|
Your friend should team with an electronics engineering student - they are often required to make something useful as a Senior Project. Real time programs don't fit the Windows model very well, btw - you usually have to resort to a RTOS solution, and most of them support C, not C++. If this is intended to track voice signals, she'll need to sample the signals at an 8 kHz rate as a minimum in order to satisfy the Nyquist theorem, but modern A/D circuits do this easily. I wouldn't try for any higher rate, though, as aliasing will become a problem. I look forward to seeing future posts on this subject - it interests me, and probably more than a few of us on this site.
"Another day done - All targets met; all systems fully operational; all customers satisfied; all staff keen and well motivated; all pigs fed and ready to fly" - Jennie A.
|
|
|
|
|
Bravo !
Live as if your were to die tomorrow. Learn as if you were to live forever.
-Mahatma Gandhi
|
|
|
|
|
MailMonty wrote:
Bravo !
Are you a fellow engineer? We're rather rare here, you know...
"Another day done - All targets met; all systems fully operational; all customers satisfied; all staff keen and well motivated; all pigs fed and ready to fly" - Jennie A.
|
|
|
|
|
hello
how i can use or call a sheet of excel from VC??????
|
|
|
|
|
Create ODBC connection into Settings/Control Panel /... ODBC and open this connection like database with SQL statements as Select , Create and ... .
Create is used to make a sheet into Excel !
That's is my experience
|
|
|
|
|
i heared that it have an activex componement called "Microsoft Office Spreadsheet 10.0" who can for that , but i don't how i can use it .
are there someone who can help me ?
|
|
|
|
|
Hey all,
I'm currently making my own ListCtrl derived from CListCtrl. Today I added the feature of adding a checkbox to one of the list control's items. Everything turned out nicely except for one little detail. Since I'm making the check box the same size as the item it's currently being attached to the size of the checbox control is bigger than the check field itself (making room for e.g. text) and the default background color of the check box is gray and my list control is white:
http://www.blacksmith-studios.dk/list_example.jpg
Is there any way to set the background of the check box to white without having to do some custom drawing (and thereby also creating a whole new class)??
Thanks in advance,
Soren
|
|
|
|
|
I tried to import a sound file from the insert menu and got these entries automatically in the .rc file:
IDR_WAVE1 WAVE DISCARDABLE "DOOR.WAV"
#endif // English (U.S.) resources
Heres how I use it:
case WM_COMMAND:
{
switch(wparam)
case ID_SMENU_PLAY_DOOR:
{
PlaySound(MAKEINTRESOURCE (IDR_WAVE1),NULL,SND_FILENAME | SND_ASYNC);
} break;
default: break;
}
but the compiler says:
error C2065: 'IDR_WAVE1' : undeclared identifier
Puzzled.
Thanks,
ns
|
|
|
|
|
Hi ns,
Have you added the #define for the IDR_WAVE1 to your resource.h file, or at least checked that it is there.
regards,
Dark Angel
|
|
|
|
|
I feel sheepish now.... . No .h file was generated automatically (the sample I have does it all by hand and I am sort doing both - automatic and self generated). Anyways the h file I that I currently include in the script is not automatically made and it just didnt occur to me that I was responsible for #defines ............. . SO is it true that when you make a new rc script and add resources to it, you have to make the .h file with the #defines yourself? Thats what it seems like....
Thanks very much.........with your help it works great!
ns
|
|
|
|
|
Hello,
I am receiving arguments from a command line. Some of these values need to be in the form of ULONG data type.
When I extract the args I am assigning them to CString data type.
Is there a way to convert CString to ULONG???
Thank you.
|
|
|
|
|
use the _tcstoul() function to convert your string to the unsigned long data type.
I Dream of Absolute Zero
|
|
|
|
|
I had no idea this was possible. How do you convert the CString "Yeah baby! Let's go swimming!" to an unsigned long integer?
Is it just the memory address of the CString object that is assigned to ULONG?
If so, why not just use (ULONG)&String?
|
|
|
|
|
Terry O`Nolley wrote:
If so, why not just use (ULONG)&String?
As you may have guessed, I meant converting a string representation of a numeric value to ULONG.
I didn't see your sarcasm tag there Terry
I Dream of Absolute Zero
|
|
|
|
|
debutante wrote:
Is there a way to convert CString to ULONG???
see response to Terry's post above ^^^
I Dream of Absolute Zero
|
|
|
|
|
god,
that's not helping me much, can you point me to a sample of some kind or article ?
Stéphane
|
|
|
|
|
Hi,
I try to buid a client soft in C++.
The aim is to manage grid computing on database cleanning.
I want to run over the full database and to compare differents field with eatch other for each lines of the database (about 800 000 differents lines of about 30 or 40 fields each).
So the idea is to work like seti@home, a server part sending line by line to the clients and a the whole database given to the client and updated by this one every day with new lines.
Each time a client end the research for one id, it sent the result with http link to the server and get a new id to check out (maybee the big database update too).
My point is how to manage the huge database comparison, do I have to use XML (and then a XML file) ? or a huge ini file ? if xml which class should I use to do the comparison ?
Is my project totally crazy ?
Thanks for your help.
PS : for now I got the app starting and sending an icon in the taskbar (with the clock) and a menu where I can open a window or quit. Next is to set the priority level to low then to manage the data recuperation.
|
|
|
|
|
You will definitely use multithreading.
Kuphryn
|
|
|
|
|
sbouli wrote:
Is my project totally crazy ?
Yes (and as you appear by your subject line to be new to programming, it's downright insane), but it's also not explained very clearly, and you don't provide information on the environment you're working in, so it's hard for us to understand your requirements or help you solve the problem.
800,000 rows of 40 fields in a database isn't really all that big. If all you need to do is update or remove data based on particular criteria, why not just use SQL queries run from the appropriate database front end or client application?
If you need a copy of the database on each machine, why not look at SQL Server Replication?
--
Ian Darling
"The moral of the story is that with a contrived example, you can prove anything." - Joel Spolsky
|
|
|
|
|
hahahaha,
thanks ...
So the environment will be :
server : coldfusion no big deal here
clients : running in MS Visual C++ on différents windows computer (secretary ones and maybe commercials ones ;o).
The aim, NO USE of the MSSQL servers (4) running our main app, this grid trick is to work against multiple accounts from cheaters. They use real data and the only way for me to catch them is to find part of similarity between records. I already tried a coldfusion template running every 10 mn and checking one record at a time using the SQL server. Not really faisable, too long, not scalable, not changeable on the fly. With the grid computing way of working, I can have multiple clients working on differents id_members maybee with differents criteria. So it seems to me the best way to do it.
So, yes I am a beginner in C++, but I know quite well Coldfusion, not too bad MS SQL. And as a young little boy, I played with Turbo PASCAL and Assembler and C (no C++ at that time). So I hope being able to find part of code and some help on the web to manage something not too bad, what do you think ? should I stop now ?
Stéphane
|
|
|
|
|
Well, I'd look solving it differently. If you're looking for similar records (having data within given ranges or data belonging to a set of values), then I'd try and look for those using a SQL query first (in a program running on a separate machine to the SQL servers, and I would probably use ADO in VB6, or ADO.NET in VB.NET/C#, and stuff the results of a query into a RecordSet or DataSet as appropriate).
In the program, you can then scan through the smaller result set with more sophisticated algorithms to find the "cheaters".
And I think that trying grid computing is overkill for this application. Given good criteria in the SQL query to start with would surely reduce the nubmer of rows to check to a managable value.
I've regularly worked with million+ row databases, and done some *vaguely* similar stuff, and I've never needed to go beyond a straight single application.
I have to admit though, that the exact nature of your application eludes me. It sounds like you're doing a seti-style distributed application where you need to cross check the results, and the usual way to handle that is to distribute the same data to more than one client, and see if they match up. If they don't, you keep chucking it out until you get a consistent set of results, or you run that data through yourself.
(I also have to admit that I have no familiarity with programming CF, and I'm wondering exactly why you have it - it seems unsuited to this sort of application)
--
Ian Darling
"The moral of the story is that with a contrived example, you can prove anything." - Joel Spolsky
|
|
|
|
|
I got your point, let say I do a first selection using MSSQL or MYSQL, then I do a new check using others criteria on the new query. How would you handle this in C++ ? I mean, would you use specific data type for the query in C++ ? or specific way of working ?
I stick on C++ because I am playing around with it for a week now ....
Thanks for the time you spend reading my awfull english.
Stéphane
|
|
|
|
|
Well, to access a database using C++, I'd use the ADO libraries:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/ado270/htm/pg_ado_programming_6.asp[^]
Note that you need a working familiarity with COM (Component Object Model) to make progress with ADO.
ADO allows you to run an SQL Query (and you can specify your own criteria as part of that), and store the returned results in a Recordset object, that you can look through and examine easily. Each fields in each row of the recordset is stored as a Variant object (it's a union of lots of different types, with a tag to say what type you need to look at).
I hope that link gets you started. I would note that using ADO is a lot easier from Visual Basic 
There are also other libraries to access database from C++ - you can go lower level and use ODBC directly, or use the DAO library, which ADO superceded, but still seems reasonably popular to use from C++ programs.
--
Ian Darling
"The moral of the story is that with a contrived example, you can prove anything." - Joel Spolsky
|
|
|
|
|
Hi , i have a problem with documento of word, i open a my document with i have make 3 DOCVARIABLE, but with my application i can't to read name of this docvariable, if you have a examples for this problem
thank's
andfrr
|
|
|
|
|
hi,
i came across one of this indian language (kanada or canada i am not sure)software where when 'k' is typed their symbol for 'ka' is got and when 'u' is typed next to 'k' the symbol for 'ku' is got.
i tried to look into the font by selecting that font in wordpad and typed my name. I got junk!!! How does that software do what it does?The font is .ttf
i am very intrigued.
wolfgang schiffer
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
