C / C++ / MFC Discussion Boards

final proect for C++ suggestions

24-Oct-01 17:43

I have to come up with a topic for my C++ final and was woondering if anyone had any suggestions for some topics?

Re: final proect for C++ suggestions

Nish Nishant24-Oct-01 19:56

Nish Nishant

24-Oct-01 19:56

mostly people do something networking-related
like proxy servers and stuff like that
you can add NAT features
and SSL tunneling etc...

Nish

How to implement this form?

Speed_cn24-Oct-01 16:50

Speed_cn

24-Oct-01 16:50

I want to implement a data import form like Access.
How to do it.
Please help me.
thanks.

Re: How to implement this form?

Christian Graus24-Oct-01 17:04

Christian Graus

24-Oct-01 17:04

I must admit I'm not overly familiar with Access, I only use it to verify my ADO code is working. What data import form, and what do you want it to actually do for you, or do you only want help with the GUI part of it ?

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

Re: How to implement this form?

24-Oct-01 17:13

I want to get lots data item from a control like Access.
Then I get the info from it to create a TCP msg for sending.
I don't want to use a Database,only to get info with a friendly way.;P

Re: How to implement this form?

Christian Graus24-Oct-01 18:06

Christian Graus

24-Oct-01 18:06

So you're actually asking a GUI question ? Could you direct me how to find the form you're talking about in Access 2000, so I can see what you want ?

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

Re: How to implement this form?

Nish Nishant24-Oct-01 19:58

Nish Nishant

24-Oct-01 19:58

I think he prolly means that he has some form elements like text boxes, combos etc.which he wants to fill up using data from a database

or perhaps he wants a DBGrid control

Nish

PlugIn For Microsoft Outlook

24-Oct-01 16:12

Can any one tell me how to write a plug in for Microsoft Outlook and other mail applications in vc?

Ur help will be highly appreciated.

Confused | :confused:

How to do in VC call VB Data

mornlee24-Oct-01 15:50

mornlee

24-Oct-01 15:50

In VC:
typedef struct tagDataSet{
UINT Row;
UINT Col;
LPCTSTR Tips;
double Data;
} *LPDATASET;

UINT WINAPI GraphToBitmap(LPDATASET lparDataSet[DATASIZE],LPBMPFILE lpFile,LPDATAPARAM lpDataParam,LPGRAPHPARAM lpGraphParam);

In VB:
Private Type LPDATASET
Row As Long
Col As Long
Tips As String
Data As Double
End Type
Private Declare Function GraphToBitmap Lib "XGraph.dll" (fdata As LPDATASET, tfile As LPBMPFILE, tdata As LPDATAPARAM, tchart As LPGRAPHPARAM) As Long

...
If GraphToBitmap(fdata(1), tfile, tdata, tchart) = 0 Then Debug.Print "OK"
...
But at this line error in vc
CString sBuff;
sBuff.Format("%d", lparDataSet[0]->Data);
MessageBox(NULL,sBuff,"",MB_OK);
sBuff.Format("%d", lparDataSet[1]->Data);
MessageBox(NULL,sBuff,"",MB_OK);
How to do?
thanks Mad | :mad:

MDI Without DocView

Christopher Lord24-Oct-01 14:25

Christopher Lord

24-Oct-01 14:25

I am thinking of various options for the interface to a new program I am starting.
One option I am considering is a Photoshop-like interface, with a toolbar, and various control and param windows, as well as a docking window on the side or something. the difference is that there would be no 'document', just the control windows. The current version of this application simply throws windows around the desktop, and opens new ones on a whim. each window is significantly different.

My understanding of DocView does not lead me to believe it can do such a thing (its more for multiple views of various forms of the same basic types of data). Is there a way to get this to work without resorting to complex hacks?

\\ Rock

Re: MDI Without DocView

Christian Graus24-Oct-01 14:33

Christian Graus

24-Oct-01 14:33

No, with MDI you can define multiple document types as well as multiple views, so you can have significantly different ways of showing the same data, or of showing different data. This is really the strength of the doc/view architecture, the fact you can use one representation of your programs data and link to it with differing ways of showing the contents of the document.

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

Re: MDI Without DocView

Christopher Lord24-Oct-01 14:39

Christopher Lord

24-Oct-01 14:39

Yes, but what I mean is that I dont need all the functionality of a view. just a simple window. (think the VB IDE without and documents in the main window. just control windows...)

docking controls would work as well, however they would have to have full support for controls and all the good stuff.

\\ Rock

Re: MDI Without DocView

Christian Graus24-Oct-01 14:44

Christian Graus

24-Oct-01 14:44

In that case, I guess you can just create a window and write your own 'views' of the data as you choose to store it. However, your first question seemed to be if MDI could handle what you want, and it can.

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

VC++ copy variables data?

Todd Smith24-Oct-01 13:36

Todd Smith

24-Oct-01 13:36

Why can't I do a copy'n'paste from the variables window or quickview? I want to copy the value out and paste it somewhere. How did they screw such a simple thing up? Does anyone know of a way to get at that data?

Re: VC++ copy variables data?

The_Server24-Oct-01 22:35

The_Server

24-Oct-01 22:35

You can use the watch window.

BTW: come to #CodeProject on DalNet (mIRC)

Formatting Double

AJ12324-Oct-01 12:20

AJ123

24-Oct-01 12:20

Hi,

I want to format a flot into a string rounded to three digits.

I thought the code, should work.

double dtest = 10.329;

char buffer[255];
wsprintf(buffer,"%10.2f",dtest);
MessageBox(buffer);

Cheers

Rich

Re: Formatting Double

Christian Graus24-Oct-01 12:28

Christian Graus

24-Oct-01 12:28

wsprintf(buffer,"%.3f",dtest);

will round it to three digits past the decimal point.

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

wsprintf does not work with doubles

Tomasz Sowinski25-Oct-01 1:14

Tomasz Sowinski

25-Oct-01 1:14

Unfortunately, wsprintf (part of Win32 API) doesn't accept %f, %g or %e. sprintf from stdio.h will do the job - it recognizes escape sequences for floating point.

Tomasz Sowinski -- http://www.shooltz.com

Re: Formatting Double

Mike Burston24-Oct-01 12:52

Mike Burston

24-Oct-01 12:52

You can also use the standard library "stringstream" class to format a std::string, like this :

double dTest = 10.329

std::stringstream ss;
ss << setiosflags( ios::fixed ) << setprecision(3) << dTest;
cout << ss.str();  // "10.329"

std::stringstream ss;
ss << setiosflags( ios::fixed ) << setprecision(2) << dTest;
cout << ss.str();  // "10.33"

std::stringstream ss;
ss << setiosflags( ios::fixed ) << setprecision(1) << dTest;
cout << ss.str();  // "10.3"

This looks like more code/work for such a simple example, but often this ends up saving you code if you then have to use the 'string' in other functions.

The standard library stringstream also has the advantage that you can extend it in two ways:
(a) writing your own manipulators (for example, you can write a 'percent' manipulator that converts a value into a percentage as it is written to the output;
(b) you can write inserters/extractors for user defined types, so that you can use the same syntax to write your own types as you do for the 'built in' types like double.

-----------------------
The sermon on the mount...

Man 1 : Hear that? Blessed are the greek.
Man 2 : The greek?
Man 1 : Well apparently, he's going to inherit the earth.
Man 2 : Did anyone catch his name?

"STL & typedef problem" of MFC extened DLL programing

24-Oct-01 11:37

Dear sir,

I met a strange probelm when I am trying to program my first
MFC extended DLl. That is, I need to use STL in my DLL and
I define some date type such as:

typedef CArray<char,char> CStatusArray;
typedef CArray<int,int> CIndexArray;

But When I compile the file, I got

error C2143: syntax error : missing ';' before '<'
error C2143: syntax error : missing ';' before '<'
warning C4091: 'typedef ' : ignored on left of 'int' when no variable is declared

I know this is related to the DLL programming itself since the error is not
incurred in my MFC exe project. But I am new to DLL programming. So I am posting this to get your help. Thank you very much and any suggestion is welcome.

Best regards,

Cheng LEI

Re: "STL & typedef problem" of MFC extened DLL programing

Christian Graus24-Oct-01 11:47

Christian Graus

24-Oct-01 11:47

You're not using STL, you're using the Microsoft container classes. A CArray needs to have two templated arguments to tell it what to contain ( STL containers need one ). You probably *should* use STL, but that is another story.

The problem is not the typedef, but the fact that you probably have not provided the template arguments either in the typedef or the instances you use your typedefed names. Wthout providing the template arguments in the typedef, I can't see any reason for it myself. I never bother with typedefs at all, but they can make code more readable for people who are not familiar with templates or (in my case) STL.

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

Re: "STL & typedef problem" of MFC extened DLL programing

24-Oct-01 19:28

Dear Christian and Michael,

Thank you for your helpful suggestion. I added #include "afxtempl.h" as
Michael said and there is no more errors. The original errors are not due to STL. Very sorry for this. In fact, there are some parts using STL in my code
such as

struct TrackedFeature {
CvPoint2D32f m_cvPoint;
int m_videoframe_index;
};

typedef std::list<trackedfeature> CvFeaturesList;
typedef CvFeaturesList::iterator CvFeaturesList_It;

I made a mistake to think the error is from STL. I am sorry, STL. Smile | :)

Now, I have another question, maybe caused by my not-so-good programming
skills. That is, I want to make my View and Doc class in a "MFC exe " project as a DLL to be used by other projects. But in the code, I need to get the
point of the "Application" (by AfxGetApp()). Since there are some project-specific memebers to be used in the class of "***App", such as a point to
another view class, it makes me unable to visit such members by just geting
a CWinApp using AfxGetApp(). What I am wondering is how I can get around with this. I think this problem is completely caused by my bad programming way.
But there is no much time left, so I hope no much modification needed.

I don't know if I said my question clearly. Wish to get your further suggestions. Anyway, thank you very much for your help on my last problem
and I will try to solve the new problem myself independently. I should not
always bother others with some maybe too trival questions Smile | :)

But it's better
if I could get suggestions from you, the code gurus Smile | :)

Thank you very much again.

Best regards,

Cheng LEI

Re: "STL & typedef problem" of MFC extened DLL programing

Michael Dunn24-Oct-01 19:44

Michael Dunn

24-Oct-01 19:44

Cast the return value of AfxGetApp() to your CWinApp-derived type:

CMyApp* pMyapp = (CMyApp*) AfxGetApp();

A word of caution though, if you rely on this in your DLL, then you must make an MFC regular DLL, not an MFC extension DLL. An extension DLL shares the CWinApp object of the EXE, whereas a regular DLL has its own CWinApp object.

--Mike--
http://home.inreach.com/mdunn/
This posting is provided "as was" with no warranties, guarantees, lotteries, or any of those little bags of peanuts you get on planes. You assume all risk for crossing the street without holding mommy's hand. © 2001 Mike's Classy Software. Member FDIC. If rash develops, discontinue use.
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Re: "STL & typedef problem" of MFC extened DLL programing

24-Oct-01 20:23

Dear Sir,

So as you said, in my extension DLL, I should avoid using the App class.
It's realy bad and I will make corresponding modifications. Hope I am luckyenough to finish it in time Smile | :)

By the way, I visited your homepage and found a lot of useful stuff.
You self-introduction hoempage is funny Smile | :)

Thank you again!

Best regards,

Cheng LEI

Re: "STL & typedef problem" of MFC extened DLL programing

Michael Dunn24-Oct-01 20:42

Michael Dunn

24-Oct-01 20:42

hee, thanks Smile | :)

Good luck with the project.

--Mike--
http://home.inreach.com/mdunn/
This posting is provided "as was" with no warranties, guarantees, lotteries, or any of those little bags of peanuts you get on planes. You assume all risk for crossing the street without holding mommy's hand. © 2001 Mike's Classy Software. Member FDIC. If rash develops, discontinue use.
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