C / C++ / MFC

Re: Overloading Constructors - call complex from simple?

4-Jun-09 7:15

You want C++ 0x[^]. Unfortunately, it's not finalised, much less fully implemented Smile | :)

I would use the 'constructor method' approach personally.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

led mike4-Jun-09 7:43

led mike

4-Jun-09 7:43

Stuart Dootson wrote:
much less fully implemente

Yeah, I already checked 2008 feature pack, not there. Sniff | :^)

Re: Overloading Constructors - call complex from simple?

Stuart Dootson4-Jun-09 7:47

Re: Overloading Constructors - call complex from simple?

4-Jun-09 7:47

They're not going to be in VS2010 either, AFAIK - it'll have some C++0x features, but not that one.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

led mike4-Jun-09 8:02

led mike

4-Jun-09 8:02

That's not good news. But at least tomorrow is still FRIDAY! Jig | [Dance]

Re: Overloading Constructors - call complex from simple? [modified]

fiddleus5-Jun-09 8:09

fiddleus

5-Jun-09 8:09

The issue is that a standalone constructor call is creating a new instance that you do nothing with, then exits not having actually initialized anything in the instance it was called for.

It may be a bit of a hack, but for my class I was able to get away with the method below. Really, though, anything with a properly overloaded operator= should be fine, I think.

CClass::Class()
{
   int iDefault = 1000.0f;
   *this = Class( iDefault );
}

Edit: Frankly, though, I feel like I'm brain-farting on something here. I, too, expected it to work like you originally detailed.

modified on Friday, June 5, 2009 2:19 PM

TTS: Calculating the resulting length (in ms) of a synthesized audio stream.

Souldrift4-Jun-09 4:15

Souldrift

4-Jun-09 4:15

Hi there,

I might be in the wrong place here, but lacking another idea where to post, I give it a shot.

I am presently developing in the audio/speech streaming area. I built a TTS system that works quite nicely, streaming (via RTP) the audio in small data packages, which contain the samples. Each 16-bit linear sample is stored in a short.
Now I was wondering if there is any possibility to somehow calculate how long the resulting audio file will be (or was), in miliseconds.

There are programs that do it, like Audacity, so I should be able to get there, as well. Only I don´t have a clue.

Any ideas?

Souldrift

Re: TTS: Calculating the resulting length (in ms) of a synthesized audio stream.

molesworth4-Jun-09 4:34

molesworth

4-Jun-09 4:34

If you're creating the samples in your own system, then surely you should be able to just work it out from no. samples / sample rate. (* 1000 if you want it in milliseconds.)

Or are you using an external library or app to create the audio?

There are three kinds of people in the world - those who can count and those who can't...

Re: TTS: Calculating the resulting length (in ms) of a synthesized audio stream.

Souldrift4-Jun-09 4:44

Souldrift

4-Jun-09 4:44

Haha, of course, it´s so easy. I found out myself just now.
But thanks a lot. Your hint was the one I was looking fro.

I am actually using an external lib to synthesize the text. But of course I have the number of samples and the sample rate.

Thanks again ... and I just found this (if anyone is interested) to verify my own calculations:

http://www.angelfire.com/ga/bunnycymru/sound.html[^]

Cheers

Souldrift

CWnd* CWnd::GetDlgItem(int nID) const crashed?

transoft4-Jun-09 3:54

transoft

4-Jun-09 3:54

Hi

What kind of reason will cause program crashed at:

CWnd* CWnd::GetDlgItem(int nID) const
{
-----> ASSERT(::IsWindow(m_hWnd));

}

Thank you very much,

KarstenK4-Jun-09 4:06

KarstenK

4-Jun-09 4:06

let my guess: "m_hWnd" IS NOT a Window Laugh | :laugh:

Press F1 for help or google it.
Greetings from Germany

Rajesh R Subramanian4-Jun-09 4:08

Rajesh R Subramanian

4-Jun-09 4:08

It is a crappy thing, but it's life -^ Carlo Pallini

norish4-Jun-09 4:48

4-Jun-09 4:48

Did you call GetDlgItem after CDialog::OnInitDialog processed? The m_hWnd will not be created before that called.
Check the m_hWnd value is NULL or not.

transoft4-Jun-09 5:08

transoft

4-Jun-09 5:08

Yes, I call GetDlgItem in dialog implementation. But It crashed.

What is going on?

Thanks,

norish4-Jun-09 6:25

How to use a function return value as array size

4-Jun-09 6:25

check;
1) m_hWnd was NULL or not?
- if it was NULL, dialog window has not been created yet.
- if not NULL, some other code overwrite the member. (might be memory bug)
2) GetDlgItem should not call in dialog constructor but can do in OnInitDialog or after this processed.
- this is conclusion from above NULL reason.

Joschwenk6664-Jun-09 3:50

Joschwenk666

4-Jun-09 3:50

Hi,

I try to initialize an array with a function return, but i get error C2057: expected constant expression. Is there an easy solution for the following problem?

const int iRecordCountBefore = p_rs->GetRecordCount();
int iRsPositionsUpdated[iRecordCountBefore] = {-1};

Thanks you!

Re: How to use a function return value as array size

norish4-Jun-09 3:59

Re: How to use a function return value as array size

4-Jun-09 3:59

You cannot write such array code in C or C++ program syntax.
You should change like below;

const int iRecordCountBefore = p_rs->GetRecordCount();
// if you use C++ syntax
int* iRsPositionsUpdated = new int[iRecordCountBefore];
// otherwise C syntax
int* iRsPositionsUpdated = (int*)malloc(sizeof(int)*iRecordCountBefore);
// if you want to initialize with -1 below dose
memset(iRsPositionsUpdated, -1, sizeof(int)*iRecordCountBefore);

Joschwenk6664-Jun-09 4:10

Joschwenk666

4-Jun-09 4:10

Thank you for the working and fast answer!

Re: How to use a function return value as array size

Cedric Moonen4-Jun-09 4:18

Cedric Moonen

4-Jun-09 4:18

Don't forget to delete (if you used new) or free (if you used malloc) the memory when you don't need it anymore, otherwise it might lead to memory leaks.

Cédric Moonen
Software developer

Charting control [v2.0]
OpenGL game tutorial in C++

Re: How to use a function return value as array size

Stuart Dootson4-Jun-09 7:19

VS2008 MFC project. Broken Wizard ...

4-Jun-09 7:19

Can I suggest using a std::vector rather than an array, if only so you don't need to bother remember freeing memory? This will create a vector initialised with iRecordCountBefore integers, all set to -1.

const int iRecordCountBefore = p_rs->GetRecordCount();
std::vector<int> iRsPositionsUpdated(iRecordCountBefore, -1);

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Jerry Evans4-Jun-09 3:18

Jerry Evans

4-Jun-09 3:18

The VS2008 dialog event wizard has stopped working. Double-clicking on a button in an MFC dialog project does not fire the wizard as usual and a right-cliok to get to the 'Add Event Handler...' shows a dialog with no message types.

Further to this the MFC message mapping and virtual class listing that generally appears in the properties window (Alt + Enter) is now empty.

Has anyone elese seen this and if so, how'd they fix it? I have 'repaired' my VS08 installation ...

Thx++

Jerry

Re: VS2008 MFC project. Broken Wizard ...

Stuart Dootson4-Jun-09 7:21

Re: VS2008 MFC project. Broken Wizard ...

4-Jun-09 7:21

Have you recently installed IE8? That thoroughly shafted code wizards on my PC. I fixed it using this approach[^].

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Jerry Evans4-Jun-09 7:24

Jerry Evans

4-Jun-09 7:24

you champion, you. i spent hours trying to get the right google search phrase.

How to change icon at upper left corner of window

pandit844-Jun-09 3:18

pandit84

4-Jun-09 3:18

HI i did this :

HICON hIcon = LoadIcon(0,MAKEINTRESOURCE (IDI_ADV_DATA));
        GetDlgItem(IDD_HPCR_WO_DLG ).SetIcon (hIcon ,0);

but my icon in upper left corner of my window is still showing default one.

Re: How to change icon at upper left corner of window

norish4-Jun-09 4:06