Re: lookup plan for hashtable - C / C++ / MFC Discussion Boards

Re: Convert to DLL

KingsGambit20-Dec-10 19:08

KingsGambit

20-Dec-10 19:08

For creating a DLL you can check the following link: http://msdn.microsoft.com/en-us/library/ms235636(v=vs.80).aspx[^]

Re: Convert to DLL

Richard MacCutchan20-Dec-10 22:51

Richard MacCutchan

20-Dec-10 22:51

Teoh Chia Wei wrote:
is anyone manage to convert the function to DLL?

What function are you talking about, and why do want to convert it to a DLL?

Teoh Chia Wei wrote:
I have no clue how am I going to convert the whole thing to vb.net version.

Convert from what? And what does this have to do with C/C++?

Just say 'NO' to evaluated arguments for diadic functions! Ash

Re: Convert to DLL

Stephen Hewitt22-Dec-10 1:30

Stephen Hewitt

22-Dec-10 1:30

This is a strange question. DLLs export functions, so I guess you're asking how to make a DLL that exports the function? I suggest you read up on DLLs.

Steve

Re: Convert to DLL

Teoh Chia Wei22-Dec-10 15:50

Teoh Chia Wei

22-Dec-10 15:50

Sorry... this is my problem... I have no experience in C++ although I understand the logic in this feature... but I want to write it in VB.net. Instead of thinking how all the Windows libraries that work similarly like C++. I was thinking of compile this C++ project into DLL so that I can import the DLL in my VB.net. Unfortunately, it doesn't work that way.

Or, you guys as experts... got any idea what should I do with this? Thanks

Re: Convert to DLL

Teoh Chia Wei22-Dec-10 15:51

Teoh Chia Wei

22-Dec-10 15:51

sorry, I am refering to this How to Capture LPT Port(s) to Intercept DOS Print Requests[^]

lookup plan for hashtable [modified]

NarVish20-Dec-10 0:52

NarVish

20-Dec-10 0:52

Hi,
I faced few interview questions in C++. I'm new to C++. Please let me know the answers for the below questions.

* Whats the lookup plan for hash table and linkedlist
* Use of Red-Black Tree
* which datastructure is preferrable to store name, address and phone values
* How mutex works internally

Thanks in advance

modified on Monday, December 20, 2010 6:58 AM

Re: lookup plan for hashtable

Richard MacCutchan20-Dec-10 1:04

Richard MacCutchan

20-Dec-10 1:04

Rather than asking someone to give you answers to pass your interview, you would do better to buy a book on C++ and learn it before attempting such an interview.

Just say 'NO' to evaluated arguments for diadic functions! Ash

Re: lookup plan for hashtable

Alan Balkany20-Dec-10 5:16

Alan Balkany

20-Dec-10 5:16

Some brief answers...

1. Hash tables can look up items very quickly, at the cost of more space and a fixed size. This is their main advantage. A linked list is good for unknown amounts of data; it grows as you add more data. Lookup requires going though (on the average) half the list, so is generally slow.

2. A red-black tree uses one extra bit of storage per node to avoid the worst-case binary trees (skewed). (A scapegoat tree accomplishes this without the 1-bit overhead per node.)

3. A class.

4. All mutual-exclusion mechanisms ultimately depend on an atomic test-and-set operation, which determines if another thread is accessing a critical resource, and sets a flag at the same time if the resource is free. This must be done by hardware; if this capability isn't available, no pure-software solution will be able to provide mutual exclusion.

Re: lookup plan for hashtable

NarVish21-Dec-10 2:44

NarVish

21-Dec-10 2:44

Thanks alot Alan. Is a class of type datastructure?

Re: lookup plan for hashtable

David Crow21-Dec-10 2:54

David Crow

21-Dec-10 2:54

HaroldVish wrote:
Is a class of type datastructure?

It's more of a fancy struct. See here.

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"Man who follows car will be exhausted." - Confucius

Visual C++

John50219-Dec-10 22:22

John502

19-Dec-10 22:22

At What Conditions,
CStudioFile::ReadString() Gives/Returns the FALSE value?

I know that,What is available in the MSDN ,
AnyBody Know the another Conditions Please,
Tell me.

And
In a File Consists the Lines In one Condition "m_pString" doesn't take the line in the File?

Why it Happen? Any body know Please give me Reply....

Re: Visual C++

Maximilien20-Dec-10 0:38

Maximilien

20-Dec-10 0:38

What make you think there are other condition than what is describe in the documentation ? Do you have a test case that will trigger a FALSE ?

It returns FALSE (or NULL depending on which version you call) if no data is read before the end-of-file.

John502 wrote:
In a File Consists the Lines In one Condition "m_pString" doesn't take the line in the File?

What does that mean : Confused | :confused:

Watched code never compiles.

Re: Visual C++

John50220-Dec-10 1:51

John502

20-Dec-10 1:51

Hello Maxi,
Thanks for helping in this regards; I want to run my test case on the below text;

12/13/10 10:11:00 (India Standard Time), [3484] TAPIAdapter.cpp :379 INFO - Closing the database before stopping the service.
12/13/10 10:11:00 (India Standard Time), [3484] TAPIAdapter.cpp :409 INFO - TAPIAdapterDynConfig thread could not be stopped
12/13/10 10:11:00 (India Standard Time), [3484] TAPIAdapter.cpp :429 INFO - "TAPIAdapter Service" Service Stopped
12/13/10 10:11:04 (India Standard Time), [3544] TSPConnector.cpp :166 TRACE - Line is closed for device_id 110
12/13/10 10:11:04 (India Standard Time), [3544] TSPConnector.cpp :166 TRACE - Line is closed for device_id 110
3_VOIP_10202010_00004 made on Oct 20 2010 16:41:29
12/13/10 10:11:00 (India Standard Time), [1508] TAPIAdapter.cpp :793 ERROR - Illegal keyword "CheckExtInCTIUserInterval" in configuration file
12/13/10 10:11:04 (India Standard Time), [1508] CVoipDatabase.cpp :167 INFO - KnoahSoftDB : Connection opened with database at ip address : 157.0.60.155
12/13/10 10:11:04 (India Standard Time), [4108] CCTIOSAdapterKSDB.c :142 TRACE - The SQL Query is :- select v.voip_phone_extension Voip_Phone_Extension,e.emp_code Emp_Code,e.emp_id Emp_ID,e.network_id Network_ID,s.site_alias Site_Alias From Employee E, Site S, Voice_Configuration V, Employee_Detail D Where V.Emp_Id = E.Emp_Id And V.Emp_Id = D.Emp_Id And D.Location_ID = S.Site_ID And V.Status = 'A' And V.Do_Voice_Recording = 'Y' And V.Voip_phone_extension != '-1' and v.emp_id not in (select e.emp_id from employee e where e.emp_first_name like 'extn_agent_%') order by voip_phone_extension

I have this text content in one file and wants to read this by application;

please help me out..

Thanks
John;

Re: Visual C++

Maximilien20-Dec-10 3:15

Maximilien

20-Dec-10 3:15

So what is the issue ?

You open the file, read the file line by line with CStdIO::ReadString and do what ever you want with each string :

something like :

CStdioFile myFile(_T("C:\\path\\to\\your\\file.txt"), CFile::modeRead |CFile::typeText  );

CString myString;
while (myFile.ReadString( myString ) )
{
    // do something with my string.
    std::wcout << myString.GetBuffer() << std::endl;

}

Watched code never compiles.

Re: Visual C++

Michael Schubert20-Dec-10 3:26

Michael Schubert

20-Dec-10 3:26

Pretty much the same reply he got from me a few days ago. D'Oh! | :doh:

http://www.codeproject.com/Messages/3701943/Visual-Cplusplus.aspx[^]

Go and never darken my towels again - Groucho Marx

Re: Visual C++

Maximilien20-Dec-10 3:33

Maximilien

20-Dec-10 3:33

Watched code never compiles.

how to compare two audio files

rajniyadav1a19-Dec-10 22:11

rajniyadav1a

19-Dec-10 22:11

Re: how to compare two audio files

Maximilien20-Dec-10 0:41

Maximilien

20-Dec-10 0:41

Compare what ? the file or the audio ?

With a lot of difficulties.

Good luck.

Watched code never compiles.

Re: how to compare two audio files

rajniyadav1a20-Dec-10 1:16

rajniyadav1a

20-Dec-10 1:16

i want to compare audio.

Re: how to compare two audio files

Maximilien20-Dec-10 1:34

Maximilien

20-Dec-10 1:34

With a lot of work and with the help of a Fast Fourier Transformation. (google for that)

And then there is the issue of file formats and sampling rates and all that junk.

Good luck.

Watched code never compiles.

Re: how to compare two audio files

Cedric Moonen20-Dec-10 20:49

Cedric Moonen

20-Dec-10 20:49

What do you mean by "compare" exactly ? Your question is totally vague, please clarify. And please describe your question in the body of the message, not in the header.

Cédric Moonen
Software developer

Charting control [v3.0]
OpenGL game tutorial in C++

Re: how to compare two audio files

rajniyadav1a20-Dec-10 22:07

rajniyadav1a

20-Dec-10 22:07

I have a large audio file (MP3 and wma). Now I want to find some particular Track (speech) in that audio large files. So How can I compare two Audio files Samples .

Device Context

002comp19-Dec-10 18:42

002comp

19-Dec-10 18:42

hello Friends

In my application there are too many windows and I want to know the device context(Handle) on which i want to draw mine image.How do I get that device context?
Any Ideas?

Regards
Yogesh

Re: Device Context

Richard MacCutchan19-Dec-10 21:23

Richard MacCutchan

19-Dec-10 21:23

See here[^].

Just say 'NO' to evaluated arguments for diadic functions! Ash

Re: Device Context

002comp19-Dec-10 21:48

002comp

19-Dec-10 21:48

THanks For Reply.
I am not able to use GetDc bcoz my application is multiDoc And am not having handle to the Window as there are too many.And GetDC parameter is Handle to that Window.

I tried FindWindow also to retrieve the handle of Display window but FindWindow returning null.
I am Using VC6.0

Any other Ideas.
Regards
Yogesh

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