Re: how to delete cstring from specific index - C / C++ / MFC Discussion Boards

Aljaz11112-Apr-09 9:59

12-Apr-09 9:59

so i have to break cstring to single elements and then every element convert to binary.. at the end..i have to put them back together..hmm..ok..i will try..

problem about cvcamshift

onlybluemoon12-Apr-09 5:38

onlybluemoon

12-Apr-09 5:38

hi
The orientation (θ) of the major axis and the scale of the distribution are determined by finding an equivalent rectangle that has the same moments as those measured from the 2D probability distribution image.But I can not understand clearly.
which algorithm cvcamshift choose?
thank you.

CV_CALL( cvMoments( &cur_win, &moments ));

m00 = moments.m00;
m10 = moments.m10;
m01 = moments.m01;
mu11 = moments.mu11;
mu20 = moments.mu20;
mu02 = moments.mu02;

if( fabs(m00) < DBL_EPSILON )
EXIT;

inv_m00 = 1. / m00;
xc = cvRound( m10 * inv_m00 + windowIn.x );//新计算出来的中心
yc = cvRound( m01 * inv_m00 + windowIn.y );
a = mu20 * inv_m00;//（x-x的中心）的平方*概率/总概率
b = mu11 * inv_m00;//（x-x的中心）（y-y的中心）*概率/总概率
c = mu02 * inv_m00;//（y-y的中心）的平方*概率/总概率

/* Calculating width & height */
square = sqrt( 4 * b * b + (a - c) * (a - c) );

/* Calculating orientation */
theta = atan2( 2 * b, a - c + square );

/*

原型：extern float atan2(float y, float x);

用法：#include <math.h>

功能：求y/x（弧度表示）的反正切值

说明：值域为(-π/2，+π/2)。

*/

/* Calculating width & length of figure */
cs = cos( theta );
sn = sin( theta );

rotate_a = cs * cs * mu20 + 2 * cs * sn * mu11 + sn * sn * mu02;
rotate_c = sn * sn * mu20 - 2 * cs * sn * mu11 + cs * cs * mu02;
length = sqrt( rotate_a * inv_m00 ) * 4;
width = sqrt( rotate_c * inv_m00 ) * 4;

how to delete cstring from specific index

Aljaz11112-Apr-09 3:09

Aljaz111

12-Apr-09 3:09

I have problems with deleting cstring..for example i have number 5,432 now i want to delete 2 and 3.. so result would be 5,4...how should i do it??

Re: how to delete cstring from specific index

Hamid_RT12-Apr-09 5:06

Hamid_RT

12-Apr-09 5:06

You can use of CString:Find and then use of CString:Delete.Is this your question?

Of one Essence is the human race
thus has Creation put the base
One Limb impacted is sufficient
For all Others to feel the Mace
(Saadi )

Re: how to delete cstring from specific index

Aljaz11112-Apr-09 7:34

Aljaz111

12-Apr-09 7:34

lets say i have button backspace..now user is typing numbers in cedit box..when he presses backspace button it deletes just last index of string..it would always delete just last when button pressed..

Re: how to delete cstring from specific index

Larry Mills Sr12-Apr-09 9:48

Larry Mills Sr

12-Apr-09 9:48

CString str
CEdit* pEdit1 = (CEdit*) GetDlgItem(IDC_ISENTERYDATA);// editbox ID is IDC_ISENTERYDATA
pEdit1->GetWindowTextA(str);
int t = str.GetLength();
// to delete last character:
str[(t-1)] = "";

A C++ programming language novice, but striving to learn

Re: how to delete cstring from specific index

Aljaz11112-Apr-09 10:00

Aljaz111

12-Apr-09 10:00

dude i tryed like this before i even wrote here..sorry..didn't work for me..thx anyway..

Re: how to delete cstring from specific index

Aljaz11112-Apr-09 10:04

Aljaz111

12-Apr-09 10:04

      CString str2;<br />
            int brisi;<br />
<br />
    str2.Format(_T("%f"), skupno);<br />
    brisi=str2.GetLength();<br />
    <br />
    str2[(brisi-1)]="";<br />

and error.. error C2440: '=' : cannot convert from 'const char [1]' to 'wchar_t'

Re: how to delete cstring from specific index

«_Superman_»12-Apr-09 18:40

«_Superman_»

12-Apr-09 18:40

Do this.
str2[(brisi-1)] = _T("");

«_Superman_»
I love work. It gives me something to do between weekends.

Re: how to delete cstring from specific index

David Crow13-Apr-09 3:44

David Crow

13-Apr-09 3:44

Have you tried:

CString str = "5,432";
int nLen = str.GetLength();
strr = str.Left(nLen - 1);

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"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

Too FEW Arguments in BOOL?

rbwest8611-Apr-09 21:56

rbwest86

11-Apr-09 21:56

Ok, heres what should happen. The program should return the value's of the access token of the current user. What is wrong with this picture?

I believe I need to relate SetPrivilege to a string. So later on I can use cout SetPrivilege()

I am setting up a GUEST account on my laptop, then running my program to retrieve the access token, so we can view the relate ACE's within the DACL. The point is to retrieve the limited access and display it on the screen. So I can then change it; getting familiar with ACE's, DACL's, and SACL's.

The error I get when compiling this source is that BOOL has to Few arguments. So BOOL does not have enough supplied telling it what to do, correct?

Thank you all in advance!

V/R

Rob & Big

#include <iostream><br />
#include <string><br />
#include <windows.h><br />
#include <stdio.h><br />
using namespace std;<br />
<br />
<br />
BOOL SetPrivilege(<br />
    HANDLE hToken,          // access token handle<br />
    LPCTSTR lpszPrivilege,  // name of privilege to enable/disable<br />
    BOOL bEnablePrivilege   // to enable or disable privilege<br />
    ) <br />
{<br />
	TOKEN_PRIVILEGES tp;<br />
	LUID luid;<br />
<br />
	if ( !LookupPrivilegeValue( <br />
			NULL,            // lookup privilege on local system<br />
			lpszPrivilege,   // privilege to lookup <br />
			&luid ) )        // receives LUID of privilege<br />
	{<br />
		printf("LookupPrivilegeValue error: %u\n", GetLastError() ); <br />
		return FALSE; <br />
	}<br />
<br />
	tp.PrivilegeCount = 1;<br />
	tp.Privileges[0].Luid = luid;<br />
	if (bEnablePrivilege)<br />
		tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;<br />
	else<br />
		tp.Privileges[0].Attributes = 0;<br />
<br />
	// Enable the privilege or disable all privileges.<br />
<br />
	if ( !AdjustTokenPrivileges(<br />
		   hToken, <br />
		   FALSE, <br />
		   &tp, <br />
		   sizeof(TOKEN_PRIVILEGES), <br />
		   (PTOKEN_PRIVILEGES) NULL, <br />
		   (PDWORD) NULL) )<br />
	{ <br />
		  printf("AdjustTokenPrivileges error: %u\n", GetLastError() ); <br />
		  return FALSE; <br />
	} <br />
<br />
	if (GetLastError() == ERROR_NOT_ALL_ASSIGNED)<br />
<br />
	{<br />
		  printf("The token does not have the specified privilege. \n");<br />
		  return FALSE;<br />
	} <br />
<br />
	return TRUE;<br />
}<br />
<br />
// Retrieve Local Computer Name<br />
string GetLocalComputerName()<br />
{<br />
   TCHAR chrComputerName[MAX_COMPUTERNAME_LENGTH + 1];<br />
   string strRetVal;<br />
   DWORD dwBufferSize = MAX_COMPUTERNAME_LENGTH + 1;<br />
   <br />
   if(GetComputerName(chrComputerName,&dwBufferSize)) {<br />
      strRetVal = chrComputerName;<br />
   } else {<br />
      strRetVal = "";<br />
   }<br />
   <br />
   return(strRetVal);<br />
}<br />
<br />
<br />
int main()<br />
{<br />
   system("CLS");<br />
   string password;<br />
   cout << "password: ";<br />
   cin >> password;<br />
   <br />
   if (password == "123"){<br />
      system("CLS");  //Cleares the screen<br />
      cout << "password accepted" << endl;}<br />
   <br />
   else{<br />
      cout << "password incorrect" << endl;<br />
      goto exit;}<br />
exit:<br />
      <br />
      system("CLS");<br />
      system("TITLE Local Computer Name");<br />
<br />
      // Print local computer name.<br />
      cout << GetLocalComputerName() << endl;<br />
      cout << SetPrivilege();<br />
std::cin.ignore( std::numeric_limits<std::streamsize>::max(), '\y' ); <br />
      return 0;<br />
}

Re: Too FEW Arguments in BOOL?

David Crow13-Apr-09 3:41

David Crow

13-Apr-09 3:41

rbwest86 wrote:
The error I get when compiling this source is that BOOL has to Few arguments. So BOOL does not have enough supplied telling it what to do, correct?

For starters, remove all of the code except that which is in error. Folks are not going to bother to wade through all of that when most of it is irrelevant. What was the exact error message?

Re: Too FEW Arguments in BOOL?

rbwest8614-Apr-09 1:59

rbwest86

14-Apr-09 1:59

I am sorry for the confusion. Here is the code which needs clarification. I am trying to figure out how to relay the BOOL Function to a string, so I can then cout << string << endl;

Here is the code:

<code>BOOL SetPrivilege(
HANDLE hToken, // access token handle
LPCTSTR lpszPrivilege, // name of privilege to enable/disable
BOOL bEnablePrivilege // to enable or disable privilege
)
{
TOKEN_PRIVILEGES tp;
LUID luid;

if ( !LookupPrivilegeValue(
NULL, // lookup privilege on local system
lpszPrivilege, // privilege to lookup
&luid ) ) // receives LUID of privilege
{
printf("LookupPrivilegeValue error: %u\n", GetLastError() );
return FALSE;
}

tp.PrivilegeCount = 1;
tp.Privileges[0].Luid = luid;
if (bEnablePrivilege)
tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
else
tp.Privileges[0].Attributes = 0;

// Enable the privilege or disable all privileges.

if ( !AdjustTokenPrivileges(
hToken,
FALSE,
&tp,
sizeof(TOKEN_PRIVILEGES),
(PTOKEN_PRIVILEGES) NULL,
(PDWORD) NULL) )
{
printf("AdjustTokenPrivileges error: %u\n", GetLastError() );
return FALSE;
}

if (GetLastError() == ERROR_NOT_ALL_ASSIGNED)

{
printf("The token does not have the specified privilege. \n");
return FALSE;
}

return TRUE;
}

Thank you once again for helping me with this.

C++ FFT subroutine

mrby12311-Apr-09 20:49

mrby123

11-Apr-09 20:49

Hi
I am looking for a subroutine of FFT written with C++.
I have a fortran version Four1(DATA,NN,ISIGN), and I am looking for its counterpart in C++.

Thanks in advance for the help.

Re: C++ FFT subroutine

CPallini11-Apr-09 22:40

CPallini

11-Apr-09 22:40

I see two options:

See [^].
Translate the FORTRAN routine.

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]

can someone explain to a newby what the top line argument call.

johnathan warfield11-Apr-09 19:53

johnathan warfield

11-Apr-09 19:53

i'm having trouble understaning this function call in the constructor.
( const char *const first, const char * const last )
i see we have a constant then a char type then a pointer to first thats declared a char constant. But isn't that declaring first a constant and a char twice. I'm reading Dietel 5th edition maybe i misread something can someone please explain this argument in the function call please to a newby.

Employee::Employee( const char * const first, const char * const last )
26 {
27 firstName = new char[ strlen( first ) + 1 ];
28 strcpy( firstName, first );
29
30 lastName = new char[ strlen( last ) + 1 ];
31 strcpy( lastName, last );
32
33 count++; // increment static count of employees
34
35 cout << "Employee constructor for " << firstName
36 << ' ' << lastName << " called." << endl;
37 } // end Employee constructor

Re: can someone explain to a newby what the top line argument call.

«_Superman_»11-Apr-09 20:54

«_Superman_»

11-Apr-09 20:54

I hope you get the idea.

const char* p;
*p = 'A';  // Error
p = arr2;  // OK

char* const p;
*p = 'A';  // OK
p = arr2;  // Error

«_Superman_»
I love work. It gives me something to do between weekends.

Re: can someone explain to a newby what the top line argument call.

David Crow13-Apr-09 3:36

David Crow

13-Apr-09 3:36

See here and here.

Re: can someone explain to a newby what the top line argument call.

johnathan warfield18-Apr-09 8:19

johnathan warfield

18-Apr-09 8:19

o.k. the newby.. after trudging on now processess the argument. the second const is simply the name given to the passed parameter const first.

What does the : x( value ) mean in this constructor ???

johnathan warfield11-Apr-09 18:25

johnathan warfield

11-Apr-09 18:25

here is a code snippet in Dietels 5th edition that i'm reading for my OOP class. I don't understand what the : x( value ) means in the constructor. The comment says initialize x to value, but can someone explain that to me in more detail please. I know its not inheritance because i haven't got to the chapter yet. Can some one please help. Here is the code snippet.

class Test
8 {
9 public:
10 Test( int = 0 ); // default constructor
11 void print() const;
12 private:
13 int x;
14 }; // end class Test
15
16 // constructor
17 Test::Test( int value )
18 : x( value ) // initialize x to value
19 {
20 // empty body
21 } // end constructor Test
.
.
.

Re: What does the : x( value ) mean in this constructor ???

«_Superman_»11-Apr-09 20:50

«_Superman_»

11-Apr-09 20:50

That is how you initialize the private data member x.
Writing x = value inside the constructor will become assignment and not initialization.

Here is an example of both -

Initialization