Re: Touch screen - C / C++ / MFC Discussion Boards

gggwb16-Jan-08 1:37

16-Jan-08 1:37

Don Box ,hi.
my applition is fivechess,so I want when I pull mouseLButtonDown that the ellispe will appear the bitmap.
if my drawings in Onpaint(),I needn't pull mouse there will a ellispe appear the bitmap.
Can you answer me again..?
Thank you..

Re: the Invalidate problem

Don Box16-Jan-08 1:57

Don Box

16-Jan-08 1:57

Plz write in full detail.

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Re: the Invalidate problem

gggwb16-Jan-08 2:15

gggwb

16-Jan-08 2:15

I paste a bitmap in the OnPaint.And I press mouselbutton,there will a ellispe on the bitmap.I write the drawing function,when I press mouselbutton(OnLbutttonDown) the drawing function will be called.But when the other window move on my applition's window,the ellispe will disappear.How can I do..?

Re: the Invalidate problem

Nathan Holt at EMOM16-Jan-08 6:21

Nathan Holt at EMOM

16-Jan-08 6:21

gggwb wrote:
I paste a bitmap in the OnPaint.And I press mouselbutton,there will a ellispe on the bitmap.I write the drawing function,when I press mouselbutton(OnLbutttonDown) the drawing function will be called.But when the other window move on my applition's window,the ellispe will disappear.How can I do..?

Add an OnPaint message handler to your dialog (or whatever window you are drawing the ellipse to). Then the body should be something like

{
    CPaintDC dc(this);
    <draw to dc>
}

If I'm mistaken, and you aren't drawing an ellipse on a window, then how are you seeing the elipse?

Nathan

Re: the Invalidate problem

Mark Salsbery16-Jan-08 7:13

Mark Salsbery

16-Jan-08 7:13

You draw in response to a mouse message. When a window is moved across
your window, your window gets a WM_PAINT message for the invalidated region
of the window. This means your drawing needs to be the same for WM_PAINT
as when you draw in response to the mouse message.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Touch screen

Kiran Pinjala16-Jan-08 0:53

Kiran Pinjala

16-Jan-08 0:53

Can i get some sample code to build a touch screen application

Saadhinchaali

Re: Touch screen

Iain Clarke, Warrior Programmer16-Jan-08 1:48

Iain Clarke, Warrior Programmer

16-Jan-08 1:48

Ermm, don;t they just act like a mouse?

Just ignore WM_MOUSEMOVE when a button isn't pressed, and it should be the same as a normal PC.

Iain.

Re: Touch screen

Joan M16-Jan-08 2:16

Joan M

16-Jan-08 2:16

Normally you have only to worry on the special design (bigger buttons...) but the applications don't need to be in any way modified. We have developed lots of them here and when you touch the screen is like a click on the left button of the mouse.

If you want to create the driver of one touch screen, then this is a whole different story. But there are several touch screens out there that are not expensive.

Hope this helps.

ActiveX Control

sv1416-Jan-08 0:41

sv14

16-Jan-08 0:41

I have an Activex control which has already been published. I need to add some new features to it. It shouldn't affect the applications that are already using it. How do I go about it?
The control exposes 4 interfaces. Is it better to write a new interface? I also need to use previous 4 interfaces. Should the activex control's CLSID and version be changed?

Re: ActiveX Control

CPallini16-Jan-08 9:50

CPallini

16-Jan-08 9:50

sv14 wrote:
Is it better to write a new interface?

Just add a new interface to the existing ones. Don't change the CLSID, change the version.
(at least this is my advise)
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.

[my articles]

Re: ActiveX Control

sv1416-Jan-08 17:30

sv14

16-Jan-08 17:30

Thank you very much for your reply.
But, I also need to modify the previous interfaces.It is basically an MFC Activex control(developed as a reusable component)

Ex: Consider that the control exposes two interfaces,
IExample1 - CSample1
IExample2 - CExample2

Now, There are new requirements that needs to be implemented. Basically, new functionality should be added to CSample1 and CSample2.

If I go for a new interface. The methods of this new interface should use the classes CExample1 and CExample2.

If I change the version and if this OCX is copied to the client machine, what will happen to the previous OCX and if I try to insert the OCX in a new application will there be a distinction between the new version and the old one.

I hope I'm not asking too many questions Smile | :)

I would really appreciate any help.

Thanks

Re: ActiveX Control

CPallini16-Jan-08 21:38

CPallini

16-Jan-08 21:38

sv14 wrote:
But, I also need to modify the previous interfaces

No. Interfaces must not change (It's the first COM commandment) otherwise client applications will be broken.

sv14 wrote:
Now, There are new requirements that needs to be implemented. Basically, new functionality should be added to CSample1 and CSample2.

This is good and feasible.

sv14 wrote:
If I go for a new interface. The methods of this new interface should use the classes CExample1 and CExample2.

Yes, and you can do it.

sv14 wrote:
f I change the version and if this OCX is copied to the client machine, what will happen to the previous OCX and if I try to insert the OCX in a new application will there be a distinction between the new version and the old one.

I think that you should replace the previous version of the OCX with the new one.
Anyway I'm not an expert on COM DLL versioning, try also to ask the COM forum.

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.

[my articles]

Catching event when new IE window is opened in BHO

ashishbhatt16-Jan-08 0:08

ashishbhatt

16-Jan-08 0:08

Hi All,

I am developing BHO (Browser Helper Object)in vc++ and till upto date it works fine.But I want to catch the event when any new explorer window is opened ,means if user opens any new explorer window at that time I want catch that event. SO I tried to use DISPID_WINDOWACTIVATE which do not catch this event. I also tried DISPID_NEWWINDOW2 but it catches event only when any new window is generated from the already opened explorer window.

Do you have any idea or any suggetion where I am making mistake??

Thanks in advance.

Ashish Bhatt,
System Developer,
Avinashi System Pvt. Ltd.

Re: Catching event when new IE window is opened in BHO

Don Box16-Jan-08 0:11

Don Box

16-Jan-08 0:11

U mean u wanna be notified when the user hits Alt + N or opens new explorer window (Not the window opened by Javascript)?

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Re: Catching event when new IE window is opened in BHO

ashishbhatt16-Jan-08 0:14

ashishbhatt

16-Jan-08 0:14

Thanks for the very quick reply.

Yaa, I want the notification when any new window is opened.( By whatever Atl + N or Ctl + T for new tab window)

Thanks.

Ashish Bhatt,
System Developer,
Avinashi System Pvt. Ltd.

Re: Catching event when new IE window is opened in BHO

Don Box16-Jan-08 1:11

Don Box

16-Jan-08 1:11

Then the ideal way is, create an Event Object with any Unique name (unique name can be generated using GuidGen) in a worker thread at specified interval of time. Then check its GetLastError() value. If the returned valued is ERROR_ALREADY_EXISTS, means new window has been opened. Open successful creation, remember to close the handle.

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Re: Catching event when new IE window is opened in BHO

ashishbhatt16-Jan-08 1:16

ashishbhatt

16-Jan-08 1:16

Thanks for replying.

But this not the perfact solution I will have to continuously check for the new window at regular time interval. Is that no other inbiult event that will generate when new window is opened during BHO imlpementation??? Frown | :(

I will try your suggetion. If you have any other suggetion then plz reply me.
Thanks.

Ashish Bhatt,
System Developer,
Avinashi System Pvt. Ltd.

Re: Catching event when new IE window is opened in BHO

Don Box16-Jan-08 1:25

Don Box

16-Jan-08 1:25

There r no such events. The events u r getting, such as BEFORENAVIGATE, NAVIGATIONCOMPLETE, belongs to the Web Browser ActiveX Control. So the Web Browser ActiveX Control doesn't monitor how many instances of it r running.
As far as I know, there's no such feature in IE.

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Re: Catching event when new IE window is opened in BHO

ashishbhatt17-Jan-08 16:01

ashishbhatt

17-Jan-08 16:01

Sorry for the very late.

May I ask One thing that when DISPID_WINDOWACTIVATE is generated in BHO ?HOw can I catch this event in my application??

Thanks.

Ashish Bhatt,
System Developer,
Avinashi System Pvt. Ltd.

Re: Catching event when new IE window is opened in BHO

David Crow16-Jan-08 2:35

David Crow

16-Jan-08 2:35

ashishbhatt wrote:
Yaa, I want the notification when any new window is opened.(

Each time IE is opened, doesn't an instance of your BHO also get created?

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"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Possible to link to different projects together?

rover_boy16-Jan-08 0:01

rover_boy

16-Jan-08 0:01

I'm new to Visual C++ and am creating a windows form application.

I was wondering if it was possible to link a console application which is written in C but stored in C++ files to a windows form?

So for example if I clicked a button in the Windows Form application then this would run the console application?

Re: Possible to link to different projects together?

Iain Clarke, Warrior Programmer16-Jan-08 0:10

Iain Clarke, Warrior Programmer

16-Jan-08 0:10

Didn't you ask this question an hour or so ago? If so, this time it makes more sense.

In your onclick event handler, you can use CreateProcess or ShellExecute to run the console program.

Iain.

Re: Possible to link to different projects together?

rover_boy16-Jan-08 0:57

rover_boy

16-Jan-08 0:57

Thanks for the reply before you replied I just got the error LNK1152 so not sure if I should try to solve this or use the ShellExecute

Re: Possible to link to different projects together?

David Crow16-Jan-08 2:37

David Crow

16-Jan-08 2:37

rover_boy wrote:
...I just got the error LNK1152...

Please explain.

Re: Possible to link to different projects together?

rover_boy16-Jan-08 3:46

rover_boy

16-Jan-08 3:46

I have client class written in C saved into C++ files. This class is to connect to a server. I want to use this code which connects to the server in my GUI which is created using windows forms.

I have added Additional Dependencies to the windows form project. The problem is when I include these .cpp code files to the windows form project I get the error LNK1152.

I also get warning messages: "This function or variable may be unsafe. Consider using sprintf_s instead. To disable deprecation, use CRT_SECURE_NO_WARNINGS"

I'm looking into ShellExecute to solve my problem

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