Re: Directshow question - C / C++ / MFC Discussion Boards

Mark Salsbery26-Dec-06 15:04

26-Dec-06 15:04

Step 1) Generate new GUIDS. There's 3 of them in your project's pushguids.h.
You can use guidgen.exe (GUI) to create 1 at a time or uuidgen.exe to generate many sequential
GUIDs. Both utilities are in the platform SDK bin folder.

Step 2) modify those strings ("Filter name strings") in pushsource.h to your own names.
That will make your filter easier to find in graphedit.

Step 3) From a command prompt - "cd" to the folder your MemorySource.ax is in.
use "regsvr32 drive:\fullpath\MemorySource.ax" to register the com dll.

Step 4) Test in graphedit

-- modified at 21:10 Tuesday 26th December, 2006

Re: Directshow question

godspeed12326-Dec-06 15:37

godspeed123

26-Dec-06 15:37

Sweet its working!!!!!!!!!!!!!!!!

Last question hopefully

So if I have images being stored in memory, how do you pass that into this source filter since it has no input. All of these filters generate data internally, my data is sitting in memory all I want to do it pull that data into directshow.

Re: Directshow question [modified]

Mark Salsbery26-Dec-06 16:16

Mark Salsbery

26-Dec-06 16:16

godspeed123 wrote:
Sweet its working!!!!!!!!!!!!!!!!

Cool

godspeed123 wrote:
how do you pass that into this source filter since it has no input

The short answer: Any way you want!

A longer answer:
I would add a COM interface to the filter so you can add any methods you want to it and call them
just like you do the documented methods in Microsoft's DirectShow filters.
I'm no COM expert so if anyone wants to jump in and show how to do this better I'm all ears
(eyes?).

Example. There's 3 filters in your code. I'll use the CPushSourceBitmap class (PushSource
Bitmap Filter) as an example (I did it this way originally so I wouldn't mess up the original
class).

In pushsource.h define a COM interface class (you'll need another GUID for the interface)
Note that the GUID is defined here using standard IID_ naming convention and the same GUID, in
MIDL form, is used in the MIDL_INTERFACE macro.

DEFINE_GUID(IID_IMySource, 
0x0aaaaaaa, 0xaaaa, 0xaaaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa);
 
MIDL_INTERFACE("0aaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa")
IMySourceFilter : public IUnknown
{
public:
    // define pure virtual methods here
};

Next derive CPushSourceBitmap from the new interface class (IMySourceFilter)

//the old code
//class CPushSourceBitmap : public CSource
{

becomes

class CPushSourceBitmap : public CSource, public IMySourceFilter
{
public:
    // provide the overrides for IMySourceFilter virtual methods here
 
    // Expose IMySourceFilter
    STDMETHODIMP NonDelegatingQueryInterface(REFIID riid, void ** ppv);
    DECLARE_IUNKNOWN;

In pushsourcebitmap.cpp add the implementation for any new interface functions plus the
implementation of NonDelegatingQueryInterface() (note the use of the new GUID)

STDMETHODIMP CPushSourceBitmap::NonDelegatingQueryInterface( REFIID riid, void ** ppv) 
{
    CheckPointer(ppv,E_POINTER);

    if(riid == IID_IMySource)
    {                
        return GetInterface((IMySourceFilter *) this, ppv);
    }
    else
    {
        return CSource::NonDelegatingQueryInterface(riid, ppv);
    }
}

Use regsvr32 like before except with the /u switch to uninstall the previous filter.
Then use regsvr32 to register the filter again (with the new interface).

Now your filter has a custom COM interface so you can control it from the outside, just like
any other filters. Use QueryInterface as usual to get an interface pointer:

//pMyFilter is instance of filter obtained with CoCreateInstance()
IMySourceFilter *pifMySource = NULL;
pMyFilter->QueryInterface(IID_IMySource, (void **)&pifMySource);

Now you can add methods to send frames to the filter or whatever scheme you want to use - you
can also have the filter call a callback function to grab frames.

-- modified at 22:49 Tuesday 26th December, 2006

Re: Directshow question

Astricks26-Dec-06 17:13

Astricks

26-Dec-06 17:13

Very good responses from you. Smile | :)

My wishes for you Cool | :cool:

Re: Directshow question

godspeed12327-Dec-06 16:25

godspeed123

27-Dec-06 16:25

Thanks Mark for all the information, I will try it all out.

Once agian I am grateful for all the help you have given me.

Re: Directshow question [modified]

godspeed12327-Dec-06 16:45

godspeed123

27-Dec-06 16:45

Hi,

So I finished adding everything that you said and I could load the new filter in graphEdit. I kept the name the same as the sample, I am updating CPushSourceDesktop.

So now I want to be able to go into another C++ program and set this filter up.

Is the declaration to get it instantiated as follows:

CPushSourceDesktop *pMyFilter;

and then do this

hr = CoCreateInstance(CLSID_PushSourceDesktop, NULL, CLSCTX_INPROC_SERVER,
IID_IBaseFilter, reinterpret_cast<void**>(&pMyFilter));
hr = pGraph->AddFilter(pMyFilter, L"PushSource Desktop Filter");

IMySourceFilter *pifMySource = NULL;
pMyFilter->QueryInterface(IID_IMySource, reinterpret_cast<void**>(&pifMySource));

Its giving me linking errors :

error LNK2001: unresolved external symbol _IID_IMySource
error LNK2001: unresolved external symbol _CLSID_PushSourceDesktop

I included everything

#include "Dshow.h"
#include "Qedit.h"
#include "Streams.h"
#include "PushGuids.h"
#include "PushSource.h"

and the lib I included Strmiids.lib Quartz.lib MemorySource.lib

Any help would be appreiciated

Re: Directshow question

Mark Salsbery28-Dec-06 5:35

Mark Salsbery

28-Dec-06 5:35

The underscores preceding the symbols are suspicious Smile | :)

Did you include this file (above your GUID definitions)

#include <initguid.h>

and use the DEFINE_GUID macro to define them?

// {AAAAAAAA-AAAA-AAAA-AAAA-AAAAAAAAAAAA}
DEFINE_GUID(CLSID_PushSourceDesktop,
0xaaaaaaaa, 0xaaaa, 0xaaaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa);

Re: Directshow question

godspeed12328-Dec-06 14:13

godspeed123

28-Dec-06 14:13

Hi,

Thanks for the response. I added the #include <initguid.h> and it compiled, but when I run the program and I have written

hr = CoCreateInstance(CLSID_PushSourceDesktop, NULL, CLSCTX_INPROC_SERVER,
IID_IBaseFilter, reinterpret_cast<void**>(&pMyFilter));
hr = pGraph->AddFilter(pMyFilter, L"PushSource Desktop Filter");

The program crashes with an error Module MemorySource.ax, 2 objects left active!
At line 316 of dllentry.cpp

And then the program aborts.

Does anyone know why this is happening

Re: Directshow question

godspeed12328-Dec-06 16:12

godspeed123

28-Dec-06 16:12

I have added my test code here

http://www.ece.ubc.ca/~npatel/DShowTestApplication.zip[^]

And the source code which is just the source filter is below.

http://www.ece.ubc.ca/~npatel/MemorySource.zip[^]

Whenever I run this program it gets the error that I wrote above.

In the com class I have written a function hello that will output a messagebox, but it never gets to there.

Any help on what I am doing wrong is greatly appreciated

Re: Directshow question

Mark Salsbery30-Dec-06 12:09

Mark Salsbery

30-Dec-06 12:09

I can't figure out what's up.

If I substitute one of my known working filters then it works fine.
I tried to build a filter from scratch using your code and it fails (I'm not saying it's your
code - I mean just using your test hello() method).

If I see something or something comes to mind I'll let you know!

Confused | :confused:

Re: Directshow question

Mark Salsbery30-Dec-06 7:54

Mark Salsbery

30-Dec-06 7:54

Which line does the crash occur on? CoCreateInstance()?

I can't test your code since it has the PVxx.h header file that's missing.

Mark

Re: Directshow question

godspeed12330-Dec-06 9:58

godspeed123

30-Dec-06 9:58

Hi,

Thanks for the response.

The error occurrs on the AddFilter line, the PVxx.h you can delete, I am not using it in the filter.

I was just fooling around with things trying to get it to work.

Problem in saving Files and Folders

vijay_aroli26-Dec-06 5:52

vijay_aroli

26-Dec-06 5:52

hello everyone,

i am trying to save some files and folders onto a FTP server. i can successfully create the tree structure of the files and folders onto an FTP running Windows. but the operation fails when i try to save the same tree structure onto an FTP server running Linux on it.

may be the CFtpConnection:: CreateDirectory() function works only on the FTP servers running windows Operation System on it, is it??? i am not sure. can anyone please help me.

Thanks..

vijay.

Re: Problem in saving Files and Folders

Mark Salsbery26-Dec-06 7:00

Mark Salsbery

26-Dec-06 7:00

vijay7173 wrote:
FTP server running Linux on it

There's your problem right there Wink | ;)

Seriously, though, are you getting an error returned from CreateDirectory()?
Are you specifying a correct/appropriate path?

Re: Problem in saving Files and Folders

vijay_aroli26-Dec-06 8:26

vijay_aroli

26-Dec-06 8:26

Mark Salsbery wrote:
are you getting an error returned from CreateDirectory()?

yes sir.the CreateDirectory() returns 0. Frown | :(

more over it returns with an error code of 12003 OMG | :OMG:

and i am not able to make out what exactly the error is about.

Mark Salsbery wrote:
Are you specifying a correct/appropriate path?

yes, i am giving the correct path. the problem is that, i am sometimes successful in saving the tree to the FTP server with Linux running on it. but the Hierarchy is not preserved. i.e, the entire tree is saved at a same level. eg: a file with path, say, /root/folder1/folder2 the directory folder2 is created and saved under root folder, where as it should be saved in folder1(which is in turn saved under root). i have checked the path and i am sure that i am giving the right path. i even made sure to see that the path is not modified in between.

can i know what i should do to make my tree save to be saved onto the FTP server with Linux on it??? I am using the member functions of CFtpConnection class. should i use any alternatives(if there are any)?? Confused | :confused:

vijay.

Re: Problem in saving Files and Folders

Mark Salsbery26-Dec-06 8:43

Mark Salsbery

26-Dec-06 8:43

vijay7173 wrote:
more over it returns with an error code of 12003 and i am not able to make out what exactly the error is about.

INFO: WinInet Error Codes (12001 through 12156)[^]

12003 ERROR_INTERNET_EXTENDED_ERROR
An extended error was returned from the server. This is
typically a string or buffer containing a verbose error
message. Call InternetGetLastResponseInfo to retrieve the
error text.

What is the current directory (use CFtpConnection::GetCurrentDirectory()) before you try to create
a directory?

Re: Problem in saving Files and Folders

vijay_aroli26-Dec-06 9:11

vijay_aroli

26-Dec-06 9:11

Mark Salsbery wrote:
What is the current directory (use CFtpConnection::GetCurrentDirectory()) before you try to create
a directory?

well sir, the server connected me to the Root Directory (i.e, '/'). and every time i use CFtpConnection::SetCurrentDirectory() to set the directory when i am supposed change it.

vijay.

Re: Problem in saving Files and Folders

Mark Salsbery26-Dec-06 11:27

Mark Salsbery

26-Dec-06 11:27

Hmmm I don't know.

Can you post the code you use?

Have you tried InternetGetLastResponseInfo() to see if there's a meaningful error message?

Convert char array into CString

Johpoke26-Dec-06 5:08

Johpoke

26-Dec-06 5:08

I have a char array like the prevois one, ( char data[64] = "101...........)

but now i need to convert all of that char array into a normal mfc CString, without the char ender ofcourse.

How is this easily done?

ive played with strcpy, but couldnt get it to work,

thanks!!!!

/Johannes

Re: Convert char array into CString

Mark Salsbery26-Dec-06 5:36

Mark Salsbery

26-Dec-06 5:36

Johpoke wrote:
without the char ender ofcourse

If it's a non-Unicode build you can use

CString str = data;

For a unicode build you can use

TCHAR data[64] = "101...........";
CString str = data;

For a unicode build where the string must stay a char type you can use

char data[64] = "101...........";
CStringA str = data;

For a unicode build where the data must stay a char type but the CString is UNICODE you can use

char data[64] = "101...........";
CString str = CA2T(data);

Re: Convert char array into CString

Johpoke26-Dec-06 6:30

Johpoke

26-Dec-06 6:30

Thanks, its fixed,

and yet another problem, with my char array, i now need to set it, but it doesnt seem to work, ie.

char data[64];
data = "011111....";
[im feeding it the right amount of char

any ideas?

thanks

/Johannes

Re: Convert char array into CString

Mark Salsbery26-Dec-06 6:36

Mark Salsbery

26-Dec-06 6:36

Johpoke wrote:
im feeding it the right amount of char

Are you saying there's 64 characters in your initialization string? If so then that's bad Smile | :)

You need to have room for the NULL terminator. If you need 64 chars then define your data
variable to a length of 65.

Re: Convert char array into CString

Johpoke26-Dec-06 6:39

Johpoke

26-Dec-06 6:39

yea i know about the end part the /0 or if its a \0 but i use 63 of them, 64 with that, but i just need to be able to set all of it like

data = "10100010.....

its probably something simple im forgetting as usual-..

thanks

/Johannes

Re: Convert char array into CString

Mark Salsbery26-Dec-06 6:56

Mark Salsbery

26-Dec-06 6:56

Johpoke wrote:
its probably something simple im forgetting as usual-..

Instead of

char data[64];
data = "011111....";

try

char data[64] = "011111....";

or

char data[64];
strcpy(data, "011111....");

Re: Convert char array into CString

prasad_som26-Dec-06 18:25

prasad_som

26-Dec-06 18:25

Johpoke wrote:
char data[64];
data = "011111....";