C / C++ / MFC Discussion Boards

toxcct22-Dec-05 3:17

22-Dec-05 3:17

in fact, to remenber it in the future here are the tips :

(CString)str
this is a C-Style cast (explicit cast of str to CString)

CString(str)
this calls explicitely the CString constructor that get a parameter of the type of str, to create a temporary object that will be passed then to the calling function (in our case).

hope this is helpful Wink | ;)

TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VisualCalc 3.0]

Re: CString+=

kakan22-Dec-05 19:53

kakan

22-Dec-05 19:53

Hello and thanks for the tip. Smile | :)

I really have to start testing my code before I reply to questions.
I've made more than one mistake... Blush | :O

Problem in storing G.729 Decoded audio

BlrBoy21-Dec-05 23:13

BlrBoy

21-Dec-05 23:13

Hello All

I am writing an application to store the RTP packets payload to audio files.

Now I am working on G.729 Codec. I am storing decoded G.729 payload in .WAV file. But the audio converstation is not stored properly.

I hope Decoding is done properly (Function is not returning ERROR). Extracting the payload is proper.

WAV file header details what I am stroing
Compression Code : 1 (PCM/uncompressed)
Channel: 1
Samples Per Sec: 8000
Bits per sample: 16

Let me know is my procedure is correct? After decoding let me know what is the format of the audio we get?

My application works fine for G.711 codec.

Thanks for your time
Ravi

Re: Problem in storing G.729 Decoded audio

J512198220-Feb-06 22:55

J5121982

20-Feb-06 22:55

your audio initialization is correct.

may i know about your codec.

JAYARAJ

problem with list control

QuickDeveloper21-Dec-05 22:39

QuickDeveloper

21-Dec-05 22:39

Hai,could any one pls help me out.....
I have statically created a splitter window with 2 views one is derived from CTreeView and the other from CListView.Then i have managed to insert items into the tree view retrieving from the database. Now i want to insert some columns into the listview but i couldn't do so since the style of the list view is to be LVS_REPORT . But, initially the style is LVS_SMALL.I don't find any way to change this style property using msdn functions.

Please tell me either how to change the style property or how to insert the columns into the listview as above.

-- modified at 4:40 Thursday 22nd December, 2005

Re: problem with list control

khan++21-Dec-05 22:54

khan++

21-Dec-05 22:54

Change the style:
m_List.ModifyStyle(0,LVS_REPORT);

Insert a few columns:

m_List.InsertColumn(0,"abcd");<br />
m_List.InsertColumn(1,"efgh");

this is this.

Re: problem with list control

Owner drawn21-Dec-05 22:58

Owner drawn

21-Dec-05 22:58

SetWindowLong(....)

Happy christmas friends. May the Love of My Lord and Saviour Jesus bring forth Joy and Happiness into your life too.
<marquee direction="up" height="50" scrolldelay="1" step="1" scrollamount="1" hspace="2" vspace="2">
--Owner Drawn
--Nothing special
--Defeat is temporary but surrender is permanent
--Never say quits
--Jesus is Lord

How to get output from speaker?

Zyraph21-Dec-05 22:26

Zyraph

21-Dec-05 22:26

I need to display some visualizations base on output sound from speaker.
How could I do that? (No DirectX)

Re: How to get output from speaker?

Sebastian Schneider21-Dec-05 23:57

Sebastian Schneider

21-Dec-05 23:57

Get a flipchart and a pen. Open the flipchart and pump up the sound. Then, each time you hear a drum, move your pen up and down, while, during the song, slowly moving your pen from one side of the chart to the next.

If you do not want to use DirectX, try using an A/D-converter to feed your data back to the PC (USB or Legacy Ports).

Cheers,
Sebastian

--
Contra vim mortem non est medicamen in hortem.

Re: How to get output from speaker?

Sebastian Schneider22-Dec-05 2:56

Sebastian Schneider

22-Dec-05 2:56

If I was you, I would try, lets say, the Audacity source. Audacity is an open-source sound/wave editor/filterset, which might save you a lot of work.

They should do something like that somewhere.

If I was to record my own sound on the computer, I would retrieve the input from "Stereo Mixer" (which should also contain every sound your computer currently is playin, because it remixes the output stream into the input stream.

Cheers,
Sebastian

--
Contra vim mortem non est medicamen in hortem.

how do i convert exe into windows 2000 service

trinadh_t21-Dec-05 21:37

trinadh_t

21-Dec-05 21:37

Hi,

I need to convert exe into windows 2000 service using vc++.

Can anybody suggest me how to do it.

Re: how do i convert exe into windows 2000 service

ThatsAlok21-Dec-05 21:52

ThatsAlok

21-Dec-05 21:52

trinadh_t wrote:
I need to convert exe into windows 2000 service using vc++.

Start Your Windows Programs From An NT Service[^]

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

Re: how do i convert exe into windows 2000 service

trinadh_t21-Dec-05 22:07

trinadh_t

21-Dec-05 22:07

thanks for giving me reply,

but i dont hav NT service in my pc. I hav windows 2000 professional in my PC. Can u tell me briefly how to do that.

regards
triadh

Re: how do i convert exe into windows 2000 service

ThatsAlok21-Dec-05 23:08

ThatsAlok

21-Dec-05 23:08

trinadh_t wrote:
but i dont hav NT service in my pc. I hav windows 2000 professional in my PC

2000 is nothing just advance version of NT.... Please read that article... that contain readymade solution for your need

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

SHChangeNotifyRegister API

ragavan21-Dec-05 19:10

ragavan

21-Dec-05 19:10

Hi Does anyone know how to use the SHChangeNotifyRegister API in a service.

Re: SHChangeNotifyRegister API

Owner drawn21-Dec-05 19:55

Owner drawn

21-Dec-05 19:55

Hope this helps...

http://www.codeproject.com/shell/shchangenotifyregister.asp[^]

deleting memory allocated by NEW

vikas amin21-Dec-05 19:07

vikas amin

21-Dec-05 19:07

I have created a charater pointer which points to
a string . I need to copy an existing string in the
char pointer i created so i did this

In my class the code is as

char *m_FileName;<br />
m_FileName=new char[strlen(FileName)];  <br />
strcpy(m_FileName,FileName);

In the destructor of the class

<br />
~Class_temp()<br />
{<br />
	if(m_FileName!=NULL)<br />
        delete []m_FileName;<br />
}

I get a error at the delete keyword ,

Damage After normal Block 0x00000034

am i wrong some where

Vikas Amin
Embin Technology
Bombay
vikas.amin@embin.com

Re: deleting memory allocated by NEW

GflPower21-Dec-05 20:01

GflPower

21-Dec-05 20:01

delete m_FileName;//

d

Re: deleting memory allocated by NEW

Owner drawn21-Dec-05 20:22

Owner drawn

21-Dec-05 20:22

This won't work coz it's an array of memory.

Re: deleting memory allocated by NEW

Cedric Moonen21-Dec-05 20:31

Cedric Moonen

21-Dec-05 20:31

When using new[] you MUST always use delete[], no matter if you allocate an array of char.

Re: deleting memory allocated by NEW

Cedric Moonen21-Dec-05 20:29

Cedric Moonen

21-Dec-05 20:29

FileName is a zero-terminated string and strlen returns the number of charachters WITHOUT counting the '\0' char. When you allocate your new string, you need to allocate for one extra character otherwise when you make the copy, the ending zero will be written outside the boudaries of your allocated memory.

Instead of
m_FileName=new char[strlen(FileName)];
Write:
m_FileName=new char[strlen(FileName)+1];

Re: deleting memory allocated by NEW

khan++21-Dec-05 20:35

khan++

21-Dec-05 20:35

You should allocate space for one more character than the length of the string:
m_FileName = new char[strlen(FileName)+1];

Also you should initialize m_FileName to NULL in the constructor:
m_FileName = NULL;

this is this.

Re: deleting memory allocated by NEW

vikas amin21-Dec-05 20:44

vikas amin

21-Dec-05 20:44

Yeh i initialised
m_FileName = NULL;

but thanks for the suggestion that i should
add one more memory space for termination
charater .

But it dont work to solve my problem

Vikas Amin
Embin Technology
Bombay
vikas.amin@embin.com

Re: deleting memory allocated by NEW

Bob Stanneveld21-Dec-05 20:56

Bob Stanneveld

21-Dec-05 20:56

Hello,

After the modification of the +1, your code should work. Are you modifying the string elsewhere?

Behind every great black man...
... is the police. - Conspiracy brother

Blog[^]

Re: deleting memory allocated by NEW

lastgen21-Dec-05 21:08

lastgen

21-Dec-05 21:08

Also either call
memset(m_FileName,0,(strlen(FileName)+1));
after the new,

or call
m_FileName[strlen(FileName)] = '/0';
after strcpy.

These sort of issues are commonly caused by the program not seeing the end of the string and it overruns it's buffer.

Another possible issue is if you are assigning a pointer to that string elsewhere that is still using it. Check the debugger to ensure anything that needs to reference the string stored in m_FileName after it's deleted has made it's own copy.

eg. code like this is BAD

class MyClass
{
private:
char* mystring;
public:
void SetMyString(const char* const newstring) { mystring = newstring; }
};

void somefunction()
{
MyClass mc;

const char* conststring = "test me"

char* addstring = new char*[strlen(conststring)+1];
memset(addstring, 0, strlen(conststring)+1); // strlen(conststring)+1 could be assigned to an integer

strcpy(addstring, conststring);

mc.SetMyString(addstring);

delete[] addstring; // BAD - because mc now contains an invalid pointer!!!!!
}

-- modified at 3:12 Thursday 22nd December, 2005

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