C / C++ / MFC Discussion Boards

Vassili22-May-03 2:52

22-May-03 2:52

Thanks a lot!

Meanwhile I found that it also seems to work with:

myB.ShowWindow(SW_HIDE); and
myB.ShowWindow(SW_SHOWNORMAL);

Is there a difference between myB.ShowWindow(SW_SHOWNORMAL); and
myB.EnableWindow( FALSE );

Another question:
In my application I do not have any 'OK' or 'Cancel' buttons. But if I press the enter button on my keybord the application terminates... and I don't know why.

Re: How to hide a button?

David Crow22-May-03 3:16

David Crow

22-May-03 3:16

Vassili wrote:
Is there a difference between myB.ShowWindow(SW_SHOWNORMAL); and
myB.EnableWindow( FALSE );

Yes.

Vassili wrote:
In my application I do not have any 'OK' or 'Cancel' buttons. But if I press the enter button on my keybord the application terminates... and I don't know why.

Even though you don't have an OnOK() or OnCancel() handler, the defaults are still being called. They, in turn, call EndDialog().

Re: How to hide a button?

Rage22-May-03 3:19

Rage

22-May-03 3:19

Vassili wrote:
Is there a difference between myB.ShowWindow(SW_SHOWNORMAL); and
myB.EnableWindow( FALSE );

Yes. ShowWindow will only hide the button, but it will still be there and active, the only thing is you can'T see it. If for some reason, it gets displayed again (Some lost message ..) the user can use it.
EnableWindow really disables the button functionnality.

If you use these functions on a "usual" button (CButton), ShowWindow(SW_HIDE) will make it disappear whereas EnableWindow(False) will make it unclickable and will grey its caption. I think this make clearer the difference between hiding a control and disabling it.

Vassili wrote:
n my application I do not have any 'OK' or 'Cancel' buttons. But if I press the enter button on my keybord the application terminates... and I don't know why.

From Mike Dunn's FAQ : http://www.codeproject.com/cpp/cppforumfaq.asp#mfc_dlgclosekeys[^]

~RaGE();

Re: How to hide a button?

csc22-May-03 4:52

csc

22-May-03 4:52

the other question ... the ok and cancel button which are not there but working via keystrokes ...

If you want to do nothing in your dialog, just override the default handlers of these keys :

class CMyDialog::CDialog
{
.
.
virtual void OnOK( ) { /* do nothing*/ };
virtual void OnCancel( ) { /* do nothing*/ };

}

for details look at the msdn descriptions of these cdialog members, for example OnOk :

CDialog::OnOK
virtual void OnOK( );

Remarks

Called when the user clicks the OK button (the button with an ID of IDOK).

Override this member function to perform the OK button action. If the dialog box includes automatic data validation and exchange, the default implementation of this member function validates the dialog-box data and updates the appropriate variables in your application.

If you implement the OK button in a modeless dialog box, you must override the OnOK member function and call DestroyWindow from within it. Don’t call the base-class member function, because it calls EndDialog, which makes the dialog box invisible but does not destroy it.

How to Install a Windows XP theme with MFC

jia_wei22-May-03 2:03

jia_wei

22-May-03 2:03

Hello,
In a MFC program,I want to change windows themes.I have tried to call ShellExcute() to install a theme, but it does not work automatically.The display window appeared,I need to press "apply" button to finish the install process. In StyleXP,a product of TGT soft,the display window did not appear when install a theme. Anyone who knows the anwser is warmly wellcomed to reply.
Thanks

Jia Wei
Laugh | :laugh:

99999... in item text in Unicode with CTreeView

BadJerry22-May-03 2:02

BadJerry

22-May-03 2:02

I am using CTreeView with LPSTR_TEXTCALLBACK for all my item texts...
In OnGetdispinfo, I either write
a) When I have a safe LPCTSTR
pTVDispInfo->item.pszText = (LPTSTR)(LPCTSTR) pMyObject->GetName();

b) Or if need to build a string dynamically, I write something like this
m_strItem = pMyObject->BuildString();
pTVDispInfo->item.pszText = (LPTSTR)(LPCTSTR) m_strItem;
where m_strItem is a CString member of my CTreeView

It works perfectly but not in Unicode... for some of the child items instead of having my "BuiltString", I get 9999999...

Any idea?

Re: 99999... in item text in Unicode with CTreeView

BadJerry22-May-03 3:11

BadJerry

22-May-03 3:11

Please do not ask why but

<br />
m_strItem = (LPCTSTR) pMyObject->BuildString();<br />

did the trick...

pMyObject->BuildString() returned a CString... I wish somebody could enlighten me there!

How dou you drawing a rectangle onto a video source?

Member 40481322-May-03 0:41

Member 404813

22-May-03 0:41

Anyone know how to draw a rectangle box onto a video source?

Re: How dou you drawing a rectangle onto a video source?

Trollslayer22-May-03 1:20

Trollslayer

22-May-03 1:20

Can you explain in more detail ?
Is this a captured image, real time capture etc. DirectShow is MSs DirectX video SDK, maybe there is information in there ?

Elaine Rose | [Rose]

The tigress is here Big Grin | :-D

Re: How dou you drawing a rectangle onto a video source?

Member 40481322-May-03 2:08

Member 404813

22-May-03 2:08

I think the video source is from DirectShow.. using AmCap.... is there a filter function i can use to overlay my rectangle box onto it?

thanks

Re: How dou you drawing a rectangle onto a video source?

Trollslayer22-May-03 3:53

Trollslayer

22-May-03 3:53

I haven't used filters myself (just getting into DirectShow) but probably best to make a descendant of the existing filer and add the rectangle before the data is passed on.

Elaione Rose | [Rose]

The tigress is here Big Grin | :-D

OLE-Automation debugging problem.

vcseeker22-May-03 0:20

vcseeker

22-May-03 0:20

Hi, i am dealing witha code that uses OLE-Automation to communicate between two different applications.I have added some code to client and it bagan throwing exceptions at server while calling InvokeHelper() for one of interface functions..I have no clue why it throws the exception.I WANT TO DEBUG THROUGH THE SERVER TO UNDERSTAND WHERE THE PROBLEM IS.CAN ANYBODY HELP ME REGARDING THIS.
THANKS AND REGARDS.

Anybody????

vcseeker22-May-03 2:04

vcseeker

22-May-03 2:04

Re: OLE-Automation debugging problem.

AlexO22-May-03 4:17

AlexO

22-May-03 4:17

There is not enough information, so I will have to guess.
You have exe client that uses outproc(exe) COM server.
Both client and server have to be build with detailed PDB files.
PDB files should be located in the same directory as exe.

1. Start your client in the debug mode
2. Start second instance of VC.
a. In VC6 use menu Build->Start Debug->Attach to Process
aa. In VC7 use menu Tools->Debug Processes
b. find your COM server process in the list click OK.
c. open your source code and set breakpoints

Re: OLE-Automation debugging problem.

vcseeker22-May-03 21:48

vcseeker

22-May-03 21:48

Hi Alex,
Thanks for help.
I tried as you have told,Run the client in debug mode than run the server.and then went to vc++ build ->Start Debug ->Attach to process.But i didn't see any processes listed their.I don't know what is wrong?
Please help.

VC6 Add-in for selecting configuration

John Oliver22-May-03 0:12

John Oliver

22-May-03 0:12

Hello,

I've a workspace with several projects and I switch between them quite a bit since some of the projects are test cases for the main project. I was wondering if anybody knows if there is an Add-In available which docks a Combobox on a toolbar allowing the user to Set the Active Project Configuration. I'd find it very useful.

Otherwise I'd have a go at writing it myself, although it would be my first add-in. I'm aware that there is a CP article on a library which provides a better interface to the VC6 object model than that which MS provides and I might need it for enumerating the projects in the Workspace. I think the combo box in a toolbar might be the scary part.

Thanks,
John

Re: VC6 Add-in for selecting configuration

John Oliver22-May-03 0:21

John Oliver

22-May-03 0:21

Hello again,

I've just realised that I can customise Visual Studio 6 to add the Select Project Configuration combo to a toolbar by dragging the combo which appears in Tools-Customize-Commands-Build.

But I'd still like to select amongst all the projects in the workspace.

Cheers,
John

Re: VC6 Add-in for selecting configuration

Pavel Klocek22-May-03 0:32

Pavel Klocek

22-May-03 0:32

Enable "Buid" toobar. It has "Set Active Project" and "Set Active Configuration". You can drag them to other toolbar, if you need it.

Pavel
Sonork 100.15206

Re: VC6 Add-in for selecting configuration

John Oliver22-May-03 0:34

John Oliver

22-May-03 0:34

Brilliant! Thanks.
John

Memory Tracking 2

The_Server22-May-03 0:05

The_Server

22-May-03 0:05

Hi all...
thank you for reading.

I tried to overload the new and delete operators,
and it didn't work.

#include <stdio.h>
#include <conio.h>
 
void * operator new( unsigned int cb );
void operator delete (void * mem);

void main()
{
  char * var= new char[8];
  
  if (var)
    delete []var;
}
 
void * operator new( unsigned int cb )
{
    printf("allocating...\n");
    void *res = NULL;
    return res;
}

void operator delete (void * mem)
{
  if (mem)
    printf("deallocating...\n");
}

and the original new and delete was called;
not mine...
please help WTF | :WTF:

=-=-=-=-=-=-=
Rose | [Rose]

The Server
=-=-=-=-=-=-=

Re: Memory Tracking 2

Neville Franks22-May-03 0:26

Neville Franks

22-May-03 0:26

You need to include new.h

The declaration for operator new is:

void *__cdecl operator new(
   size_t count
);

not what you have.

A quick search of MSDN for operator new will yield lots of usefull information.

Neville Franks, Author of ED for Windows. Free Trial at www.getsoft.com

Re: Memory Tracking 2

The_Server22-May-03 1:42

The_Server

22-May-03 1:42

I did what what you like you said...
and that works.
thanks Rose | [Rose]

But can you tell what should I do with constructors and distractors Confused | :confused:

.
thanks for your time.

BTW:
The definition of size_t is
typedef unsigned int size_t;

=-=-=-=-=-=-=-=
Rose | [Rose]

The Server

Re: Memory Tracking 2

Neville Franks22-May-03 1:49

Neville Franks

22-May-03 1:49

The_Server wrote:
did what what you like you said...
and that works.
thanks

good.

The_Server wrote:
But can you tell what should I do with constructors and distractors.

I might be able to if you explain what the problem is.

The_Server wrote:
BTW:
The definition of size_t is
typedef unsigned int size_t;

Yes on version x of compiler y for platform z it probably is. Smile | :)

Neville Franks, Author of ED for Windows. Free Trial at www.getsoft.com

Re: Memory Tracking 2

The_Server22-May-03 9:52

The_Server

22-May-03 9:52

Neville Franks...

Thank you.

Neville Franks wrote:
I might be able to if you explain what the problem is.

It calls the ctors and dtors autometically.
(* Sorry for asking you before chacking Blush | :O

*)

But 1 question remaining: Why/How Come automatically?

=-=-=-=-=-=-=-=
:rose The Server

Re: Memory Tracking 2

Neville Franks22-May-03 10:24

Neville Franks

22-May-03 10:24

The_Server wrote:
But 1 question remaining: Why/How Come automatically?

Because that is what the C++ Language spec says operator new does. ie. It allocates memory and then calls the ctor.

"Who deleted my pointer?" may be of interest:
http://www.codeproject.com/debug/newdel.asp[^]

Neville Franks, Author of ED for Windows. Free Trial at www.getsoft.com

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