🚀 go-pugleaf

Hi!

I forget to change CALLBACK_WINDOW to CALLBACK_THREAD.

But it still doesn't work. waveOutOpen still returns "invalid parameter"

(for handle I use this->Handle - and this is thread class).


Mike

Mike wrote:

> Hi!
>
> I have a problem with threads.
>
> I have a thread which controls playback of a WAVE file.
>
> And for controlling it I have to get a handle of thread. But handle
> which I get with "this->handle" isn't the right handle (if I use for
> example "Form1->handle" everything works). So, how can I
> get an "right" handle?
>
> Can I make a message map for thread (I have to process some
> messages which are sent (playbacking events)) - and they are
> sent to the handle, which I sent previously. But that handle isn't
> correct, so what's wrong?
>
> Please help
>
> Mike

Mike
	Are you trying to post a windows message to your thread???  If
that is what you are doing then you need to use PostThreadMessage
instead of PostMessage.   The PostThreadMessage takes a ThreadID
instead of a handle.  If this is not what you are tying to do, then I
need more information..

Mike

On Thu, 23 Aug 2001 10:31:19 +0200, Mike <someone@somewhere.com>
wrote:

>Hi!
>
>I have a problem with threads.
>
>I have a thread which controls playback of a WAVE file.
>
>And for controlling it I have to get a handle of thread. But handle
>which I get with "this->handle" isn't the right handle (if I use for
>example "Form1->handle" everything works). So, how can I
>get an "right" handle?
>
>Can I make a message map for thread (I have to process some
>messages which are sent (playbacking events)) - and they are
>sent to the handle, which I sent previously. But that handle isn't
>correct, so what's wrong?
>
>Please help
>
>
>Mike
>

Mike, I will post the code tommorow, not at my working computer right now.

Michael Crapo <mcrapo@tng-ida.com> wrote in message
news:3b852215.700166@newsgroups.borland.com...
> Mike
> Are you trying to post a windows message to your thread???  If
> that is what you are doing then you need to use PostThreadMessage
> instead of PostMessage.   The PostThreadMessage takes a ThreadID
> instead of a handle.  If this is not what you are tying to do, then I
> need more information..
>
> Mike
>
> On Thu, 23 Aug 2001 10:31:19 +0200, Mike <someone@somewhere.com>
> wrote:
>
> >Hi!
> >
> >I have a problem with threads.
> >
> >I have a thread which controls playback of a WAVE file.
> >
> >And for controlling it I have to get a handle of thread. But handle
> >which I get with "this->handle" isn't the right handle (if I use for
> >example "Form1->handle" everything works). So, how can I
> >get an "right" handle?
> >
> >Can I make a message map for thread (I have to process some
> >messages which are sent (playbacking events)) - and they are
> >sent to the handle, which I sent previously. But that handle isn't
> >correct, so what's wrong?
> >
> >Please help
> >
> >
> >Mike
> >
>

Hi!

So, I read help about threads and WAVE playback and I found out
that for me it would be the best to use "callback function". And, so,
I have some questions about it.

I have an thread which is created when I would like to playback
WAVE file (and if I would like to use "thread callback" there would
be yet another one, wouldn't be?), but I need very accurate playback
(without dropping any samples and that it would be as real-time
as it is possible (so little buffers, because WAVE files is generated
in real time)), so "callback function" is what I need.

How can I declare it (so that I can than with an argument
(DWORD)WaveProc give waveOutOpen function's location (so that it
would know what to call))? I tryed this

void CALLBACK WaveProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM
lParam) {
... I left code for function the same

but I get illegal operations

Maybe I should make it thread-function (how?)?

And what's the priority of this function (it's default or it is thread's
priority)?


Mike

Hello, Here is a thread example:

DWORD CALLBACK ThreadFunc(void* P)
{
 HDC DC=GetDC(Form1->Handle);

PlaySound("c:\\Key.wav",NULL,SND_FILENAME);
ReleaseDC(Form1->Handle, DC);

 return 0;
}

void __fastcall TForm1::PlaySoundInThread()    file://play sound in edit
boxes
{
  DWORD ThreadID;

HANDLE hthread = CreateThread(0,0,ThreadFunc, 0,0, &ThreadID);
}


So to play the sound in the thread on a button click just use this line
instead of playsound(),

PlaySoundInThread();

Goodluck.

Mike <someone@somewhere.com> wrote in message
news:3B8632A5.5F1864A9@somewhere.com...
> Hi!
>
> So, I read help about threads and WAVE playback and I found out
> that for me it would be the best to use "callback function". And, so,
> I have some questions about it.
>
> I have an thread which is created when I would like to playback
> WAVE file (and if I would like to use "thread callback" there would
> be yet another one, wouldn't be?), but I need very accurate playback
> (without dropping any samples and that it would be as real-time
> as it is possible (so little buffers, because WAVE files is generated
> in real time)), so "callback function" is what I need.
>
> How can I declare it (so that I can than with an argument
> (DWORD)WaveProc give waveOutOpen function's location (so that it
> would know what to call))? I tryed this
>
> void CALLBACK WaveProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM
> lParam) {
> ... I left code for function the same
>
> but I get illegal operations
>
> Maybe I should make it thread-function (how?)?
>
> And what's the priority of this function (it's default or it is thread's
> priority)?
>
>
> Mike
>
>