Template problem - C / C++ / MFC Discussion Boards

Dear all,

The only reason I posted the whole code was to give one the chance to run the program and see in practice the problem.
But I guess that is too much.
Anyway,
The implementation of the two functions is:
[code]
//It returns the member.
Member* AssociationList<book,member>::get_member(Book* book)
{
Member* member=0;
bool searching=true;
int index=0;

while(searching)
{
if (this->association_list[index])
if (this->association_list[index]->linked_book()==book)
{
member=this->association_list[index]->linked_member();
searching=false;
}
else
index++;
else
index++;
if (searching && (index == LIST_SIZE))
{
searching=false;
}
}
return member;
}
[/code]

[code]
//it returns the book
template<class book,class="" member="">
Book* AssociationList<book,member>::get_book(Member* member)
{
Book* book=0;
bool searching=true;
int index=0;

while(searching)
{
if (this->association_list[index])
if (this->association_list[index]->linked_member()==member)
{
book=this->association_list[index]->linked_book();
searching=false;
}
else
index++;
else
index++;
if (searching && (index == LIST_SIZE))
{
searching = false;
}
}
return book;
}
[/code]

The template file that I use to display the books is:
[code]
template<class object="">
void List<object>::displayElement(char* type)
{
if (num_elements == 0)
cout<<"No "<<type<<" is="" found="" in="" the="" "<<type<<"="" array.\n";
="" else
="" for(int="" element="0;" element<this-="">num_elements; element++)
{
cout<<'\n';
this->element_list[element]->display(association_list.get_member(element_list[element]));
}
}
[/code]
But it does not work for Members. I've tried to use the recommendations you've told me but it seems not to work.

The program works ok, when I call the functions:
book1.addElement("Books"); and book1.displayElement("Books");
to add a book and to display them respectively.

But when I use the :
member1.addElement("Member"); and member1.displayElement("Member"); it dispalys the problem:

The compiler complains at the point:
this->element_list[element]->display(association_list.get_member(element_list[element])); saying that : get_member: cannot convert parameter one from Class Member* to class Book*.

Can you correct any mistakes or suggest any solutions?
Please if you make any suggestion adjust them to my code, if possible.
Best Regards,
grscot

Below the message editing area you will see a Formatting bar. You need to select all of your code and then click on "pre" and "code" to make it readable. Untill you start doing that your code examples are useless.

Also short to the point snippets of code are far better than long winded examples.

Neville Franks, Author of ED for Windows. www.getsoft.com
Make money with our new Affilate program

...however, you will have to turn your less than and greater than into HTML escapes, and avoid any smiley combination...
unless things changed since I last tried to post code

"Der Geist des Kriegers ist erwacht / Ich hab die Macht" StS

sighist | Agile Programming | doxygen

peterchen wrote:
...however, you will have to turn your less than and greater than into HTML escapes, and avoid any smiley combination...
unless things changed since I last tried to post code

Yes you're right. The Formatting bar has options for this too. ie. < and >

Neville Franks, Author of ED for Windows. www.getsoft.com
Make money with our new Affilate program

I am using the GetCurrentImage function from the IBasicVideo Interface in DirectX like in the example below.

char *buffer = new char[size];
hr = pBV->GetCurrentImage(&size, (long*)buffer);

the buffer is meant to contain the image data from the video stream.

How Can I place these in the IStream Interface, so that i can then pass the IStream in the Image class from GDI+

Any help would be great

Hello All.

I currently have a need to add in a color palette (for picking custom colors) in my application. I have a simple color palette working, but I know there must be a much better way of doing it, in addition, a much nicer looking one.

Anyone have any pointers on where to look for this kind of information?

Thanks.

Confused | :confused:

-stv

http://www.codeproject.com/miscctrl/

Trust in the code Luke. Yea right!

Dear all,
The concept behind the code is:
There is an associationlist that holds association pointers. Each association pointer has two pointers, that point to a book and to a member object respectively.
Now what I'm trying to do is:
To have the association pointer to use its two pointers to point to an array of books(booklist, up to 10 books) and to an array of members  (memberlist, up to 10) respectively. 
If you copy and paste the code the program works ok only for books(adding a new book to the booklist(up to 3 for test purposes) and displaying the books).
If one wants to add a member and display the members, they have to use the function: get_book(); in the file: 
template<class Object>
void List<Object>::displayElement(char* type) of the List.cpp, and also to put in comments the //book1.displayElement("Books"); of the main.cpp file.

If I don't use the comments in the main.cpp file and use the get_book() function then an error will occur: " 'get_book':cannot convert parameter 1 from 'class Book*' to 'class Member*' "

Could someone suggest a solution using a single template function, for displaying members and books?
The code of each file is:

<br />
//Association.h<br />
#ifndef _ASSOCIATION<br />
#define _ASSOCIATION<br />
//#include "Book.h"<br />
//#include "Member.h"<br />
<br />
template<class Book,class Member><br />
class Association<br />
{<br />
	public:<br />
		//Sets up book and member with parameters<br />
		Association(Book* book, Member* member);<br />
		<br />
		//Returns Book<br />
		Book* linked_book(){return this->book;}<br />
		<br />
		//Returns Member<br />
		Member* linked_member(){return this->member;}<br />
		<br />
	private:<br />
		Book* book;<br />
		Member* member;<br />
};<br />
#endif<br />

<br />
//Association.cpp<br />
#ifndef _ASSOCIATIONCPP<br />
#define _ASSOCIATIONCPP<br />
#include "Association.h"<br />
<br />
template<class Book,class Member><br />
Association<Book,Member>::Association(Book* book, Member* member)<br />
{<br />
	this->book=book;<br />
	this->member=member;<br />
}<br />
#endif<br />

<br />
//AssociationList.h<br />
#ifndef _ASSOCIATIONLIST<br />
#define _ASSOCIATIONLIST<br />
#include "Association.h"<br />
//#include "Book.h"<br />
//#include "Member.h"<br />
<br />
const int LIST_SIZE=100;<br />
<br />
template<class Book,class Member><br />
class AssociationList<br />
{<br />
public:<br />
	//It initialises all slots in the associationlist array to zero.<br />
	AssociationList();<br />
<br />
	/* It searches the associationlist, if book is found then returns <br />
	   the member that is connected with.*/<br />
	    Member* get_member(Book* book);<br />
	<br />
	/* It searches the associationlist, if member is found then returns<br />
	   the book that is connected with.*/ <br />
	    Book* get_book(Member* member);<br />
<br />
	   template<class R,class P><br />
	   R* get_member(P* pArg);<br />
	<br />
	/* Checks that book/member not already linked<br />
	   creates association if objects are free to link<br />
	   returns whether or not link was valid */<br />
	bool link(Book* book,Member* member);<br />
<br />
	/* Checks that book and member are linked <br />
	   deletes association if they are linked<br />
	   returns whether or not unlinking was valid */<br />
	bool unlink(Book* book,Member* member);<br />
private:<br />
	Association<Book,Member>* association_list[LIST_SIZE];<br />
};<br />
#endif<br />

<br />
//AssociationList.cpp<br />
#ifndef _ASSOCIATIONLISTCPP<br />
#define _ASSOCIATIONLISTCPP<br />
#include <iostream><br />
#include "Association.h"<br />
#include "Association.cpp"<br />
#include "AssociationList.h"<br />
#include "Book.h"<br />
#include "Member.h"<br />
using namespace std;<br />
<br />
template<class Book,class Member><br />
AssociationList<Book,Member>::AssociationList()<br />
{<br />
	cout<<"AssociationList constructor called\n";<br />
	int index;<br />
<br />
	for(index=0; index<LIST_SIZE; index++)<br />
		this->association_list[index]=0;<br />
}<br />
<br />
/*template<class R,class P><br />
R* AssociationList<Book,Member>::get_member(P* pArg)<br />
{<br />
	R* member=0;<br />
	bool searching=true;<br />
	int index=0;<br />
<br />
	while(searching)<br />
	{<br />
		if (this->association_list[index])<br />
			if (this->association_list[index]->linked_book()==book)<br />
			{<br />
				member=this->association_list[index]->linked_member();<br />
				searching=false;<br />
			}<br />
			else<br />
				index++;<br />
		else<br />
			index++;<br />
		if (searching && (index == LIST_SIZE))<br />
		{<br />
			searching=false;<br />
		}<br />
	}<br />
	return member;<br />
}*/<br />
<br />
<br />
template<class Book,class Member><br />
//Member* AssociationList::get_member(Book* book)<br />
<br />
Member* AssociationList<Book,Member>::get_member(Book* book)<br />
{<br />
	Member* member=0;<br />
	bool searching=true;<br />
	int index=0;<br />
<br />
	while(searching)<br />
	{<br />
		if (this->association_list[index])<br />
			if (this->association_list[index]->linked_book()==book)<br />
			{<br />
				member=this->association_list[index]->linked_member();<br />
				searching=false;<br />
			}<br />
			else<br />
				index++;<br />
		else<br />
			index++;<br />
		if (searching && (index == LIST_SIZE))<br />
		{<br />
			searching=false;<br />
		}<br />
	}<br />
	return member;<br />
}<br />
<br />
template<class Book,class Member><br />
Book* AssociationList<Book,Member>::get_book(Member* member)<br />
{<br />
	Book* book=0;<br />
	bool searching=true;<br />
	int index=0;<br />
<br />
	while(searching)<br />
	{<br />
		if (this->association_list[index])<br />
			if (this->association_list[index]->linked_member()==member)<br />
			{<br />
				book=this->association_list[index]->linked_book();<br />
				searching=false;<br />
			}<br />
			else<br />
				index++;<br />
		else<br />
			index++;<br />
		if (searching && (index == LIST_SIZE))<br />
		{<br />
			searching = false;<br />
		}<br />
	}<br />
	return book;<br />
}<br />
<br />
template<class Book,class Member><br />
bool AssociationList<Book,Member>::link(Book* book,Member* member)<br />
{<br />
	bool searching=true;<br />
	bool success=true;<br />
	int index=0;<br />
	int free_slot;<br />
<br />
	while(searching)<br />
	{<br />
		if(this->association_list[index])<br />
			if((this->association_list[index]->linked_book()==book ||<br />
				(this->association_list[index]->linked_member()==member)))<br />
		{<br />
			searching=false;<br />
			success=false;<br />
		}<br />
			else<br />
				index++;<br />
		else<br />
		{<br />
			free_slot=index;<br />
			index++;<br />
		}<br />
		if(searching&&(index == LIST_SIZE))<br />
			searching=false;<br />
	}<br />
	if (success)<br />
		this->association_list[free_slot]=new Association(book,member);<br />
	return success;<br />
}<br />
<br />
template<class Book,class Member><br />
bool AssociationList<Book,Member>::unlink(Book* book,Member* member)<br />
{<br />
	bool searching=true;<br />
	bool success=true;<br />
	int index=0;<br />
	int link_slot;<br />
<br />
	while(searching)<br />
	{<br />
		if (this->association_list[index])<br />
			if (this->association_list[index]->linked_book()==book &&<br />
				this->association_list[index]->linked_member()==member)<br />
			{<br />
				searching=false;<br />
				link_slot=index;<br />
			}<br />
			else<br />
				index++;<br />
		else<br />
		{<br />
			index++;<br />
		}<br />
		if (searching && (index == LIST_SIZE))<br />
		{<br />
			searching=false;<br />
			success=false;<br />
		}<br />
	}<br />
	if (success)<br />
		delete this->association_list[link_slot];<br />
	return success;<br />
}<br />
#endif<br />

<br />
//Book.cpp<br />
#include<iostream><br />
#include"Book.h"<br />
#include"Member.h"<br />
using namespace std;<br />
<br />
Book::Book()<br />
{<br />
	cout<<"Book constructor called called\n";<br />
	this->bookDetails=get_string_ver2("input book title and author separated by a comma and a space character: ");<br />
}<br />
<br />
Book::~Book()<br />
{<br />
	if (this->bookDetails)<br />
		delete [] this->bookDetails;<br />
}<br />
<br />
void Book::display(Member* borrower)<br />
{<br />
	cout<<"Book title and author are: "<<this->bookDetails<<"."<<endl;<br />
	if (borrower)<br />
		cout<<"The member's name is: "<<borrower->get_name()<<"."<<endl;<br />
	else<br />
		cout<<"No member has borrowed a book."<<endl;<br />
}<br />

<br />
//Book.h<br />
#ifndef _BOOK<br />
#define _BOOK<br />
#include "utility.h"<br />
class Member;//Forward Reference<br />
class Book<br />
{<br />
public:<br />
	//Reads and allocates space for title and author.<br />
	Book();<br />
	<br />
	//Releases the space pointed at by the title and author.<br />
	~Book();<br />
	<br />
	//Returns the book title and author.<br />
	char* get_bookDetails(){return this->bookDetails;}<br />
<br />
	//Displays the book title and author and the member who has borrowed the book as applicable.<br />
	void display(Member* borrower);<br />
private:<br />
	Member* borrower;<br />
	char* bookDetails;<br />
};<br />
#endif<br />

<br />
//Member.cpp<br />
#include<iostream><br />
#include"Book.h"<br />
#include"Member.h"<br />
using namespace std;<br />
<br />
Member::Member()<br />
{<br />
	cout<<"Member constructor called\n";<br />
	this->name=get_string("Input member's surname and forename respectively, separated by a comma and a space character: <br />
<br />
");<br />
}<br />
<br />
Member::~Member()<br />
{<br />
	if (this->name)<br />
		delete [] this->name;<br />
}<br />
<br />
void Member::display(Book* book)<br />
{<br />
	cout<<"Member's name is: "<<this->name<<"."<<endl;<br />
	if (book)<br />
		cout<<"Book title and author are: "<<book->get_bookDetails()<<"."<<endl;<br />
	else<br />
		cout<<this->name<<" has not borrowed any book."<<endl;<br />
}<br />

<br />
//Member.h<br />
#ifndef _MEMBER<br />
#define _MEMBER<br />
#include "utility.h"<br />
class Book;//Forward Reference<br />
class Member<br />
{<br />
public:<br />
	//Reads and allocates space for member's full name.<br />
	Member();<br />
	<br />
	//Releases the space pointed at by name.<br />
	~Member();<br />
<br />
	//Returns member's full name.<br />
	char* get_name(){return this->name;}<br />
<br />
	//Displays the member's full name and the book borrowed by the member as applicable. <br />
	void display(Book* book);<br />
private:<br />
	Book* book;<br />
	char* name;<br />
};<br />
#endif<br />

<br />
//List.cpp<br />
#ifndef _LISTCPP<br />
#define _LISTCPP<br />
#include <iostream><br />
#include "AssociationList.h"<br />
//#include "Book.h"<br />
#include "List.h"<br />
//#include "Member.h"<br />
<br />
using namespace std;<br />
<br />
template<class Object><br />
List<Object>::List()<br />
{<br />
	this->num_elements=0;<br />
}<br />
<br />
template<class Object><br />
List<Object>::~List()<br />
{<br />
	for(int element=0; element<this->num_elements; element++)<br />
		delete this->element_list[element];<br />
}<br />
<br />
template<class Object><br />
void List<Object>::addElement(char* type)<br />
{<br />
	if (this->num_elements == MAX_ELEMENTS)<br />
	{<br />
		cout<<"No more room in the "<<type<<" array.\n";<br />
		cout<<"The maximum number of "<<type<<" is "<<MAX_ELEMENTS<<"."<<endl;<br />
	}<br />
	else<br />
	{<br />
		this->element_list[num_elements]=new Object;<br />
		(this->num_elements)++;<br />
	}<br />
}<br />
<br />
template<class Object><br />
void List<Object>::displayElement(char* type)<br />
{<br />
	if (num_elements == 0)<br />
		cout<<"No "<<type<<" is found in the "<<type<<" array.\n";<br />
	else<br />
		for(int element=0; element<this->num_elements; element++)<br />
		{<br />
			cout<<'\n';<br />
			this->element_list[element]->display(association_list.get_member(element_list[element]));<br />
		}<br />
}<br />
<br />
<br />
template<class Object><br />
void List<Object>::borrowElement()<br />
{<br />
	cout<<"Borrow book function invoked\n";<br />
}<br />
<br />
template<class Object><br />
void List<Object>::returnElement()<br />
{<br />
	cout<<"Return book function invoked\n";<br />
}<br />
<br />
<br />
<br />
#endif<br />

<br />
//List.h<br />
#ifndef _LIST<br />
#define _LIST<br />
#include "AssociationList.h"<br />
#include "Book.h"<br />
#include "Member.h"<br />
const int MAX_ELEMENTS=3;<br />
template<class Object><br />
class List<br />
{<br />
	public:<br />
			List();<br />
			~List();<br />
			void addElement(char* type);<br />
			void removeElement();<br />
			void displayElement(char* type);<br />
			void borrowElement();<br />
			void returnElement();<br />
	private:<br />
			AssociationList<Book,Member>association_list;<br />
			Object* element_list[MAX_ELEMENTS];<br />
			int num_elements;<br />
};<br />
#endif<br />

<br />
//utility.cpp<br />
#include <iostream><br />
#include <cstring><br />
#include <ctype.h><br />
using namespace std;<br />
#define cinFlush cin.seekg(ios::end)<br />
<br />
char* get_string (char* prompt)<br />
{<br />
	const int MAX_SIZE=100;<br />
	char string[MAX_SIZE];<br />
	char* out_string;<br />
	char *substring=", ";<br />
	int position=0;<br />
	bool result=false;<br />
	do<br />
	{<br />
		cout<<prompt; cinFlush;<br />
		//cin>>string;<br />
		//cin.get();<br />
		cin.getline(string,MAX_SIZE);<br />
		if (strstr(string,substring) == NULL)<br />
		{<br />
			cout<<"Invalid Name(substring ', ' not found into the string)"<<endl;<br />
			result=false;<br />
		}<br />
		else<br />
		{<br />
			position=strstr(string,substring) - string;<br />
			if (position == 0)<br />
			{<br />
				cout<<"Invalid Name(substring ', ' found in the beginning of the string)"<<endl;<br />
				result=false;<br />
			}<br />
			else if (toascii(string[position + 1]) == 32 && string[position + 2] == '\0')<br />
			{<br />
				cout<<"Invalid Name(substring ', ' found at the end of the string)"<<endl;<br />
				result=false;<br />
			}<br />
			else<br />
			{<br />
				for(int j=0; j<position; j++)<br />
					if ((toascii(string[j]) >= 0 && toascii(string[j]) <= 64)<br />
						|| (toascii(string[j]) >= 91 && toascii(string[j]) <= 96)<br />
						|| (toascii(string[j]) >= 123 && toascii(string[j]) <= 127))<br />
					{<br />
						cout<<"Invalid character(s) found before the substring ', '"<<endl;<br />
						result=false;<br />
						break;<br />
					}<br />
					else<br />
					{<br />
						for(int m=position + 2; m<strlen(string); m++)<br />
							if ((toascii(string[m]) >= 0 && toascii(string[m]) <= 64)<br />
								|| (toascii(string[m]) >= 91 && toascii(string[m]) <= 96)<br />
								|| (toascii(string[m]) >= 123 && toascii(string[m]) <= 127))<br />
							{<br />
								result=false;<br />
								break;<br />
							}<br />
							else<br />
								result=true;<br />
					}<br />
<br />
			}<br />
		}<br />
		}while(!result && !cin.eof());<br />
		out_string=new char [strlen(string)+1];<br />
		if (out_string)<br />
			strcpy(out_string,string);<br />
		return out_string;<br />
}<br />
<br />
<br />
char* get_string_ver2 (char* prompt)<br />
{<br />
	const int MAX_SIZE=100;<br />
	char string[MAX_SIZE];<br />
	char* out_string;<br />
	char *substring=", ";//new<br />
	int position=0;//new<br />
	bool result=false;//new<br />
	do//new<br />
	{//new<br />
		cout<<prompt; cinFlush;<br />
		//cin>>string;<br />
		//cin.get();<br />
		cin.getline(string,MAX_SIZE);<br />
		if (strstr(string,substring) == NULL)<br />
		{<br />
			cout<<"Invalid String(substring ', ' not found into the string)"<<endl;<br />
			result=false;<br />
		}<br />
		else<br />
		{<br />
			position=strstr(string,substring) - string;<br />
			if (position == 0)<br />
			{<br />
				//cout<<"Substring found at position: "<<position<<endl;<br />
				cout<<"Invalid String(substring ', ' found in the beginning of the string)"<<endl;<br />
				result=false;<br />
			}<br />
			else if (toascii(string[position + 1]) == 32 && string[position + 2] == '\0')<br />
			{<br />
				//cout<<"Substring found at position: "<<position<<endl;<br />
				cout<<"Invalid String(substring ', ' found at the end of the string)"<<endl;<br />
				result=false;<br />
			}<br />
			else<br />
			{<br />
				for(int z=0;z<position; z++)<br />
					if  (!(( toascii(string[z]) > 64 && toascii(string[z]) < 91 ) <br />
						|| ( toascii(string[z]) > 96 && toascii(string[z]) < 123)<br />
						|| ( toascii(string[z]) == 32)))<br />
					{<br />
						cout<<"Invalid character(s) found before the substring"<<endl;<br />
						result=false;<br />
						break;<br />
					}<br />
					else<br />
					{<br />
						for(int m=position + 2; m<strlen(string); m++)<br />
							if (!(( toascii(string[z]) > 64 && toascii(string[z]) < 91 ) <br />
						       || ( toascii(string[z]) > 96 && toascii(string[z]) < 123)<br />
						       || ( toascii(string[z]) == 32)))<br />
							{<br />
								result=false;<br />
								break;<br />
							}<br />
							else<br />
								result=true;<br />
					}<br />
<br />
			}<br />
		}<br />
		}while(!result);<br />
		out_string=new char [strlen(string)+1];<br />
		if (out_string)<br />
			strcpy(out_string,string);<br />
		return out_string;<br />
}<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
void hold_screen()<br />
{<br />
	char ch;<br />
<br />
	cout << "hit enter to continue" << endl;<br />
	cin.get(ch);<br />
}<br />
<br />
void prompt_to_quit()<br />
{<br />
	char ch;<br />
<br />
	cout << "hit enter to quit" << endl;<br />
	cin.get(ch);	<br />
}<br />

<br />
//utility.h<br />
#ifndef _UTILITY<br />
#define _UTILITY<br />
/* prompts for a string, checks for the existence of <br />
   the substring ', ' and for valid characters before <br />
   and after the substring and finally dynamically <br />
   allocates space to store the string, returns the <br />
   pointer to the allocated storage or 0 if the allocation fails */<br />
char* get_string (char* prompt);<br />
<br />
/* prompts for a string, checks for the existence of <br />
   the substring ', ' and for valid characters before <br />
   and after the substring and finally dynamically <br />
   allocates space to store the string, returns the <br />
   pointer to the allocated storage or 0 if the allocation fails */<br />
char* get_string_ver2(char* prompt);<br />
<br />
/* prompts for a carriage return character to hold<br />
   window on display before program continues */<br />
void hold_screen();<br />
<br />
/* prompts for a carriage return character to hold<br />
   window on display before program ends */<br />
void prompt_to_quit();<br />
<br />
/* prompts for a string up to 100 characters<br />
   and checks whether the string characters are all alphabetical<br />
   returns either true or false. */<br />
//bool validateInput(char *input);<br />
<br />
#endif<br />

and finally

<br />
//main()<br />
#include <iostream><br />
#include "List.cpp"<br />
#include "Association.cpp"<br />
#include "AssociationList.h"<br />
#include "AssociationList.cpp"<br />
#include "Book.h"<br />
#include <conio.h><br />
#include "Member.h"<br />
#include "utility.h"<br />
#define cinFlush cin.seekg(ios::end)<br />
using namespace std;<br />
<br />
void main()<br />
{<br />
	List<Member>member1;<br />
	List<Book>book1;<br />
	char menuChoice;<br />
	do<br />
	{<br />
		cout<<'\n';<br />
		cout<<'\n';<br />
		cout<<"**** Main Menu ****"<<endl;<br />
		cout<<'\n';<br />
		cout<<"1: Add Book        "<<endl;<br />
		cout<<'\n';<br />
		cout<<"2: Remove Book     "<<endl;<br />
		cout<<'\n';<br />
		cout<<"3: Display Books   "<<endl;<br />
		cout<<'\n';<br />
		cout<<"4: Add Member      "<<endl;<br />
		cout<<'\n';<br />
		cout<<"5: Remove Member   "<<endl;<br />
		cout<<'\n';<br />
		cout<<"6: Display Members "<<endl;<br />
		cout<<'\n';<br />
		cout<<"7: Borrow Book     "<<endl;<br />
		cout<<'\n';<br />
		cout<<"8: Return Book     "<<endl;<br />
		cout<<'\n';<br />
		cout<<"0: Quit            "<<endl;<br />
		cout<<endl;<br />
		cout<<"Enter one of the above choices: ";cinFlush;<br />
		cin>>menuChoice;<br />
		switch(menuChoice)<br />
		{<br />
		case '1': cout<<'\n';<br />
                  book1.addElement("Books");<br />
			      break;<br />
		case '2': cout<<'\n';<br />
			      <br />
				  break;<br />
		case '3': cout<<'\n';<br />
			      book1.displayElement("Books");<br />
				  break;<br />
		case '4': cout<<'\n';<br />
			      //member1.addElement("Member");<br />
				  break;<br />
		case '5': cout<<'\n';<br />
			      <br />
				  break;<br />
		case '6': cout<<'\n';<br />
			      //member1.displayElement("Member");<br />
				  break;<br />
		case '7': cout<<'\n';<br />
			      //book1.borrowElement();<br />
				  break;<br />
		case '8': cout<<'\n';<br />
			      //book1.returnElement();<br />
				  break;<br />
		default:  cout<<'\n';<br />
			      cout<<"Invalid Selection\n";<br />
		}<br />
	}while(menuChoice != '0' && !cin.eof());<br />
	prompt_to_quit();<br />
}<br />

What I want to do is to use one function for displaying members and books (to use a template). 
What needs to be changed to use only one function for displaying members and books?

Regards,
grscot

Could you cut down your code example and format it better? Do you expect someone to read all that code?

//structure.cpp
#include <iostream>
using namespace std;

struct item
{
char name[35];
int price;
};

int main()

{

item ksoh =
{
"kings sword of haste",
25,000
};

item gpow =
{
"godly plate of the whale",
278,000
};
item demonspike =
{
"legit demonspike",
492,000
};
cout << "garth's equipment shoppe\n";
cout << "how about a nice " << ksoh.name << "for a mere ";
cout << ksoh.price <<"?\n";
cout << "or\n";
cout << "a high ac " << demonspike.name;
cout << " for only " << demonspike.price;
cout << " could really liven things up when laz is in the house. ";
cout << " be sure to take special note of our 2fer special today: ";
cout << "a " << ksoh.name << " and a burly ";
cout << gpow.name << " would most certainly be essential ";
cout << "if you plan on doing anything significant beyond level 12.";
cout << " on sale today only, a 2fer special of ";
cout << ksoh.price + gpow.price cout << "!!\n ";

}

And your question is?

preceding is some code I can't get to work. It's a simple structure
I've created and there doesn't seem to be any difference at all with
it and the one in the book I'm studying other than i've got 3
structure variables and the book's example has 2. My only clue is the
book mentions that external structure declaration is necessary to
allow all functions that follow to use it. I did that to start with
and tried placing it inside main as well; coming up with the same
error each time. ms visual studio.net is what I'm using the error I'm
getting is "structure error LNK2019: unresolved external symbol _main
referenced in function _mainCRTStartup" the help on this error isn't
much help to me, it's just too cryptic for me to apply to my problem.
Sorry if this is a really easy problem, it seems like it should be,
but I can't get it to work...

dont u have to do it like

struct item ksoh{
"kings sword of haste",
25,000
};

struct item gpow =
{
"godly plate of the whale",
278,000
};
struct item demonspike =
{
"legit demonspike",
492,000
};

i tried your suggestion, it gave me a bunch of "too many intializer" errors. I think using struct creates a structure each time you do it... oh, I created a profile fyi

This works fine for me:

struct item
{
    char name[35];
    int price;
};

void main( void )
{
    item ksoh =
    {
        "kings sword of haste",
        25000
    };

    item gpow =
    {
        "godly plate of the whale",
        278000
    };

    item demonspike =
    {
        "legit demonspike",
        492000
    };

    cout << "garth's equipment shoppe\n";
    cout << "how about a nice " << ksoh.name << "for a mere ";
    cout << ksoh.price <<"?\n";
    cout << "or\n"; 
    cout << "a high ac " << demonspike.name;
    cout << " for only " << demonspike.price;
    cout << " could really liven things up when laz is in the house. ";
    cout << " be sure to take special note of our 2fer special today: ";
    cout << "a " << ksoh.name << " and a burly "; 
    cout << gpow.name << " would most certainly be essential ";
    cout << "if you plan on doing anything significant beyond level 12.";
    cout << " on sale today only, a 2fer special of "; 
    cout << ksoh.price + gpow.price;
    cout << "!!\n ";
}

that did it. comma's in the integer values (something I threw
in because of the other error and never took out). and my last line
statement had an extra cout in it. after I fixed those things it worked fine. Still no idea where the other error came from, or why. I spent forever trying to figure it out and it was a fluke. *frustration* I think I'll re-install, I've had some other unusual problems with it opening up a dos console with no output and then adding the output in the console on a successive build with no changes. Thank you very much for your posts, i appreciate your time!

I'm trying to adjust my program so it runs in silent mode, meaning it does the work without opening up the main window for the user to click.
I have the following code in my InitInstance function: This code does go to silent mode, but I need to adjust it a bit.

When I get the command line, I want to be able to see if the lpszCmd is "/s",
then run in silent mode, else, run in regular mode(open up the main window).

I dont know how to adjust my program to do that. Is it possible?

BOOL command_line_keys_detected;
LPSTR lpszCmd=GetCommandLine();

// parse lpszCmd
if(command_line_keys_detected)
{
// do all your tasks here

CMainFrame* main = dynamic_cast<cmainframe*>(m_pMainWnd);
main->GetCheckedItems();

CFileProgress dlgPrg;
dlgPrg.DoModal();

return FALSE;

}

Look at the CCommandLineInfo class. Its ParseParam() method can be overridden to handle your app's specific needs.

Could anyone give me a code sniplet of how to pass an array of structures (user-defined types) from VBA to a C++ dll. The structure contains various data types: longs, doubles, floats, as well as byte arrays.

Thank you.

Hi guys,

I was wondering if anyone was successful in changing the height of a header in CListCtrl without Subclassing.

I tried this recommeded method, but did not work as it keeps adjusting the column width and not the height

void CTestListCtrl::SetHeadersHeight( int Height )
{
HDITEM pHeaderItem;

CHeaderCtrl* m_npheader = GetHeaderCtrl();
pHeaderItem.mask = HDI_TEXT | HDI_HEIGHT | HDI_FORMAT | HDI_ORDER;
if( m_npheader->GetItem(0, &pHeaderItem) == FALSE )
return;
pHeaderItem.cxy = Height;
m_npheader->SetItem(0, &pHeaderItem);
}

say I have a class named MyNewClass
this is how the MyNewClass.h looks

<br />
typedef struct udt{<br />
        int val1;<br />
        void * thisObj;<br />
}pair ;<br />
<br />
<br />
class MyNewClass {<br />
<br />
<br />
<br />
public :<br />
          static  pair pairTable[20];<br />
          static  int pairCount;<br />
};<br />
<br />
<br />
this is how MyNewClass.cpp looks like    <br />
<br />
#include "MyNewClass.h"<br />
<br />
<br />
int MyNewClass::pairCount=0;<br />
<br />
static MyNewClass * GetThisObject(int val1)<br />
{<br />
          // using pairTable like <br />
           MyNewClass::pairTable[MyNewClass::pairCount].val1<br />
..<br />
}<br />
<br />
<br />
MyNewClass ::MyNewClass(){<br />
<br />
     pairTable[pairCount++].thisObj=(void *) this ;<br />
}

I am getting linking error becaus of the line in the constructor !!! What am i doing wrong here ? Please help

The help text for C2600 pretty much sums it up: your class is missing a default constructor.

class MyNewClass 
{
public :
    MyNewClass();    

    static pair pairTable[20];
    static int pairCount;
};

Sorry I forgot to mention , my class does have the constructor specified in the .cpp file .

Have you defined pairTable in the cpp file as:

pair MyNewClass::pairTable[20];

If you haven't, it will probably result in an unresolved external linker error. If this isn't the problem, post what the actual linker error is - it might make it a bit easier to solve.

Dave
http://www.cloudsofheaven.org

Thanks I just had to do that . Having done this I'd like to know why this is essential !