C / C++ / MFC

1-Jul-10 21:30

Hi!
I've stored my file contents in a Vector of std::string. My file has 55 rows of numbers. I've to get a particular row from the vector. How to do this?

Code:

void CGameMenuPlayerProfileState::setPlayerData(int countryId, int btnId)
{
 ifstream myfile("E://Work//Data//playerdata.txt.txt", ios_base::in);
 std::string line;
 vector<std::string> sets;
 vector<std::string>::iterator it = sets.begin();
 int player_no = (countryId*11)+btnId;

 while(getline(myfile, line))
 {
  //cout<<"File contents moved to Stack!"<<endl;
  sets.push_back(line);
  cout<<line;
 }
}

I've to get a particular player data using the int player_no;. i.e I've to get sets[player_no].
How to do?

Cedric Moonen1-Jul-10 21:40

Cedric Moonen

1-Jul-10 21:40

T.RATHA KRISHNAN wrote:
How to do?

You answered your question yourself:

sets[player_no];

Cédric Moonen
Software developer

Charting control [v3.0]
OpenGL game tutorial in C++

Stephen Hewitt1-Jul-10 21:45

1-Jul-10 21:45

Firstly, don't go messing round with iterators until after you've filled the collection:

ifstream myfile("E://Work//Data//playerdata.txt.txt"); // We don't need any flags here!

typedef vector<string> SetColl;
SetColl set;
string line;
while (getline(myfile, line))
{
    set.push_back(line);
}

int player_no = (countryId*11)+btnId;
if (player_no < set.size())
{
    string player_data = set[player];
}

Steve

T.RATHA KRISHNAN1-Jul-10 22:14

1-Jul-10 22:14

Hi!
It's printing "player_no" value.i.e if contrycode =1 & btnid =1,it will print 11 Not the contents of row corresponting to 11of myfile.I want the contents of the row of myfile corresponting to player_no to be printed.
How to do?

Aescleal1-Jul-10 22:29

Aescleal

1-Jul-10 22:29

What's wrong with:

sets[ player_number ]

?

I'm not sure what you're trying to do but if you only want a single row don't read the entire file. If you want player N (and you're using zero based indexing) read and discard the first N and read the (N + 1)th into the string.

Another option is to fix the size of the fields in the file so you can seek to the start of a particular line before doing a read.

Yet another is to create a class that represents each line (presumably player) and implement a constructor that initialises itself from a stream or an overloaded extraction operator.

Cheers,

Ash

Solved

T.RATHA KRISHNAN1-Jul-10 23:16

1-Jul-10 23:16

Thanks. It's working. I did a mistake.

Help for Printing?

Le@rner1-Jul-10 20:56

1-Jul-10 20:56

Hi all,

i m working on SDI type application,

i have some data in ListCtrl,in number or rows and column,i want to print this data and see preview for thing printing data.

there is data or row in List may be so large so i shift it and display in multi line,

but still is there is some problem exits.

like some times its not calculate correct no of pages to print,or some times problem in allignment.

i already checked so many articles for printing.

currently i taking help of this article for printing

Another ListView print (preview) sample.[^]

please provide me any sample application or example that perfectly print and preview the list data.

or tell me the better way or printing.

getline throws exception

T.RATHA KRISHNAN1-Jul-10 18:54

1-Jul-10 18:54

Hi!
I've got the following exception in my program.

Unhandled exception at 0x005e47c9 in SlogOut3D.exe: 0xC0000005: Access violation writing location 0x006f1b89.

My Code is:

ifstream myfile("E://Work//Data//playerdata.txt.txt", ios_base::in);
  char* line = "";
  ofstream test("E:\Work\Data\test.txt", ios_base::out);
  
  if(!myfile.is_open())
  {
   cout<<"Opening File E://Work//Data//playerdata.txt failed"<<endl;
   cout<<"ERROR Code:"<<"\t"<<GetLastError()<<endl;
  }
  if(!test.is_open())
  {
   cout<<"Opening File E://Work//Data//test.txt failed"<<endl;
   cout<<"ERROR Code:"<<"\t"<<GetLastError()<<endl;
  }
  if(myfile)
  {
   myfile.getline(line, 1);
   cout<<line<<endl;
   test.write(line, 1);
  }

Call Stack:

> SlogOut3D.exe!std::basic_istream<char,std::char_traits<char> >::getline(char * _Str=0x006f1b89, int _Count=0, char _Delim='
') Line 638 + 0x3 bytes C++
SlogOut3D.exe!std::basic_istream<char,std::char_traits<char> >::getline(char * _Str=0x006f1b89, int _Count=1) Line 596 C++
SlogOut3D.exe!CGameMenuPlayerProfileState::GUIEvent(CGameManager * pManager=0x0012fdb4, const irr::SEvent & event={...}) Line 143 C++
SlogOut3D.exe!CGameManager::OnEvent(const irr::SEvent & event={...}) Line 171 + 0x1d bytes C++
Irrlicht.dll!1000dccf()
[Frames below may be incorrect and/or missing, no symbols loaded for Irrlicht.dll]
Irrlicht.dll!10002d28()
Irrlicht.dll!1000e1b6()
Irrlicht.dll!101325ae()
Irrlicht.dll!101333b3()
shimeng.dll!6c9c4435()
gdi32.dll!763948d9()
user32.dll!760c0979()
opengl32.dll!6d50834f()
user32.dll!760bfd72()
user32.dll!760bfe4a()
user32.dll!760bfdf3()
user32.dll!760c018d()
user32.dll!760b8343()
Irrlicht.dll!10134005()
SlogOut3D.exe!main() Line 24 + 0x25 bytes C++
SlogOut3D.exe!_QueryPerformanceFrequency@4() + 0x347f bytes C++
SlogOut3D.exe!004f7f26()
kernel32.dll!7600d0e9()
ntdll.dll!773b19bb()
ntdll.dll!773b198e()
SlogOut3D.exe!applyAnisotropicFriction() + 0x4f bytes
Irrlicht.dll!10044800()

How to resolve this exception?

Stephen Hewitt1-Jul-10 18:58

1-Jul-10 18:58

Dump the char* and use std::string instead:

// Console.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <tchar.h>
#include <iostream>
#include <string>
#include <fstream>

using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
	ifstream ifs("C:\\In.txt");

	string line;
	while (getline(ifs, line))
	{
	    cout << line << endl;
	}

	return 0;
}

Steve

T.RATHA KRISHNAN1-Jul-10 19:08

1-Jul-10 19:08

Hi!
getline() expects only a char* not a std::string. IT shows error.

Stephen Hewitt1-Jul-10 19:14

1-Jul-10 19:14

There's a getline[^] which accepts std::strings. Have you added #include <string> to the include files? If you haven't added using namespace std; somewhere in the scope remember you need to use a fully qualified name: std::string.

Steve

T.RATHA KRISHNAN1-Jul-10 19:35

Problem with '&' character to dispaly in Static Text control.

1-Jul-10 19:35

Thanks. It works.

Le@rner1-Jul-10 18:16

Re: Problem with '&' character to dispaly in Static Text control.

1-Jul-10 18:16

Hi all,

i have an static text control when i use to display some text in Static control,use SetWindowText

my text is "Test & Test Project" but its display like "Test _ Test Project" or "Test Test Project".

please tell me how can display the same text as it is whether it is contain 1 & or 2 &.

thank in advnace.

«_Superman_»1-Jul-10 18:22

«_Superman_»

1-Jul-10 18:22

Use double ampersand - "Test && Test Project"

«_Superman_»

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

Microsoft MVP (Visual C++)

Polymorphism in C

Re: Problem with '&' character to dispaly in Static Text control.

Stephen Hewitt1-Jul-10 18:23

Re: Problem with '&' character to dispaly in Static Text control.

1-Jul-10 18:23

Try using two "&" characters: "Test && Test Project".

Steve

Le@rner1-Jul-10 18:27

Re: Problem with '&' character to dispaly in Static Text control.

1-Jul-10 18:27

its a entry that is filled by user,how can i insist the user to enter && in place of &,

think if he did it but there no similarity again betwwn entered value and displayed value.

he enterd && but dispaly onle 1 &,

please tell me how can i handle it.

Stephen Hewitt1-Jul-10 18:39

Re: Problem with '&' character to dispaly in Static Text control.

1-Jul-10 18:39

The cleanest approach would be to add the SS_NOPREFIX[^] style to the control.

Steve

Le@rner1-Jul-10 18:58