C / C++ / MFC Discussion Boards

xxhimanshu9-Feb-03 18:08

9-Feb-03 18:08

hi,
I got a dll file in which one of its function process time
is about 5 seconds.
When I do iteration, the process time becomes 5 seconds x
number of iterations which makes my application very slow.
I tried to create multiple threads in my application
but it didn't have effect because those thread will
share a single thread of the dll.
According to what I've read in MSDN, all windows application
share the same dll process in memory. So if many application
use it, its process becomes slow.

My question is, Is there a way to create multiple process
of the DLL in memory? So I can use different processes of
DLL for each iteration? any pointers or any article suggestions..please..thanks in advance

Himanshu

ZOrder problems with CScrollView

DominicG9-Feb-03 17:11

DominicG

9-Feb-03 17:11

I have a small challenge I need some help with. I have a
CScrollView derived class that displays columns, and each column has a header associated with it. I want the headers to always be displayed even when the view is scrolled. Thanks in advance for your response.

Re: ZOrder problems with CScrollView

KaЯl9-Feb-03 21:25

KaЯl

9-Feb-03 21:25

A solution could be to use two views in the frame, one for the data and one for the column header.

Angels banished from heaven have no choice but to become demons
Cowboy Bebop

Is there any simple way to distribute Visual C++ 6.0 (work with DAO & MS Access 2000)

Anh Truong9-Feb-03 17:07

Anh Truong

9-Feb-03 17:07

Hi,

After reading article at http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnvc60/html/redistribvc6.asp ... I am very surprise that we have to do a lot of steps to distribute a single Visual C++ application working with MS Access & DAO

Is there any simple way to include every thing in a single CD? Here are what I have:

a) An Visual C++ 6.0 application: Trial.exe
b) A Trial.mdb that is needed for the Trial.exe (MS Access2000)

What I need more to put in the package and install them in a PC that has Window98 (or later) without having MS Access & Visual C++?

I do know one thing, if I install in that PC ---> Visual C++ only with Access Database option ... it will work! How can I do a similiar task without installing Visual C++?

Thanks for any help

Re: Is there any simple way to distribute Visual C++ 6.0 (work with DAO & MS Access 2000)

Pavel Klocek9-Feb-03 23:01

Pavel Klocek

9-Feb-03 23:01

You need MDAC and Jet 4.0 Service Pack 3 from here[^].

Pavel
Sonork 100.15206

CListCtrl not visible within nested PropertySheet

Bonnie29-Feb-03 14:35

Bonnie2

9-Feb-03 14:35

Hi All,

I have a vexing problem related to CListCtrls within nested CPropertysheets.

Very standard stuff here, the invisible CListCtrl is on CPropertyPage along with several visible CButton controls.

DWORD dwStyle = LVS_REPORT | LVS_SHOWSELALWAYS | WS_CLIPCHILDREN |
WS_CHILD | WS_VISIBLE | WS_GROUP | WS_TABSTOP | LVS_EDITLABELS ;

DWORD dwEXStyle = LVS_EX_FULLROWSELECT | LVS_EX_GRIDLINES | WS_EX_CLIENTEDGE;

It must be obvious but I cannot see it.

If there are any kind souls out there - please help

Regards In Advance

Bonnie

Bonnie2

Re: CListCtrl not visible within nested PropertySheet

Roger Allen10-Feb-03 6:27

Roger Allen

10-Feb-03 6:27

Do you have a group box on the property page as well? If you do, check the tab order as it can hide any controls under it. Try putting it before/after the control being hidden in the tab order.

Roger Allen
Sonork 100.10016

WHats brown and sticky?
A stick or some smelly stuff!

please help !! multiple document/views

Perseus9-Feb-03 12:45

Perseus

9-Feb-03 12:45

How do i add multiple document/views to an MDI app??

Is there something else that has to be done other than add additional
document/view classes and AddDocTemplate statements to the InitInstance of the mainframe?

thx
perseus

Calendar control

ROK_RShadow9-Feb-03 12:41

ROK_RShadow

9-Feb-03 12:41

I recently just started to design a tool to help me at work, it works kind of like a Hotel Reservation system. Before we used a program called "Calendar Creator" to manage all the reservations for a given day; however there are a lot of other ways we need to view the data as well. For example sometimes we need to submit reports on how many people are staying in certain buildings and percentages. So I decided to write a tool to manage all this. Everything is going good so far, but one problem.. I need this tool to be able to write all the added entries to a calendar. So I figured I would create a "Calendar View" that would display a calendar with all the added entries. However I soon found that there are no standard or popular calendar controls. So far ever Calendar controls I have seen are really just date pickers. So I figured I would write one myself, however I'm bad at math.. so the question.

1. Do I have to write one myself? (I don't want to re-invent the wheel)
2. If I do have to write it myself, how would I be able to tell that say Feb 10 2003 would be on a Monday?

Any help would be appreciated.

Thank you.

Re: Calendar control

benjymous10-Feb-03 0:39

benjymous

10-Feb-03 0:39

ROK_RShadow wrote:
1. Do I have to write one myself? (I don't want to re-invent the wheel)

I've worked with the Microsoft calendar controls and they seem to be full of lots of frustrating bugs, so I'd say you're probably better of working from scratch

ROK_RShadow wrote:
2. If I do have to write it myself, how would I be able to tell that say Feb 10 2003 would be on a Monday?

The Doomsday Algorithm[^]

http://www.codeproject.com/datetime/DoomsdayDate.asp[^]

--
Help me! I'm turning into a grapefruit!

Anyone have class similiar

Brian Shifrin9-Feb-03 11:53

Brian Shifrin

9-Feb-03 11:53

CDotNetTabCtrl ....

http://www.codeproject.com/wtl/TabbingFramework.asp

Seems like MDI tab sample:

http://www.codeproject.com/tabctrl/mditabs.asp

Just don't want to waste time converting XP UI

Complex Equations...

EnigmaticalShadow9-Feb-03 10:33

EnigmaticalShadow

9-Feb-03 10:33

Hi, is there a simple way to program complex equations in MFC AppWizard(exe)??? For the equation z = z^2 + c, where 'z' and 'c' is (r + i), I was able to program it like this:

//r2 and i2 the user gives the values for
//r and i are the 'x' and 'y' values on the complex plain
//r5 and i5 is the final 'z' value
r3 = (r2 * r2) + (-(i2 * i2));
i3 = (i2 * r2) + (i2 * r2);

r5 = r3 + r;
i5 = i3 + i;

r2 = r5;
i2 = i5;

I need the final answer in complex form (r + i) so I may be able to put those values back into the equation as 'r2' and 'i2'... I want a simpler way to do this so I can use bigger equations like:
z = ((z^5 + c)/(z^3 + z^2 + z + 1)) + sin(z)

Thanks...

Re: Complex Equations...

markkuk9-Feb-03 10:48

markkuk

9-Feb-03 10:48

Use the Standard C++ complex class.

#include <complex>
std::complex<double> z, c;
//...
z = std::pow(z, 2) + c;
//...

Re: Complex Equations...

Anonymous9-Feb-03 11:39

Anonymous

9-Feb-03 11:39

How would I get the 'r' and 'i' values from the 'z'???

Re: Complex Equations...

EnigmaticalShadow9-Feb-03 16:14

EnigmaticalShadow

9-Feb-03 16:14

How would I get the Real and Imaginary values from the 'z'???

Re: Complex Equations...

Steve Mayfield9-Feb-03 18:52

Steve Mayfield

9-Feb-03 18:52

double real, imag;
complex cplx;
T = complex(1.0, 2.0)
real = cplx.real();   /* returns the real part of cplx */
imag = cplx.imag();   /* returns the imaginary part of cplx */

Re: Complex Equations...

9-Feb-03 20:15

It gives me an error saying 'complex' is "undeclared identifier"...
What I need to do after I got 'z' is this:

Final = abs(pow(pow(z[REAL PART], 2) + pow(z[IMAGINARY PART], 2), 0.5));

'double Final' is a single value...

Thanks...

Re: Complex Equations...

markkuk10-Feb-03 2:03

markkuk

10-Feb-03 2:03

#include <complex>
using namespace std;
double final;
complex<double> z(1.0, 2.0);

// final = abs(sqrt(pow(z.real(), 2) + pow(z.imag(), 2)));
final = abs(z);

pow(x, 0.5) is the same as sqrt(x).
abs(z) where z is a complex number calculates the same value as your formula.

Re: Complex Equations...

EnigmaticalShadow10-Feb-03 6:45

EnigmaticalShadow

10-Feb-03 6:45

When I do the calculations this way:

z = (2, 3);
c = (-4, -5);
z = std::pow(z, 2) + c;
Final = abs(sqrt(pow(z.real(), 2) + pow(z.imag(), 2)));

I get a different answer than this:

r2 = 2; i2 = 3;
r = -4; i = -5;
r3 = (r2 * r2) + (-(i2 * i2));
i3 = (i2 * r2) + (i2 * r2);
r5 = r3 + r;
i5 = i3 + i;
r2 = r5;
i2 = i5;
Final = abs(pow(pow(r5, 2) + pow(i5, 2), 0.5));

The second way seems to give me the correct answer... Thanks...

Re: Complex Equations...

EnigmaticalShadow10-Feb-03 7:16

EnigmaticalShadow

10-Feb-03 7:16

Nevermind, I figured it out... I had "complex<double> z = (2, 3);" instead of "complex<double> z(2, 3);"...

Dialog Box Question

Paddy9-Feb-03 8:58

Paddy

9-Feb-03 8:58

When a modal dialog box is closed using EndDialog does it's parent window recieve a message to notify it that the dialog has closed? I want to update some info in my status bar as soon as the dialog is closed.

Thanks in advance,
Paddy

Re: Dialog Box Question

Nish Nishant9-Feb-03 9:05

Nish Nishant

9-Feb-03 9:05

If this is MFC, then DoModal returns only when EndDialog is called. If this is a non-MFC modal dialog you created by calling DialogBox, then DialogBox won't return till EndDialog is called.

Nish

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

Re: Dialog Box Question

Paddy9-Feb-03 9:55

Paddy

9-Feb-03 9:55

Thanks for the help. It's non-MFC I'm using. Does this mean that my main window can't do anything until EndDialog is called?

Paddy

Re: Dialog Box Question

Nish Nishant9-Feb-03 12:21

Nish Nishant

9-Feb-03 12:21

Paddy wrote:
It's non-MFC I'm using. Does this mean that my main window can't do anything until EndDialog is called?

Yup, your main window will be frozen. An alternative is to use a modeless dialog, or use threads.

Nish

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

crash with push_back for vector

nss9-Feb-03 7:58

nss

9-Feb-03 7:58

What am I doing wrong? I want to read the names from a file and put them onto a vector of char*......it crashes at the pushback. Each file name is on a different line.

I did a dir/b in dos and got a txt file with a list of file names (a bunch of .bmps) from the directory. I assume theres carriage returns at the end of each line. But maybe not. There are 18 letters in the name08FEB096_9571s.bmp, and carriage return line feed is 1 byte (MSDN).

CFile file;

std::vector<char*> fileVec;

file.Open("c:\\miss\\SImages.txt", CFile::modeRead, 0);

char* pBuf;

char folder[200];

strcpy(folder , "C:\\miss\\");

for (int i = 0; i <96; i++)
{

    pBuf = new char[200];

    file.Read( pBuf,20);

    strcat(folder, pBuf);

    fileVec.push_back(folder);

    delete[] pBuf;
}


file.Close();

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