C / C++ / MFC

load mp3 and seek by samples

11-Aug-09 23:10

some functins in the C Run-Time Library.
_mbsnBcmp
_mbsnbcmp
_mbsnbicmp
_mbsnextc,_strnextc,_wcsnextc

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javad_200511-Aug-09 20:08

javad_2005

11-Aug-09 20:08

hi i have one file of wave-Mpeg layer3 11025 16 channel 1.
mciSendstring can be load this mp3 and play it but doenst work correctly
when i get position by samples mcisendstring give me wrong. or give me wrong time .
i want to load mp3 and seek by samples and get position by samples.
do u have any way?
thanks.

zhu_lin11-Aug-09 23:12

11-Aug-09 23:12

hi,I used to player media file by using DirectShow SDK and work well.

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javad_200512-Aug-09 1:37

javad_2005

12-Aug-09 1:37

thanks .but can be directshow sdk seek by samples.

zhu_lin12-Aug-09 2:55

12-Aug-09 2:55

of course. I can give you an example about playe media file. also you can find some examples in the sdk which must be useful for you.

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zhu_lin12-Aug-09 3:13

12-Aug-09 3:13

this is a MFC application, you scroll the slider and seek the position of the media file using DisrectShow.

void CSimplePlayerDlg::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar) 
{
	if (pScrollBar->GetSafeHwnd() == mSliderGraph.GetSafeHwnd())
	{
		if (mFilterGraph)
		{
			// Calculate the current seeking position
			double duration = 1.;
			mFilterGraph->GetDuration(&duration);
			double pos = duration * mSliderGraph.GetPos() / 1000.;
			mFilterGraph->SetCurrentPosition(pos);
		}		
	}
	else
	{
		CDialog::OnHScroll(nSBCode, nPos, pScrollBar);
	}
}

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the way to use a DLL in Visual C++.

javad_200512-Aug-09 4:14

javad_2005

12-Aug-09 4:14

seek by samples not by ms
i means "time format samples"

thanks

lsh486love11-Aug-09 19:26

lsh486love

11-Aug-09 19:26

I want to use a dll in Visual C++ (Active X control), and for that i did the following:
ClassWizard->Add class->From a type library

Now i have the files that I need (.cpp and .h), but when I invoke a method, I get this message in my output:

"Warning: attempt to call Invoke with NULL m_lpDispatch!"

And the method does nothing. I think I have to create a LPDISPATCH object, but i don't know how. Any help???

My dll file name is "HanBarcord.dll".
and class name in the dll file is "Cbarcord".

I think I have to create the pointer to the real COM's IDispatch.
So, I'm trying to use the object's CreateDispatch function member.
But I don't know what I should put into parameter of "barcordreader.CreateDispatch" exactly.

COleException *e = new COleException;
Cbarcord barcordreader;
barcordreader.CreateDispatch(" ????????????? ", e);

Thank you in advance .

Re: the way to use a DLL in Visual C++.

CPallini11-Aug-09 20:59

CPallini

11-Aug-09 20:59

You should pass the CLSID or the ProgID of the automation object, see [^].

You may also get better help posting at the COM forum [^].
Smile | :)

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-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

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Re: the way to use a DLL in Visual C++.

Stuart Dootson11-Aug-09 21:40

Stuart Dootson

11-Aug-09 21:40

The CLSID, which should be recorded in the typelib somewhere.

I prefer using #import, which exposes the whole of a type-lib, including the CLSIDs.

Here's an example - I'm using Excel's _Application class (it's a COM class - you could use it via MFC's 'Add Class' route:

// Do the import - need to rename some things to avoid name collisions
#import "libid:00020813-0000-0000-C000-000000000046" version("1.6") auto_search no_dual_interfaces rename("DialogBox", "excelDialogBox") rename("RGB", "excelRGB") rename("DocumentProperties", "excelDocumentProperties") rename("SearchPath", "excelSearchPath") rename("CopyFile", "excelCopyFile") rename("ReplaceText", "excelReplaceText")

int main(int, char**)
{
   CoInitializeEx(0, COINIT_APARTMENTTHREADED);
   {
      // Create the Excel object (or get the active instance) - note
      // that the CLSID of the Excel application class is linked to
      // the structure (Excel::Application) generated for that class
      // and can be accessed using __uuidof.
      Excel::_ApplicationPtr xl;
      if (SUCCEEDED(xl.GetActiveObject(__uuidof(Excel::Application))))
      {
         std::cout << "Getting name\n";
         // We're using several auto-generated classes here (Excel
         // application, Excel workbook) - you'd have to import each
         // one separately with MFC!
         std::cout << xl->ActiveWorkbook->FullName << std::endl;
     }
   }
   CoUninitialize();
}

If you're using VC6 (which I'm guessing you are?), I'm not sure how well #import will work for you, though Frown | :-(

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

converting WCHAR[] to BYTE[]

RajeshRPR11-Aug-09 18:56

RajeshRPR

11-Aug-09 18:56

Hi,

I am trying to convert wchar[] content to byte[]... but to my surprise, all the suggested methods went in vain..
i used widechartomultibyte,wcstomobs .... they all reproduced "???" marks instead of characters, when i use Chinese or japanese content..

can anyone help me how to convert content without any loss??

Aim: my objective is to read byte by byte of wchar[] content and convert it to byte[]..

i'd be graterful to your reply.

Thanks,
Rajesh.

Sarath C11-Aug-09 20:24

Sarath C

11-Aug-09 20:24

You can allocate byte array and copy the data using memcpy. if you're using chinese or japanese characters it's hard to keep in single byte format. wchar_t is two byte so you may need to allocate 2* actual wchar elements to contain everything in the byte array. What is the purpose after converting to a byte array?

-Sarath.

My blog - Sharing My Thoughts

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Cedric Moonen11-Aug-09 20:34

Cedric Moonen

11-Aug-09 20:34

I suppose you are the same guy as Rakesh5 that posted this question yesterday ? (Why do you create multiple accounts ?)

RajeshRPR wrote:
they all reproduced "???" marks instead of characters,

David asked you yesterday where these characters are displayed. Are you inspecting the byte array with your debugger ? If yes, then it is normal that the characters are not displayed properly, because the debugger inspects an array of unsigned chars and not a string.

Cédric Moonen
Software developer

Charting control [v2.0]
OpenGL game tutorial in C++

RajeshRPR11-Aug-09 21:14

RajeshRPR

11-Aug-09 21:14

Hey Cedric,

I am his friend..We are working together.. i dont know he posted anything like that.. Hence, i posted today.

Have you replied him anything?

Thanks,
Rajesh