C / C++ / MFC Discussion Boards

Christian Graus12-May-04 12:17

12-May-04 12:17

What do you mean ? You pass the array into the function, but you pass it as a reference ( which means you put a & between the type and the variable name ). That means that any changes to the variable within the function also occur to the object outside the function, it's a bit like a pointer, except you have the object, not it's address.

Another point - you should use std::vector over CStringArray unless you have pressing reason to use crappy MFC containers.

Christian

I have drunk the cool-aid and found it wan and bitter. - Chris Maunder

Re: Incredible functions... may exist ?

Joe Woodbury12-May-04 12:47

Joe Woodbury

12-May-04 12:47

What Christian said except about std::vector. I like CStringArray. Works just fine and has less weirdness than vector.

Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke

Re: Incredible functions... may exist ?

Rafael Fernández López13-May-04 4:01

Rafael Fernández López

13-May-04 4:01

Yes it was said to pass a reference. I mean, to modify a public CStringArray object from a function.

That's a good idea !!

Thanx for everything !!

Written by: Rafael Fernández López.

Visit: http://www.maestroprogramador.com

C++ Constructor

act_x12-May-04 9:40

act_x

12-May-04 9:40

I am using MFC and have a class named
class CProfiles :: CPropertyPage
I currently have the default constructor , using which I create an Object of this class at Runtime such as :

<br />
CProfiles *ptr = new CProfiles();

Now i needed to modify this to pass a value that I need
CProfiles *ptr = new CProfiles(12);

I tried to make changes to my class

In the .h file

CProfiles();and in the .cpp file

CProfiles::CProfiles(int type=0) : CPropertyPage(CProfiles::IDD)<br />
{<br />
	//{{AFX_DATA_INIT(CProfiles)<br />
	//}}AFX_DATA_INIT<br />
	dataBuffer=0;<br />
	bufferSize=0;<br />
	loaded = false;	<br />
	// Initialize<br />
	Initialize();<br />
}

This isnt compiling . What am I doing wrong here ?

Re: C++ Constructor

toxcct12-May-04 9:53

toxcct

12-May-04 9:53

what error does the compiler return ?

another thing a see. you parameter type, you don't use it in you constructor ; i don't think it is what you wanted to do...

TOXCCT >>> GEII power

Re: C++ Constructor

act_x12-May-04 9:56

act_x

12-May-04 9:56

I get the following errors
error C2511: 'CProfiles::CProfiles' : overloaded member function 'void (int)' not found in 'CProfiles'

: see declaration of 'CProfiles'
fatal error C1004: unexpected end of file found

Secondly , the error isnt caused by me not using the variable type ! I am not using it as I am trying to get the Constructor to compile !

Engineering is the effort !

Re: C++ Constructor

act_x12-May-04 10:01

act_x

12-May-04 10:01

Needed to do this in the .h file
CProfiles(int type=0);

and in the .cpp file
CProfiles::CProfiles(int type) : CPropertyPage(CProfiles::IDD)
{
//{{AFX_DATA_INIT(CProfiles)
//}}AFX_DATA_INIT
dataBuffer=0;
bufferSize=0;
loaded = false;
profileType = type ;

// Initialize
Initialize();
}

This time I am using the variable "type" !!!! D'Oh! | :doh:

Re: C++ Constructor

toxcct12-May-04 10:05

toxcct

12-May-04 10:05

isn't there a void trailing few lines before you start the implementation of CProfiles::CProfiles(int); ?

do you also correctly include your header in the cpp ?

are you then sure that you inserted in the .h the synopis CProfiles(int); into the classe definition ?

to finish, i know that the type parameter is not at the origin of the error, i was just astonished to see you don't use it while you just said you overload the construct for that. but nevermind.

TOXCCT >>> GEII power

sound recording & playback

shoonya12-May-04 9:31

shoonya

12-May-04 9:31

does anybody have any code that helps in sound recording from microphone without using directshow/directsound and all those complex things?

also not write to a file but to keep the recorded sound data in memory.

Re: sound recording & playback

Anthony_Yio12-May-04 16:51

Anthony_Yio

12-May-04 16:51

from microphone without using directshow/directsound and all those complex things

DirectX is a layer provided by Microsoft to access hardware using a standard uniform API, without it, you will have to write each API for each of the hardware installed. Like, when you need to use Creative Sound Card, you will need separate API and so is other sound card. You will need a lot of version of your program to get it compatible.

Sonork 100.41263:Anthony_Yio

Life is about experiencing ...

Re: sound recording & playback

Marcus Spitzmiller12-May-04 17:58

Marcus Spitzmiller

12-May-04 17:58

Anthony - That's not entirely correct. Another option is to use the Windows MME API - for example the WaveIn* functions will do the trick too, and you won't really care about the hardware.

Shoonya - start with the WaveInOpen function and go from there. I don't really know what you are looking for, but this is a viable alternative to DirectX. You might find, though, that this is has different 'complex things', and DirectX might still be the way to go. The choice is yours.

Marcus Spitzmiller

"Why must life be so hard? Why must I fail at every attempt at masonry?" - Homer

Re: sound recording & playback

Joe Woodbury12-May-04 19:57

Joe Woodbury

12-May-04 19:57

Sorry, but decided to delete my previous posting. I don't want to deal with any questions. If you use email notification, you'll have a copy.

Here's an article that covers some of the same things (except, he apparently uses callbacks, which I don't normally recommend, but if it works....) http://www.codeproject.com/audio/wave_class_for_playing_and_recording.asp#xx648264xx[^]

Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke

Get the path of a file

Ruben93812-May-04 7:59

Ruben938

12-May-04 7:59

Hi and thanks in advance:

I am trying to create an application that first offers the user to open a file. I am using the function GETOPENFILE, then I my purpose is to check in the same folder, if there is another file (no user interaction there). For that, I was using the variable ofn (OPENFILENAME type) from the previous task, so it should have the information of the path and file name.

I tried, but had troubles to do that.

Here is a part of the code:

<br />
<br />
void CMainFrame::OnButton32794() <br />
{<br />
// TODO: Add your command handler code here<br />
<br />
//The user opens the firs file:<br />
OPENFILENAME ofn;<br />
memset(&ofn, 0, sizeof(ofn));<br />
ofn.lStructSize = sizeof(ofn);<br />
ofn.lpstrFilter = "Tec Files (*.tec)\0*.tec\0All Files (*.*)\0*.*\0\0";<br />
int nResult = ::GetOpenFileName(&ofn);<br />
<br />
//Now check for the second:<br />
CString str;<br />
LPCTSTR azcv;<br />
TCHAR szPath[MAX_PATH];<br />
LPCTSTR lpszFileName;<br />
LPTSTR lpszFilePart;    <br />
WCHAR wszTemp[MAX_PATH];<br />
<br />
lpszFileName = ofn.lpstrFile;<br />
<br />
//That should return the path the user selected..<br />
str = GetFullPathName(lpszFileName, <br />
                       sizeof(szPath) / sizeof(TCHAR), <br />
					   szPath, &lpszFilePart);<br />
<br />
//This is just a check I wanted to put in.<br />
MessageBox(str);<br />
}<br />
<br />

Re: Get the path of a file

David Crow12-May-04 8:11

David Crow

12-May-04 8:11

Why call GetFullPathName() at all? If you are interested in the filename that was selected, just reference ofn.lpstrFile.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: Get the path of a file

Ruben93812-May-04 8:45

Ruben938

12-May-04 8:45

ok, I just want to check if in the same folder, the one that the user select by selecting the file there is another specific file... without the interaction of the user. that's all.

Thaks, Ruben.

Re: Get the path of a file

David Crow12-May-04 8:49

David Crow

12-May-04 8:49

Use _splitpath() to split ofn.lpstrFile into its individual components. Then merge the components back together using " another specific file" instead of the file that was selected via GetOpenFileName().

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: Get the path of a file

Ruben93812-May-04 11:16

Ruben938

12-May-04 11:16

Thanks, could give and example on how to use this function?

Thanks, Ruben.

Re: Get the path of a file

David Crow13-May-04 2:09

David Crow

13-May-04 2:09

I presume you are referring to _splitpath(). If so, the MSDN docs have a good example.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: Get the path of a file

Ruben93812-May-04 11:16

Ruben938

12-May-04 11:16

How would you merge the other file with the path?

Thanks, Ruben.

Re: Get the path of a file

David Crow13-May-04 2:11

David Crow

13-May-04 2:11

Use a CString object and its concatenation operator. Smething like:

CString str = drive + dir + file_you_want_to_check;

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: Get the path of a file

Christopher Lloyd12-May-04 10:30

Christopher Lloyd

12-May-04 10:30

MS documentation states: "The GetFullPathName function retrieves the full path and file name of a specified file". So you still have the file name there.

I'd use PathRemoveFileSpec this "Removes the trailing file name and backslash from a path, if it has them."

Info on PathRemoveFileSpec:

Minimum DLL Version shlwapi.dll version 4.71 or later
Header shlwapi.h
Import library shlwapi.lib
Minimum operating systems Windows 2000, Windows NT 4.0 with Internet Explorer 4.0, Windows 98, Windows 95 with Internet Explorer 4.0

Re: Get the path of a file

Ruben93812-May-04 11:22

Ruben938

12-May-04 11:22

Thanks, I am able to use that function ..

I call it with the ofn.lpstrFile (path and file name).

Then I should have the ofn.lpstrFile ready to merge with the other file name ... how can I do this?

Thanks, Ruben.

Re: Get the path of a file

Christopher Lloyd13-May-04 2:00

Christopher Lloyd

13-May-04 2:00

If you've got the Windows SDK then you'll find details about the Shell Lightweight Utility Path Funtions in the documentation under:

User Interface Services > Windows Shell > Shell Reference > Shell Lightweight Utility Funtions > Path Functions.

(If you've not got the SDK then I recommend you get it. It's a free download from msdn)

There are lots of useful routines for manipulating paths. The one you need to merge the path with the name of the 2nd file is PathAppend.
Cheers, Chris

Re: Get the path of a file

Ruben93812-May-04 11:50

Ruben938

12-May-04 11:50

And it was already there!!!
Thanks to all for the suggestion.

http://www.codeproject.com/cpp/cfilespec.asp?df=100&forumid=30665&exp=0&select=699755

Hexadecimal

Roger H. Art12-May-04 7:34

Roger H. Art

12-May-04 7:34

Hi.

How could I convert an hecadecimal value that is in a CString variable to integer hexadecimal
for example I have:

CString strHexa="C9"

but I need this value in an integer variable:

int n=0xc9;

Thank you.

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