File-Based Applications: Bethesda Car Rental

	Bethesda Car Rental: Cars Records

Introduction

Cars are at the center of the rental transactions of our company. A car is the main reason a customer comes to the business. In our application, we will provide all the necessary information related to a car such as its make, model, year, picture, and whether it is available. Because we know that sometimes when renting or choosing a car, a customer may want to know the options available on a particular car, we will also list these basic pieces of information. Finally, we will mark a car as available or not. This will allow the clerk processing an order to know whether the customer can rent the car or not.

We will create two forms related to cars. One form will be used to enter a new car when the company acquires one. On the other hand, when interviewing a customer, if the clerk wants to see a list of the company cars, we will create a form that can help with this, allowing the clerk to navigate among cars for a review.

Practical Learning: Processing Cars

Copy the following pictures to the folder of the current project (Save them with their default names):
Return to your programming environment
To add a new form to the application, on the main menu, click Project -> Add New Item...
In the Templates list of the Add New Item dialog box, click Windows Forms (.NET)
Set the Name to NewCar and press Enter

Design the form as follows:

Control	Text	Name	Other Properties
Label	Text #
TextBox		txtTagNumber
Label	Make:
TextBox		txtMake
Label	Model:
TextBox		txtModel
Label	Year:
TextBox		txtYear
Label	Category:
ComboBox		cboCategory	DropDownStyle: DropDownList
ComboBox		cboCategory	Items:	Economy Compact Standard Full Size Mini Van SUV Truck Van
CheckBox	Cassete Player	chkK7Player	CheckAlign: MiddleRight
CheckBox	DVD Player	chkDVDPlayer	CheckAlign: MiddleRight
CheckBox	CD Player	chkCDPlayer	CheckAlign: MiddleRight
CheckBox	Available	chkAvailable	CheckAlign: MiddleRight
PictureBox		pctCar	SizeMode: CenterImage
Label	Select Car Picture:
ComboBox	none.gif	cboPictures
Button	Add Car	btnAddCar
Button	Close	btnClose	DialogResult: OK
Form			FormBorderStyle: FixedDialog MaximizeBox: False MinimizeBox: False ShowInTaskbar: False

To add a new class to the project, on the main menu, click Project -> Add Class...
In the Templates list, click Generic C++ Class and click Open
Set the Class Name to CCar and click Finish

Access the Car.h file and change it as follows:

#pragma once

using namespace System;

[Serializable]
__sealed public __gc class CCar
{
public:
	String *TagNumber;
	String *Make;
	String *Model;
	int     Year;
	String *Category;
	int    HasK7Player;
	int    HasCDPlayer;
	int    HasDVDPlayer;
	String *PictureName;
	int    IsAvailable;

public:
	CCar(void);
	CCar(String *tag, String *mk, String *mdl, 
		 int Year, String *cat, int k7, int cd,
		 int dvd, String *pct, int avl);
	~CCar(void);
};

Change the Car.cpp file as follows:

#include "StdAfx.h"
#include ".\car.h"
#using <mscorlib.dll>

CCar::CCar(void)
{
	TagNumber    = S"000-000";
	Make         = S"Make";
	Model        = S"Model";
	Year         = 1960;
	Category     = S"Small";
	HasK7Player  = 0;
	HasCDPlayer  = 0;
	HasDVDPlayer = 0;
	PictureName  = "";
	IsAvailable  = 0;
}
CCar::CCar(String *tag, String *mk, String *mdl, 
		 int yr, String *cat, int k7, int cd,
		 int dvd, String *pct, int avl)
{
	TagNumber    = tag;
	Make         = mk;
	Model        = mdl;
	Year         = yr;
	Category     = cat;
	HasK7Player  = k7;
	HasCDPlayer  = cd;
	HasDVDPlayer = dvd;
	PictureName  = pct;
	IsAvailable  = avl;
}

CCar::~CCar(void)
{
}

Display the NewCar form. Right-click it and click View Code

In the top section of the file, type the following:

#pragma once

#using <System.Runtime.Serialization.Formatters.Soap.dll>

#include "Car.h"

using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;
using namespace System::IO;
using namespace System::Runtime::Serialization::Formatters::Soap;

namespace BCR2
{

Declare an ArrayList variable and name it lstCars:

private:
		/// <summary>
		/// Required designer variable.
		/// </summary>
		System::ComponentModel::Container * components;
		ArrayList *lstCars;

Return to the NewCar form. Double-click an unoccupied area of its body to generate its Load event and implement it as follows:

System::Void NewCar_Load(System::Object *  sender, System::EventArgs *  e)
{
	 lstCars = new ArrayList;
	 String *strFilename = S"Cars.bcr";
	 SoapFormatter *bcrSoap = new SoapFormatter();
			 
	 if( File::Exists(strFilename) )
	 {
FileStream *bcrStream = new FileStream(strFilename, FileMode::Open, FileAccess::Read, FileShare::Read);
		 lstCars = dynamic_cast<ArrayList *>(bcrSoap->Deserialize(bcrStream));

		 bcrStream->Close();
	 }
	 else
	 {
  FileStream *bcrStream = new FileStream(strFilename, FileMode::OpenOrCreate, FileAccess::Write, FileShare::Write);
			 bcrSoap->Serialize(bcrStream, lstCars);
			 bcrStream->Close();
	 }

	 // Locate the director that contains the current application
	 DirectoryInfo* di = new DirectoryInfo(S".\\");

    	// Get a reference to each file in that directory
    	FileInfo* fiArr[] = di->GetFiles();

	// Display the names of the graphics files
	for(int i = 0; i < fiArr->Count; i++)
	{
		if( fiArr[i]->Extension->Equals(S".gif") ||
			fiArr[i]->Extension->Equals(S".jpeg") ||
			fiArr[i]->Extension->Equals(S".jpg") ||
			fiArr[i]->Extension->Equals(S".bmp") ||
			fiArr[i]->Extension->Equals(S".png") )
			cboPictures->Items->Add(fiArr[i]->Name);
    }

	cboPictures->Text = S"none.gif";
}

Return to the NewCar form and double-click the combo box on then right side of Select Car Picture

Implement its SelectedIndexChanged event as follows:

System::Void cboPictures_SelectedIndexChanged(System::Object *  sender, System::EventArgs *  e)
{
	 this->pctCar->Image = Image::FromFile(cboPictures->Text);
}

Return to the NewCar form and double-click the Add Car button to generate its Click event

Implement it as follows:

System::Void btnAddCar_Click(System::Object *  sender, System::EventArgs *  e)
		 {
	 CCar *car = new CCar;

	 car->TagNumber = this->txtTagNumber->Text;
	 car->Make      = this->txtMake->Text;
	 car->Model     = this->txtModel->Text;
	 car->Year      = this->txtYear->Text->ToInt32(0);
	 car->Category  = this->cboCategory->Text;
	 if( this->chkK7Player->Checked == true )
		 car->HasK7Player  = 1;
	 else
		 car->HasK7Player  = 0;
	 if( this->chkCDPlayer->Checked == true )
		 car->HasCDPlayer  = 1;
	 else
		 car->HasCDPlayer  = 0;
	 if( this->chkDVDPlayer->Checked == true )
		 car->HasDVDPlayer = 1;
	 else
		 car->HasDVDPlayer = 0;
	 car->PictureName  = cboPictures->Text;
	 if( this->chkAvailable->Checked == true )
		 car->IsAvailable  = 1;
	 else
		 car->IsAvailable  = 0;

	 lstCars->Add(car);

	 String *strFilename = S"Cars.bcr";
	 SoapFormatter *bcrSoap = new SoapFormatter();
  FileStream *bcrStream = new FileStream(strFilename, FileMode::OpenOrCreate, FileAccess::Write, FileShare::Write);
			 bcrSoap->Serialize(bcrStream, lstCars);
			 bcrStream->Close();

			 this->txtTagNumber->Text = S"";
			 this->txtMake->Text      = S"";
			 this->txtModel->Text     = S"";
			 this->txtYear->Text      = S"1960";
			 this->cboCategory->SelectedIndex = 0;
			 this->chkK7Player->Checked = false;
			 this->chkCDPlayer->Checked  = false;
			 this->chkDVDPlayer->Checked = false;
			 cboPictures->Text = S"none.gif";			 
			 this->chkAvailable->Checked = false;
			 this->pctCar->Image = Image::FromFile(S"none.gif");
			 this->txtTagNumber->Focus();
}

Display the first form, Form1.h [Design]. Add a Button to the form and change its properties as follows:
(Name): btnNewCar
Text: New Car
Double-click the New Car button to generate its Click event
In the top section of the file and under the #pragma once line, type

#include "NewCar.h"

Implement the event as follows:

System::Void btnNewCar_Click(System::Object *  sender, System::EventArgs *  e)
{
	 NewCar *dlgCar = new NewCar;	 
	 dlgCar->ShowDialog();
}

Execute the application
Create a few cars as follows:
Close the forms and return to your programming environment
To add a new form to the application, on the main menu, click Project -> Add New Item...
In the Templates list of the Add New Item dialog box, click Windows Forms (.NET)
Set the Name to Cars and press Enter

Design the form as follows:

Control	Text	Name	Other Properties
Label	Make:
TextBox		txtMake
Label	Model:
TextBox		txtModel
Label	Year:
TextBox		txtYear
Label	Category:
TextBox		txtCategory
CheckBox	Cassete Player	chkK7Player	CheckAlign: MiddleRight
CheckBox	DVD Player	chkDVDPlayer	CheckAlign: MiddleRight
CheckBox	CD Player	chkCDPlayer	CheckAlign: MiddleRight
CheckBox	Available	chkAvailable	CheckAlign: MiddleRight
Label	Tag #:
TextBox		txtTagNumber
PictureBox		pctCar
Button	First	btnFirst
Button	Previous	btnPrevious
Button	Next	btnNext
Button	Last	btnLast
Button	Close	btnClose
Form			MaximizeBox: False StartPosition: CenterScreen

Right-click the form and click View Code

In the top section of the file, type the following:

#pragma once

#include "Car.h"

#using <System.Runtime.Serialization.Formatters.Soap.dll>

using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;
using namespace System::IO;
using namespace System::Runtime::Serialization::Formatters::Soap;

In the class, declare a pointer to ArrayList and name it lstCars:

private:
		/// <summary>
		/// Required designer variable.
		/// </summary>
		System::ComponentModel::Container* components;
		ArrayList *lstCars;
		int CurrentPosition;

Return to the Cars form and double- click an empty area of its body

Implement the event as follows:

System::Void Cars_Load(System::Object *  sender, System::EventArgs *  e)
{
	 lstCars = new ArrayList();
	 CurrentPosition = 0;
	 
	 String *strFilename = S"Cars.bcr";
	 SoapFormatter *bcrSoap = new SoapFormatter();
			 
	 if( File::Exists(strFilename) )
	 {
		FileStream *bcrStream = new FileStream(strFilename, 
						FileMode::Open,
						FileAccess::Read, 
						FileShare::Read);
		 lstCars = dynamic_cast<ArrayList *>(bcrSoap->Deserialize(bcrStream));

		 bcrStream->Close();
		 this->btnFirst_Click(sender, e);
	 }
}

void ShowCarInformation(CCar *car)
{
	 this->txtTagNumber->Text = car->TagNumber;
	 this->txtMake->Text = car->Make;
	 this->txtModel->Text = car->Model;
	 this->txtYear->Text  = car->Year.ToString();
	 this->txtCategory->Text  = car->Category;

	 if( car->HasK7Player == 1 )
		 this->chkK7Player->Checked = true;
	 else
		 this->chkK7Player->Checked = false;

	 if( car->HasCDPlayer == 1 )
		 this->chkCDPlayer->Checked = true;
	 else
		 this->chkCDPlayer->Checked = false;

	 if( car->HasDVDPlayer == 1 )
		 this->chkDVDPlayer->Checked = true;
	 else 
		 this->chkDVDPlayer->Checked = false;

	 String *strPictureName = car->PictureName;

	 try {
		 this->pctCar->Image = Image::FromFile(car->PictureName);
	 }
	 catch(OutOfMemoryException *)
	 {
		 this->pctCar->Image = Image::FromFile(S"none.gif");
	 }

	 if( car->IsAvailable == 1 )
		 this->chkAvailable->Checked = true;
	 else
		 this->chkAvailable->Checked = false;
}

Return to the Cars form and double-click the First button

Implement its Click event as follows:

System::Void btnFirst_Click(System::Object *  sender, System::EventArgs *  e)
{
	 if( lstCars->Count == 0 )
		 return;
			 
	 CurrentPosition = 0;
	 CCar *car = new CCar();

	 car = dynamic_cast<CCar *>(this->lstCars->Item[CurrentPosition]);

	ShowCarInformation(car);
}

Return to the Cars form

Double-click the Previous button and implement its Click event as follows:

private: System::Void btnPrevious_Click(System::Object *  sender, System::EventArgs *  e)
{
	 if( lstCars->Count == 0 )
		 return;
			 
	 if( CurrentPosition == 0 )
		 return;
	 
	 CurrentPosition--;
	 CCar *car = new CCar();

	 car = dynamic_cast<CCar *>(lstCars->Item[CurrentPosition]);

	ShowCarInformation(car);
}

Return to the Cars form. Double-click the Next button and implement its Click event as follows:

private: System::Void btnNext_Click(System::Object *  sender, System::EventArgs *  e)
{
	 if( lstCars->Count == 0 )
		 return;

	 if( CurrentPosition == lstCars->Count - 1 )
		 return;
	 else
	 {
	 CurrentPosition++;
	 
	 CCar *car = new CCar();

	 car = dynamic_cast<CCar *>(lstCars->Item[CurrentPosition]);

	ShowCarInformation(car);
	 }
}

Return to the Cars form. Double-click the Last button and implement its Click event as follows:

private: System::Void btnLast_Click(System::Object *  sender, System::EventArgs *  e)
{
	 if( lstCars->Count == 0 )
		 return;
			 
	 CurrentPosition = lstCars->Count - 1;
	 CCar *car = new CCar();

	 car = dynamic_cast<CCar *>(this->lstCars->Item[CurrentPosition]);

	ShowCarInformation(car);
}

Return to the Cars form. Double-click the Close button and implement its Click event as follows:

private: System::Void btnClose_Click(System::Object *  sender, System::EventArgs *  e)
{
	 Close();
}

Display the first form, Form1.h [Design]. Add a Button to the form and change its properties as follows:
(Name): btnCarsReview
Text: Cars Review
Double-click the New Car button to generate its Click event
In the top section of the file and under the #pragma once line, type

#include "Cars.h"

Implement the event as follows:

System::Void btnCarsReview_Click(System::Object *  sender, System::EventArgs *  e)
{
	 Cars *frmCars = new Cars;
	 frmCars->Show();
}

Execute the application and review the list of cars using the Cars form
Close the forms and return to your programming environment


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