ListView with LVS_ICON style... - C / C++ / MFC Discussion Boards

!running 2 instances of app concurrently

Member 206903511-Jul-05 8:29

Member 2069035

11-Jul-05 8:29

I want only one instance of my VC++ 6.0 app to run at a time. How do I prevent users from running 2 or more instances at the same time?

John

Re: !running 2 instances of app concurrently

Geert van Horrik11-Jul-05 8:33

Geert van Horrik

11-Jul-05 8:33

Put this code in your InitInstance function:

	// Create mutex, because there cannot be 2 instances of this application<br />
	HANDLE hMutex = CreateMutex(NULL, FALSE, "MyAppName"); <br />
<br />
	// Check if mutex is created succesfully<br />
	switch(GetLastError())<br />
	{<br />
	case ERROR_SUCCESS:<br />
		// Mutex created successfully. There is no instance running<br />
		break;<br />
		<br />
	case ERROR_ALREADY_EXISTS:<br />
		// Mutex already exists so there is a running instance of our app.<br />
		return FALSE;<br />
		<br />
	default:<br />
		// Failed to create mutex by unknown reason<br />
		return FALSE;<br />
	}

Geert

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Re: !running 2 instances of app concurrently

David Crow11-Jul-05 8:51

David Crow

11-Jul-05 8:51

John Schwartz wrote:
How do I prevent users from running 2 or more instances at the same time?

See here.

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

auto_ptr

act_x11-Jul-05 7:45

act_x

11-Jul-05 7:45

I need to convert an existing library to use auto_ptr

So say in one class

class C
{
public :
auto_ptr<ccriticalparser> parser ;
} ;

Now in code that manages an Object of C I need to pass a pointer to CCriticalParser

class D {

void Foo-D()
{
C c1(char *fileName) ;
E e1(c1->parser);

}
}

class E {
E(const CCriticalParser *parser);
}

I get a compiler error in

E e1(c1->parser);

Now I want to be able to pass the Raw pointer , but still want the auto_ptr to maintain the object in C , hence I do not want to use auto_ptr::Release() .

I need to know a call in auto_ptr where I can obtain the Raw Pointer . Also where can i find proper documentation for auto_ptr ?

Engineering is the effort !

Re: auto_ptr

lemleyd11-Jul-05 8:30

lemleyd

11-Jul-05 8:30

you can always call get() (a method on auto_ptr) to get the raw pointer.

You should easily be able to find documentation for any STL class on the web.

Re: auto_ptr

act_x11-Jul-05 8:51

act_x

11-Jul-05 8:51

What is the best way of forcibly deleting the pointer pointed by the auto_ptr

My compiler complains about

autoPtrVar.reset(NULL) ;

Engineering is the effort !

Re: auto_ptr

Jack Puppy11-Jul-05 10:40

Jack Puppy

11-Jul-05 10:40

Try release(), then delete the returned pointer.

Pssst. You see that little light on your monitor? That's actually a government installed spy camera. Smile and wave to big brother!

Painted on the side of a dog trainer's van: SIT HAPPENS

ListView with LVS_ICON style...

Ian Bowler11-Jul-05 7:17

Ian Bowler

11-Jul-05 7:17

Hello,

I have a CListView - derived class with the LVS_ICON style. My text for the icons only wraps to two lines. I need the text to wrap more than two lines. Is there a way to do this?

NOTE:

This is how it looks now (pretend this is an icon):

|====|
|icon|
|====|
LineOne
LineTwo L...

This is how I want it to look:

|====|
|icon|
|====|
LineOne
LineTwo
LineThree

Thanks!

Re: ListView with LVS_ICON style...

Neelesh K J Jain11-Jul-05 20:18

Neelesh K J Jain

11-Jul-05 20:18

This is default view the list view will work. If you want to wraps the text then simply change the size of the icon dynamically, then it will wrap the text to the next line. But it all depends upon the size of the Icon you want to display in the ListView.

Pre-allocation of virtual memory

De Nardis Andrea11-Jul-05 7:12

De Nardis Andrea

11-Jul-05 7:12

Hi all,
Is there a way to pre-allocate some large amount of virtual memory for a process and then let it use?
I have the following problem: there is a very important service that use large amount of memory (up to 400MB and more) but its memory usage depends on time: sometime uses as low as 4MB of memory, sometimes 400MB. Sometimes it happens that it cannot find 400MB free because other less important processes uses it. A possible solution would be to pre-allocate 400MB, and then let 'malloc' and 'new' allocate from the pre-allocated pool.
Do you know a way to do it in W2K/XP?
Thanks a lot in advance.
Regards,
Andrea

Re: Pre-allocation of virtual memory

krmed11-Jul-05 7:45

krmed

11-Jul-05 7:45

You could overload the new operator and handle the details yourself...

See MSDN article "How to overload new..." http://support.microsoft.com/default.aspx?scid=kb;en-us;139638[^]

Hope that helps.

Karl - WK5M
PP-ASEL-IA (N43CS)
<kmedcalf@ev1.net>
PGP Key: 0xDB02E193
PGP Key Fingerprint: 8F06 5A2E 2735 892B 821C 871A 0411 94EA DB02 E193

Re: Pre-allocation of virtual memory

Jack Puppy11-Jul-05 10:43

Jack Puppy

11-Jul-05 10:43

Did you try VirtualAlloc?

Pssst. You see that little light on your monitor? That's actually a government installed spy camera. Smile and wave to big brother!

Painted on the side of a dog trainer's van: SIT HAPPENS

Re: Pre-allocation of virtual memory

De Nardis Andrea11-Jul-05 21:42

De Nardis Andrea

11-Jul-05 21:42

Hi,
unfortunately I have to reserve a large amount of global virtual memory because virtual memory (either physical or in page file) is a shared, limited resource. The article about the heap should fit but I still do not undestand how to use STL::new and malloc without making custom allocation classes.
So the problem is still open...
regards,
Andrea

simplistic font question.

Maximilien11-Jul-05 6:53

Maximilien

11-Jul-05 6:53

For a potentially unicoded application.

I use the alias "MS Shell Dlg" font in my application; I believe this is a proportional font.

Is there an equivalent for a fixed sized font ? does Courier ( Courier New ) fit what I'm looking for ?

Or Am I completly off the subject ?

Thanks.

Max.

Maximilien Lincourt
Your Head A Splode - Strong Bad

I need help (fatal + urgent)

TA-RS11-Jul-05 5:33

TA-RS

11-Jul-05 5:33

this is very important (fatal) for me. I think you can help me.
I need code of a Scentefic Calculator with C++ or VC++
that can draw functions like (y=sin(x)) and so on.
If you can give me an address or guidance.
Thank you very much again and again.

TA RedStar

Re: I need help (fatal + urgent) [edited - bis]

toxcct11-Jul-05 5:42

toxcct

11-Jul-05 5:42

certainly...

do you want it by e-mail, by postal mailing, drawn on a wing of a paper plane, or do you want me to send it to you with a carrier pigeon ???

man, forum are not stores for full designed applications... we're are not here to do the job the teacher excpects you to do. we are just here to HELP you making your project complete on the point you cannot reach by yourself...

Suspicious | :suss:

moreover, there are several of good graphical calculators on CP ; i doubt you search for that first (see here[^] for more)...

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Re: I need help (fatal + urgent) [edited - bis]

TA-RS14-Jul-05 13:02

TA-RS

14-Jul-05 13:02

I need help in drawing section for exp how ishoud draw sin(x)
and textbox that can be edited but when i refer to it it readed as string
i know vb but ihavn't enough time to neccessery cnversion

TA RedStar

Re: I need help (fatal + urgent)

Maximilien11-Jul-05 5:45

Maximilien

11-Jul-05 5:45

TA-RS wrote:
Scentefic Calculator

a calculator that smells ?

anyway ... where are you exactly in your project ?

Do you have problems with the UI ? the calculation part ? or the graph drawing functions ?

Maximilien Lincourt
Your Head A Splode - Strong Bad

Returning a date

Camron11-Jul-05 5:27

Camron

11-Jul-05 5:27

I'm very rusty, but I can't find any function on MSDN about returning a date. Can anyone help me?

Re: Returning a date

David Crow11-Jul-05 5:42

David Crow

11-Jul-05 5:42

Camron wrote:
...I can't find any function on MSDN about returning a date.

That does not stand for Microsoft Singles Dating Network! Big Grin | :-D

Have you tried time()?

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Re: Returning a date

Maximilien11-Jul-05 5:49

Maximilien

11-Jul-05 5:49

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: Returning a date

Indivara11-Jul-05 14:47

Indivara

11-Jul-05 14:47

Time Functions[^]
time, _time64[^]

(you need to look up "time" for date functions. kind of like pressing "start" to shutdown... Smile | :)

)

- Indivara

"...This city desert makes you feel so cold.
It's got so many people but it's got no soul..."
- Gerry Rafferty, Baker Street

ebitmap file

Anonymous11-Jul-05 5:26

Anonymous

11-Jul-05 5:26

in doc/view structure, how to load a bitmap file and display in a desired position in the view?
Thanx

MFC PreTranslatedMessage() ... opening dialog

majeric11-Jul-05 3:14

majeric

11-Jul-05 3:14

hi all

In PreTranslatedMessage() when recv WM_RBUTTONDOWN i open dialog but when im closing it... it crash the whole program why is that happen ?

source:

<br />
BOOL CMFCTestDlg::PreTranslateMessage(MSG * pMsg)<br />
{<br />
	switch(pMsg->message)<br />
	{<br />
	case WM_RBUTTONDOWN:<br />
	{<br />
            CSniff.DoModal();<br />
            // or trying modales with Create() it crash anyway when closing  <br />
            // that dialog<br />
	}<br />
<br />
	return 0;//CDialog::PreTranslateMessage(pMsg);<br />
}<br />

tnx you all...

Re: MFC PreTranslatedMessage() ... opening dialog

David Crow11-Jul-05 3:26

David Crow

11-Jul-05 3:26

I'm not sure exactly what it is that you are trying to do, but with few exceptions, PreTranslateMessage() is not the place to be doing it.

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.