C / C++ / MFC

1-Jun-00 7:03

Hi All,

I used the following code. But it appears that my code in the OnTimer function is never executed.
The strangest thing is that if I click the menu ,so it drops down, the timer is executed! And as soon as I pull up the menu again, the timer stops!
Can anyone give me a explaination for this? Thanks a lot.

void CMyDialog::OnMyFunction()
{
...
SetTimer(1, 500, NULL);
...
}

void CMyDialog::OnTimer(UINT nIDEvent)
{
... // my code}
}

Dmitriy1-Jun-00 9:54

1-Jun-00 9:54

Have you a handler for WM_TIMER in message map?

BEGIN_MESSAGE_MAP...
...
ON_WN_TIMER()
END_MESSAGE_MAP

try to use
VERIFY(SetTimer(1,500,NULL)); to make sure you've set timer

Member 117662571-Jun-00 11:52

1-Jun-00 11:52

Yes, I have the handler in message map.
what does the VERIFY() should do? because nothing different happened when I add it.

The line of code right before the SetTimer(1,500,NULL) is:
MCIWnd(hMCI); // plays a movie

This shouldn't affect anything, should it? I know that MSDN says "The WM_TIMER message is a low-priority message."
I have another smaller app that also dialog-based that does that: plays a movie while activating the timer.

Thanks.

Dmitriy2-Jun-00 4:14

2-Jun-00 4:14

VERIFY does make sure the function returns value non-zero, otherwise it popups assertion dialog box in DEBUG, in Release does nothing.
You, probably, right speaking about low-priority. You may create separate thread for handling WM_TIMER.

Member 117662572-Jun-00 6:12

2-Jun-00 6:12

I never use thread before (and it sounds&seems confusing) Smile | :)

Could you please post a small sample code on how to create, call, and destroy a simple thread on an MFC dialog-based?
Thanks a lot in advance.

Dmitriy2-Jun-00 4:15

2-Jun-00 4:15

Andy Bantly2-Jun-00 8:54

Andy Bantly

2-Jun-00 8:54

Try running it through the debugger and trace your code. Something might make itself clear to you. ~Andy

Member 117662572-Jun-00 9:35

2-Jun-00 9:35

I did some more digging and found something:

In the project, I create an owner draw button. What I want to do is move this button while the movie is playing. Therefore I add this line on OnTimer:

GetDlgItem(IDC_MY_IMAGE_BUTTON)->MoveWindow(newX, newY, newWidth, newHeight, true);

And it works (it moves while the movie playing). But I also want to draw an image on the button, so I created a new class CMyImageButton, derived from CButton class.
And as soon as I associated the owner draw button variable to CMyImageButton class, the OnTimer stop working.
Any idea why?

Thanks.

Paul Hooper6-Jun-00 18:10

Paul Hooper

6-Jun-00 18:10

Many moons ago I remember having all sorts of trouble with SetTimer and seem to remember thatI ended up fixing them by changing the event number ie

SetTimer(111,500,NULL);

I never worked out why this worked and 1 didn't but it may be worth a try in your case.

Why do enums vanish when my tlb file is imported using ClassWizard?

Stephen Kellett15-Jun-00 8:15

Stephen Kellett

15-Jun-00 8:15

If you are using SetTimer() with a NULL 3rd argument you are
relying on the message queue sending you the lowest priority message going to tell you about the timer.

Not good. Even worse is if you are busy then no messages are
being processed, hence your timer will never be triggered.
This is why when you click the menu, you caused some processing of the message queue to happen, you get your timer event.

Solution 1:
Pass a callback function for parameter 3. This will be called much more reliably.

Solution 2:
Go multi threaded (beyond the scope of me typing just before going home). There are various articles on codeproject or you could take a look at some of the Platform SDK samples.

I've used both 1 and 2 depending on the situtation (and programming model - Win16 only solution 1 is available).

Cheers

Stephen Kellett

yaku1-Jun-00 6:21

yaku

1-Jun-00 6:21

I have a VC 6.0 SP3 App Wizard generated dll. In the dll's type library I added an enum. The enumerated type is used as an argument in a ClassWizard Generated method. I just changed the return value to be my enum. The basic layout of the odl is below.

[
uuid(...),
helpstring(...),
version(1.0)
]
library MyLib
{
importlib("stdole32.tlb");
importlib("stdole2.tlb");

typedef [uuid(...), v1_enum, helpstring(...)]
enum MyEnum
{
[helpstring(...)] val1 = 1,
[helpstring(...)] val2
}MyEnum;

[ uuid(...) ]
dispinterface MyInterface
{
properties:
//{{AFX_ODL_PROP(CMyInterface)
[id(1)] MyEnum TheType;
//}}AFX_ODL_PROP

methods:
//{{AFX_ODL_METHOD(CMyInterface)
//}}AFX_ODL_METHOD
};

//{{AFX_APPEND_ODL}}
//}}AFX_APPEND_ODL}}
};

When I compile the dll it compiles cleanly and I can see my enum using the OLE-COM object viewer, and if I use the dll in VB I also can see the enumeration, and if I #import the tlb file the enumerations are properly declared. The problem is when I try importing the dll into another appwizard generated exe using ClassWizard. When I do this all my interfaces are imported but ClassWizard ignores the enums I have declared. Is there anyway to get my enums to be declared in the ClassWizard generated class files or do I have to do it myself. Simply importing the tlb is not an option at this point because I would have to rewrite too much of the existing application I am using my dll in.

Building a DLL

kaine1-Jun-00 6:11

kaine

1-Jun-00 6:11

I know it might be a ridiculous question but, how to build a DLL with VC++?.
I have a 'simple' program that takes 3 parameters and sends mail through
Lotus Notes (made with the Notes C++ API), I've compiled it with VC++ and it
works perfectly but now I want to turn it into a DLL and I don't know
exactly what changes and additions I have to make to build the app as a DLL
so that the procedure that builds and sends the mail can be invoked from a
different app.

Maybe a very basic DLL source could help me, any help would be welcome,
thanks

Re: Building a DLL

C^hris L^osinger6-Jun-00 5:12

C^hris L^osinger

6-Jun-00 5:12

If you're using VC6, you can create DLL projects (MFC or not) from the AppWizard. It will stub out a bunch of functions for you and even include some sample code to show how to export your own stuff.

If you're using VC5 or earlier, you have to do this by-hand. But, it's not difficult. I just use the same template code (3 files, .cpp, .def and a .h) over and over.

-c

How to access an Explorer Bar from HTML?

mahesh1-Jun-00 2:53

mahesh

1-Jun-00 2:53

Hello,
I have an Explorer Bar which host web browser control ( IWebBrowser2 ). Now I want to give this window a name so I can access it from other applications such as VBScripts, HTML etc. Perfect examples are IE's main and Search windows. We can access these using _Search and _main.

Any ideas?

regards,
Mahesh

Please help with "A required resource" error

Joep1-Jun-00 0:03

Joep

1-Jun-00 0:03

I wrote an app which has a CScrollView derived class with several instances of an ActiveX control that I also wrote in it. Everything works fine except after a few times scrolling. Then, on Win98SE, the ActiveX controls aren't repainted anymore, the program hangs and a message box saying "A required resource was" pops up (great error
message!). When I debug under Win2K it takes much longer before the program hangs and after a few seconds MSDev comes up with the disassembler window on an int 3 line.

I can't find anything in the KB about "a required resource". I haven't the faintest idea where to look next. This is the last thing I must repair before rolling out the
app to my clients. Does anyone have a clue what this could be?

Thx a lot, Joep

Re: Please help with

Dmitriy1-Jun-00 6:27