Re: Problem with retrieveing number of characters in a multiline edit control - C / C++ / MFC Discussion Boards

How to write the program to solve the formula 2n*(2n-1)............1 in c++ urgently

Neha V11-Dec-08 22:11

Neha V

11-Dec-08 22:11

How to write the program to solve the formula 2n*(2n-1)............1 in c++

neha

modified on Friday, December 12, 2008 4:17 AM

Re: How to write the program to solve the formula 2n*(2n-1)............1 in c++ urgently

CPallini11-Dec-08 22:22

CPallini

11-Dec-08 22:22

There are (at least) two ways:

use a loop.
use recursion.

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: How to write the program to solve the formula 2n*(2n-1)............1 in c++ urgently

Manish K. Agarwal11-Dec-08 22:25

Manish K. Agarwal

11-Dec-08 22:25

long result = 1;

for (int i = 2 * n; i > 1; --i) {
result = result * i;
}

Manish Agarwal
manish.k.agarwal @ gmail DOT com

Re: How to write the program to solve the formula 2n*(2n-1)............1 in c++ urgently

Rick York11-Dec-08 22:42

Rick York

11-Dec-08 22:42

Please do not do peoples homework for them.

If you want to be helpful then it would be better to send them some links to searches at google so that the OP can find the answer for themself.

I would but I never ever answer "urgent" questions. Roll eyes | :rolleyes:

Enumerating COM port

bhanu_850911-Dec-08 22:04

bhanu_8509

11-Dec-08 22:04

Dear All,

I am having a USB serial device and I want to create handle to the device whenever the device is connected.

I want to open the handle using VID and PID of the USB serial device. I tried using SetupDi calls but not detecting the ports. The below is my code snippet. Please help me to solve this issue.

//GUID is DEFINE_GUID(GUID_DEVINTERFACE_COMPORT, 0x4d36e978, 0xe325, 0x11ce, 0xbf, 0xc1, 0x08, 0x00, 0x2b, 0xe1, 0x03, 0x18);
     bool status = false;
 bool bRet = false;
 HDEVINFO devInfoSet = INVALID_HANDLE_VALUE;
 SP_DEVICE_INTERFACE_DATA pDeviceData;
 SP_DEVINFO_DATA devInfoData;
 devInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
 DWORD index = 0;
 ULONG i=0;
 ULONG requiredLength=0;
 pDeviceData.cbSize = sizeof(SP_INTERFACE_DEVICE_DATA);
 devInfoSet =SetupDiGetClassDevs(&GUID_DEVINTERFACE_COMPORT,NULL,NULL,(DIGCF_PRESENT | DIGCF_DEVICEINTERFACE) );
 if(devInfoSet!=INVALID_HANDLE_VALUE)
 {
 while(TRUE)
 {
     bRet = SetupDiEnumDeviceInterfaces(devInfoSet, /* HDEVINFO DeviceInfoSet */NULL, /* PSP_DEVINFO_DATA DeviceInfoData */
                 &GUID_DEVINTERFACE_COMPORT, /* CONST GUID * InterfaceClassGuid */index,
             &pDeviceData /* PSP_DEVICE_INTERFACE_DATA DeviceInterfaceData */);
     int x = GetLastError();
     if(bRet)
         index++;
     else
         break;// finally the index is zero only
 }

 }

Problem with retrieveing number of characters in a multiline edit control

gabbana11-Dec-08 22:00

gabbana

11-Dec-08 22:00

Hi,

I have some problems with the edit control. I want to count the chars if it, but the message i send to the control only receives the right character num for the first line.

For exmaple. The first line can have 60 chars. If I only enter 50 or so, the message gives me the right count. If I then enter a longer text, so that the first line have all the 60 chars and the second line have only 30 chars, then the message returns also a number of 60 chars for the second line, but why ? Where is the problem ?

My line:

dwChars = (DWORD)SendDlgItemMessage(hwnd,IDC_INPUT,EM_LINELENGTH,(WPARAM)3,(LPARAM)0);

I hardcoded the line 3 here, normally I am going through a for loop.

Re: Problem with retrieveing number of characters in a multiline edit control

gabbana11-Dec-08 22:11

gabbana

11-Dec-08 22:11

Okay i found the error. I think the wparam needs the offset of the char in the complete edit field. So I first sent the EM_LINEINDEX message and now I thinks its working.

Re: Problem with retrieveing number of characters in a multiline edit control

CPallini11-Dec-08 22:19

CPallini

11-Dec-08 22:19

EM_LINELENGTH message wants the index of a character (of the wanted line) as WPARAM, hence, if you need the lenght of the third line, use:

INT iCharIndex = SendDlgItemMessage(hwnd,IDC_INPUT,EM_LINEINDEX,(WPARAM)2,(LPARAM)0);
INT iLineLen = SendDlgItemMessage(hwnd,IDC_INPUT,EM_LINELENGTH,(WPARAM)iCharIndex,(LPARAM)0);

Short cut help

Davitor11-Dec-08 21:18

Davitor

11-Dec-08 21:18

Hi All

How can i use short cut key for open and close dialog box?Plz help me

Re: Short cut help

Jijo.Raj11-Dec-08 21:26

Jijo.Raj

11-Dec-08 21:26

You mean a Global Hot Key[^] for your dialog application? Or just application specific Keyboard accelerator shortcut[^]? For both cases, check the provided links. Wink | ;)

Regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

Split Form view

kiranin11-Dec-08 20:37

kiranin

11-Dec-08 20:37

Normally and SDI an application mainframe can split using splitterWnd from CMainFrame,

Can i split the new fromview in the same application which is not the main view

Re: Split Form view

Nishad S11-Dec-08 23:03

Nishad S

11-Dec-08 23:03

Cant you code it explicitly using a static splitter?

- NS -
[ODBaseBtn]

Compare input date with current date!

krajah1011-Dec-08 20:06

krajah10

11-Dec-08 20:06

Hi' I'm new to C++?
This code to show current date.

#include <iostream.h>
#include "string.h"
#include "time.h"
#include <stdlib.h>
int main()
{

tdclass TimeDateClass;

cout<<"Today is "<<TimeDateClass.date()<<endl;

system("pause");

}

How to compare date we input and compare is it less or more from the current date?
Tq

Re: Compare input date with current date!

Nishad S11-Dec-08 21:03

Nishad S

11-Dec-08 21:03

One idea is to convert the dates to corresponding number of days and compare.

- NS -
[ODBaseBtn]

Re: Compare input date with current date!

krajah1011-Dec-08 21:31

krajah10

11-Dec-08 21:31

Can you show me more details!

Re: Compare input date with current date!

Nishad S11-Dec-08 21:49

Nishad S

11-Dec-08 21:49

For example,

days1 = day1 + month1*31 + year1*365;
days2 = day2 + month2*31 + year2*365;

if( days1 > days2 )
{
do something
}
else
{
do something
}

- NS -
[ODBaseBtn]

Re: Compare input date with current date!

Jijo.Raj11-Dec-08 21:19

Jijo.Raj

11-Dec-08 21:19

You can use COleDateTime[^] class. It have comparison operators such as ==, <, <=, etc[^] which can be used for comparison.

Regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

Single instance of application

Hungry Developer11-Dec-08 19:15

Hungry Developer

11-Dec-08 19:15

Hi,
Using synchronization object, I can restrict the number of instances of my application to one. How can I achieve the same, when the system is on network?

Re: Single instance of application

Jijo.Raj11-Dec-08 19:56

Jijo.Raj

11-Dec-08 19:56

What about broadcasting a custom UDP message over the network? If any of your application is running over somewhere in the network, sent back another reply.

Regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

Re: Single instance of application [modified]

Malli_S11-Dec-08 20:31

Malli_S

11-Dec-08 20:31

What exactly do you mean by system is on network ?

-Malli...!

modified on Friday, December 12, 2008 2:38 AM

Re: Single instance of application

Stuart Dootson11-Dec-08 21:29

Stuart Dootson

11-Dec-08 21:29

Hmmm - is it possible that you want to achieve this so you can ensure there's only one person accessing a resource on the network somewhere? If it's a file, you could try locking the file appropriately...or you could do the job the safe and assurable way, and hide the resource behind a server, so the server is the only thing that can access it, giving you control again.

Debugging Services on Vista(UAC Off)- Visual Studio 2005 "Attach to Process"

NiceNaidu11-Dec-08 19:05

NiceNaidu

11-Dec-08 19:05

Hi Friends,

I have two NT services running on my machine.NTService1 is dependent on NTService2.
When i was trying to debug the code related to NTService2,i tried attach to process. But the process related to NTService2 is always grayed out.
This is happening only on Vista machine.
I tried searching the Microsoft forums,but could not find a solution.
Any help is appreciated.

Thanks in Advance.

Appu..
"Never explain yourself to anyone.
Because the person who likes you does n't need it.
And the person who dislikes you won't believe it."

Re: Debugging Services on Vista(UAC Off)- Visual Studio 2005 "Attach to Process"

Mark Salsbery12-Dec-08 6:52

Mark Salsbery

12-Dec-08 6:52

Visual Studio needs to run with elevated privileges to attach to processes...
Are you doing that?

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Debugging Services on Vista(UAC Off)- Visual Studio 2005 "Attach to Process"

NiceNaidu18-Dec-08 2:01

NiceNaidu

18-Dec-08 2:01

Yes..I am doing that.

Appu..
"Never explain yourself to anyone.
Because the person who likes you does n't need it.
And the person who dislikes you won't believe it."

Add Checkbox or button in header of List Ctrl?

Le@rner11-Dec-08 18:30

Le@rner

11-Dec-08 18:30

Hi all,

I m using a ListCtrl of ReportView type.

i have 5 coloumns here.

i want to add checkbox or button in header or in coloumn 4.

please tell me how can i do this.

thanks in advance.

IN A DAY, WHEN YOU DON'T COME ACROSS ANY PROBLEMS - YOU CAN BE SURE THAT YOU ARE TRAVELLING IN A WRONG PATH

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