Visual C++ .NET Examples: Object Serialization

	MS Visual C++ .NET Applications: Georgetown Cleaning Services

Introduction to Serialization

This application follows the Georgetown Cleaning Services that was primarily used to demonstrate the use of various Windows controls such as the date picker, the time picker, and bitmap buttons. One of the issues that was not dealt with was the ability to save the customers orders.

In this application, after a customer's order has been processed, we will allow the user to save it.

Practical Learning: Introducing File-Based Databases

Start a new Windows Forms Application named GCS3
To add a new form, 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 NewCleaningOrder and press Enter
Set the form's icon to Drive:\Program Files\Microsoft Visual Studio .NET 2003\Common7\Graphics\icons\Writing\NOTE16.ICO
On the main menu, click Project -> Add Resource...
In the Add Resource dialog box, double-click Icon
In the Class View, click IDI_ICON1
In the Properties window, change the filename to Calculate.ico and change the ID to IDI_CALCULATE
Right-click a white area in the drawing section and click New Image Type...
In the New Icon Image Type dialog box, double-click 16x16, 16 Colors
Design it as follows:
Right-click a white area in the drawing section, position the mouse on Current Icon Image Types, and click 32x32, 16 Colors
Right-click a white area in the drawing section and click Delete Image Type
Save the icon
On the main menu, click Project -> Add Resource...
In the Add Resource dialog box, click Icon and click New
In the Class View, click IDI_ICON2
In the Properties window, change the filename to SubTotal.ico and change the ID to IDI_SUBTOTAL
Right-click a white area in the drawing section and click New Image Type...
In the New Icon Image Type dialog box, double-16x16, 16 Colors
Design the icon as follows:
Right-click a white area in the drawing section, position the mouse on Current Icon Image Types, and click 32x32, 16 Colors
Right-click a white area in the drawing section and click Delete Image Type
Save the icon

Return to the form (Form1.h [Design]) and design it as follows:

Control	Name	Text	Additional Properties
GroupBox		Order Identification
Label		Customer Name:
TextBox	txtCustomerName
Label		Date Left:
DateTimePicker	dtpDateLeft		Format: Custom Custom Format: dddd dd MMM yyyy
Label		Time Left:
DateTimePicker	dtpTimeLeft		Format: Time
Label		Date Expected:
DateTimePicker	dtpDateExpected		Format: Custom Custom Format: dddd dd MMM yyyy
Label		Time Expected:
DateTimePicker	dtpTimeExpected		Format: Time
GroupBox		Order Processing
Label		Item Type
Label		Unit Price
Label		Qty
Label		Sub Total
Label		Shirts
TextBox	txtShirtsUnitPrice	0.95	TextAlign: Right
TextBox	txtShirtsQuantity	0	TextAlign: Right
Button	btnCalcShirts		Image: SubTotal.ico
TextBox	txtShirtsSubTotal	0.00	TextAlign: Right
Label		Pants
TextBox	txtPantsUnitPrice	2.75	TextAlign: Right
TextBox	txtPantsQuantity		TextAlign: Right
Button	btnCalcPants		Image: SubTotal.ico
TextBox	txtPantsSubTotal	0.00	TextAlign: Right
ComboBox	cboItem1	None
TextBox	txtItem1UnitPrice	0.00	TextAlign: Right
TextBox	txtItem1Quantity	0	TextAlign: Right
Button	btnCalcItem1		Image: SubTotal.ico
TextBox	txtItem1SubTotal	0.00	TextAlign: Right
ComboBox	cboItem2	None
TextBox	txtItem2UnitPrice	0.00	TextAlign: Right
TextBox	txtItem2Quantity	0	TextAlign: Right
Button	btnCalcItem2		Image: SubTotal.ico
TextBox	txtItem2SubTotal	0.00	TextAlign: Right
ComboBox	cboItem3	None
TextBox	txtItem3UnitPrice	0.00	TextAlign: Right
TextBox	txtItem3Quantity	0	TextAlign: Right
Button	btnCalcItem3		Image: SubTotal.ico
TextBox	txtItem3SubTotal	0.00	TextAlign: Right
ComboBox	cboItem4	None
TextBox	txtItem4UnitPrice	0.00	TextAlign: Right
TextBox	txtItem4Quantity	0	TextAlign: Right
Button	btnCalcItem4		Image: SubTotal.ico
TextBox	txtItem4SubTotal	0.00	TextAlign: Right
Button	btnCalculate	Calculate
GroupBox		Order Summary
Label		Cleaning Total:
TextBox	txtOrderTotal	0.00	TextAlign: Right
Label		Tax Rate:
TextBox	txtTaxRate	5.75	TextAlign: Right
Label		%
Label		Tax Amount:
TextBox	txtTaxAmount	0.00	TextAlign: Right
Label		Order Total:
TextBox	txtOrderPrice	0.00	TextAlign: Right
GroupBox		Maintenance
Label		Save this order in
DateTimePicker	dtpDateProcessed		Format: Custom CustomFormat: dd MMM yyyy
Button	btnSave	Save
Button	btnNewOrder	Start New Cleaning Order
Button	btnClose	Close

Click each combo box. Access its Items property and fill it up as follows:
Click OK and save All

On the form, double-click the Time Left control and implement its ValueChanged event as follows:

private: System::Void dtpTimeLeft_ValueChanged(System::Object *  sender, System::EventArgs *  e)
{
	 DateTime dateLeft = this->dtpDateLeft->Value;
	 DateTime timeLeft = this->dtpTimeLeft->Value;

	 DateTime time9AM   = DateTime(timeLeft.Year, timeLeft.Month, timeLeft.Day, 9, 0, 0);

	 // If the customer leaves clothes before 9AM...
	 if( timeLeft <= time9AM )
	 {
		 // ... then they should be ready the same day after 5PM
		 this->dtpDateExpected->Value = dateLeft;
this->dtpTimeExpected->Value = DateTime(dateLeft.Year, dateLeft.Month, dateLeft.Day, 17, 0, 0);
	 }
	 else
	 {
	// If the clothese were left after 9AM, they will be availablethe following morning at 8AM
	 this->dtpDateExpected->Value = DateTime(dateLeft.Year, dateLeft.Month, dateLeft.Day + 1); 
 this->dtpTimeExpected->Value = DateTime(dateLeft.Year, dateLeft.Month, dateLeft.Day + 1, 8, 0, 0);
	 }
}

Return to the form. Double-click the button on the right side of the Shirts text box and implement its Click event as follows:

System::Void btnCalcShirts_Click(System::Object *  sender, System::EventArgs *  e)
{
	 int quantity = 1;
	 double unitPrice, subTotal;

	 // Retrieve the number of this item
// Just in case the user types an invalid value, we are using a try...catch
	 try {
		 quantity  = this->txtShirtsQuantity->Text->ToInt16(0);
	 }
	 catch(FormatException *)
	 {
 MessageBox::Show(S"The value you entered for the number of shirts is not valid"
			              S"\nPlease try again");
	 }

	 // Retrieve the unit price of this item
 // Just in case the user types an invalid value, we are using a try...catch
	 try {
		 unitPrice = this->txtShirtsUnitPrice->Text->ToDouble(0);
	 }
	 catch(FormatException *)
	 {
 MessageBox::Show(S"The value you entered for the price of shirts is not valid"
			              S"\nPlease try again");
	 }

	 // Calculate the sub-total for this item
	 subTotal  = quantity * unitPrice;

	 // Display the sub-total in the corresponding text box
	 this->txtShirtsSubTotal->Text = subTotal.ToString(S"F");
}

Return to the form. Double-click the button on the right side of the Pants text box and implement its Click event as follows:

System::Void btnCalcPants_Click(System::Object *  sender, System::EventArgs *  e)
{
	 int quantity = 1;
	double unitPrice, subTotal;

	try {
		quantity  = this->txtPantsQuantity->Text->ToInt16(0);
	}
	catch(FormatException *)
	{
MessageBox::Show(S"The value you entered for the number of pants is not valid"
			             S"\nPlease try again");
	}

	try {
		unitPrice = this->txtPantsUnitPrice->Text->ToDouble(0);
	}
	catch(FormatException *)
	{
MessageBox::Show(S"The value you entered for the price of pants is not valid"
			             S"\nPlease try again");
	}

	subTotal  = quantity * unitPrice;

	this->txtPantsSubTotal->Text = subTotal.ToString("F");
}

Return to the form. Double-click the button for the first combo box
Return to the form. Double-click the button for the second combo box
Return to the form. Double-click the button for the third combo box
Return to the form. Double-click the button for the fourth combo box

Implement their Click events as follows:

System::Void btnCalcItem1_Click(System::Object *  sender, System::EventArgs *  e)
{
	int quantity = 1;
	double unitPrice, subTotal;

	try {
		quantity  = this->txtItem1Quantity->Text->ToInt16(0);
	}
	catch(FormatException *)
	{
		MessageBox::Show(S"The value you entered is not valid"
			             S"\nPlease try again");
	}

	try {
		unitPrice = this->txtItem1UnitPrice->Text->ToDouble(0);
	}
	catch(FormatException *)
	{
		MessageBox::Show(S"The value you entered for the price is not valid"
			             S"\nPlease try again");
	}

	subTotal  = quantity * unitPrice;

	this->txtItem1SubTotal->Text = subTotal.ToString("F");
}

private: System::Void btnCalcItem2_Click(System::Object *  sender, System::EventArgs *  e)
{
	int quantity = 1;
	double unitPrice, subTotal;

	try {
		quantity  = this->txtItem2Quantity->Text->ToInt16(0);
	}
	catch(FormatException *)
	{
		MessageBox::Show(S"The value you entered is not valid"
			             S"\nPlease try again");
	}

	try {
		unitPrice = this->txtItem2UnitPrice->Text->ToDouble(0);
	}
	catch(FormatException *)
	{
		MessageBox::Show(S"The value you entered for the price is not valid"
			             S"\nPlease try again");
	}

	subTotal  = quantity * unitPrice;

	this->txtItem2SubTotal->Text = subTotal.ToString("F");
}

private: System::Void btnCalcItem3_Click(System::Object *  sender, System::EventArgs *  e)
{
	int quantity = 1;
	double unitPrice, subTotal;

	try {
		quantity  = this->txtItem3Quantity->Text->ToInt16(0);
	}
	catch(FormatException *)
	{
		MessageBox::Show(S"The value you entered is not valid"
			             S"\nPlease try again");
	}

	try {
		unitPrice = this->txtItem3UnitPrice->Text->ToDouble(0);
	}
	catch(FormatException *)
	{
		MessageBox::Show(S"The value you entered for the price is not valid"
			             S"\nPlease try again");
	}

	subTotal  = quantity * unitPrice;

	this->txtItem3SubTotal->Text = subTotal.ToString("F");
}

private: System::Void btnCalcItem4_Click(System::Object *  sender, System::EventArgs *  e)
{
	int quantity = 1;
	double unitPrice, subTotal;

	try {
		quantity  = this->txtItem4Quantity->Text->ToInt16(0);
	}
	catch(FormatException *)
	{
		MessageBox::Show(S"The value you entered is not valid"
			             S"\nPlease try again");
	}

	try {
		unitPrice = this->txtItem4UnitPrice->Text->ToDouble(0);
	}
	catch(FormatException *)
	{
		MessageBox::Show(S"The value you entered for the price is not valid"
			             S"\nPlease try again");
	}

	subTotal  = quantity * unitPrice;

	this->txtItem4SubTotal->Text = subTotal.ToString("F");
}

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

private: System::Void btnCalculate_Click(System::Object *  sender, System::EventArgs *  e)
{
	double priceShirts, pricePants,
		   priceItem1, priceItem2, priceItem3, priceItem4,
		   cleaningTotal;
	double taxRate, taxAmount;
	double orderTotal;

	// Just in case the user forgot to calculate the sub totals, do it now
	this->btnCalcShirts_Click(sender, e);
	this->btnCalcPants_Click(sender, e);
	this->btnCalcItem1_Click(sender, e);
	this->btnCalcItem2_Click(sender, e);
	this->btnCalcItem3_Click(sender, e);
	this->btnCalcItem4_Click(sender, e);

	// Retrieve the value of the sub-total for each category of items
	priceShirts  = this->txtShirtsSubTotal->Text->ToDouble(0);
	pricePants   = this->txtPantsSubTotal->Text->ToDouble(0);
	priceItem1 = this->txtItem1SubTotal->Text->ToDouble(0);
	priceItem2 = this->txtItem2SubTotal->Text->ToDouble(0);
	priceItem3 = this->txtItem3SubTotal->Text->ToDouble(0);
	priceItem4 = this->txtItem4SubTotal->Text->ToDouble(0);

	// Calculate the total
	cleaningTotal = priceShirts + pricePants + 
		         priceItem1 + priceItem2 + priceItem3 + priceItem4;

	// Retrieve the value of the tax rate
	try {
		taxRate = this->txtTaxRate->Text->ToDouble(0);
	}
	catch(FormatException *)
	{
		MessageBox::Show(S"The tax rate you entered is invalid"
			             S"\nPlease try again");
	}

	// Calculate the amount owed for the taxes
	taxAmount = cleaningTotal * taxRate / 100;
	// Add the tax amount to the total order
	orderTotal  = cleaningTotal + taxAmount;
			
	// Display the values of the order summary
	this->txtCleaningTotal->Text = cleaningTotal.ToString(S"F");
	this->txtTaxAmount->Text  = taxAmount.ToString(S"F");
	this->txtOrderTotal->Text   = orderTotal.ToString(S"F");
}

Return to the New Cleaning Order form and double the Start New Cleaning Order

Implement the event as follows:

private: System::Void btnNewOrder_Click(System::Object *  sender, System::EventArgs *  e)
{
	 this->txtCustomerName->Text = S"";
	 this->txtCustomerPhone->Text = S"";

	 this->txtShirtsUnitPrice->Text = S"0.95";
	 this->txtShirtsQuantity->Text  = S"0";
	 this->txtShirtsSubTotal->Text = S"0.00";

	 this->txtPantsUnitPrice->Text = S"2.75";
	 this->txtPantsQuantity->Text = S"0";
	 this->txtPantsSubTotal->Text = S"0.00";

	 this->txtItem1UnitPrice->Text = S"0.00";
	 this->txtItem1Quantity->Text = S"0";
	 this->txtItem1SubTotal->Text = S"0.00";

	 this->txtItem2UnitPrice->Text = S"0.00";
	 this->txtItem2Quantity->Text = S"0";
	 this->txtItem2SubTotal->Text = S"0.00";

	 this->txtItem3UnitPrice->Text = S"0.00";
	 this->txtItem3Quantity->Text = S"0";
	 this->txtItem3SubTotal->Text = S"0.00";

	 this->txtItem4UnitPrice->Text = S"0.00";
	 this->txtItem4Quantity->Text = S"0";
	 this->txtItem4SubTotal->Text = S"0.00";

	 this->txtCleaningTotal->Text = S"0.00";
	 this->txtTaxRate->Text = S"5.75";
	 this->txtTaxAmount->Text = S"0.00";
	 this->txtOrderTotal->Text = S"0.00";

	 this->txtCustomerName->Focus();
}

Return to the form

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

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

To add a new form, 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 CleaningOrders and press Enter

Design the form as follows:

Control	Name	Text	Additional Properties
Label		Open the order(s) processed on
DateTimePicker	dtpDateProcessed
GroupBox		Order Identification
Label		Customer Name:
TextBox	txtCustomerName
Label		Date Left:
DateTimePicker	dtpDateLeft		Format: Custom Custom Format: dddd dd MMM yyyy
Label		Time Left:
DateTimePicker	dtpTimeLeft		Format: Time
Label		Date Picked Up:
DateTimePicker	dtpDatePickedUp		Format: Custom Custom Format: dddd dd MMM yyyy
Label		Time Picked UP:
DateTimePicker	dtpTimePickedUp		Format: Time
GroupBox		Items Processed
Label		Item Type
Label		Unit Price
Label		Qty
Label		Sub Total
Label		Shirts
TextBox	txtShirtsUnitPrice	0.00	TextAlign: Right
TextBox	txtShirtsQuantity	0	TextAlign: Right
TextBox	txtShirtsSubTotal	0.00	TextAlign: Right
Label		Pants
TextBox	txtPantsUnitPrice	0.00	TextAlign: Right
TextBox	txtPantsQuantity		TextAlign: Right
TextBox	txtPantsSubTotal	0.00	TextAlign: Right
TextBox	txtItem1Name
TextBox	txtItem1UnitPrice	0.00	TextAlign: Right
TextBox	txtItem1Quantity	0	TextAlign: Right
TextBox	txtItem1SubTotal	0.00	TextAlign: Right
TextBox	txtItem2Name
TextBox	txtItem2UnitPrice	0.00	TextAlign: Right
TextBox	txtItem2Quantity	0	TextAlign: Right
TextBox	txtItem2SubTotal	0.00	TextAlign: Right
TextBox	txtItem3Name
TextBox	txtItem3UnitPrice	0.00	TextAlign: Right
TextBox	txtItem3Quantity	0	TextAlign: Right
TextBox	txtItem3SubTotal	0.00	TextAlign: Right
TextBox	txtItem4Name
TextBox	txtItem4UnitPrice	0.00	TextAlign: Right
TextBox	txtItem4Quantity	0	TextAlign: Right
TextBox	txtItem4SubTotal	0.00	TextAlign: Right
GroupBox		Order Summary
Label		Cleaning Total:
TextBox	txtCleaningTotal	0.00	TextAlign: Right
Label		Tax Rate:
TextBox	txtTaxRate	0.00	TextAlign: Right
Label		%
Label		Tax Amount:
TextBox	txtTaxAmount	0.00	TextAlign: Right
Label		Total Order:
TextBox	txtTotalOrder	0.00	TextAlign: Right
Button	btnClose	Close
GroupBox		Navigation
Button	btnFirst	First
Button	btnPrevious	Previous
Button	btnNext	Next
Button	btnLast	Last

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

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

Display the first form (Form1.h [Design]) and design it as follows:

Button Name	Button Text
btnNewOrder	New Cleaning Order
btnOrders	Open Existing Orders
btnClose	Close

Double-click the New Cleaning Order button
Return to the form and double-click the Open Existing Orders button
Return to the form and double-click the Close button

Implement the Click events as follows:

#pragma once

#include "NewCleaningOrder.h"
#include "CleaningOrders.h"

namespace GCS3
{
	. . . No Change
		
	private: System::Windows::Forms::Button *  btnNewOrder;
	private: System::Windows::Forms::Button *  btnOrders;
	private: System::Windows::Forms::Button *  btnClose;

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

		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		void InitializeComponent(void)
		{
			
			. . . No Change

		}	
private: System::Void btnNewOrder_Click(System::Object *  sender, System::EventArgs *  e)
		 {
			NewCleaningOrder *frmOrder = new NewCleaningOrder();
			 frmOrder->ShowDialog();
		 }

private: System::Void btnOrders_Click(System::Object *  sender, System::EventArgs *  e)
		 {
			 CleaningOrders *frmOrder = new CleaningOrders();
			 frmOrder->ShowDialog();
		 }

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

	};
}

Save all


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