C / C++ / MFC

Re: invoke an MFC callback function from Non MFC app

14-Jul-06 7:20

shreelak wrote:
How do I that?

More specific information is required. However you cannot use any C++ class (MFC included) across modules unless the class is exported from a DLL. I have no idea if that is what you are looking for.

"Just about every question you've asked over the last 3-4 days has been "urgent". Perhaps a little planning would be helpful?"
Colin Angus Mackay in the C# forum

led mike

shreelak26-Jul-06 5:55

shreelak

26-Jul-06 5:55

yes what i meant was that MFC callback function is in a DLL and I can call other functions (not callback) from my calling program (non mfc dll) without any problem.
but when my non mfc dll tries to invoke the callback it doesn't get called

the same thing when called from an MFC program works fine.
So my question was is there some thing different that i need to do when i call it from a non mfc app?
like may be sometime of memory mapping? is there any sample code that i can look at?

-S

Re: invoke an MFC callback function from Non MFC app

led mike26-Jul-06 8:27

Re: invoke an MFC callback function from Non MFC app

26-Jul-06 8:27

shreelak wrote:
but when my non mfc dll tries to invoke the callback it doesn't get called

What does that mean? When you debug the application it just steps over the function without the function executing? Is there an exception? An error reported? what?

shreelak26-Jul-06 13:14

shreelak

26-Jul-06 13:14

yes it seems like it steps over
When i try to go in to the assembly code it show me a ref to the callback function but doesn't jump to it. instead it comesback to my calling functions next statement.
I don't get any exception.

Also I cut and pasted the same code into another applicaiton (MFC) and it works without any problem.

TIA
-S

Resource file: Dialog copy

ldaoust14-Jul-06 5:53

ldaoust

14-Jul-06 5:53

Using VS.NET 2003

VC++ MFC project.

Having a problem with dialog resource copies.

In VC6, I could insert a copy of an existing dialog and for which a class has been created, and then with the dialog editor I could add new controls on this copy and add event handler and variables for these new controls. In VC++.NET 2003 it does not seem to work. I can add a copy but after I add new controls on this dialog copy I cannot add events or variables to them because they are not listes in the Control Events in the properties page.

Steps to reproduce:
1) create a dialog (default template will be enough)
2) Create a class for this dialog
3) Right the dialog in the resource view and select 'Insert Copy', you will have to enter a valuee in the condition field, for example 'TEMP'
4) Add an edit control to this copy of the dialog template

Now, if you right click the edit control and select 'Add variable, the wizard will not have the proper control ID filled in. Also, if you go in the Properties of the dialog and select the Vontrol Events view, the ID for the edit control will not show up.

I had no problem doing this in VS6.

Anyone seen this problem and know a workaround ?

Can anyone tell me if it does the same thing in VS.NET 2005 ?

thanks.

Louis
* google is your friend *

Re: Resource file: Dialog copy [modified]

led mike14-Jul-06 6:15

14-Jul-06 6:15

in 2005 after you copy the dialog into the resource tree you open it in the disigner, right click and choose the "Add Class" menu item. This brings up the dialog where you can add a class derived from CDialog bound to the dialog resource. After you do that adding controls and member variables work as expected.

WARNING: Copy / Paste pattern is generally not a good development approach.

"Just about every question you've asked over the last 3-4 days has been "urgent". Perhaps a little planning would be helpful?"
Colin Angus Mackay in the C# forum

led mike

Last modified: Friday, July 14, 2006 11:13:07 AM -- copy / paste warning

ldaoust14-Jul-06 8:08

ldaoust

14-Jul-06 8:08

Hi led mike,

My example was for a simple dialog. My situation, and I guess this is something many other programmers have to face, is that I have dialogs that already have a working class with all the code and variables and event handlers doing their stuff. Now, I am adding a copy for this same dialog to add features to it, so logically I will want to use the same code that is already there. The compile condition I add to the dialog copy makes it available only when I compile resources with this condition set. I can add code to the dialog that will also be conditionnaly compiled with the same condition. This makes adding new features to a dialog easy and also is more team friendly.

You are suggesting to add a completly new class to the dialog. This would involve copying all the source from the other class to this new class and then adjusting the class name to match the new. If a modification is done to the original dialogs code (team) it will not be reflected in this class.

Why a copy of a dialog resource would not be a good devcelopement approach ?

Louis
* google is your friend *

led mike14-Jul-06 8:37

14-Jul-06 8:37

ldaoust wrote:
so logically I will want to use the same code that is already there.

I don't understand.

ldaoust wrote:
In VC6, I could insert a copy of an existing dialog and for which a class has been created, and then with the dialog editor I could add new controls on this copy and add event handler and variables for these new controls.

When you copied the dialog resource how was the new dialog template associated to the existing class so that class wizard would create the variables for the controls etc.?

"Just about every question you've asked over the last 3-4 days has been "urgent". Perhaps a little planning would be helpful?"
Colin Angus Mackay in the C# forum

led mike

ldaoust17-Jul-06 14:59

ldaoust

17-Jul-06 14:59

led mike wrote:
I don't understand.

I'm extending the functionality of a dialog. The class is already there. I am adding code to it. So the original dialog is bound to that class, i am working with that class.

led mike wrote:
When you copied the dialog resource how was the new dialog template associated to the existing class so that class wizard would create the variables for the controls etc.?

The original dialog template was already associated with the class through the ID of the dialog. The dialog copy uses the same ID , only the condition changes, the association is still with the same class. This behaviour is the same with .NET 2003. If you make a copy of an exisiting dialog (Insert Copy as I described in my original post) and only change the condition, that copy will also be bound to the original class.

Did you try it ?

Louis
* google is your friend *

led mike17-Jul-06 18:46

ReadDirectoryChangesW - How does it work?

17-Jul-06 18:46

ldaoust wrote:

Did you try it ?

Yes in 2003 and with or without the preprocessor macro defined I only get the original dialog so the copied template never executes and controls added to the copied dialog resource never show up in the list of controls in the "add member variable" dialog. Never used this feature before today so I never saw it work in VC6.

"Just about every question you've asked over the last 3-4 days has been "urgent". Perhaps a little planning would be helpful?"
Colin Angus Mackay in the C# forum

led mike

badpicker14-Jul-06 5:27

badpicker

14-Jul-06 5:27

Hi,
I am writing an application that has a centeralized file on a network. I want to monitor that file for changes and thought ReadDirectoryChangesW would work nice. My question is does the OS continually hit the disk to seek if it is changed? If so, then what is the difference if I just get the attributes myself? I am worried about excessive network traffic. Having 1000+ workstations hitting the disk just to see if the file changed could be a bottleneck.
Thanks in advance.
Darren

Re: ReadDirectoryChangesW - How does it work?

eusto14-Jul-06 6:04

eusto

14-Jul-06 6:04

You should have a small local program monitoring that file and broadcasting a message to notify all the users that it's status has changed.

Re: ReadDirectoryChangesW - How does it work?

David Crow14-Jul-06 6:06

David Crow

14-Jul-06 6:06

eusto wrote:
You should have a small local program monitoring that file

This is the whole reason for using ReadDirectoryChangesW() - so that you don't have to waste CPU cycles polling for changes.

"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank

"Judge not by the eye but by the heart." - Native American Proverb

Re: ReadDirectoryChangesW - How does it work?

David Crow14-Jul-06 6:05

David Crow

14-Jul-06 6:05

badpicker wrote:
...does the OS continually hit the disk to seek if it is changed?

No. The way to verify this is to use FileMon.

"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank

"Judge not by the eye but by the heart." - Native American Proverb

Font & Colour of Static control

si_6914-Jul-06 5:13

si_69

14-Jul-06 5:13

Hi All

Can anyone tell me how i can change the color and font of some of my static controls

i dont want to change them all, i would just like some of them changed

thanks

Simon

Re: Font & Colour of Static control

eusto14-Jul-06 6:01

eusto

14-Jul-06 6:01

implement ON_WM_CTLCOLOR for changing color. There's a simple example in MSDN somewhere

Re: Font & Colour of Static control

Hamid_RT14-Jul-06 8:05

Hamid_RT

14-Jul-06 8:05

See WM_CTLCOLOR and another WM_CTLs and for font use SetFont(..);

whitesky

Creating sensitive object drawing

kerr_forever14-Jul-06 4:50

kerr_forever

14-Jul-06 4:50

Hi,

I am developing a small application with capability to add circles/ squares and other objects in embeddedVC++. But I want to add the functionality to select an object.. and delete it...

Currently, I have been with using CDC class to draw them(extending the sample application scribble). But I dont have any idea how to add sensitivity when the stylus is tapped on a certain object.

Thankyou in advance,

Learn all you can from the mistakes of others. You won't have time to make them all yourself. ~Alfred Sheinwold

Converting WIKI markup to HTML

peterchen14-Jul-06 4:30

peterchen

14-Jul-06 4:30

I'm looking for sample code that converts WIKI markup (i.e. the **bold** /italic/ ||table||table|| stuff) to (X)HTML.

Any language is fine, C++ preferred, I'm just looking for ideas

Some of us walk the memory lane, others plummet into a rabbit hole

Tree<t> in C# || Fold With Us! || sighist

-- modified at 10:32 Friday 14th July, 2006: spaceshelpthereadertotelltheindividualwordsapart

Re: Converting WIKI markup to HTML

led mike14-Jul-06 6:07

14-Jul-06 6:07

ummm don't Wikis have to do that? So get some Wiki source code right?

On this listing there are several C++ implementations.

http://c2.com/cgi/wiki?WikiEngines[^]

"Just about every question you've asked over the last 3-4 days has been "urgent". Perhaps a little planning would be helpful?"
Colin Angus Mackay in the C# forum

led mike

how to search a file..

birajendu14-Jul-06 3:21

birajendu

14-Jul-06 3:21

I need to search a file by its extension irrespective of name in usb drive...

thanx in advance...

birajendu
CyberG India
Delhi
India

_AnsHUMAN_ 14-Jul-06 3:40

_AnsHUMAN_

14-Jul-06 3:40

Use FindFirstFile, FindNextFile if it suits your needs
and get the file name from that.

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

David Crow14-Jul-06 3:51

David Crow

14-Jul-06 3:51

The first parameter of FindFirstFile() supports wildcards.

"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank

"Judge not by the eye but by the heart." - Native American Proverb

birajendu14-Jul-06 4:05

birajendu

14-Jul-06 4:05

thanx ...actually i was not aware of using wildcard in find firstfil()..
thanx...

birajendu
CyberG India
Delhi
India