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Hey Friends
Any idea how i can create a wav file so that
Output = 1.wav(in background & repeated) + 2.wav (in foreground & repeated)
Regards
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If the wave files both contain PCM data, you can perform a crude mix by grabbing a sample from each file and summing them in the ratio you want. If you want a 70/30 mix, multiply the sample from 1.wav by 0.7 and the sample from 2.wav by 0.3. Add the two values and write to a new wave file. If the files have different sampling frequencies, bit depths, or numbers of channels, you'll have to do some processing to make them equivalent to each other before summing the samples.
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This is allways something wich i have had trouble with, usualy i end up doing some ugly trick to make it work.. But this time i cant.. (well ive been spending around 3 days trying..) I need a thread which is connected to the main class of my MFC Dialog based application. I looked at Code Project:Using AfxBeginThread...[^] In which i end up createing a new static function that seems to work with some functions.. But when i tried calling the function i wanted it to run, it couldnt since it wasnt a static function.. So i tried making it a static function, but then i got loads of error messages...
So how would i go about creating and running a thread that is connected to the main class (like "CThreadDemoDlg::OnStart()" ) ?
The function doesnt need any params or other advanced features, maybe i should start it using a differnt function?
Or how should i go about this?
thanks!
PS: Im not really that good at the terminology for c++, or c++ programming itself, so nothing too hightech or advanced unless its a must do..
//Johannes
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Well this is not a MFC thread but it can work in MFC applications and/or maybe it will help give you the idea
class base_w32thread{
protected:
HANDLE _handle;
DWORD _dwTID;
base_w32thread():_handle(0), _dwTID(0L){}
virtual ~base_w32thread()=0;
public:
bool start(LPSECURITY_ATTRIBUTES psecattrs = NULL, DWORD dwCreateFlags = 0L);
operator HANDLE(){ return _handle; }
protected:
virtual void run()=0;
virtual void onEndThread(){}
static long WINAPI threadfnc( LPARAM lp);
};
#include "StdAfx.h"
#include "base_w32thread.h"
#include <winbase.h>
#include <assert.h>
base_w32thread::~base_w32thread(){}
bool base_w32thread::start(LPSECURITY_ATTRIBUTES psecattrs, DWORD dwCreateFlags){
assert( !_handle);
if( _handle)
return false;
_handle = ::CreateThread( psecattrs, 0,
(LPTHREAD_START_ROUTINE)threadfnc, this, dwCreateFlags, &_dwTID);
return (_handle)?true:false;
}
long WINAPI base_w32thread::threadfnc( LPARAM lp){
assert( lp);
base_w32thread* pThis = (base_w32thread*)lp;
if( pThis)
pThis->run();
pThis->_handle = 0L;
pThis->onEndThread();
return 0L;
}
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What's wrong with:
void CMyDlg::Process( void )
{
}
...
UINT CMyDlg::Process( LPVOID pParam )
{
CMyDlg *pDlg = (CMyDlg *) pParam;
pDlg->Process();
return 0;
}
...
AfxBeginThread(Process, this);
"A good athlete is the result of a good and worthy opponent." - David Crow
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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The thread procedure accepts a void pointer which you can pass when you create the thread.
If you pass a pointer to an object of a class then you will have access to that object from the
thread. If the thread proc is a static member function of that class, you have complete access
(to public/protected/private members).
class CThreadDemoDlg : public CDialog
{
<font face="Courier New"> static UINT __cdecl MyThreadProc(LPVOID pParam);</font>
protected:
<font face="Courier New">CWinThread *pAnotherThread;
</font>public:
void SomeThreadStarterFunc();
};
<font face="Courier New">void </font><font face="Courier New">CThreadDemoDlg::</font><font face="Courier New">SomeThreadStarterFunc()
{
pAnotherThread = AfxBeginThread(&</font><font face="Courier New">CThreadDemoDlg::MyThreadProc, this);
}
UINT __cdecl </font><font face="Courier New">CThreadDemoDlg::MyThreadProc(LPVOID pParam)
{
</font><font face="Courier New">CThreadDemoDlg *pMyDlg = (</font><font face="Courier New">CThreadDemoDlg *)pParam</font><font face="Courier New">;
...</font><font face="Courier New"><font><font></font></font>
}</font>
Mark
Last modified: 25mins after originally posted --
Mark Salsbery
Microsoft MVP - Visual C++
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Thank you all for you great replies
Im trying out Mark's code right now, but its giving me an error message i really dont understand..
On this line:
CThreadDemoDlg *pMyDlg = (CThreadDemoDlg *pParam);
error C2146: syntax error : missing ')' before identifier 'pParam'
error C2059: syntax error : ')'
Ive renamed all the classes to the class on my program, so its not that... What could this be?
Thank you all!
//Johannes
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Fixed. Sorry about that
It should be
<font face="Courier New">CThreadDemoDlg *pMyDlg = (</font><font face="Courier New">CThreadDemoDlg *)pParam</font><font face="Courier New">;</font>
Mark Salsbery
Microsoft MVP - Visual C++
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Ah yes now it compiles, thanks.
But when i add a function to it (one that is connected to CThreadDemoDlg) i get the cant call a nonstatic member function..
error C2352: 'CThreadDemoDlg::SomeFunction' : illegal call of non-static member function
see declaration of 'SomeFunction'
So how should i go about calling the function?
thanks again!
//Johannes
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Johpoke wrote: So how should i go about calling the function?
Can you at least bother to show the code that is producing this error?
"A good athlete is the result of a good and worthy opponent." - David Crow
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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Doh,
UINT __cdecl CThreadDemoDlg::MyThreadProc(LPVOID pParam)<br />
{<br />
CThreadDemoDlg *pMyDlg = (CThreadDemoDlg *)pParam;<br />
<br />
MyFunction();<br />
<br />
return 1;<br />
}
It looks exactly like that, except the names are different
//Johannes
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Hint: Ever wonder what pMyDlg is being used for?
"A good athlete is the result of a good and worthy opponent." - David Crow
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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u don't understand the problem
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Johpoke wrote: but its giving me an error message i really dont understand..
You don't understand a syntax error message but you are working with multi threading *sigh* different day same old garbage
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led mike wrote: *sigh* different day same old garbage
This[^] should cheer you up.
Mark Salsbery
Microsoft MVP - Visual C++
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lol, that dancing dude is funny/weird.
My program now works perfectly, thank you all for you help.
How does one make that dude anyway? i cant find him...
//Johannes
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Johpoke wrote: My program now works perfectly
If it works, do it.
If it works, do it it works
seems to work probably
^ ^
If it works, do it it works
seems to work probably
^ ^
If it works, do it it works
(and might work again)
Cogito ergo sum
(although, admittedly, that is an assumption)
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Johpoke wrote: How does one make that dude anyway? i cant find him...
It's right next to the one.
With a little ingenuity, you'll find it
Mark Salsbery
Microsoft MVP - Visual C++
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Maybe its like a gold-member only emotion. or maybe it doesnt like me...
Ah well doesnt matter im happy anyway
//Johannes
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Johpoke wrote: Maybe its like a gold-member only emotion.
Nope. I was so proud when I found it all by myself, since I know nothing about web programming
Mark Salsbery
Microsoft MVP - Visual C++
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Mark Salsbery
Microsoft MVP - Visual C++
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