C / C++ / MFC

Creating ActiveX control (variable types)

20-Jul-04 10:33

Are you using MFC? If so, I assume you have a CRecordset object. Its GetDefaultSQL() method contains the name of the table being operated on. Either create another CRecordset that operates on a different table, or change the value being returned by the GetDefaultSQL() method.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

BlackDice20-Jul-04 9:26

BlackDice

20-Jul-04 9:26

I'm making an activex control using VS.Net 2003. The control will probably be used in VB mostly. I want to know how I can have enumerated constants show up (like in VB's MsgBox() function). Also, when I try to put in the return type for a function that would be considered a Boolean in VB, I don't see any data types that would map to VB's Boolean. And the 'Add Method' wizard tells me that I may only specify variant types of variables that are predefined in the list. Any help would be greatly appreciated.

If it's broken, I probably did it

bdiamond

window message

Anonymous20-Jul-04 9:10

20-Jul-04 9:10

Hai,
Is there any WM message sent to the main window while displaying another window (eg. a message box) or when that other window moves over the main window?
Thanks a lot.

Alexander Wiseman20-Jul-04 9:21

Alexander Wiseman

20-Jul-04 9:21

When a message box is displayed or any other modal dialog box, then the main window will not be receiving any messages. The main window will receive WM_PAINT messages if there is another window over it (and not as big as it) which moves, because the OS will require the main window to redraw itself if another window on top of it changes position.

In your app, do you create the window which is over the main window? Is it modal or modeless? If it is modal and your app created the sub-window, you should handle the messages sent to that sub-window and then you can send any messages you want to the main window.

Sincerely,
Alexander Wiseman

Est melior esse quam videri
It is better to be than to seem

Anonymous20-Jul-04 9:35

20-Jul-04 9:35

Hai,
Thanks a lot for ur reply.
Actually I have a main Dialog where in a particular region I do the drawing.
The problem is I cannot use WM_PAINT to draw. I have a common user defined function that gets the DC for the drawing. My app calls this function at many places and at each time the drawing is different which i manage using flags.

Now if I display a message box which is displayed over the drawing in turn erasing it. Or if I move the message box over my drawing it gets erased.
Since I cannot use WM_PAINT I dont know how to solve this problem.

Is there anyway to get rid of this?
Thanks again.

Alexander Wiseman20-Jul-04 11:29

Alexander Wiseman

20-Jul-04 11:29

You could receive the WM_PAINT message anyway and, when there is a message box over your window, then call your custom drawing function inside the WM_PAINT message handler.

Is the WM_PAINT message being sent at all in your app right now, or are you just discarding it?

Sincerely,
Alexander Wiseman

Est melior esse quam videri
It is better to be than to seem

Doc/View Philosophical Question...

Bob Stanneveld20-Jul-04 12:58

Bob Stanneveld

20-Jul-04 12:58

Hello,

You can work around this problem of the WM_PAINT message.

Anonymous wrote:
The problem is I cannot use WM_PAINT to draw. I have a common user defined function that gets the DC for the drawing. My app calls this function at many places and at each time the drawing is different which i manage using flags.

You can store the flags in member variables (or if there are not to may as a parameter for a WM_PAINT message).

The thing you do is call your drawing function from OnPaint() or put the drawing code into OnPaint(). Second, at every place you call your custom drawing function, you send a WM_PAINT message with the flags as parameters (or set the flags in member variables).

Good luck.

A student knows little about a lot.
A professor knows a lot about little.
I know everything about nothing.

COM programming

Tropicana20-Jul-04 8:48

Tropicana

20-Jul-04 8:48

Hi,

I'm new to COM programming and in need of a little help. I'm trying to test some DirectX Filters which are COM objects and have done the following:

I took a DirectX interface called IAMTVTuner and renamed it IAMTest. I want to see if it will still work under it's new name because I am going to end up doing some funky things with it. The problem I think is that the GUID is still associated with IAMTVTuner. I'm not sure how to either: associate the GUID with the IAMTest OR give the IAMTest a new GUID.

Is the association of GUIDs with COM objects and interfaces done in .idl files? I tried running Midl.exe on a file that I changed but I get errors. I'm not even sure if I'm on the right track.

Thanks

Re: COM programming

Antti Keskinen20-Jul-04 11:58

Antti Keskinen

20-Jul-04 11:58

No, it will not work, and you've quite mistracked.

I suggest quickly renaming the interface back or you will corrupt your DirectX SDK installation for certain. If you rename the interfaces in the header files, and compile the code, then during execution, when you call the DirectX methods, you'll most likely cause serious errors. Or at least, your application will not do what it is supposed to. This includes crashing/damaging the OS and/or DirectX run-time.

Each COM object, and each interface they expose is considered unique. The Globally Unique Identifier (GUID) is used to identify these interfaces and objects on a global, around-the-world scale. If you created an interface that had the same GUID as DirectX's IAMTVTuner, then you'd be breaking a major rule of COM programming. In plain english, do not do this. Give your interface a new GUID, period. You can use the GUIDGEN.EXE to generate new GUIDs to use with your NEW interfaces.

If you need to extend the functionality offered by the IAMTVTuner interface, I suggest creating a standard C++ class that queries and uses the interface, while providing public functions that allow the user of class to do the "flunky things" you describe.

-Antti Keskinen

----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.

Nitron20-Jul-04 8:11

Nitron

20-Jul-04 8:11

What method do you think is best to control a view from another class, say for instance, a modeless dialog:

A: Let the dialog control the view directly.

B: Let the dialog talk directly to the view and have the view do all the work.

C: Route messages from the dialog to the view and let the view interpret the messages and do the work.

~Nitron.

ññòòïðïðB A start

Re: Doc/View Philosophical Question...

Ravi Bhavnani20-Jul-04 9:56

Ravi Bhavnani

20-Jul-04 9:56

In keeping with the MVC pattern and the philosophy of abstraction, I would offer a public method in the view class that exposes the appropriate functionality. This minimizes the contract between the view and its clients.

/ravi

My new year's resolution: 2048 x 1536
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Re: Doc/View Philosophical Question...

David Crow20-Jul-04 10:37

Re: Doc/View Philosophical Question...

20-Jul-04 10:37

In the spirit of weak-coupling, I see option C as the way to go.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Bob Stanneveld20-Jul-04 13:05

Bob Stanneveld

20-Jul-04 13:05

If you don't mind the time of execution (e.g. the delay because of the message qeue) the option C would be my solution.

If you do need to control the time of execution (e.g. when you would send a message, you really want the view to process it imediately), option B would be the choice for me.

A student knows little about a lot.
A professor knows a lot about little.
I know everything about nothing.

setting dialog size

Anonymous20-Jul-04 6:39

20-Jul-04 6:39

Hai,
I want to know how to set the size of the dialog box dynamically in VC++ win32. Is there any specific function ? Thanks for help.

Re: setting dialog size

Nitron20-Jul-04 7:28

Nitron

20-Jul-04 7:28

CDialog::MoveWindow(x,y,cx,cy);

~Nitron.

ññòòïðïðB A start

Re: setting dialog size

David Crow20-Jul-04 10:38

20-Jul-04 10:38

Also SetWindowPos().

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

IE Favorites

Anonymous20-Jul-04 4:34

How to handle doubleclick on a toolbar

20-Jul-04 4:34

Is there any way by which i can get some sort of notifications whenever a new web page is added in IE Favorites

Re: IE Favorites

Ravi Bhavnani20-Jul-04 5:34

Ravi Bhavnani

20-Jul-04 5:34

You could check for file changes to the IE favorites directory. See this[^] article for instructions.

/ravi

My new year's resolution: 2048 x 1536
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ravib@ravib.com

MyttO20-Jul-04 4:27

MyttO

20-Jul-04 4:27

Hi everyone,

I dramatically need to handle double click messages on toolbar items, and couldn't find a single clue in CP articles.

If someone knows the trick or knows a place where I can find it, i would appreciate his/her help.

Thanks in advance

-MyttO

Re: How to handle doubleclick on a toolbar

Alexander Wiseman20-Jul-04 5:24

Alexander Wiseman

20-Jul-04 5:24

Why not add a WM_LBUTTONDBLCLK handler to the toolbar window? In the message handler function, you could detect which toolbar button was double-clicked by translating the mouse position to an item on the toolbar.

One word of warning: if you want to handle a double click and a regular click, then you will need to add some logic to the single click handler to wait and see if the user does a double-click. This is because the messages generated from a double-click look something like this:

WM_LBUTTONDOWN
WM_LBUTTONUP
(so now the command handler for the toolbar button will be invoked)
WM_LBUTTONDBLCLK
(now your double click handler will be invoked)
WM_LBUTTONUP

Hope that helps!

Sincerely,
Alexander Wiseman

Est melior esse quam videri
It is better to be than to seem

How to Enable EditBox through Win32Application(SDK)

Anonymous20-Jul-04 3:37

Re: How to Enable EditBox through Win32Application(SDK)

20-Jul-04 3:37

Hi, All
I have two RadioButton and two Editbox, i set one radio button as a default set(Checked)(.) and disable two editbox disable. And other is not checked,

Now if i checked another radio button then the two edit box enable. I am doing SDK programming(Win32 application).

David Crow20-Jul-04 3:53