C / C++ / MFC

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vcsample98/html/_sample_mfc_wordpad.asp[^]

Michael

'Logic, my dear Zoe, merely enables one to be wrong with authority.' - The Doctor: The Wheel in Space

31-Oct-03 6:38

Polar Plots (repost)

jhorstkamp31-Oct-03 3:55

jhorstkamp

31-Oct-03 3:55

All,
Has anyone here done any work with polar plots and graphs in vc++.
If so can you give me any tips as to how to start?
Any graphics classes out there that have implemented polar plots etc?

Thanks in advance.

Sorry for the repost - for some reason it thought I hit the submit button before I started the
main part of this message...

John

Jason Henderson31-Oct-03 4:21

Jason Henderson

31-Oct-03 4:21

I haven't done it in C++ but what do you need to know?
The math behind it or drawing to the window?

"We have done so much in the last 2 years, and it doesn't happen by standing around with your finger in your ear, hoping everyone thinks that that's nice." - Donald Rumsfeld

Jason Henderson
blog

jhorstkamp31-Oct-03 5:38

jhorstkamp

31-Oct-03 5:38

Mainly drawing to the window...I think Smile | :)

For a variety of reasons I've been tasked to port a Matlab script (and add more functionality) to vc++. I've got my coordinate data, and in looking into Matlab, it seems like they just draw a circle, translate the polar coordinates to xy and draw lines in the circle. There's got to be more to it than that.
I don't know how to start drawing this in a window (dialog). Can I do this in a dialog, or do I need a view and a DC? If so, can I put a view in a dialog?
Any help or pointers in the right direction would be appreciated!

Thanks
John

Rick York31-Oct-03 7:03

Rick York

31-Oct-03 7:03

Step one is to get a DC. Alternatively, you can pass in an HWND and obtain one.

You do not need a view - just a DC that you can obtain window coordinates from.

A polar to window coords conversion function will come in handy too.

Good luck.

The Ten Commandments For C Programmers

IGeorgeI31-Oct-03 9:01

IGeorgeI

31-Oct-03 9:01

Hi John

1) first you need a DC to the dialog

- I suggest you add an empty control to the dialog first, and get the DC from the control. That way your coordiante system is relative to the control(drawing area) this make life easier.

2) create a "polar transform" method that is fast and efficient.

- this transform will be called every single time any rendering or user interaction with the graph occurrs so BE efficient.
- All incomming polar data is to be formatted through this transform and the resulting cartesian data will be rendered in your offset DC fron the control.

There is of course a lot more to it, especially when you consider user interaction, zooming, flicker free panning etc. But that is all pretty standard stuff.

If you want to see a very good example of an XY or polar plot, check out our company website at

homepage - www.zsystems.ca
Active x - www.zsystems.ca/devtools.htm
ZAX download - http://www.zsystems.ca/downloads.htm

Download the ZAX demo and play around with the XY/Polar plot in there.

If you have any questions on how we did anything, feel free to contact me directly.

Good luck

George W

Software Developer
www.zsystems.ca

jhorstkamp31-Oct-03 10:00

jhorstkamp

31-Oct-03 10:00

Thanks for the advice guys!
This will give me a starting point.
I may have more questions...

John

I wanna know how to detect file and folder deletion

Gary R. Wheeler31-Oct-03 13:22

Gary R. Wheeler

31-Oct-03 13:22

John - I don't know how deep your pockets are, but you may want to look into a third party library. That might be faster and a lot easier than building your own charting capability. you might check out the Dundas Chart gizmo; it's advertised here on Code Project.

Software Zen: delete this;

Polar Plots

Anonymous31-Oct-03 3:49

Anonymous

31-Oct-03 3:49

Hi,

User 21559731-Oct-03 2:55

User 215597

31-Oct-03 2:55

Hi there
I am currently working on a project in which i need to detect whether a file and/or folder is being deleted.
I have used CopyHook Handler but it asks whether to delete a folder or not.
I have used SHChangeNotifyRegister but it works only for files and not for folders.
Also it gives me multiple notificatioin for the same file.

Please if anybody has some solution then help me.
Its my "Semester Project " and the time is running out.

Your fellow programmer

modified 21-Apr-21 21:01pm.

Re: I wanna know how to detect file and folder deletion

vcplusplus31-Oct-03 5:20

vcplusplus

31-Oct-03 5:20

FindFirstChangeNotification(....);
WaitForSingleObject(...);
FindNextChangeNotification(...);
FindCloseChangeNotification(...);

Use this in a thread(AfxBeginThread(...)) and post a message to your app when something changes.

about playing .wav file

yingkou31-Oct-03 2:07

yingkou

31-Oct-03 2:07

I want to know how to play .wav file.I have downloaded a example here,but I don't understand the procedure on playing .wav file.a question that is the relation between the WaveFormatEx and HMMIO( the function of mmioOpen return value).can't the OS find the sound data automatically only by given WaveFormatEx in Memory?

Re: about playing .wav file

Graham Bradshaw31-Oct-03 2:30

Graham Bradshaw

31-Oct-03 2:30

You might be making this harder than it needs to be. Assuming you have the path to a wav file in variable, say szSoundFile

::PlaySound(szSoundFile, NULL, SND_FILENAME | SND_ASYNC | SND_NODEFAULT);

will play the sound for you. There's a whole bunch of options controlling how PlaySound works, relating to how currently playing sounds are handled and so on, but all the flags are documented in the platform SDK.

You'll need to #include "mmsystem.h", and link to winmm.lib, but that should do it for you.

a very basic quest!

31-Oct-03 1:42

the following is a bit of the code iam using! to access a database.
ConStr[0] = '\0';
strcat(ConStr, "SELECT * FROM prodlist WHERE product_name = 'aegis 1.0'");
pRecordset = m_pConnection->Execute(ConStr, vRecordsAffected, 1);

Now I want to assign it to another variable and then use the variable in place of 'aegis 1.0'.
to what variable should i assign it??

ranjani

Michael P Butler31-Oct-03 2:11

31-Oct-03 2:11

CString strProductName;
CString strSelect;

strProductName = "aegis 1.0";
strSelect.Format("SELECT * from prodlist WHERE productname = '%s'", strProductName);

pRecordset = m_pConnection->Execute(strSelect, vRecordsAffected, 1);

Michael

ranjjj31-Oct-03 2:27

ranjjj

31-Oct-03 2:27

my code doesn't recognize CString as a keyword.
do i have to include any spl header files for that??

ranjani

Michael P Butler31-Oct-03 2:34

31-Oct-03 2:34

CString is a MFC/WTL class. I just assumed you had an MFC project.

Michael

'Logic, my dear Zoe, merely enables one to be wrong with authority.' - The Doctor: The Wheel in Space

ranjjj31-Oct-03 2:39

ranjjj

31-Oct-03 2:39

ok..what do i have to do now to solve my problem..??
kindly help me in this regard!

ranjani

Click on balloon tooltip handling

ranjjj31-Oct-03 2:58

ranjjj

31-Oct-03 2:58

thank u
have got a soln.

ranjani

kotbegemot31-Oct-03 1:21

kotbegemot

31-Oct-03 1:21

How can I catch mouse click on ballon tooltip near the system tray icon?

Some questions

DaFrawg31-Oct-03 1:08

DaFrawg

31-Oct-03 1:08

1) Why doesn't \n work in CEdit controls, but \x0D\x0A has the right effect?

2) How to notify the compiler that you have ended the \x escape char? ("\x0D\x0AEllo world" will not be impreted as newline+"Ello world", but somehow as something where the first E will be a part of the second \x)

3) Programs like Alcohol 120% (advanced CD-ROM/-RW or DVD-ROM/-RW/+ROM/+RW etc. burning), have some controls that are not system standard, but have "TList" or something as template name. Where can I find them? (I have not yet tried to find them in the dependency files)

4) (Slightly offtopic)
A) What sound event is launched when WinXP shows it's fatal exception error dialog? (click here to see some tech info on the crash etc.)
B) How to set a set of sounds to one sound event, and each time te event is launched, one (random) of the sounds will be played?

5) How to make a static control which contains a hyperlink?

Re: Some questions

Michael P Butler31-Oct-03 1:22