|
First. I appreciate that you spend your time to read my question.
I have question about how to define an object array at private area.
For example: I have a class which is call base_class; I want to create a new class which is called
new_class; But I want to define base_class[50] in my new class. Could someone help me?
When I am compiler my main program, I got following message.
"studentDB.h type name expected "
But I didn't get any wrong message when I was compiler both student.cpp and studentDB.cpp files.
The following code is what I write in my program;
//This is my main program--------------------------------------------
#include <iostream>
#include <fstream>
#include <string>
#include "studentDB.h"
using namespace std;
int main()
{
string filename[2]; //declare an array to save a input filename and a output filename;
cout << "Enter input file name: ";
cin >> filename[0];
cout << "Enter output file name: ";
cin >> filename[1];
student_db database; //create a class
if(database.read_data(filename[0],filename[1]))
{
cout << "Data for " << database.how_many_record() << " students was read into the database…\n";
bool should_I_leave=false;
char command; //The variable will save the command that user choose.
string temp_info[4];
int temp_age;
while(!should_I_leave) //When user type Q or q will leave loop.
{
cout << "Enter command (A -> add, R -> remove, D -> display, S -> show all, Q -> quit): ";
cin >> command;
switch (command)
{
case 'A': case 'a':
cout << "Enter social security number: ";
cin >> temp_info[0];
cout << "Enter last name: ";
cin >> temp_info[1];
cout << "Enter first name: ";
cin >> temp_info[2];
cout << "Enter age: ";
cin >> temp_age;
cout << "Enter phone: ";
cin >> temp_info[3];
if(database.add_Student(temp_info[0],temp_info[1],temp_info[2],temp_age,temp_info[3]))
cout << "Student added!\n";
else
cout << "Student with ssn: " << temp_info[0] << " already exist!\n";
break;
case 'D': case 'd':
cout << "Enter ssn of student to display: ";
cin >> temp_info[0];
database.display_Student(temp_info[0]);
break;
case 'R': case 'r':
cout << "Enter ssn of student to display: ";
cin >> temp_info[0];
if(database.delete_Student(temp_info[0]))
cout << "Student deleted!\n";
else
cout << "Student with ssn: " << temp_info[0] << " NOT found!\n";
break;
case 'S': case 's':
database.display_all();
break;
case 'Q': case 'q':
database.write_result();
should_I_leave=true;
break;
}
}
}
else
{
cout << "the name of the file does not exist\n";
}
return 0;
}
// I define the function of the student_db here.----------------------------------
//filename: studentDB.cpp
#include <iostream>
#include <string>
#include <fstream>
#include <iomanip>
#include "student.h"
#include "studentDB.h"
using namespace std;
// The function will return a value that showing how many records in database.
int student_db::how_many_record()
{
return how_many_in_database;
}
// add a student to the database – return true if successful, false otherwise
bool student_db::add_Student(string ssn, string lastname, string firstname, int age, string phone)
{
if(searchSSN(ssn)==-1) //if the SSN cann't find in the array, saving a new record to the array.
{
student_collect[how_many_in_database].set_ssn(ssn);
student_collect[how_many_in_database].set_lastname(lastname);
student_collect[how_many_in_database].set_firstname(firstname);
student_collect[how_many_in_database].set_age(age);
student_collect[how_many_in_database].set_phone(phone);
how_many_in_database++; //We add 1 to count after we add one person to the array.
SortBySSN();// The function will write out a table of students sorted by social security number (in ascending order)
return true;
}
else
return false;
}
//The function will call searchSSN function to search a data and searchSSN function will return a index.
// delete student with a particular social security number – return true if successful
// and false otherwise
bool student_db::delete_Student(string ssn)
{
int check=0;
check=searchSSN(ssn);
if(check!=-1) //if the index number is not -1, the program will start remove a record.
{
swap(check,how_many_in_database-1);
how_many_in_database--;
SortBySSN();
return true;
}
else
return false;
}
// display the data for student if present in the database – otherwise error message
void student_db::display_Student(string ssn)
{
int check=0;
check=searchSSN(ssn);
if(check!=-1)
{
cout << "\tStudent Data: \n";
cout << "\t\tSSN: " << student_collect[check].show_ssn() << endl;
cout << "\t\tLast Name: " << student_collect[check].show_lastname() << endl;
cout << "\t\tFirst Name: " << student_collect[check].show_firstname() << endl;
cout << "\t\tPhone Number: " << student_collect[check].show_phone() << endl;
cout << "\t\tAge: " << student_collect[check].show_age() << endl;
}
else
cout << "Student with ssn: " << ssn << " NOT found\n";
}
// display data for ALL the student in the database
void student_db::display_all()
{
cout << setw(10) << "Last Name" << setw(10) << "First Name" << setw(16) << "SSN" << setw(18) << "Phone Number" << setw(7) << "Age" << endl;
for(int i=0;i<how_many_in_database;i++)
{
cout << setw(10) << student_collect[i].show_lastname() << setw(10) << student_collect[i].show_firstname() << setw(16) << student_collect[i].show_ssn() << setw(18) << student_collect[i].show_phone() << setw(7) << student_collect[i].show_age() << endl;
}
cout << endl;
}
student_db::student_db()
{
max_people_in_database=50; //How many people do you have?
}
student_db::~student_db()
{
Savefile.close();
Openfile.close();
}
// The function will write out a table of students sorted by SSN or Last Name.
//The parameter that is called datanumber will tell the fuction how many loop does it need.
void student_db::write_result()
{
Savefile << endl;
for(int i=0;i<how_many_in_database;i++)
{
Savefile << setw(10) << student_collect[i].show_lastname() << setw(10) << student_collect[i].show_firstname() << setw(16) << student_collect[i].show_ssn() << setw(18) << student_collect[i].show_phone() << setw(7) << student_collect[i].show_age() << endl;
}
Savefile << endl;
}
//The function that use binary search algorithm will return -1 if it can not find same SSN in the array or return index if it find the SSN.
//The first parameter tell the function SSN that the function need to check.
//The second parameter tell the function how many loop it should do.
int student_db::searchSSN(string ssn)
{
int returnvalue=0;
if(ssn==student_collect[how_many_in_database/2-1].show_ssn())
{
returnvalue=how_many_in_database/2-1;
}
else if( ssn > student_collect[how_many_in_database/2-1].show_ssn())
{
for(int i=how_many_in_database/2; i<how_many_in_database;i++)
{
if(ssn==student_collect[i].show_ssn())
{
returnvalue=i;
i=how_many_in_database; //finding the value, leaving loop
}
else
returnvalue=-1;
}
}
else
{
for( int i=0;i < how_many_in_database/2 ; i++)
{
if(ssn==student_collect[i].show_ssn())
{
returnvalue=i;
i=how_many_in_database; //finding the value, leaving loop
}
else
returnvalue=-1;
}
}
return returnvalue;
}
// The function will exchange the content of these two parameters
void student_db::swap(int i,int j)
{
student temp;
temp=student_collect[i];
student_collect[i]=student_collect[j];
student_collect[j]=temp;
}
// The function will save students sorted by social security number (in ascending order).
// The parameter that is called datanumber will tell the fuction how many loop does it need.
void student_db::SortBySSN()
{
for(int i=0;i<how_many_in_database;i++)
{
for(int j=i+1;j<how_many_in_database;j++)
{
if(student_collect[i].show_ssn() > student_collect[j].show_ssn())
swap(i,j);
}
}
}
// read data from disk - return true if data exist, false otherwise.
bool student_db::read_data(string in_filename, string out_filename)
{
Openfile.open(in_filename.c_str());
if(Openfile==NULL) //IF FILE DOES NOT EXIST, finish the function.
{
return false;
}
else // executing this scope if the file exist
{
Savefile.open(out_filename.c_str());
input_filename=in_filename; //recording a name of the inputfile to filename[0]
output_filename=out_filename; //recording a name of the outputfile to filename[1]
string temp_use; //the variable will save a string that read from inputfile for temp.
int temp_int_use; //the variable will save a integer that read from inputfile for temp.
for(int i=0;i<max_people_in_database;i++) //reading data to database
{
if(Openfile==NULL) //leaving for loop if there is nothing in the file.
break;
Openfile >> temp_use;
student_collect[i].set_lastname(temp_use);
Openfile >> temp_use;
student_collect[i].set_firstname(temp_use);
Openfile >> temp_use;
student_collect[i].set_ssn(temp_use);
Openfile >> temp_use;
student_collect[i].set_phone(temp_use);
Openfile >> temp_int_use;
student_collect[i].set_age(temp_int_use);
how_many_in_database=i; //the variable will record how many data in database.
}
SortBySSN();
return true;
}
}
// This is my new class.
//filename: studentDB.h
class student_db
{
public:
// add a student to the database – return true if successful, false otherwise
bool add_Student(std::string , std::string , std::string , int , std::string);
// delete student with a particular social security number – return true if successful
// and false otherwise
bool delete_Student(std::string);
// display the data for student if present in the database – otherwise error message
void display_Student(std::string);
// display data for ALL the student in the database
void display_all();
// read data from disk - return true if data exist, false otherwise.
bool read_data(std::string,std::string);
// The function will write out a table of students sorted by SSN or Last Name.
void write_result();
// The function will return a value that showing how many records in database.
int how_many_record();
student_db();
~student_db();
private:
// The function will save students sorted by social security number (in ascending order).
// The parameter that is called datanumber will tell the fuction how many loop does it need.
void SortBySSN();
// The function will exchange the content of these two parameters
void swap(int,int);
//The function that use binary search algorithm will return -1 if it can not find same SSN in the array or return index if it find the SSN.
//The first parameter tell the function SSN that the function need to check.
//The second parameter tell the function how many loop it should do.
int searchSSN(std::string);
std::ifstream Openfile;
std::ofstream Savefile;
int how_many_in_database; //recording how many data in the database.
int max_people_in_database;
std::string input_filename; //input_filename record the inputfile name.
std::string output_filename; //output_filename record the outfilename;
student student_collect[50]; //You can change your max number of the people here.
};
//I define the function of the student class here.----------------------------------------------
//filename:student.cpp
#include <iostream>
#include "student.h"
//--------------------------------------------------------------------------------
// The following functions declare for the class of student.
//--------------------------------------------------------------------------------
std::string student::show_lastname()
{
return lastname;
}
std::string student::show_firstname()
{
return firstname;
}
std::string student::show_ssn()
{
return ssn;
}
int student::show_age()
{
return age;
}
std::string student::show_phone()
{
return phone;
}
void student::set_lastname(std::string text)
{
lastname=text;
}
void student::set_firstname(std::string text)
{
firstname=text;
}
void student::set_ssn(std::string text)
{
ssn=text;
}
void student::set_age(int number)
{
age=number;
}
void student::set_phone(std::string text)
{
phone=text;
}
// student class is my basic class------------------------------------------
//filename:student.h
class student
{
public:
void set_lastname(std::string );
void set_firstname(std::string );
void set_ssn(std::string );
void set_age(int);
void set_phone(std::string );
std::string show_lastname();
std::string show_firstname();
std::string show_ssn();
int show_age();
std::string show_phone();
private:
std::string lastname;
std::string firstname;
std::string ssn;
int age;
std::string phone;
};
|
|
|
|
|
This line in studentDB.h
student student_collect[50];
is using student without this type being defined first. Just #include "student.h" at studentDB.h and at least your first problem should go away (I haven't compiled any further.)
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
Want a Boost forum in Code Project? Vote here[^]!
|
|
|
|
|
Thank you help. It work.
Bless you.
|
|
|
|
|
Hi All,
I am trying to generate a binary image from a normal image and obtain it as a matrice. Could anyone teach me how can it be made? I knew that in matlab, it is possible to do it within a few lines. But how can I do that in VC++?
thanks!
Jason
|
|
|
|
|
This will taken more than a few lines.
First you'll need an interface, define how to open images, how to display them etc. The MFC Doc/View project created with the wizard will give you a skeleton where you can fill in the code for the opening/displaying. But you'll have to figure out how to use it.
To load the actual image into memory you will need a library that will decode the image from some format (jpeg, bitmap, gif etc) and give you the pixels. There are many libraries that do that. You can try
http://www.codeproject.com/bitmap/cximage.asp[^]
You can also see the demo code and modify it. The page also lists other libraries.
The conversion to binary image you'll probably have to do yourself. That should be easy once you have the pixels to the loaded image.
|
|
|
|
|
|
When I start up my application, the main window contains a toolbar...Toolbar.bmp, that is loaded, I believe, in Mainframe.cpp with OnCreate(). I DO NOT want to load the toolbar. How can I keep it from loading? I have tried modifying OnCreate(), but cant get it to work. I am not doing something correctly. Can someone help me out??
Thanks.
Jerry
|
|
|
|
|
Not sure what version of VS you're using, but in 2003:
1) Go to the CMainFrame .h file, and comment out:
<br />
CToolBar m_wndToolBar;<br />
2) Go to the CMainFrame::OnCreate in the .cpp file, and comment out:
<br />
if (!m_wndToolBar.CreateEx(this, TBSTYLE_FLAT, WS_CHILD | WS_VISIBLE | CBRS_TOP<br />
| CBRS_GRIPPER | CBRS_TOOLTIPS | CBRS_FLYBY | CBRS_SIZE_DYNAMIC) ||<br />
!m_wndToolBar.LoadToolBar(IDR_MAINFRAME))<br />
{<br />
TRACE0("Failed to create toolbar\n");<br />
return -1;
}<br />
and...
<br />
m_wndToolBar.EnableDocking(CBRS_ALIGN_ANY);<br />
EnableDocking(CBRS_ALIGN_ANY);<br />
DockControlBar(&m_wndToolBar);<br />
 Pssst. You see that little light on your monitor? That's actually a spy camera, and I'm tracking your every move...
|
|
|
|
|
hi everybody,
i know, this has benn posted already, but i can't figure out where (and when) it was asked.
...so here is my problem....
i have an MFC application, which is dialog based. a main dialog allow the user to type some stuff, and a "sub-dialog" permit to configurate the application. my pb is that, i do not know how to pass datas back from the Options dialog to the main dialog. and i'm not even sure of a good way to pass the state of the application to the options dialog when it creates...
if anyone could help...
i've got another guess. how can i, still in a dialog dox application, change the default button ? i've tried with changing the styles (SetStyle() or something like that) of the buttons, but it only changes the STYLE, and not the effective function of DEFAULT BUTTON.
Any kind of idea ?
thx for all
cheers,
TOXCCT >>> GEII power
|
|
|
|
|
What kind of dialog window is the options dialog? Is it modal? In general, get the latest configuration from the modal dialog window.
Kuphryn
|
|
|
|
|
Try here.
"Opinions are neither right nor wrong. I cannot change your opinion of me. I can, however, change what influences your opinion." - David Crow
|
|
|
|
|
where ? (can't find any article about it with your link)
(and sorry for answering so late, but no connection is...no connection)
TOXCCT >>> GEII power
|
|
|
|
|
I hate it when links stop working.
http://www.codeproject.com/script/comments/forums.asp?forumid=1647&select=950783&df=100&fr=3441.5#xx950783xx
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
|
|
|
|
|
Hi ...
I hope somebody can help me. I am new on Visual C++ 6. Now I`m testing around for a bit. I know that there is a way to show all avaible methods on an element after the "." ...
If I give m_List1 (edited in Class-Editor->Member-Variables) an then the dot (.) Studio shows all useable methods.
Can anybody telle where I can change this option. Now it shows nothing if I give the dot.
Best regards
Steffen
|
|
|
|
|
This is a feature of v6. I'm not exactly sure what causes it, or even what fixes it, but try deleting the project's temporary files (e.g., ncb, aps, clw, opt).
"Opinions are neither right nor wrong. I cannot change your opinion of me. I can, however, change what influences your opinion." - David Crow
|
|
|
|
|
Hello,
could you explain me please how to change from my code, the 'Caption' and 'Visible' properties of a button ?
thank you for help,
I wish you all a nice day
alain
There is no way to happiness, happiness is the way !
|
|
|
|
|
To change the caption of your button:
GetDlgItem(IDC_YOURBUTTON)->SetWindowText("Button Caption");
To set it visible/invisible:
GetDlgItem(IDC_YOURBUTTON)->ShowWindow(SW_SHOW);<br />
GetDlgItem(IDC_YOURBUTTON)->ShowWindow(SW_HIDE);
Hope this helps
|
|
|
|
|
yes it helps !
Thank you very much cedric !
alain
There is no way to happiness, happiness is the way !
|
|
|
|
|
you can do this in many ways :-
1-
use GetDlgitem function as
CButton * btn=(CButton*)GetDlgItem(IDCANCEL);
btn->ShowWindow(0);
2-use EnableWindow
CButton * btn=(CButton*)GetDlgItem(IDCANCEL);
btn->EnableWindow(false);
//use true for Enable agine
faroq from yemen thammar
working in thammar universty and my intersted about network and security
im programmer from 6 years ago and ihave my B.C from this universty
|
|
|
|
|
Thanks a lot Faroqtam, it works very well.
It's very kind of you !
I wish you a nice day and see you soon !
alain
There is no way to happiness, happiness is the way !
|
|
|
|
|
sweep123 wrote:
I did download Tom Archers example from the Code Project, but it failed to build with error:-
I trust you posted a messages similar to this one at his article.
sweep123 wrote:
Also if I just want to Copy/Paste text from a listCtrl is it that complicated?
Complicated is a relative term. Like most anything, it's not complicated if you know how.
"Opinions are neither right nor wrong. I cannot change your opinion of me. I can, however, change what influences your opinion." - David Crow
|
|
|
|
|
I have now posted a message on Tom's article (I just though that it was my compiler/linker setings which was causing the problem).
The reason for the post was to seek a reduced piece of code just to transfer from one sub-item of a listCtrl to the clipboard.
Tom's article had quite a bit of code.
Also I thought that many people must have implemented something to do this before.
|
|
|
|
|
To get the text value of an item/subitem, use GetItemText(). To copy to the clipboard, use SetClipboardData(CF_TEXT, ...).
"Opinions are neither right nor wrong. I cannot change your opinion of me. I can, however, change what influences your opinion." - David Crow
|
|
|
|
|
Hello,
I have a program that is in the tray and when a user logout, restart or shutdown I need to make a log when my program exit but I don't get it to work.
I have try with OnCancel(), OnOK() and OnClose() but it don't work.
So how can I make my stuf before my program exit?
|
|
|
|
|
None of the given
Read from MSDN about WM_QUERYENDSESSION
|
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
