches from our support site support@leadtools.com.

Please recheck the same issue using the attached project and let me know how it goes.

Thanks,
Maen Badwan
LEADTOOLS Technical Support

File Attachment(s):

Test_LTMM.zip (2kb) downloaded 38 time(s).

#3 Posted : Sunday, June 18, 2006 7:34:15 PM(UTC)

Rudy

Groups: Registered
Posts: 9

I checked your project.

I just changed video sample path, and run the application. (there was no waning or error to open your project)

and I found that when I clicked the lead main control, the key-down events fired two times.

I think when window focus is on lead main control, key-events fires two times.

Please recheck it.

Thanks.

#4 Posted : Tuesday, June 20, 2006 5:56:16 AM(UTC)

Maen Hasan

Groups: Registered, Tech Support
Posts: 1,326

Was thanked: 1 time(s) in 1 post(s)

Hello,

Before continue checking this issue, can you please try the following?
Please try to use a non-lead control (such as the picture box in VB6.0) instead of the LEAD Main control and try the same issue. Do you notice the same behavior?

Please let me know how it goes.

Thanks,
Maen Badwan
LEADTOOLS Technical Support

#5 Posted : Tuesday, June 20, 2006 3:29:49 PM(UTC)

Rudy

Groups: Registered
Posts: 9

I tested Picturebox, imagebox, button and label.

It just works fine. one key press - one key event.

Only in lead main control, one key press - two key events

Thanks.

#6 Posted : Wednesday, June 21, 2006 1:46:55 AM(UTC)

Maen Hasan

Groups: Registered, Tech Support
Posts: 1,326

Was thanked: 1 time(s) in 1 post(s)

Hello,

I rechecked the same issue on my side and notice the same problem that you have.

I reported this issue to our engineers under incident number 4707AMN so that they can investigate more about this behavior.
Please keep the incident number to ask about the status in the future. Also, I will let you know when this incident is addressed.

Please let me know if I can be of further assistance.

Thanks,
Maen Badwan
LEADTOOLS Technical Support

#7 Posted : Thursday, July 6, 2006 3:47:05 PM(UTC)

Rudy

Groups: Registered
Posts: 9

Hello

This problem is seriously important for our application.

I've been waited two weeks to resolve this problem.

Please give me any idea as soon as possible.

#8 Posted : Tuesday, July 11, 2006 12:04:55 AM(UTC)

Amin

Groups: Manager, Tech Support
Posts: 367

Was thanked: 1 time(s) in 1 post(s)

Rudy,
The problem is caused by VB itself and happens with some (but not all) non-LEADTOOLS controls, including a few of Microsoft's controls. The following Microsoft Knowledge Base article describes this problem and a suggested workaround that you could use with VB.
http://support.microsoft.com/default.aspx?scid=kb%3Bzh-cn%3B149273

Amin Dodin

Senior Support Engineer
LEAD Technologies, Inc.

#9 Posted : Tuesday, July 11, 2006 3:42:37 PM(UTC)

Rudy

Groups: Registered
Posts: 9

It was MS's problem.

I didn't know it

Thanks

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