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hi all,
I have the following coding to extract audio from video..
void CWave::ReadWaveFile(unsigned long *sp_long_In)<br />
{<br />
char *sp_char, cConst[3];<br />
char cBuf[3];<br />
unsigned long *sp_long;<br />
int i, j;<br />
int iflag;
WAVE_CHARTOLONG Wave_chartolong;<br />
<br />
sp_char = m_DECbuf;<br />
m_DECwavdata = new unsigned long[m_DECcount]; <br />
sp_long = sp_long_In;<br />
cConst[0] = 'P';<br />
cConst[1] = 'C';<br />
cConst[2] = 'M'; <br />
i = 1;<br />
j = 0;<br />
while( i <= (m_DECcount * 2))<br />
{<br />
sp_char = m_DECbuf + sp_long[i]; Wave_chartolong.CharBuff[0] = *(sp_char + 4); <br />
Wave_chartolong.CharBuff[1] = *(sp_char + 5);<br />
Wave_chartolong.CharBuff[2] = *(sp_char + 6);<br />
Wave_chartolong.CharBuff[3] = *(sp_char + 7);<br />
sp_char += Wave_chartolong.UL; <br />
memcpy(cBuf, sp_char, 3);<br />
iflag = memcmp(cBuf, cConst, 3);<br />
if(iflag == 0)<br />
{ <br />
m_DECwavdata[j] = (unsigned long)sp_char; <br />
j = j + 1;<br />
}<br />
i += 2;<br />
<br />
}<br />
<br />
ReadyPlayWave();<br />
}
void CWave::ReadyPlayWave()<br />
{<br />
lpFormat = new WAVEFORMATEX;<br />
lpFormat->wFormatTag = 1;<br />
lpFormat->nChannels = 1;<br />
lpFormat->nSamplesPerSec = 7500;<br />
lpFormat->nAvgBytesPerSec = 7500;<br />
lpFormat->wBitsPerSample = 8;<br />
lpFormat->nBlockAlign = 1;<br />
lpFormat->cbSize = 0;<br />
<br />
}
Can any one please review it.
here Audio is extracted in ReadWave file and we can play the video by ReadyPlaywave ().
I can able to play audio.but i have to save that audio in .wav format.Is it posiible.
how to do that.
help me plzz
Thanks,
Sunita
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See Here[^] maybe it is some helpful to you
whitesky
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 How to Extract information stored in the main part of any Message box window after it displays on Desktop?
I want to retreive all the arguments send to Message box. The Message box is owned by a different application.
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No matter who owns the messgae box. After something is displayed on the screen, it is no more available as text it will be bitmap. You will need to use OCR. I dont know if there is an alternative. I dont know if GetWindowText() will work. But you will need the handle of that window still.
![Rose | [Rose]](https://www.codeproject.com/script/Forums/Images/rose.gif)
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Aljechin wrote: I dont know if GetWindowText() will work. But you will need the handle of that window still.
I Believe thats not the Solution!
"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
Support CRY- Child Relief and You
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Aljechin wrote: GetWindowText()
I guess this would work only to catch its caption.
<marquee scrollamount="1" scrolldelay="1" direction="up" height="10" step="1">--[V]--
[My Current Status]
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VuNic wrote: I guess this would work only to catch its caption.
for getting text of particular Window of other process you have to us WM_GETTEXT message!
"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
Support CRY- Child Relief and You
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hmm... thanks thanks.. so this works different from the GetWindowText??
<marquee scrollamount="1" scrolldelay="1" direction="up" height="10" step="1">--[V]--
[My Current Status]
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VuNic wrote:
hmm... thanks thanks.. so this works different from the GetWindowText??
Would you like to read that your Self in the MSDN or you like to explaination by Me! 
"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
Support CRY- Child Relief and You
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Nope, I'm in the middle of some process here, so I just put the question further there , If it worries you, leave it. I'll look about it in MSDN later. No problem!
<marquee scrollamount="1" scrolldelay="1" direction="up" height="10" step="1">--[V]--
[My Current Status]
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VuNic wrote: I'm in the middle of some process here,
Process HUMM...................
VuNic wrote: so I just put the question further there
Then let me Explain, i am kiddin... By Design GetWindowText only Bring Caption of Window , remember by design. but GetWindowText use WM_GETTEXT internally!
"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
Support CRY- Child Relief and You
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VuNic wrote: I'm in the middle of some process here, so I just put the question further there ,
Humm Process
VuNic wrote: o I just put the question further there
Actually By Design GetWindowText Brings the Caption of the Remote Window, remember by Design.though interally it make call to the WM_GETTEXT!
"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
Support CRY- Child Relief and You
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VuNic wrote:
I'm in the middle of some process here, so I just put the question further there ,
Humm Process
VuNic wrote:
o I just put the question further there
Actually By Design GetWindowText Brings the Caption of the Remote Window, remember by Design.though interally it make call to the WM_GETTEXT!
"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
Support CRY- Child Re
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Yup Alok, that's what I knew, it would internally use GETTEXT, but why does this get supressed when its called by GetWindowText? I tried to take the text off a notepad, but I failed there. Actually I got the handle of notepad's client window from spy ++ and tried GetWindowText, but didn't work. so you mean, here sending GETTEXT would work??
<marquee scrollamount="1" scrolldelay="1" direction="up" height="10" step="1">--[V]--
[My Current Status]
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VuNic wrote: but didn't work. so you mean, here sending GETTEXT would work??
By Design GwtWindowText bring the Caption of Window
"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
Support CRY- Child Re
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Do the following
1. if u dont have the window(messsagebox) get it using FindWindow or some other API
2. GetNextWindow (pass GW_CHILD) as the flag to find the window.
I donno in which order the windows has placed in teh message box. so iterate till end.
3. Use GetWindowText by passing the find result.
this is applicable if the message box is created using normal MessageBox API.
SaRath
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SaRath C wrote: 1. if u dont have the window(messsagebox) get it using FindWindow or some other API
Sorry if Sound Rude, how will determine that is messagebox window as it Normal Dialog Box!
"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
Support CRY- Child Relief and You
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Javagal Srinath wrote: want to retreive all the arguments send to Message box. The Message box is owned by a different application.
Hook MessageBox api !
"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
Support CRY- Child Relief and You
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I feel it is very difficult to solve this problem. But I believe there is a solution for all problems. So here is a spark:
We can manually copy the entire text and caption form a message box using Ctrl+C (am not sure, will it work for all the message boxes).
Check the link :
http://secretgeek.net/msgbox_copy.asp
http://weblogs.asp.net/chuckop/archive/2004/04/08/110153.aspx
So my idea is:
What about simulating the Ctrl + C and take the text from clipboard?
It is only a spark 
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Anybody please send me a code of How to concatenate 2 .wav files with different frequencies in c++ or qt 3.3.2 please please
malya
-- modified at 5:29 Monday 29th May, 2006
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I don't know if it is possible to save a wave file with different frequency (Fc), so I think that there is only a solution: convert the files to have got a single Fc.
To do this choose the highest Fc, and create more samples in the other file using an interpolator (ex. linear interpolation).
Then you can append the files.
Do not choose the lower Fc to do this, because the file with the highest Fc it is not simple to be undersampled: see aliasing problem!
hope that helps
Cheers,
Russell
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hi again 
I saw in some code such thing :
(it was a mathematical formula parser)
try
{
...
}
catch(CException1 pError)
{
...
}
catch(CException2 pError)
{
...
}
catch(CException3 pError)
{
...
}catch(CException4 pError)
{
...
}
catch(CException5 pError)
{
...
}
catch(CException6 pError)
{
...
}
I have question : Is not it uncomfortable to write so many catches ? when all theses exceptions are some what related, could not we unite them under some CMainException class and catch only one exception ?
this code is from this article :
http://www.codeproject.com/cpp/VisualCalc.asp
From the Using the Code section
But the article is verry coool ![Rose | [Rose]](https://codeproject.freetls.fastly.net/script/Forums/Images/rose.gif)
-- modified at 4:15 Monday 29th May, 2006
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Catch(...)
and then
GetLastError()
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GetLastError will not help u in all cases.
it applicable if only if the library set the relevant errors
u may have to design ur own class if the exception is not provded by windows or the library u are using. if it is a generic one, then the code will be very less.
there are centralized and decentralized error handling strategy. select one which suits for u. if u r trying to reduce code, go for centralized one. but the common routine or class will be bulky because of this 
SaRath
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