C / C++ / MFC Discussion Boards

Waldermort4-Feb-07 7:19

4-Feb-07 7:19

I don't know about CAD but OleLoadPicture is able to load a JPEG image into an IPicture instance. Search the article on CP to know how to load the picture. Once loaded you will have HBITMAP which is what most of the GDI functions use when drawing to the screen.

Create a window, or choose a RECT in your main window. Use GetDC() CreateCompatibleDC() SelectObject() and BitBlt(), or StretchBlt(), to draw the picture to the screen. Then draw your dot on top of this image using SetPixel() for a single dot, or Ellipse() if you want something a little bigger.

Re: MAPS

Hamid_RT4-Feb-07 7:43

Hamid_RT

4-Feb-07 7:43

In addition with WalderMort see http://www.wotsit.org[^] about cad files Wink | ;)

WhiteSky

Re: MAPS

sameer224-Feb-07 8:27

sameer22

4-Feb-07 8:27

Thanx , i ll try.
Much Appreciated.

Re: MAPS

Hamid_RT4-Feb-07 8:30

Hamid_RT

4-Feb-07 8:30

You're welcome Wink | ;)

WhiteSky

Re: MAPS

ThatsAlok6-Feb-07 20:18

ThatsAlok

6-Feb-07 20:18

sameer22 wrote:
I want to track user's position on aGUI containing a map , but I have no idea about images and maps and how to import them and use them in VC++.
I hope someone will show me a webpage or book about this topic.

try google api.. search google for same!!!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
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Unable to create an automation project using MFC and a type library

milltooth4-Feb-07 5:35

milltooth

4-Feb-07 5:35

I'm having problems using the following MicroSoft example.
http://support.microsoft.com/kb/178749[^]

When I get to step 6. "Add an include directive for each header file..."

If I try to complile I get 187 errors. Here's the 1st one.

Error 1 error C2371: 'FontPtr' : redefinition; different basic types c:\documents and settings\dan\my documents\visual studio 2005\projects\auotexcel\auotexcel\debug\excel9.tlh 982

I'm running Visual Studio 2005, Microsoft Excel 11.0 Type Library, Windows 2003 Server.

Thanks for any help.
Dan

Global variables [modified]

Makakuin4-Feb-07 5:05

Makakuin

4-Feb-07 5:05

Hi! I`m creating a dialog based application with one main dialog containing TabCtrl each of tabs in TabCtrl contain individual dialog. This application will be used for ticket printing in a museum and each tab is for different ticket type, where you will only need to enter the count of visitors. The ticket prices are held in a database. To avoid the need to access database each time the price of a ticket needs to be read, I want to create a global Struct variable, then on applications InitInstance() read the values in to that variable.

Example:

Struct prices<br />
   {<br />
     double price1;<br />
     double price2;<br />
     double price3;<br />
     double price4;<br />
   };<br />

I tried defining the struct in applications header file, then after class definition in same header I added line:

extern CMyApp::prices price;

Later in applications InitInstance() I call:

CMyApp::prices price;

That way I`m able to access price.price1, price.price2.. etc. in any class.

Iv`e heard about creating seperate class for global variables and then access them like CMyGlobals::Variable...
What is the best way of creating global variables? And what is your opinion of my solution.

Thanx!

-- modified at 11:10 Sunday 4th February, 2007

Re: Global variables

Waldermort4-Feb-07 6:20

Waldermort

4-Feb-07 6:20

Using global variables is often very undesirable in C++. I recommend, instead of creating a global struct, create a singleton class.

class Prices {<br />
private:<br />
  Prices();<br />
  ~Prices();<br />
public:<br />
  static Prices* CreateInstance(){<br />
    static Prices;<br />
    return &Prices;<br />
  }<br />
}

Then, anytime you want to get your prices, just call Prices::CreateInstance().

You could even create the class in such a way that it must be initialized with the ticket prices before CreateInstance will return a pointer.

Re: Global variables

ThatsAlok6-Feb-07 20:19

ThatsAlok

6-Feb-07 20:19

much better would you create singleton class use it through out the project!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and you

Saving with property sheet

DanYELL4-Feb-07 4:53

DanYELL

4-Feb-07 4:53

I have a property sheet in a CFormView. The property pages dont
seem to be created until I visit the specific View, so I do not
want to transfer data from a CPtrArray to display in the property
page until the property page is created.

What function can I use in my View or property pages to transfer data
from a CPtrArray to actually display in the property page? I cant use
OnUpdate. If I do, this is called before I visit the property page and before its Window is created. I have not had any luck with OnActiveView in the CFormView (which would then load data from the property pages).
I tried OnSetFocus and that really throws the whole program off; I cant
type data in edit boxes or doing other really small things. I tried
OnInitialUpdate as well.

Im trying to find a function to call in my CFormView class or in the
property pages that will then let me display data on the property
page.

Please, please, any response any one can give me will be greatly
appreciated.

Sincerely,
Danielle Brina

Re: Saving with property sheet

Mark Salsbery4-Feb-07 9:04

Mark Salsbery

4-Feb-07 9:04

In the property pages:

OnInitDialog() is first chance you get to access the page's dialog with a valid HWND.
Just like any dialog, it's a great place to initialize/populate controls.

OnOk() is the last chance.

OnKillActive() gives you a chance to validate user input before allowing the user to switch pages
or leave the sheet.

motion detection

ceejeeb4-Feb-07 3:54

ceejeeb

4-Feb-07 3:54

I have developed an application that grabs frames from a webcam, but i now need to compare these frames for motion(differences). I have had a look around and the only method i found was to compare each pixel in each frame but the speed of this is far to slow to be pratical.
Can any help me out?

Re: motion detection

Waldermort4-Feb-07 6:25

Waldermort

4-Feb-07 6:25

You don't need to compare each pixel.

Depending on the size of the images ( lets say 640, 480 for example ), build an array of points each indexing a point in the image ( every 50 pixels maybe ). Then in your loop, only call GetPixel() for those points. If 30% of them changed since the last time, you have detected movement.

Re: motion detection

ceejeeb5-Feb-07 1:57

ceejeeb

5-Feb-07 1:57

True this does speed up my program but i need to pinpoint the motion and highlight it.

GetDlgItemText getting a float

Johpoke4-Feb-07 3:19

Johpoke

4-Feb-07 3:19

Ok, so im running MS Visual C++ 6.0, programming a C++ MFC program.

Im my dialog i have a edit box (locked to numbers) were the user will type in a float (a price)

So then i have to use GetDlgItemText go get the float into a CString (cant use getdlgitemint as it looses the decimals)

but now i then need to convert the cstring (containing someting like 29.88) into a normal float, like this:

Main->Price=cstringprice;

ive tried loads of things, like atof.. but all of them make errors when trying to use the variable it set

so got any better ideas of getting a float from the dialog into a float? or converting what GetDlgItemText brings into a float?

thanks!

/Johannes

Re: GetDlgItemText getting a float

Waldermort4-Feb-07 6:31

Waldermort

4-Feb-07 6:31

atof() should work just fine. Perhaps you could show the code for your converting and we may be able to point out the error.

Re: GetDlgItemText getting a float (SOLVED)

Johpoke4-Feb-07 7:29

Johpoke

4-Feb-07 7:29

Ah solved it, problem was elsewhere

thanks anyway!

/Johannes

Re: GetDlgItemText getting a float

Hamid_RT4-Feb-07 7:35

Hamid_RT

4-Feb-07 7:35

You can use of

CString str;
str.Format("%lf",28.29);

But what errors when used of atof?

WhiteSky

Re: GetDlgItemText getting a float

ThatsAlok6-Feb-07 20:19

ThatsAlok

6-Feb-07 20:19

try _ttod

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and you

Locking keyboard and mouse of a computer in the same LAN using C++ or Java

Sara_fjr4-Feb-07 2:35

Sara_fjr

4-Feb-07 2:35

HI all,
please if any1 could provide me with required codes for locking keyboards and mouses of computers in the same LAN using Java or C++ and under Windows XP Os.

As I am a student working on my senior project, which is 2 implement an instructor control computer, that can control students' computers connected through LAN (I will work on two Pc's only,instructor and student). the teacher can lock their keyboards and mouses, and broadcast his/her desktop screen on their monitors.

Thank you.

Re: Locking keyboard and mouse of a computer in the same LAN using C++ or Java

Mark Salsbery4-Feb-07 9:12

Mark Salsbery

4-Feb-07 9:12

I weep for the company that hires the ex-student who got someone else to write his/her senior
project.

Have you learned anything as freshman/sophomore/junior? I mean everyone knows it's "mice".
not "mouses".

Re: Locking keyboard and mouse of a computer in the same LAN using C++ or Java

Waldermort4-Feb-07 9:23

Waldermort

4-Feb-07 9:23

Mark Salsbery wrote:
Have you learned anything as freshman/sophomore/junior? I mean everyone knows it's "mice".

She can't even write her own name. I suppose it save's on the red faces if her classmates saw these threads. Cool | :cool:

Re: Locking keyboard and mouse of a computer in the same LAN using C++ or Java

Sara_fjr4-Feb-07 10:32

Sara_fjr

4-Feb-07 10:32

Hey there,
thanks for being rude, and for your information I have completed a large part of my project which is broadcasting teacher desktop on students' PCs and transfering files between both sides, and I was looking for required commands and configuration for keyboard & mouse lock as an EXTRA FEATURE for my project.
Bottom Line: If you are not capable of providing any help please let others do, AND getting help from experts and websites is a common and right way to accomplish senior projects, hope it is not news for you!!!

Sara

Re: Locking keyboard and mouse of a computer in the same LAN using C++ or Java

Waldermort4-Feb-07 11:26

Waldermort

4-Feb-07 11:26

Do you not consider it rude to refuse those who want to help you the decency of knowing your name?

Do you not consider it rude to refuse allowing people to know a name even after repeated requests that you do so?

Perhaps you should think a little about your own manners before expecting people to help you.

So tell me, why did you finally name yourself? Was it because the site admin forced you to? Or maybe you were fed up of the low voting for your posts? Or maybe you had a reality check?

Re: Locking keyboard and mouse of a computer in the same LAN using C++ or Java

Sara_fjr4-Feb-07 11:44

Sara_fjr

4-Feb-07 11:44

Hi WalderMort,
My reply was for Mark Salsbery not for you, I read your comment after posting my second comment, and yah about the name issue,I am new to this site and didnt know that I have to post my name, as this site published my question without my name. And since you are making a big deal about my name, I am Sara A. Khan. Now if you can help me as you mentioned please go for it.

Sara

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