C / C++ / MFC

arishri3-Dec-13 3:40

3-Dec-13 3:40

sorry abut that, I shorten it so the code will be clear....
The actual code has the tests:

if (WSAStartup(0x0101, &_wsaData) != 0)
    {
        fprintf(stderr, "Could not open Windows connection.\n");
        exit(0);
    }

char broadcast= (char)1;

    if (setsockopt(_socket, SOL_SOCKET, SO_BROADCAST, &broadcast ,sizeof(broadcast)) != 0)
    {
        fprintf(stderr, "Could not set socket options.\n");
        WSACleanup();
        exit(0);
    }

etc....

jeron13-Dec-13 4:01

3-Dec-13 4:01

arishri wrote:
_socket = socket(_nadressFam, SOCK_DGRAM, 0); //Gave it a try with (17) - UDP for the 3 rd parameter - not working

How could you tell it wasn't working? I assume IPPROTO_UDP equates to '17'. When your application is running, and you go to DOS prompt and do a "netstat -a" do you see your socket with the proper port listed?

arishri3-Dec-13 4:11

3-Dec-13 4:11

_socket = socket(_nadressFam, SOCK_DGRAM, 17);
    _socket1 = socket(_nadressFam, SOCK_DGRAM, 17);

    if ((_socket == INVALID_SOCKET) || (_socket1 == INVALID_SOCKET))
    {
        fprintf(stderr, "Could not create socket.\n");
        WSACleanup();
        exit(0);
    }

jeron13-Dec-13 4:21

3-Dec-13 4:21

Stick with one socket for now. If it still fails, call WSAGetLastError() and see what the error is.

arishri3-Dec-13 4:13

3-Dec-13 4:13

int nSize = recv(_socket, recvbuf,_nPacketSize + 1, 0);

Get no packages here....

jeron13-Dec-13 4:29

3-Dec-13 4:29

I couldn't be firewall related, could it?

[SOLVED] Capture CAM using Media Foundation

Member 104421753-Dec-13 21:25

Member 10442175

3-Dec-13 21:25

<pre Lang="turbo c">
#include<studio.m>
main()
{
char m;
int p;
float n;
scanf ("%s%d%f",&m,&p,&n);
} </pre>

pointer to pointer

messages2-Dec-13 7:13

messages

2-Dec-13 7:13

Hi everyone
The output of this code is 10,
I want to know why **q prints 10?
int x,*p,**q;
x=10;
p=&x
q=&p;
cout<<**q;

Re: pointer to pointer

Joe Woodbury2-Dec-13 8:56

Joe Woodbury

2-Dec-13 8:56

p points to x, which is assigned 10.
q points to p, which points to x.

*q returns p. Now you need to dereference that result to get to x. With parenthesis, you get: *(*q) == *p

Django_Untaken2-Dec-13 5:27

Django_Untaken

2-Dec-13 5:27

Hello sound and video gurus. I am trying to capture my integrated web cam using Media Foundation APIs. I could not figure out the following couple of points.

1 - Difference between RAW video and uncompressed video
2 - Video format for RAW video (like PCM for RAW audio, MFVideoFormat_Base perhaps?)

I am using the following code to capture and store data onto my hard disk (a lot of code is ommited for clarity). I am saving on 100 samples but it stores 267+ hours of data. Here it is

C++

BOOL CMyClass::StartRecording()
{
  HRESULT hResult;
  dwActualStreamIndex = 0;

  m_bFirstSample = TRUE;
  m_llBaseTime = 0, m_llTimeStamp = 0;
	
  IMFSample* pSample = NULL;
  IMFMediaBuffer* pMediaBuffer = NULL;
  BYTE* pData = NULL;

  BOOL bResult = InitCamera();  // this code is ommited. just assume it is correct
  if(!bResult) return FALSE;

  hResult = m_pReader->ReadSample((DWORD)MF_SOURCE_READER_FIRST_VIDEO_STREAM, 0, &dwActualStreamIndex, &dwStreamsFlags, &m_llTimeStamp, &pSample);
  if(FAILED(hResult)) return FALSE;

  hResult = m_pReader->ReadSample((DWORD)MF_SOURCE_READER_FIRST_VIDEO_STREAM, 0, &dwActualStreamIndex, &dwStreamsFlags, &m_llTimeStamp, &pSample);
  if(FAILED(hResult)) return FALSE;

  // 100 samples contain 267+ hours of data ? something wrong with this loop
  for (DWORD i = 0; i < 100; ++i)
  {
	hResult = m_pWriter->WriteSample(0, pSample);
	if(FAILED(hResult)) return FALSE;

	unsigned int c=0;
	hResult=pSample->GetBufferCount((DWORD*)&c);
	if(FAILED(hResult))MessageBox(NULL, "err","get buffer count", MB_OK);
 
	IMFMediaBuffer* buffer=NULL;
	hResult=pSample->GetBufferByIndex(0,&buffer);
	if(FAILED(hResult))MessageBox(NULL, "err","GetBufferByIndex", MB_OK);
 
	unsigned int sz=0;
	hResult=buffer->GetCurrentLength((DWORD*)&sz);
	if(FAILED(hResult))MessageBox(NULL, "err","GetCurrentLength", MB_OK);
 
	unsigned char* data=NULL;
	unsigned int validSize=0;
	hResult=buffer->Lock((BYTE**)&data,NULL,(DWORD*)&validSize);
	if(FAILED(hResult))MessageBox(NULL, "err","Lock", MB_OK);
 
	hResult=buffer->Unlock();
	if(FAILED(hResult))MessageBox(NULL, "err","Unlock", MB_OK);

	hResult = m_pReader->ReadSample((DWORD)MF_SOURCE_READER_FIRST_VIDEO_STREAM, 0, &dwActualStreamIndex, &dwStreamsFlags, &m_llTimeStamp, &pSample);
	if(FAILED(hResult)) return FALSE;
  }

	return TRUE;	
}

Thanks for any pointers.

modified 9-Dec-13 7:57am.

How to add the number to the shortcut in the desktop of the application.

yu-jian2-Dec-13 3:32

yu-jian

2-Dec-13 3:32

I find some application can show a number in the shutcut in the desktop , but I cannot find which windows api can do it. Is there anyone know it?

Re: How to add the number to the shortcut in the desktop of the application.

Richard MacCutchan2-Dec-13 5:14

Richard MacCutchan

2-Dec-13 5:14

What do you mean by "show a number in the shutcut in the desktop"?

Veni, vidi, abiit domum

Re: How to add the number to the shortcut in the desktop of the application.

jeron12-Dec-13 5:40

Re: How to add the number to the shortcut in the desktop of the application.

2-Dec-13 5:40

Do you mean something like "Microsoft Word (2)"?

yu-jian2-Dec-13 5:55

yu-jian

2-Dec-13 5:55

No, this is changed the shortcut name. I means that display a number in the icon of the shortcut.

Re: How to add the number to the shortcut in the desktop of the application.

jeron12-Dec-13 6:06

Re: How to add the number to the shortcut in the desktop of the application.

2-Dec-13 6:06

So overlay an image of a number on top of an existing icon?

yu-jian2-Dec-13 6:19

yu-jian

2-Dec-13 6:19

Yes, I donot know which windows api can do it.

Re: How to add the number to the shortcut in the desktop of the application.

jeron12-Dec-13 6:46

how to get ip address of a host

2-Dec-13 6:46

I'm far from certain but maybe IShellIconOverlay[^] may help. Also, perhaps even more so this article[^] might help shed some light.

Member 104386231-Dec-13 21:26

Member 10438623

1-Dec-13 21:26

The problem is that a host could have lots of network interfaces, and an interface could be bound to more than one IP address. And to top that, not all IP addresses will be reachable from off the machine. Some could be virtual devices, and others could be private network IP addresses.
How do i know my local ip address which is currently reachable from outside network?

Richard MacCutchan1-Dec-13 23:42

Richard MacCutchan

1-Dec-13 23:42

Is this something to do with C++?

Veni, vidi, abiit domum

Member 104386232-Dec-13 0:04

Member 10438623

2-Dec-13 0:04

Yes, i am looking for a C Program for this...

Richard MacCutchan2-Dec-13 0:30

Richard MacCutchan

2-Dec-13 0:30

Then you should be searching Google for samples. Please read http://www.codeproject.com/Messages/2922875/HOW-TO-ASK-A-QUESTION.aspx[^].

Veni, vidi, abiit domum

ahmad_ali2-Dec-13 22:54

ahmad_ali

2-Dec-13 22:54

Hi!

One of the few solutions that work relibaly are based on establishing a connection to some external website (e.g. google.com) and then checking the ip address of the local endpoint.

Example: http://stackoverflow.com/questions/2674314/get-local-ip-address-using-boost-asio[^]

Member 104386234-Dec-13 16:39

Member 10438623

4-Dec-13 16:39

Thanks Ahmad.

But I have one doubt in the above solution.

Suppose there are two ips configured in the system(one is through LAN and other one through USB) and we can connect external ip through one of the local ips(say through USB).

Then does this solution always returns the local ip which can connect outside(USB in this case) or it will return any one ip.

arishri3-Dec-13 3:48