C / C++ / MFC Discussion Boards

Rage2-May-14 3:37

2-May-14 3:37

I do not know which part you want to crocodile-bite, but maybe you can plug one of these boards on a larger board with expanded crocodile-friendly biting zones. A zoomer of some sort Big Grin | :-D

~RaGE();

I think words like 'destiny' are a way of trying to find order where none exists. - Christian Graus
Entropy isn't what it used to.

Re: Embedded C

C-P-User-32-May-14 5:30

C-P-User-3

2-May-14 5:30

Rage wrote:
A zoomer of some sort

Yes, that's the whole idea; my full contention.

i.e.,,,,,,,,

If we could make these things large enough to work with, we could create stuff on our desks, first, and make them work, and watch them in real life, and do (an awful lot of) the validation and verification ahead of time, and get the bugs out first, BEFORE we shrink them so small that they become inaccessible to human hands.

That's my whole idea: itty bitty microprocessors and microcontrollers, on boards which have posts and clip-ons and access points that are large enough for bumble-thumbs like me.

(Unless, of course, I'm the only one who can't access two pieces of metal when they're closer than a millimeter)

forget alligator clips

Member 798013518-May-14 16:22

Member 7980135

18-May-14 16:22

Re: The reason: It's so small that I honestly have great difficulty connecting alligator clips to the various pins.

Forget the alligator clips. Get a crimper and some socket and pin ends that match the connector or pins available. Crimp the pin/socket on the end of your wire and put anything you want on the other end. Use various colors of wire to make it easy.

To the OP, do some googling on demo and prototype boards. If you are really serious, for less than $100 you can get a demo/prototype board for just about any type of processor. Usually way less.

Edit: Get some heat shrink tubing to insulate the crimped end.

Re: Embedded C

Munchies_Matt3-May-14 9:43

Munchies_Matt

3-May-14 9:43

Device drivers are of course a good way to learn all about USB, UARTs, interrupts etc, but, you also need to learn a heck of a lot of Kernel/OS stuff too, so even though Linux is easier than Windows, kernel wtuff might be too daunting for him so I would go for a dev board with a very simple model so he can focus just on HW.

"The whole idea that carbon dioxide is the main cause of the recent global warming is based on a guess that was proved false by empirical evidence during the 1990s." climate-models-go-cold

Re: Embedded C

Joe Woodbury2-May-14 10:25

Joe Woodbury

2-May-14 10:25

You could look at the beagle board. It has support packages for many operating systems.

http://beagleboard.org/[^]

run CMD tree command in c Language

dipesh_karmakar28-Apr-14 19:10

dipesh_karmakar

28-Apr-14 19:10

I want to use the Windows CMD tree command in my C++ console application.it is possible ?

Re: run CMD tree command in c Language

enhzflep28-Apr-14 19:59

enhzflep

28-Apr-14 19:59

Yes.
It's both possible and very easy, as it turns out.

Drawing on an old (and frowned-upon) practise of using a system call to clear the screen or wait for a keystroke,

C++

system("CLS");

and

C++

system("PAUSE");

You can achieve your aim using the system function. Just remember to use forward-slashes (/) in the path-name or to use double back-slashes (\\)

E.g

C++

system("tree c:\\xampp");
// or
system("tree c:/xampp");

Re: run CMD tree command in c Language

dipesh_karmakar1-May-14 23:49

dipesh_karmakar

1-May-14 23:49

Error in code plz help me...

XML

#include<stdio.h>
#include<conio.h>
#include<dos.h>
#include<windos.h>
void main(){
system("tree c:\\xampp");
getch();
}

Re: run CMD tree command in c Language

Richard MacCutchan2-May-14 1:11

Richard MacCutchan

2-May-14 1:11

Apart from the fact that you mis-spelt windows, what else is wrong?

Re: run CMD tree command in c Language

dipesh_karmakar2-May-14 1:25

dipesh_karmakar

2-May-14 1:25

compilation Error is given :

Unable to Open include File ''windows.h

Re: run CMD tree command in c Language

Richard MacCutchan2-May-14 1:45

Richard MacCutchan

2-May-14 1:45

The code you showed above has it spelled as windos.h (missing the last w character). If it is spelled correctly then ensure you have set the path(s) foe the correct include directories. If you are using visual Studio then this should have been done for you at install time.

How to keep Size of Application Constant [Dialog Based]

002comp28-Apr-14 18:43

002comp

28-Apr-14 18:43

Hello Friends
I created a Dialog based application in MFC Inherited from CFormView. I created this application on resolution 1024 X 768. But when I am opening the same application on another system with Higer Resolution then window is opening of full size in window with Extra Blank space in application other than Controls.

Can we make application size Constant or make maximize button disable so tht on Higher resolution Desktop,it will not open up with blank space ?

Or
Can we resize controls according to resolution ?

Thanks & Regards
Yogesh Sikri

Re: How to keep Size of Application Constant [Dialog Based]

CPallini28-Apr-14 22:08

CPallini

28-Apr-14 22:08

Both approaches are feasible and valid.
Have a look at this page: Limiting Window Resizing - Resizing Controls[^].

Veni, vidi, vici.

Help creating a Do-While loop

Member 1078182828-Apr-14 15:18

Member 10781828

28-Apr-14 15:18

I need help starting a do-while loop in my program that runs up to 10 time that asks the user to enter up to 10 scores, which include the slope and rating for the course, and calculates the handicap for each score. Any help is greatly appreciated. Here's what I have so far:

CSS

//This program calculates a golfers handicap.
#include <iostream>
#include <string>
using namespace std;

int main()
{

    int score, slope;
    double rating, handicap;
    string name;


   cout << "This program calculates a golfer's handicap.\n";

//Have the user to input their name, score, slope, and handicap.
    cout << "Enter your name: ";
    cin >> name;
    cout << "Hello " << name << endl;
    cout << "Please enter your score: ";
    cin >> score;
    cout << "Please enter the course slope: ";
    cin >> slope;
    cout << "Please enter the course rating: ";
    cin >> rating;

//Calculate the golfers handicap
    handicap = (score-rating) * 113 / slope ;
    cout << "Your handicap is " << handicap << endl;


return 0;

}

Re: Help creating a Do-While loop

Garth J Lancaster28-Apr-14 15:34

Garth J Lancaster

28-Apr-14 15:34

think count adding a counter to count the number of scores, maybe

C++

int scorecount = 0;

and at the end of a score 'collect', increment the counter

C++

scorecount += 1;

then you need to add something like

C++

do
    {
        // something here
    }
while scorecount //some test here ;

around your logic - you textbooks/google should also be able to fill these gaps in for you

Question : are you sure do-while is what you really need here - what are the pitfalls with it ?

'g'

Re: Help creating a Do-While loop

Member 1078182828-Apr-14 15:42

Member 10781828

28-Apr-14 15:42

Thank you very much Garth. Yes my text calls for a Do-While loop that runs up to 10 times and asks the user to enter up to 10 scores, which include the slope and rating for the course, and calculates the handicap for each score. Then I'll need to use either parallel arrays or a two-dimensional array in order to store the score, slope and rating for each entry, and variables for the handicap accumulator and number of scores entered.

Re: Help creating a Do-While loop

Garth J Lancaster28-Apr-14 15:59

Garth J Lancaster

28-Apr-14 15:59

fair enough - you can see then using a counter, that you might like to use that as the array index to store the values as well - just a thought Smile | :)

'g'

Re: Help creating a Do-While loop

chinkeymouse6-May-14 2:58

chinkeymouse

6-May-14 2:58

Well,i'm glad to help you.It's my way to solve the problem.In my point,it's exactl solution.Thank you.

Quote:
//This program calculates a golfers handicap.
#include <iostream>
#include <string>
using namespace std;
int main()
{
int score, slope;
double rating, handicap;
string name;
int time=1;
cout << "This program calculates a golfer's handicap.\n";
cout << "Enter your name: ";
cin >> name;
cout << "Hello " << name << endl;
//Have the user to input their name, score, slope, and handicap.
do{
cout << "Please enter your score: ";
cin >> score;
cout << "Please enter the course slope: ";
cin >> slope;
cout << "Please enter the course rating: ";
cin >> rating;
//Calculate the golfers handicap
handicap = (score-rating) * 113 / slope ;
cout << "Your handicap is " << handicap << endl;
time++;
}while(time<=10);
return 0;
}

Please help me. Where to use <dynamic_cast> in c++ with example?

shaktikanta28-Apr-14 7:10

shaktikanta

28-Apr-14 7:10

behavior of <dynamic_cast> with abase/derived scenario and how it is useful.thanks in advance.

Re: Please help me. Where to use <dynamic_cast> in c++ with example?

jeron128-Apr-14 7:37

jeron1

28-Apr-14 7:37

here[^], here[^], maybe here[^] I'm sure there are examples all over the web.

Re: Please help me. Where to use <dynamic_cast> in c++ with example?

CPallini28-Apr-14 10:48

CPallini

28-Apr-14 10:48

jeron1 wrote:
I'm sure there are examples all over the web.

I'm sure you are pretty right.

Veni, vidi, vici.

Re: Please help me. Where to use <dynamic_cast> in c++ with example?

shaktikanta1-Aug-14 2:39

shaktikanta

1-Aug-14 2:39

dynamic_cast must be useful in parent child relation of classes. It helps to determine object type in a hierarchy.
i.e - class Base{
};
class Derived1:public Base{
void der1Fun(){}
};
class Derived2:public Base{
};

int main()
{
Base *bPtr = new derived1();
//now we want to call a derived1 function let der1Fun()
Derived1* dPtr = 0;
if( dPtr = dynamic_cast<derived1*>(dPtr) ){
dPtr->der1Fun()
}
else{
//Display the object is not of derived1 type
}
return 0;

}
I think this is why we need dynamic_cast.

Re: Please help me. Where to use <dynamic_cast> in c++ with example?

Stephen Hewitt28-Apr-14 15:14

Stephen Hewitt

28-Apr-14 15:14

In general I would suggest you don't use it, having to tends to suggest you have some badly designed code. Prefer inheritance and virtual functions.

Steve

Re: Please help me. Where to use <dynamic_cast> in c++ with example?

Joe Woodbury2-May-14 10:26

Joe Woodbury

2-May-14 10:26

I concur with Stephen. Almost every example I've seen is contrived. There are a few exceptions, though with some of those better design would prevent having to use it.

how to show a search bar in my class derived from CHtmlView

joshua013727-Apr-14 2:33

joshua0137

27-Apr-14 2:33

i write a class derived from CHtmlView, and write the code as below, when it run, no bar appear, and a messageBox show a string '0x80040100', what is the reason? how can i make it work. any suggestion or help are appreciated

C++

void CXxView::OnShowBar() 
{
	IWebBrowser2 *pBrowser = NULL;
	// Ensure that our site is an browser window
	HRESULT hr = m_pBrowserApp->QueryInterface(IID_IWebBrowser2, (void **) &pBrowser);
	if (SUCCEEDED(hr))
	{
		// Display the band object (the Search bar in this case)
		VARIANT vtBandGUID, vtShow;
		vtBandGUID.vt = VT_BSTR;
		//change the CLSID as your bar CLSID
		vtBandGUID.bstrVal = SysAllocString(OLESTR("{30D02401-6A81-11d0-8274-00C04FD5AE38}"));
		vtShow.vt = VT_BOOL;
		vtShow.boolVal = TRUE;
		HRESULT hrx = pBrowser->ShowBrowserBar(&vtBandGUID, &vtShow, 0);
		if (FAILED(hrx))
		{
			CString _str;
			_str.Format("0x%x", hrx);
			AfxMessageBox(_str);
		}

		SysFreeString(vtBandGUID.bstrVal);
		pBrowser->Release();
	}
}

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