C / C++ / MFC Discussion Boards

Re: Modification of xls file

ForNow18-May-15 7:43

ForNow

18-May-15 7:43

I think courier new all the characters are the same width I'll read the doc

Thanks

Application crash when reading file from mapped network drive is discoonected

shanmugarajaa17-May-15 23:35

shanmugarajaa

17-May-15 23:35

Hi friends,

case 1:
I am opening a file from network drive location. During file read, the mapped network drive is disconnected, my application get crashed and closed. how to check the mapped network drive is connected or not using file pointer.

case 2: during file read, I am disconnecting and connecting the mapped network drive that time pointer is not null. but I cant able to access a file using this file pointer.

Thanks,
S Shanmuga Raja

Re: Application crash when reading file from mapped network drive is discoonected

Richard MacCutchan17-May-15 23:44

Richard MacCutchan

17-May-15 23:44

You should use a try/catch block to catch exceptions that occur in such circumstances, and/or check the status of any file access calls.

Re: Application crash when reading file from mapped network drive is discoonected

achal375418-May-15 21:57

achal3754

18-May-15 21:57

1. You should handle the exception.
2. You can write a method to check connection (through ping).

Re: Application crash when reading file from mapped network drive is discoonected

Ashish Tyagi 402-Jun-15 21:47

Ashish Tyagi 40

2-Jun-15 21:47

If you share which API you are using for file I/O then you'd get answer more accurately.
Did you used std::fstream or some other API?

sort million input

Sohail Sowell17-May-15 20:34

Sohail Sowell

17-May-15 20:34

I want a code of c code
which can take million integers as input,
sort them (bubble or quick or selection sort).
It should display time taken to sort first 10 integer, then for first 100 integer, then for 10000 and total.
Please help me soon I have very less time to complete my project.
iamsohail.srk@gmail.com

Re: sort million input

Richard MacCutchan17-May-15 23:42

Richard MacCutchan

17-May-15 23:42

Sorry, CodeProject does not provide code to order, especially for homework questions.

Re: sort million input

enhzflep18-May-15 2:40

enhzflep

18-May-15 2:40

Well then, you'd better hop-to-it and get writing then don't you?
There's countless examples of sorting code on the web. If you cant even be bothered to search for them, and instead ask to be spoon-fed,you're not going to enjoy programming much - it's an occupation that required copious amounts of research.

Also, you might wish to edit your question to remove your email address - you'll get email notifications if someone replies anyway - providing your email just provides opportunity for others to inconvenience you. D'Oh! | :doh:

"When I was 5 years old, my mother always told me that happiness was the key to life. When I went to school, they asked me what I wanted to be when I grew up. I wrote down 'happy'. They told me I didn't understand the assignment, and I told them they didn't understand life." - John Lennon

Drive Start Sector using WMI services

john563215-May-15 20:39

john5632

15-May-15 20:39

Hello,

I am trying to get all available logical drive information using WMI services. If a partition is under extended partition, I am getting wrong startingOffset although getting correct startingoffset in case non extended partition.

Please suggest....

Re: Drive Start Sector using WMI services

Frankie-C17-May-15 0:46

Frankie-C

17-May-15 0:46

In the extended partitions the meaning of partition table entries are different from that of standard partitions.
You may want have a look to this[^] MS article.

DialogBox Create Fails

ForNow15-May-15 5:33

ForNow

15-May-15 5:33

Hi
My code for Create (of a dialog box fails) in MFC base code specifically the line in bold
when I try to Create for a DialogBox

I have DECLARE_DYNAMIC and IMPLEMENT_DYNAMIC in the respective sources though I don't think that is a issue one way or a other

Don't know why

C++

main_app->myshow_storageptr = new Show_storage();
 main_app->myshow_storageptr->AssertValid();
 main_app->myshow_storageptr->Create(IDD_DIALOG6,NULL);

MFC code from wincore

C++

void AFXAPI AfxHookWindowCreate(CWnd* pWnd)
{
    _AFX_THREAD_STATE* pThreadState = _afxThreadState.GetData();
    if (pThreadState->m_pWndInit == pWnd)
        return;

<pre>
if (pThreadState-&gt;m_hHookOldCbtFilter == NULL)
{
    pThreadState-&gt;m_hHookOldCbtFilter = ::SetWindowsHookEx(WH_CBT,
        _AfxCbtFilterHook, NULL, ::GetCurrentThreadId());
    if (pThreadState-&gt;m_hHookOldCbtFilter == NULL)
        AfxThrowMemoryException();
}
ASSERT(pThreadState-&gt;m_hHookOldCbtFilter != NULL);
ASSERT(pWnd != NULL);

ASSERT(pWnd->m_hWnd == NULL); // only do once

ASSERT(pThreadState->m_pWndInit == NULL); // hook not already in progress
pThreadState->m_pWndInit = pWnd;

Re: DialogBox Create Fails

David Crow15-May-15 6:01

David Crow

15-May-15 6:01

What type of object is Show_storage?

What does Create() return?

Where is your code called from, or what is it in response to?

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles

modified 15-May-15 15:59pm.

Re: DialogBox Create Fails

ForNow15-May-15 6:15

ForNow

15-May-15 6:15

A CDialog

Create never return it aborts causes an an exception

In the assert highlighted in bold

Re: DialogBox Create Fails

Richard MacCutchan15-May-15 22:25

Richard MacCutchan

15-May-15 22:25

The assert fails because the CWnd* does not point to an object that contains a valid Window handle. Something in your code has not been initiailised correctly, or you are calling Create from outside of a Window class. What class is Show_storage?

Property Grid alignment issue with sub-group

Maximilien15-May-15 4:16

Maximilien

15-May-15 4:16

I am creating a simple property grid (CMFCPropertyGridCtrl) containing sub groups (value list)

There is a alignment issue for the sub groups where the labels are drawn with a left offset (see in particular the "Level2" label)

Why is the "Level2" label not aligned the same was as the "Level1" label?
I would imagine that it should be aligned at the same level as the "subLevel1" label.

See screenshot : http://imgur.com/9JeC4iz

Here is how I code the property grid:

CMFCPropertyGridProperty* level1Group = new CMFCPropertyGridProperty(_T("Level1"), 0, TRUE );
CMFCPropertyGridProperty* subLevel1 = new CMFCPropertyGridProperty(_T("subLevel1"), _T("subLevel1"), _T("subLevel1") );
level1Group->AddSubItem(subLevel1);

CMFCPropertyGridProperty* level2Group = new CMFCPropertyGridProperty(_T("Level2"), 0, TRUE );
CMFCPropertyGridProperty* subLevel21 = new CMFCPropertyGridProperty(_T("SubLevel2.1"), _T("SubLevel2.1"), _T("SubLevel2.1") );
CMFCPropertyGridProperty* subLevel22= new CMFCPropertyGridProperty(_T("SubLevel2.2"), _T("SubLevel2.2"), _T("SubLevel2.2") );
CMFCPropertyGridProperty* subLevel23 = new CMFCPropertyGridProperty(_T("SubLevel2.3"), _T("SubLevel2.3"), _T("SubLevel2.3") );

level2Group->AddSubItem(subLevel21);
level2Group->AddSubItem(subLevel22);
level2Group->AddSubItem(subLevel23);
level1Group->AddSubItem(level2Group);
m_PropertyGrid.AddProperty(level1Group);

I tried inheriting my own CMFCPropertyGridProperty class and overwrite the OnDrawName but because of many protected members in the base class. (see CMFCPropertyGridProperty::OnDrawName in afxpropertygridctrl.cpp )

Now, I did overwrite the OnDrawName method, but removed lot of code that was in the base method that did not compile (access to protected members); but it seems to be OK.

Thanks.

Max.

I'd rather be phishing!

An analog switch, but more efficient

Vladimi_r215-May-15 4:15

Vladimi_r2

15-May-15 4:15

As is well known when using switch (expression), thus:
"The expression must be of an integral type or of a class type for which there is an unambiguous conversion to integral type".
If the switch contains a number of case / 2 to 4 /, then there is no problem.
Well, if you say case is 30 pieces, then dostura to 29 in a row case, the compiler must make 29 comparisons.
Below is a one of the solutions to this problem.

And so the program as expression must transmit the index number to any array, containing the address points
transition operator goto.
Everything!

Notes: Of course array must contain the called function.

modified 15-May-15 11:09am.

Re: An analog switch, but more efficient

jeron115-May-15 5:06

jeron1

15-May-15 5:06

Have a gander here[^]. Pay particular attention to #11.

"the debugger doesn't tell me anything because this code compiles just fine" - random QA comment
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Calculating average in a high priority thread

Member 935023714-May-15 23:18

Member 9350237

14-May-15 23:18

Hi Guys!,

I'm developing a simple tracking game using two haptic devices as controllers.
Haptic rendering is executed in a high priority thread.
During the experiment, force experienced will depends on the position of each player, it's calculated as follows:

C++

coupledForce1 = cMul(Kp, (newPosition2-newPosition1))-(cMul(Kb, (linearVelocity1)));

C++

coupledForce2 = cMul(Kp, (newPosition1-newPosition2))-(cMul(Kb, (linearVelocity2)));

I have 100 trials of tracking tasks and I have to calculate the average interaction force during each trial. How it can be done? my issue is: this manipulation have to be done in a thread with execution rate of around 8KHz

Thanks!

Re: Calculating average in a high priority thread

Jochen Arndt14-May-15 23:27

Jochen Arndt

14-May-15 23:27

Please don't repost questions. You have already asked this here Calculating average in a thread[^].

Re: Calculating average in a high priority thread

Member 935023714-May-15 23:36

Member 9350237

14-May-15 23:36

my bad!, just removed

Re: Calculating average in a high priority thread

Jochen Arndt14-May-15 23:42

Jochen Arndt

14-May-15 23:42

Thank you. The problem with duplicate questions is that you may get answers from different users to both questions.

A clarification question to yours: Do you need code to calculate the average?
If so, you may search for "moving average" or "rolling average".

Re: Calculating average in a high priority thread

Member 935023715-May-15 0:19

Member 9350237

15-May-15 0:19

Thank you!. I have already seen some implementation of moving average. But I'm not sure about how to implement for my application. Since it's in a thread which is executing at 8Khz, I'm wondering how to store forces trial by trial and to take avareage?

Re: Calculating average in a high priority thread

Jochen Arndt15-May-15 0:53

Jochen Arndt

15-May-15 0:53

See this Stackoverflow thread: http://stackoverflow.com/questions/10990618/calculate-rolling-moving-average-in-c-or-c[^].

The fastest solution would be a ring buffer and a total sum variable (untested):

C++

int items = 0;
int ndx = 0;
int buffer[buffer_Size];
// May need floating point here when max. value * buffer_size >= INT_MAX
int sum = 0;

int get_av(int val)
{
    if (items >= buffer_size)
        sum -= buffer[ndx];
    else
        ++items;
    sum += val;
    buffer[ndx] = val;
    if (++ndx >= buffer_size)
        ndx = 0;
    return sum / items;
}

This should be fast enough for your requirements

Exception in code C

Member 1169244814-May-15 21:33

Member 11692448

14-May-15 21:33

Hello,
This is my code.
When i compile and execute it i have the following error:

1 [main] test 5952 exception::handle: Exception: STATUS_ACCESS_VIOLATION
    722 [main] test 5952 open_stackdumpfile: Dumping stack trace to test.exe.sta
ckdump

C++

#include <stdio.h>
#include<stdlib.h>
#include<string.h>

typedef struct Date{
int J ;
int M ;
int A ;
} Date;

typedef struct Operation{
char Obj[30];
float Mnt ;
Date Date_Tr ;
int Type_Tr ;
int Etat ;
} Operation;

typedef struct Cellule{
Operation Info ;
struct Cellule *succ ;
} Cellule ;

typedef Cellule * Liste ;

int EgaliteDates(Date d1 , Date d2)
{
    if ((d1.J==d2.J) && (d1.M==d2.M) && (d1.A==d2.A))
    return 0;
    else
    {
        if ((d1.A>d2.A) || ((d1.A==d2.A) && (d1.M>d2.M)) || (((d1.A==d2.A) && (d1.M==d2.A) && (d1.J==d2.J))))
            return 1;
        else
            return 2;
             }
}
Liste InsertionOperation(Liste L , Operation op)
{

		Liste temp;
		Liste pred;
		Liste element;
 		element = malloc(sizeof(Liste));
    	element->Info = op;
    	element->succ = NULL;

    	if(L == NULL)
    	{
			L=element;
    	}
    	else
    	{
        	if (EgaliteDates(L->Info.Date_Tr,op.Date_Tr)==2)
        	{
        		element->succ= L;
        		L=element;
			}
			else
			{
			temp=L;
			pred=L;
        	while((temp->succ != NULL) && (EgaliteDates(temp->Info.Date_Tr,op.Date_Tr)<2))
        	{
        		pred=temp;
            	temp = temp->succ;
        	}
        	element->succ=temp->succ;
        	pred->succ = element;

        	}
    	}
    	return L;
}

void afficherListe(Liste L)
{
    Cellule *tmp = L;
    int i=0;
    while(tmp != NULL)
    {
        i++;
        printf("Objet %d : %s, montant: %f, date : %d %d %d, type: %s\n", i,tmp->Info.Obj,tmp->Info.Mnt,tmp->Info.Date_Tr.J,tmp->Info.Date_Tr.M,tmp->Info.Date_Tr.M,tmp->Info.Type_Tr,tmp->Info.Etat);
        tmp = tmp->succ;
    }
}

void RechercheDate(Liste L, Date minDate , Date maxDate )
{
Cellule *tmp = L;
printf("liste des objets entre %d/%d/%d et %d/%d/%d: \n",minDate.J,minDate.M,minDate.A,maxDate.J,maxDate.M,maxDate.A);
    while(tmp != NULL)
    {
        if ((EgaliteDates(tmp->Info.Date_Tr , maxDate)<2) && (EgaliteDates(minDate,tmp->Info.Date_Tr)<2))
        printf("Objet : %s, montant: %f, date : %d %d %d, type: %s\n",tmp->Info.Obj,tmp->Info.Mnt,tmp->Info.Date_Tr.J,tmp->Info.Date_Tr.M,tmp->Info.Date_Tr.M,tmp->Info.Type_Tr,tmp->Info.Etat);
        tmp = tmp->succ;
    }
}

void ReglerOp(Liste en_cours , Liste reglee, char obj_op[])
{
Cellule *tmp = en_cours;
Cellule *pred = en_cours;
    while((tmp != NULL) && (strcmp(en_cours->Info.Obj,obj_op) != 0))
    {
        pred=tmp;
        tmp = tmp->succ;
    }
    if (tmp==en_cours)
    en_cours=en_cours->succ;
    else
        pred->succ=tmp->succ;
    tmp->Info.Etat=1;
    InsertionOperation(reglee , tmp->Info);
    free(tmp);
}

main()
{
    Date d1 = {2,10,2012};
    Date d2 = {2,12,2012};
    Date d3 = {12,10,2012};
    Date d4 = {10,12,2011};
    Date d5 = {2,10,2012};
    Date d6 = {2,10,2012};
    printf("Comapraison %d/%d/%d et %d/%d/%d donne %d\n",d1.J,d1.M,d1.A,d2.J,d2.M,d2.A,EgaliteDates(d1 , d2));
    printf("Comapraison %d/%d/%d et %d/%d/%d donne %d\n",d3.J,d3.M,d3.A,d4.J,d4.M,d4.A,EgaliteDates(d3 , d4));
    printf("Comapraison %d/%d/%d et %d/%d/%d donne %d\n",d5.J,d5.M,d5.A,d6.J,d6.M,d6.A,EgaliteDates(d5 , d6));
    Liste L;
    Operation op1= {"objet1",23.5,{30,3,2012},1,1};
    Operation op2= {"objet2",24.5,{2,2,2012},1,1};
    Operation op3= {"objet3",25.5,{12,4,2013},1,1};
    Operation op4= {"objet4",26.5,{15,10,2014},1,1};
    Operation op5= {"objet5",27.5,{9,8,2014},1,1};
    Operation op6= {"objet6",28.5,{10,11,2015},1,1};
    L=InsertionOperation(L , op1);
    L=InsertionOperation(L , op2);
    L=InsertionOperation(L , op3);
    L=InsertionOperation(L , op4);
    L=InsertionOperation(L , op5);
    L=InsertionOperation(L , op6);
    printf("\n liste réglée \n");
    afficherListe(L);
    Date dmin = {1,1,2014};
    Date dmax = {30,12,2015};
    RechercheDate(L,dmin,dmax);
    Liste en_cours;
    Operation ec1= {"ec1",20.5,{7,2,2012},2,0};
    Operation ec2= {"ec2",33.5,{30,3,2010},2,0};
    Operation ec3= {"ec3",43.5,{9,12,2014},2,0};
    Operation ec4= {"ec4",53.5,{10,10,2013},2,0};
    L=InsertionOperation(en_cours , ec1);
    L=InsertionOperation(en_cours, ec2);
    L=InsertionOperation(en_cours , ec3);
    L=InsertionOperation(en_cours , ec4);
    printf("\n liste en cours \n");
    afficherListe(en_cours);
    ReglerOp(en_cours , L, "ec4");
    ReglerOp(en_cours , L, "ec1");
    printf("\n liste réglée \n");
    afficherListe(L);
    printf("\n liste en cours \n");
    afficherListe(en_cours);

}

So what is wrong with my code and how can i fix it?
Thanks.

Re: Exception in code C

Richard MacCutchan14-May-15 22:35

Richard MacCutchan

14-May-15 22:35

You will need to use your debugger to find where the exception occurs, and update the question with that information.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.