C / C++ / MFC

prasad_som19-Oct-05 2:02

prasad_som

19-Oct-05 2:02

Have you tried this?

CMyPropertyPage *page1=(CMyPropertyPage*)((CPropertySheet *)(GetParent())->GetPage(1));//for first page
//then use page1 for getting variable value.

Do remember to call UpdateData(), while handling OnNext of page.

David Crow19-Oct-05 3:33

David Crow

19-Oct-05 3:33

You'll need to derive a class from CPropertySheet, and store the information in it. Then in each page, just call GetParent() to access the information.

"Take only what you need and leave the land as you found it." - Native American Proverb

kiran janaswamy19-Apr-06 19:21

kiran janaswamy

19-Apr-06 19:21

hi david,

actually i am also facing the same problem. please proivide me a solution if you have. pls help me out for this solution.

thanks,
uday.

uday kiran

David Crow20-Apr-06 2:50

David Crow

20-Apr-06 2:50

kiran janaswamy wrote:
please proivide me a solution if you have.

What's wrong with this?

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

problem with _kbhit and i/o exception handling

PJ Arends19-Oct-05 5:28

PJ Arends

19-Oct-05 5:28

PSM_QUERYSIBLINGS[^]

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

"Obviously ??? You're definitely a superstar!!!" - mYkel - 21 Jun '04

"There's not enough blatant self-congratulatory backslapping in the world today..." - HumblePie - 21 Jun '05

Within you lies the power for good - Use it!

codeingit19-Oct-05 1:24

codeingit

19-Oct-05 1:24

hi,
I want to generate random numbers in c++ (using vc++ 6.0) on hit of enter. I am using _kbhit(), but don't know how to reset it, so that I can use it again, can anybody help me with this.
code is say like following.

#include <iostream>
#include <conio.h>
#include <windows.h>
using namespace::std;

int main(int argc, char* argv[])
{
for(int i=0; i<10; i++)
{
cout << "hit enter to generate random number" << endl;
int ran1 = func1();
cout << "hit enter to generate random number" << endl;
int ran2 = func2();
}

return 0;
}

int func1()
{
int ret;

while(!_kbhit())
{
ret = rand()%10;
Sleep(1000);
}
return ret;
}

int func2()
{
int ret;

while(!_kbhit())
{
ret = rand()%20;
Sleep(1000);
}
return ret;
}

There is another problem with I/O exception handling:
i tried to read an int correctly using following code. but in case of exception it is caught but cin doesn't execute inspite of clearing it:

int main(int argc, char* argv[])
{
int i;
bool check = false;

cin.exceptions(ios_base::failbit);

while(!check)
{
try{
cout << "enter a number: ";
cin >> i;
check = true;
}catch(ios_base::failure){
cin.clear();
}

}

return 0;
}

Thanks,
vikas

Re: problem with _kbhit and i/o exception handling

John R. Shaw19-Oct-05 10:05

John R. Shaw

19-Oct-05 10:05

To reset kbhit() you must read the character.
if( kbhit() ) getch();
We used to have to do key debouncing like so:
while( kbhit() ) getch();

INTP
Every thing is relative...

how to add a new device and uninstall it in MFC?

V.G19-Oct-05 0:59

V.G

19-Oct-05 0:59

Are there any API's or macros that allow us to add a new device or uninstall it through our program... in MFC? Roll eyes | :rolleyes:

if not.. then how does the ADD/Remove harware wizard in control panel work? Thks

PARALLEL CONTROL

eriq19-Oct-05 0:50

eriq

19-Oct-05 0:50

Hey wsup y`all? am currently working on a university project invovling the design of a fully automated lathe machine. the hardware part and machine design is easy and done....now the only problem is designing the software to control the machine using the parallel port. the program,should have a simulation of the movement of the machine tip controled by stepper motors.any person good with 3d programming can help me a lot.halla back if your interested in the challenge of designing the software..

Re: PARALLEL CONTROL

vikas amin19-Oct-05 3:05

vikas amin

19-Oct-05 3:05

I have worked on hardware interface projects
but will like to know details of ur project
first , then only i can help.

Vikas Amin
Embin Technology
Bombay
vikas.amin@embin.com

How to map keyboard Event in a Dialogbar

Manohar B. Srikanth19-Oct-05 0:35

Manohar B. Srikanth

19-Oct-05 0:35

Dear MFCExperts,

I have a dialog bar with icon moving on it. I use OnContextMenu Message to invoke a Menu for adding the icons. Now I want the delete some of icons.These icons are stored in a array. When I press key 'D', I want one of these icons to get deleted. I tried the OnChar message. But effect is not happening. The following the body of OnChar

Any suggestions Please,

void CTBMap::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags)
{
// TODO: Add your message handler code here and/or call default

switch(nChar)
{
case VK_DELETE:
m_pMarkers->m_ItemIndex--;
InvalidateRect(NULL,TRUE);
break;
default:
break;
}
CDialogBar::OnChar(nChar, nRepCnt, nFlags);
}

Thanks in advance

-- Manohar
Research Student.
IISc, Bangalore. India
http://ssl.serc.iisc.ernet.in/~manohar/

Can Someone Explain Error Message

sweep12319-Oct-05 0:21

19-Oct-05 0:21

I get the following compile warning:-

c:\TestProg\SigData.h(3625): warning C4146: unary minus operator applied to unsigned type, result still unsigned.

I am assigning the value -2147483648 to an int field in a structure.

Thanks.

toxcct19-Oct-05 0:26

toxcct

19-Oct-05 0:26

could you show the code that's crashing please ?

TOXCCT >>> GEII power
[toxcct][VisualCalc]

sweep12319-Oct-05 0:45

19-Oct-05 0:45

Sorry its just a compiler Warning, but was trying to get rid of it.

I have a structure:-

typedef struct <br />
{<br />
	char		scaling 	[SCALE_LENGTH];<br />
	char		format 		[FORMAT_LEN];<br />
	char		dataRaw 	[DATA_LEN];<br />
	char		dataEng 	[DATA_LEN];<br />
	char		display1 	[DISPLAY_LEN];<br />
	int			base;<br />
	int			offset;<br />
	int			mask;<br />
	int			wordSize;<br />
	int			shift;<br />
	int			noFieldsBefore;<br />
	int			noFieldsAfter;<br />
	double		maximum;<br />
	double		minimum;<br />
	double		fullScale;<br />
}SIGNAL_DETAILS;<br />
<br />
And init:-<br />
<br />
// Initialise Data Structure for the Signals<br />
SIGNAL_DETAILS signal_details[NO_FIELDS]	 =	{<br />
		"1",		 // Scaling<br />
		"Integer",	 // Display Format<br />
		"0",		 // Raw Data String<br />
		"0",		 // Engineering Data String<br />
		"%04X",		 // Raw Display Format<br />
		382,		 // Signal Memory Base<br />
		0,		 // Signal Memory Offset<br />
		-2147483648,		 // Signal Mask<br />
		32,		 // Word Size<br />
		0,		 // Signal Shift<br />
		0,		 // Signal position in word - Before<br />
		3,		 // Signal position in word - After<br />
		255.000000	, // Signal Max Value<br />
		0.000000	, // Signal Min Value<br />
		255.000000	, // Signal Full Scale Value<br />
	,<br />
//	--------------------------------------------------

etc.
Its the Initialisation of mask to -2147483648 that causes the problem.

prasad_som19-Oct-05 2:11

prasad_som

19-Oct-05 2:11

why you are assigning value to an int,which falls out of its range?

toxcct19-Oct-05 2:28

toxcct

19-Oct-05 2:28

it is not out of range, it is exactly the lower bound of a 32-bits signed int :

2^32     = 4294967296
(2^32)/2 = 2147483648
 
so, signed int contains values into [-2147483648 ; +2147483647]

TOXCCT >>> GEII power
[toxcct][VisualCalc]

prasad_som19-Oct-05 2:42

prasad_som

19-Oct-05 2:42

oops ! my mistake. D'Oh! | :doh:

just careless reading.

Rage19-Oct-05 3:16

Rage

19-Oct-05 3:16

How about :

{
char scaling [SCALE_LENGTH];
char format [FORMAT_LEN];
char dataRaw [DATA_LEN];
char dataEng [DATA_LEN];
char display1 [DISPLAY_LEN];
int base;
int offset;
signed int mask;
int wordSize;
int shift;
int noFieldsBefore;
int noFieldsAfter;
double maximum;
double minimum;
double fullScale;
}SIGNAL_DETAILS;

~RaGE();

sweep12319-Oct-05 3:33

19-Oct-05 3:33

Still the same compiler warning.

toxcct19-Oct-05 3:52

toxcct

19-Oct-05 3:52

ok, i've got it... just have a look at the MSDN[^] :

Practically, this occurs when the programmer is trying to express the minimum integer value, which is -2147483648. This value cannot be written as -2147483648 because the expression is processed in two stages:

1. The number 2147483648 is evaluated. Because it is greater than the maximum integer value of 2147483647, the type of 2147483648 is not int, but unsigned int.
2. Unary minus is applied to the value, with an unsigned result, which also happens to be 2147483648.

ah, that was so simple D'Oh! | :doh:

just use INT_MIN instead of hard coding the value and don't forget to #include<limits.h>...

TOXCCT >>> GEII power
[toxcct][VisualCalc]

sweep12319-Oct-05 4:04

19-Oct-05 4:04

I tried 0x8000000 and it worked OK.

But thanks for your post.

Roger Stoltz19-Oct-05 3:47

Roger Stoltz

19-Oct-05 3:47

What compiler are you using? Are you building for Win32?

'int' is per definition signed and the range of the type is –2,147,483,648 to 2,147,483,647 in a 32-bit environment.

What happens if you change the radix of the value to hex and assign 0x80000000?
(Since this looks like a bit mask perhaps this is preferred anyway...)

--
Roger

It's supposed to be hard, otherwise anybody could do it!