Create a wav file using existing wav files - C / C++ / MFC Discussion Boards

hxhl954-Aug-07 6:42

4-Aug-07 6:42

If I remember correctly, CEditView and CScrollView are used for previewing...? I hardly ever use them, not too familiar. What I'm doing here is I'm getting a CString of all the text in the editbox (CEdit), then printing the CString line by line in a loop. That's why I need the number of lines Wink | ;)

. I'm not using CEditView or CScrollView here.

Re: Printing in MFC

bob169724-Aug-07 8:38

bob16972

4-Aug-07 8:38

Did you try CEdit::GetLineCount() and CEdit::GetLine()

I'm guessing it won't help too much though since the line count is probably based on it's visual representation in the CEdit window. Font metrics are quite tricky when attempting a WYSIWYG application on any arbitrary device; Especially with line breaks and font grid fitting involved.

However, it may be what your after so I thought I'd post it if you haven't come across it in MSDN yet.

Hope that helps.

Re: Printing in MFC

Bram van Kampen5-Aug-07 3:11

Bram van Kampen

5-Aug-07 3:11

Ever thought of Counting the Lines? (as in counting the number of'\n' chars in the CString? )

LateNightsInNewry

Re: Printing in MFC

hxhl955-Aug-07 9:56

hxhl95

5-Aug-07 9:56

Hmm...yeah, I did think of that, but what if the user turns word wrap on/off?

Creating Formatting Bar

.NET- India 3-Aug-07 9:23

.NET- India

3-Aug-07 9:23

How to create the formatting bar at run time as provided in this site for bold,italic and underline

Thnx & Regards
Manoj Bisht

Re: Creating Formatting Bar

David Crow3-Aug-07 10:35

David Crow

3-Aug-07 10:35

The Knowledge wrote:
How to create the formatting bar at run time as provided in this site for bold,italic and underline

Care to explain a bit further? Confused | :confused:

What is your VC++/MFC code (not) doing?

"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

Re: Creating Formatting Bar

Hamid_RT3-Aug-07 18:44

Hamid_RT

3-Aug-07 18:44

Can you more exaplain?

WhiteSky

Create a wav file using existing wav files

vikrant kpr3-Aug-07 7:56

vikrant kpr

3-Aug-07 7:56

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

Re: Create a wav file using existing wav files

mid=57413-Aug-07 17:07

mid=5741

3-Aug-07 17:07

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.

Re: Create a wav file using existing wav files

Karismatic3-Aug-07 20:38

Karismatic

3-Aug-07 20:38

Use the following links they may help u in merging wav files

http://www.codeproject.com/useritems/Concatenation_Wave_Files.asp
http://www.codeproject.com/audio/concatwavefiles.asp[^]

Regards,
Pankaj Sachdeva

"There is no future lies in any job"
"but"
"future lies in the person who holds the job"

AfxBeginThread() with a function in the main class

Johpoke3-Aug-07 5:59

Johpoke

3-Aug-07 5:59

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

Re: AfxBeginThread() with a function in the main class

led mike3-Aug-07 6:13

led mike

3-Aug-07 6:13

Well this is not a MFC thread but it can work in MFC applications and/or maybe it will help give you the idea

/** Win32 CreateThread class wrapper */
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(){}

/** start the thread */
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;
}
/** Thread function */
long WINAPI base_w32thread::threadfnc( LPARAM lp){

    assert( lp);
    base_w32thread* pThis = (base_w32thread*)lp;
    if( pThis)
        pThis->run();

    pThis->_handle = 0L;        // thread exited
    pThis->onEndThread();
    return 0L;
}

Re: AfxBeginThread() with a function in the main class

David Crow3-Aug-07 6:15

David Crow

3-Aug-07 6:15

What's wrong with:

void CMyDlg::Process( void )
{
    // do whatever you need to in this non-static method
}
...
/* static */ 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

Re: AfxBeginThread() with a function in the main class [modified]

Mark Salsbery3-Aug-07 6:20

Mark Salsbery

3-Aug-07 6:20

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++
Java | [Coffee]

Re: AfxBeginThread() with a function in the main class

Johpoke3-Aug-07 6:39

Johpoke

3-Aug-07 6:39

Thank you all for you great replies Smile | :)

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!

Smile | :)

//Johannes

Re: AfxBeginThread() with a function in the main class

Mark Salsbery3-Aug-07 6:45

Mark Salsbery

3-Aug-07 6:45

Fixed. Sorry about that Smile | :)

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++
Java | [Coffee]

Re: AfxBeginThread() with a function in the main class

Johpoke3-Aug-07 6:52

Johpoke

3-Aug-07 6:52

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

Re: AfxBeginThread() with a function in the main class

David Crow3-Aug-07 6:54

David Crow

3-Aug-07 6:54

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? Roll eyes | :rolleyes:

"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

Re: AfxBeginThread() with a function in the main class

Johpoke3-Aug-07 6:59

Johpoke

3-Aug-07 6:59

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

Re: AfxBeginThread() with a function in the main class

David Crow3-Aug-07 7:05

David Crow

3-Aug-07 7:05

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

Re: AfxBeginThread() with a function in the main class [Solved]

Johpoke3-Aug-07 7:12

Johpoke

3-Aug-07 7:12

I was thinking i must use it to gain access to the rest of the functions so i like tried :: on it but that didnt work. Now i tried -> on it and all my functions come up Big Grin | :-D

Thanks alot for the help. The only downside with this is im probably gonna have to go through loads of old programs and get rid of their ugly methods and add this. But i guess its worth it Big Grin | :-D

Thanks again Smile | :)

//Johannes

Re: AfxBeginThread() with a function in the main class

Ahmad Al-Maraghi4-Aug-07 1:50

Ahmad Al-Maraghi

4-Aug-07 1:50

u don't understand the problem Frown | :(