Problems with sending UPD Packets over sendto - C / C++ / MFC Discussion Boards

Jon Hulatt12-Jan-09 1:22

12-Jan-09 1:22

I have a legacy C app which uses FFmpeg APIs.

I'm trying to update it, I want to write a UI in C# and keep the core in C.

So, i'm dabbling in C++/CLI for the first time.

It's my understanding that I can create a managed class wrapper, and have managed methods which take managed parameters, convert them as necessary to unmanaged equivalents (with System.Runtime.InteropServices.Marshal methods), do the work in native C, and then convert outputs from unmanaged to managed types for return.

However, I'm stuck at the start. I've created a class like this:-

ref class FFmpegCap
{
public:
	FFmpegCap(String^ inputVideo);

protected:
	AVFormatContext *m_pFormatContext;
					
};

In my constructor, i need to call a C FFmpeg function to initialise the library, one of the parameters it requires is of type AVFormatContext ** . So, I call this function as follows:-

    if (av_open_input_file(&m_pFormatContext, pInputVideo ,NULL,0,NULL) != 0)
{

}

However, this fails to compile; error C2664: 'av_open_input_file' : cannot convert parameter 1 from 'cli::interior_ptr<type>' to 'AVFormatContext **'

It seems that the & operator is not doing what I expect of it!

Any pointers?

Thanks

Jon

using System.Beer;

Re: Mixing managed/unmanaged in C++/CLI

Iain Clarke, Warrior Programmer12-Jan-09 1:32

Iain Clarke, Warrior Programmer

12-Jan-09 1:32

There is a C++/CLI forum where you may get faster answers.

Then again, one of the other people here may be typing an answer at the same time as me...

Good luck,

Iain

Codeproject MVP for C++, I can't believe it's for my lounge posts...

Re: Mixing managed/unmanaged in C++/CLI

Jon Hulatt12-Jan-09 1:37

Jon Hulatt

12-Jan-09 1:37

Thanks Iain, I should use my eyes more I think.

using System.Beer;

Dialog box LAYOUTRTL issue [modified]

Alex@9C12-Jan-09 1:13

Alex@9C

12-Jan-09 1:13

I am using CProperySheet and CPropertyPage in my application for creating tabbed dialog boxes.
For providing the RTL layout, I am using the WS_EX_LAYOUTRTL for Property Sheet and Property Pages both.
This is doing well.
The Titla bar ( System control and min/max/restore buttons) are now in RTL layout.

Tabs contents are also in RTL layout. However two issues are still remaining opened-

1. OK and CANCEL buttons (that were in the Right Side of the screen before applying WS_EX_LAYOUTRTL style) are now in the Middle of the screen. They should be in the Left of the screen.
(Point to notice is that i have hide the "Help" and "Apply" buttons.)

2. Tabs (Tab Bar) are still coming in the Left side of the screen. No effect of the RTL layout on the tabs (Tab Bar) alignment or in their order.

<br />
void CAllControlsSheet::AddControlPages()<br />
{<br />
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);<br />
	m_psh.dwFlags |= PSP_USEHICON;<br />
	m_psh.hIcon = m_hIcon;<br />
	m_psh.dwFlags |= PSH_NOAPPLYNOW; // Lose the Apply Now button<br />
	m_psh.dwFlags |= PSH_RTLREADING ; <br />
	m_psh.dwFlags &= ~PSH_HASHELP;   // Lose the Help button<br />
	<br />
	Invalidate();<br />
<br />
	AddPage(&m_treectrlpage);<br />
	AddPage(&m_animctrlpage);<br />
	AddPage(&m_toolbarpage);<br />
	AddPage(&m_datetimepage);<br />
	AddPage(&m_monthcalpage);<br />
<br />
}<br />
<br />
BEGIN_MESSAGE_MAP(CAllControlsSheet, CPropertySheet)<br />
	//{{AFX_MSG_MAP(CAllControlsSheet)<br />
	ON_WM_QUERYDRAGICON()<br />
	ON_WM_SYSCOMMAND()<br />
	//}}AFX_MSG_MAP<br />
END_MESSAGE_MAP()<br />
<br />
/////////////////////////////////////////////////////////////////////////////<br />
// CAllControlsSheet message handlers<br />
<br />
BOOL CAllControlsSheet::OnInitDialog()<br />
{<br />
	// Add "About..." menu item to system menu.<br />
<br />
	// IDM_ABOUTBOX must be in the system command range.<br />
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);<br />
	ASSERT(IDM_ABOUTBOX < 0xF000);<br />
<br />
	CMenu* pSysMenu = GetSystemMenu(FALSE);<br />
	if (pSysMenu != NULL)<br />
	{<br />
		CString strAboutMenu;<br />
		strAboutMenu.LoadString(IDS_ABOUTBOX);<br />
		if (!strAboutMenu.IsEmpty())<br />
		{<br />
			pSysMenu->AppendMenu(MF_SEPARATOR);<br />
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);<br />
		}<br />
	}<br />
<br />
	SetIcon(m_hIcon, TRUE);<br />
	SetIcon(m_hIcon, FALSE);<br />
	ModifyStyleEx(0, WS_EX_LAYOUTRTL); <br />
	return CPropertySheet::OnInitDialog();<br />
}<br />
<br />

modified on Monday, January 12, 2009 9:45 AM

German ANSI/Unicode umlauts in source code [SOLVED]

sashoalm12-Jan-09 0:59

sashoalm

12-Jan-09 0:59

I have a word containing umlauts that I need to put on a toolbar button in Word. The project is an ATL/COM addin for MS Word (ANSI build).

The umlauts come out as Cyrillic letters even though our test machine is running a German-localized version of Windows.

This code for example produces correct text in the message box and a Cyrillic letter instead of an umlaut in the Word toolbar:

spButton->PutCaption(L"Öffnen");
::MessageBox(0, "Öffnen", 0, 0);

PutCaption accepts _bstr_t variable as argument, and wants unicode input. And I think that there are two types of umlauts - an ANSI variant which works only if the code page is set to german, and a 16-bit unicode variant, but I'm not sure about that.

And since the cpp file is encoded as ANSI it might be that Word gets an ANSI umlaut when it wants a unicode umlaut.

Is that so or not? And how do I fix the problem in either case?
Thanks.

There is sufficient light for those who desire to see, and there is sufficient darkness for those of a contrary disposition.
Blaise Pascal

modified on Monday, January 12, 2009 10:08 AM

Re: German ANSI/Unicode umlauts in source code

Iain Clarke, Warrior Programmer12-Jan-09 1:31

Iain Clarke, Warrior Programmer

12-Jan-09 1:31

I don't know if you're right or not - but it sounds plausible.

What you could do is to put the text in a string table, and use LoadString.

This is good practise anyway - it means you can have different language resources, etc. Hard coded strings in your source is a Bad Idea (tm).

Iain.

Codeproject MVP for C++, I can't believe it's for my lounge posts...

Re: German ANSI/Unicode umlauts in source code

sashoalm12-Jan-09 4:08

sashoalm

12-Jan-09 4:08

Hi,

I fixed the problem, and it seems I was right about the Unicode/ANSI umlauts. This code for example didn't produce a MessageBox:

std::wstring unicode = (wchar_t) 0xD6; // this is unicode Ö
unicode += L"ffnen";

if (unicode == L"Öffnen")
	::MessageBox(0, 0, 0, 0);

There is sufficient light for those who desire to see, and there is sufficient darkness for those of a contrary disposition.
Blaise Pascal

Problems with sending UPD Packets over sendto

CrazyDogg11-Jan-09 23:59

CrazyDogg

11-Jan-09 23:59

Hi @ all,

under XP I have the problem sending UDP Packets over the sendto command.

Sporadically my client didn´t send the packets.

The first time it works fine. I build the packet and then send it with the sendto command. On the second time or more the packet will be created and runs the send command correct. The Remote Port and Address are correct too.

But if I protocol these actions with packetyzer or wireshark the sent packet is not displayed anywhere.

Anyone here who knows what it could be that the packet will not send?

Regards,

Karsten

Re: Problems with sending UPD Packets over sendto

Rajkumar R12-Jan-09 0:08

Rajkumar R

12-Jan-09 0:08

Check the return value of sendto API

Re: Problems with sending UPD Packets over sendto

CrazyDogg12-Jan-09 0:17

CrazyDogg

12-Jan-09 0:17

the return Value is above Zero and the size of command.

Re: Problems with sending UPD Packets over sendto

Stuart Dootson12-Jan-09 0:11

Stuart Dootson

12-Jan-09 0:11

UDP will drop packets if you send them too fast - here's a Microsoft article that says as much[^].

Fundamentally, UDP makes no delivery guarantees, so if that's important to you, you either want to think about using TCP (that'd be my choice) or implementing some form of handshaking.

I would recommend downloading the IBM TCP/IP Redbook[^] - it's a very useful networking resource.

Re: Problems with sending UPD Packets over sendto

CrazyDogg12-Jan-09 0:18

CrazyDogg

12-Jan-09 0:18

But under Vista it works correctly.
And I send SIP Packets above the UDP Socket.
I can´t use TCP because it´s a realtime ip phone I programm.

Re: Problems with sending UPD Packets over sendto

David Crow12-Jan-09 3:11

David Crow

12-Jan-09 3:11

CrazyDogg wrote:
But under Vista it works correctly.

Which means it's likely a coincidence.

CrazyDogg wrote:
I can´t use TCP because it´s a realtime ip phone I programm.

Then it'll be up to you to code the handshaking.

"Love people and use things, not love things and use people." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

Re: Problems with sending UPD Packets over sendto

CrazyDogg12-Jan-09 3:41

CrazyDogg

12-Jan-09 3:41

How to code a handshaking for this?
I have never done this.

Re: Problems with sending UPD Packets over sendto

David Crow12-Jan-09 3:45

David Crow

12-Jan-09 3:45

CrazyDogg wrote:
How to code a handshaking for this?

However you want to. It's just extra information (usually a CRC) that the send adds to the packet at a specific location (e.g., front, back). The receiver looks at that spot to know if all of the packet has been received. If so, an ACK of some sort is sent back.

"Love people and use things, not love things and use people." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

Re: Problems with sending UPD Packets over sendto

CrazyDogg12-Jan-09 3:48

CrazyDogg

12-Jan-09 3:48

I think it is impossible to made a handshake for this because I just code the client.
The server is an asterisk server and I have no rights to change anything.

Why does ConnectEx need a bound socket?

followait11-Jan-09 23:32

followait

11-Jan-09 23:32

In the book, it says:

the socket passed into ConnectEx needs to be previously bound with a call to bind.

Why does a client socket need binding?

Re: Why does ConnectEx need a bound socket?

Stuart Dootson12-Jan-09 0:01

Stuart Dootson

12-Jan-09 0:01

Ummm - because that's the way the API works?

A socket is a communications endpoint - it needs an address (IP address and port number) before it can be used. For a client, the address is 'localhost' (or 127.0.0.1), whilte the port .

The Microsoft samples I've seen use the connect function rather than ConnectEx. connect doesn't require a bound socket - a bind (I would imagine) to an arbitrary port on localhost occurs within connect. ConnectEx gives a significant amount of flexibility in comparison - and (part of) the price for that would appear to be that you have to do the socket binding yourself.

Save an image using CImage class

VC++Maniac11-Jan-09 23:02

VC++Maniac

11-Jan-09 23:02

Im unable to save a image using CImage. Im able to load and draw it. At a later stage, I need to save it to a different path, so I call Save(). It gives an error '80004005' "Unspecified error".

Please suggest..
TIA

Re: Save an image using CImage class

CPallini11-Jan-09 23:43

CPallini

11-Jan-09 23:43

The debugger is your best friend.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- 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

[My articles]

Re: Save an image using CImage class

VC++Maniac12-Jan-09 0:10

VC++Maniac

12-Jan-09 0:10

Just now I tried the microsoft's sample. It also gives the same error.. I have nothing to debug. The HRESULT from save is E_FAIL. thats it. the file name is valid. I also tried giving it a simple path name such as "D:\\myImg", but the same error occurs.

TIA

Re: Save an image using CImage class

Code-o-mat12-Jan-09 0:47

Code-o-mat

12-Jan-09 0:47