Multiple access to MS SQL Database - C / C++ / MFC Discussion Boards

kcynic23-Sep-07 23:06

23-Sep-07 23:06

I want to use DirectShow's interface IMediaDet to retrieve codec info from media files.
I only want to check the audio codec is AAC and video codec is MPEG-4.
How to resolve such task?
Thanks.

GOOD LUCK

Re: DirectShow about media files

Mark Salsbery24-Sep-07 7:30

Mark Salsbery

24-Sep-07 7:30

Does the step-by-step info in the DirectShow SDK help?

IMediaDet Interface[^]

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: DirectShow about media files

kcynic24-Sep-07 15:21

kcynic

24-Sep-07 15:21

But,I am sorry,I have read such document in SDK.
Now,I can read much infomation from the file,such as,media streams,duration,and so on.
In advanture,I also want to check its media codec,I want to check the audio is AAC and the video is MPEG-4.

Happy Mid-auturmn Day.

c++ UserInterface

raja.geek23-Sep-07 23:04

raja.geek

23-Sep-07 23:04

Hai all,
I am very glad to join to this site....
I am new to User interface development....
I would like to know some information regarding c++ UI
If any one know this,please help me?
Thanks and regards,
Rajasekharreddy.B

raja

Re: c++ UserInterface

David Crow24-Sep-07 3:08

David Crow

24-Sep-07 3:08

raja.geek wrote:
I would like to know some information regarding c++ UI
If any one know this,please help me?

Such as?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: c++ UserInterface

toxcct24-Sep-07 20:51

toxcct

24-Sep-07 20:51

this is too vague.
you must ask specific question is you want people to help you.
if you want to start programming user interfaces, then start by learning with a book, try the sammples...
and if some don't work like you expected, then ask here...

[VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines]

Re: c++ UserInterface

Signal-926-Sep-07 15:16

Signal-9

26-Sep-07 15:16

I suggest going to check out these three frameworks.

1) WPF (using C++/CLI)
2) MFC (using native C++)
3) Trolltech QT (using native C++)

Once you know what they are and a basic principle of how they work, you can start programming rich UI's for your wonderful C++ programs. Laugh | :laugh:

Multiple access to MS SQL Database

__yash__23-Sep-07 22:57

__yash__

23-Sep-07 22:57

hi,
I have six functions in my MFC application which internally call the function AddNew() to add a new row in the database. And then Update() and Requery() after finishing with one row.
Could this cause a problem when more than one function calls AddNew() at the same time? Same with Update() and Requery()?

function1()<br />
{<br />
//Add a new row into the database<br />
ptr->AddNew();<br />
//Then insert values into the specific columns<br />
//Then...<br />
ptr->Update();<br />
ptr->Requery();<br />
}

What issues could arise because of this kind of a structure??

Re: Multiple access to MS SQL Database

Mark Salsbery24-Sep-07 7:33

Mark Salsbery

24-Sep-07 7:33

How is it possible for two or more of your functions to be called at the same time?

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Multiple access to MS SQL Database

__yash__24-Sep-07 20:35

__yash__

24-Sep-07 20:35

Actually im using six Socket Class. So each one has its own OnReceive() function which in turn call their respective 'parsing function' (So there are 6 parsing functions). Each of these parsing functions calls its own 'AddNew()' method (total of 6 AddNew() calls)to add a row in the database.

Re: Multiple access to MS SQL Database

Mark Salsbery25-Sep-07 5:40

Mark Salsbery

25-Sep-07 5:40

That's fine. As long as there's only one thread, there's no concurrency
issues. If your 6 sockets are all creaed on the same thread then all the
OnReceive() calls occur on one thread (I'm assuming you're using CSocket
or CAsyncSocket).

If the sockets were all on separate threads, and all shared the same "ptr"
variable, then you'd have problems.

If the sockets were all on separate threads, and all had separate connections to the
DB, then the concurrency rules for the DB would apply.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Multiple access to MS SQL Database

__yash__25-Sep-07 18:53

__yash__

25-Sep-07 18:53

yes, i m using CAsyncSocket class and its all in one thread, however, i m thinking of putting my 'parsing functions' for six OnReceive()s in six seperate threads. I hope thats fine.OnReceive1(),OnReceive2(),...OnReceive6() would all be in the same thread.
As for connecting to the database i m using GetDefaultConnect() and GetDefaultSQL() methods(Created by default in the project for MFC Application using Database)

How to run an exe file.

Exelioindia23-Sep-07 22:52

Exelioindia

23-Sep-07 22:52

Hi all,

Please some one help, how to run an exe file at runtime using VC++.NET. I am new to this environment. In c# using system.diago.......... it's possible to execute an exe file at runtime. But i dnt knw in VC++. Plz help me.

Thanks in advance

Know is Drop, Unknown is Ocean

Re: How to run an exe file.

_AnsHUMAN_ 23-Sep-07 22:55

_AnsHUMAN_

23-Sep-07 22:55

ShellExecute(/*parameters*/);

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: How to run an exe file. [modified]

Exelioindia23-Sep-07 23:44

Exelioindia

23-Sep-07 23:44

Thanks for your help. Plz give me some sample code to understand

I tried the below code:

MessageBox(NULL, "Before!", "Invalid Key", MB_OK | MB_ICONINFORMATION);
HINSTANCE hInst = ShellExecute(NULL,"Open","C:\\Winnt\\Notepad.exe","C:\\xxx.txt","",SW_MAXIMIZE);
MessageBox(NULL, "After!", "Invalid Key", MB_OK | MB_ICONINFORMATION);

For me the both Message boxes are displayed, but not the exe was not opening.

Plz help me

-- modified at 6:03 Monday 24th September, 2007

Know is Drop, Unknown is Ocean

Re: How to run an exe file.

nbugalia23-Sep-07 22:56

nbugalia

23-Sep-07 22:56

Use ShellExecute.

Re: How to run an exe file.

Exelioindia23-Sep-07 23:44

Exelioindia

23-Sep-07 23:44

Thanks for your help. Plz give me some sample code to understand

Know is Drop, Unknown is Ocean

Re: How to run an exe file.

nbugalia24-Sep-07 0:03

nbugalia

24-Sep-07 0:03

Search Visual C++ / MFC forum with keyword ShellExecute and you will get plenty of examples Smile | :)

Re: How to run an exe file.

Exelioindia24-Sep-07 0:05

Exelioindia

24-Sep-07 0:05

Thanks for your help.

I tried the below code:

MessageBox(NULL, "Before!", "Invalid Key", MB_OK | MB_ICONINFORMATION);
HINSTANCE hInst = ShellExecute(NULL,"Open","C:\\Winnt\\Notepad.exe","C:\\xxx.txt","",SW_MAXIMIZE);
MessageBox(NULL, "After!", "Invalid Key", MB_OK | MB_ICONINFORMATION);

For me the both Message boxes are displayed, but not the exe was not opening.

Plz help me

Know is Drop, Unknown is Ocean

Re: How to run an exe file.

nbugalia24-Sep-07 0:10

nbugalia

24-Sep-07 0:10

ShellExecute(NULL,"Open","C:\\Winnt\\Notepad.exe","C:\\xxx.txt",NULL,SW_MAXIMIZE);

Re: How to run an exe file. [modified]

Exelioindia24-Sep-07 0:22

Exelioindia

24-Sep-07 0:22

Thousands of thanks for your kind help, finally me suggest me how to pass an string as argument to that exe.

Thanks for your suggetions

-- modified at 6:32 Monday 24th September, 2007

Know is Drop, Unknown is Ocean

Re: How to run an exe file.

David Crow24-Sep-07 3:14

David Crow

24-Sep-07 3:14

Exelioindia wrote:
...suggest me how to pass an string as argument to that exe.

That's what the fourth argument (e.g., c:\xxx.txt) is for.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: How to run an exe file.

David Crow24-Sep-07 3:13

David Crow

24-Sep-07 3:13

You can also use CreateProcess().

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

try-catch handling

Mary Chennai23-Sep-07 22:41

Mary Chennai

23-Sep-07 22:41

I have a try-catch block as follows

try
{
A();
}
catch(...)
{
}

When i was working with Visual C++ 6.0, any null pointer accessed within function A was caught by the above catch. But now after VS2005 conversion, the same catch doesn't handles null pointer access, and the program crashes.
Please suggest on the Project Setting to be changed for this to work.

Re: try-catch handling

Russell^'23-Sep-07 23:08

Russell^'

23-Sep-07 23:08

Usually YOU have to check if the pointer is valid:

if(p!=NULL){
  ...
  p->...
  ...
}

in this case you also can:

try{
 if(p==NULL) AfxThrowMemoryException();
 ....
 p->...
 ...
}catch(...){
}

hope helps Smile | :)

Russell

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.