Visual Basic Quesion: Write an application that tracks the amount of billable ti
ID: 641581 • Letter: V
Question
Visual Basic Quesion: Write an application that tracks the amount of billable time that the user spends on consulting projects. The application reads an input client file and appends information to a billing file, which it creates the first time it runs. Startup Form: When the user begins working on a project, the client name is selected from a ComboBox control. In Figure 1-25, the user has clicked the Start button, so the billing timer is running. Notice that the Start button is disabled. In Figure 1-26, the user has clicked the Stop button. At that moment, the application shows the amount of elapsed time and writes a record to the billing file.
Coordinate the command buttons carefully to make sure the user cannot click out of sequence. The following table shows the two possible program states that affect the buttons. The program is in State 1 when it starts; after clicking the Start button, the program enters State 2. When the Stop button is clicked, the program returns to State 1. State Start Stop Exit 1 Enabled Disabled Enabled 2 Disabled Enabled Disabled When the user clicks the Start button, display a status message Billing in Progress ... to show that the clock is running. Do not permit the user to select a different client while the clock is running. When the Stop button is clicked, display the stop time and the number of billable hours and minutes. The name of the selected client should appear in the window caption. TimeClock Class: Create a class named TimeClock that encapsulates the time-related calculations performed by the program. Use a TimeSpan object to hold the difference between two Date-Time values. The following table lists the TimeClock properties: Name Type Attributes Description StartTime DateTime ReadOnly StopTime DateTime ReadOnly Elapsed TimeSpan ReadOnly Duration between the starting and ending times ClientName String The following table lists the TimeClock methods: Name Return Type Attributes Description StartClock none public Begins the timing sequence StopClock none public Ends the timing sequence
BillingData Class: Create a class named BillingData to handle the client and billing files. Use the Visual Studio editor to create the client file. Insert at least five records in the client file before running the program. Each record in the client file contains a client name. Your program will create the billing file the first time it runs. Subsequent runs will append to the file.xEach record in the billing file contains the following fields: billing date, client name, start time, stop time, and elapsed time. The following is a sample record: 02-01-2003,Jones and Smith,21:51,22:10,1:19
Explanation / Answer
Client Billing
<?xml version="1.0" encoding="utf-8"?>
<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="4.0">
<PropertyGroup>
<ProjectType>Local</ProjectType>
<ProductVersion>8.0.50727</ProductVersion>
<SchemaVersion>2.0</SchemaVersion>
<ProjectGuid>{6989087F-E23E-4CBA-8AED-FFBEB8A2DFAF}</ProjectGuid>
<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
<ApplicationIcon>
</ApplicationIcon>
<AssemblyKeyContainerName>
</AssemblyKeyContainerName>
<AssemblyName>TimeClock</AssemblyName>
<AssemblyOriginatorKeyFile>
</AssemblyOriginatorKeyFile>
<AssemblyOriginatorKeyMode>None</AssemblyOriginatorKeyMode>
<DefaultClientScript>JScript</DefaultClientScript>
<DefaultHTMLPageLayout>Grid</DefaultHTMLPageLayout>
<DefaultTargetSchema>IE50</DefaultTargetSchema>
<DelaySign>false</DelaySign>
<OutputType>WinExe</OutputType>
<OptionCompare>Binary</OptionCompare>
<OptionExplicit>On</OptionExplicit>
<OptionStrict>Off</OptionStrict>
<RootNamespace>TimeClock</RootNamespace>
<StartupObject>TimeClock.Form1</StartupObject>
<FileUpgradeFlags>
</FileUpgradeFlags>
<MyType>WindowsFormsWithCustomSubMain</MyType>
<UpgradeBackupLocation>
</UpgradeBackupLocation>
<TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
<OldToolsVersion>2.0</OldToolsVersion>
<TargetFrameworkProfile />
<PublishUrl>publish</PublishUrl>
<Install>true</Install>
<InstallFrom>Disk</InstallFrom>
<UpdateEnabled>false</UpdateEnabled>
<UpdateMode>Foreground</UpdateMode>
<UpdateInterval>7</UpdateInterval>
<UpdateIntervalUnits>Days</UpdateIntervalUnits>
<UpdatePeriodically>false</UpdatePeriodically>
<UpdateRequired>false</UpdateRequired>
<MapFileExtensions>true</MapFileExtensions>
<ApplicationRevision>0</ApplicationRevision>
<ApplicationVersion>1.0.0.%2a</ApplicationVersion>
<IsWebBootstrapper>false</IsWebBootstrapper>
<UseApplicationTrust>false</UseApplicationTrust>
<BootstrapperEnabled>true</BootstrapperEnabled>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
<OutputPath>bin</OutputPath>
<DocumentationFile>TimeClock.xml</DocumentationFile>
<BaseAddress>285212672</BaseAddress>
<ConfigurationOverrideFile>
</ConfigurationOverrideFile>
<DefineConstants>
</DefineConstants>
<DefineDebug>true</DefineDebug>
<DefineTrace>true</DefineTrace>
<DebugSymbols>true</DebugSymbols>
<Optimize>false</Optimize>
<RegisterForComInterop>false</RegisterForComInterop>
<RemoveIntegerChecks>false</RemoveIntegerChecks>
<TreatWarningsAsErrors>false</TreatWarningsAsErrors>
<WarningLevel>1</WarningLevel>
<NoWarn>42016,42017,42018,42019,42032,42353,42354,42355</NoWarn>
<DebugType>full</DebugType>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
<OutputPath>bin</OutputPath>
<DocumentationFile>TimeClock.xml</DocumentationFile>
<BaseAddress>285212672</BaseAddress>
<ConfigurationOverrideFile>
</ConfigurationOverrideFile>
<DefineConstants>
</DefineConstants>
<DefineDebug>false</DefineDebug>
<DefineTrace>true</DefineTrace>
<DebugSymbols>false</DebugSymbols>
<Optimize>true</Optimize>
<RegisterForComInterop>false</RegisterForComInterop>
<RemoveIntegerChecks>false</RemoveIntegerChecks>
<TreatWarningsAsErrors>false</TreatWarningsAsErrors>
<WarningLevel>1</WarningLevel>
<NoWarn>42016,42017,42018,42019,42032,42353,42354,42355</NoWarn>
<DebugType>none</DebugType>
</PropertyGroup>
<ItemGroup>
<Reference Include="System">
<Name>System</Name>
</Reference>
<Reference Include="System.Data">
<Name>System.Data</Name>
</Reference>
<Reference Include="System.Drawing">
<Name>System.Drawing</Name>
</Reference>
<Reference Include="System.Windows.Forms">
<Name>System.Windows.Forms</Name>
</Reference>
<Reference Include="System.Xml">
<Name>System.XML</Name>
</Reference>
</ItemGroup>
<ItemGroup>
<Import Include="Microsoft.VisualBasic" />
<Import Include="System" />
<Import Include="System.Collections" />
<Import Include="System.Data" />
<Import Include="System.Diagnostics" />
<Import Include="System.Drawing" />
<Import Include="System.Windows.Forms" />
</ItemGroup>
<ItemGroup>
<Compile Include="AssemblyInfo.vb">
<SubType>Code</SubType>
</Compile>
<Compile Include="BillingData.vb">
<SubType>Code</SubType>
</Compile>
<Compile Include="frmMain.vb">
<SubType>Form</SubType>
</Compile>
<Compile Include="TimeClock.vb">
<SubType>Code</SubType>
</Compile>
<EmbeddedResource Include="frmMain.resx">
<DependentUpon>frmMain.vb</DependentUpon>
</EmbeddedResource>
</ItemGroup>
<ItemGroup>
<None Include="app.config" />
</ItemGroup>
<ItemGroup>
<Folder Include="My Project" />
</ItemGroup>
<ItemGroup>
<BootstrapperPackage Include="Microsoft.Net.Client.3.5">
<Visible>False</Visible>
<ProductName>.NET Framework 3.5 SP1 Client Profile</ProductName>
<Install>false</Install>
</BootstrapperPackage>
<BootstrapperPackage Include="Microsoft.Net.Framework.3.5.SP1">
<Visible>False</Visible>
<ProductName>.NET Framework 3.5 SP1</ProductName>
<Install>true</Install>
</BootstrapperPackage>
<BootstrapperPackage Include="Microsoft.Windows.Installer.3.1">
<Visible>False</Visible>
<ProductName>Windows Installer 3.1</ProductName>
<Install>true</Install>
</BootstrapperPackage>
</ItemGroup>
<Import Project="$(MSBuildBinPath)Microsoft.VisualBasic.targets" />
<PropertyGroup>
<PreBuildEvent>
</PreBuildEvent>
<PostBuildEvent>
</PostBuildEvent>
</PropertyGroup>
</Project>
TimeCLock
Microsoft Visual Studio Solution File, Format Version 9.00
# Visual Studio 2005
Project("{F184B08F-C81C-45F6-A57F-5ABD9991F28F}") = "TimeClock", "TimeClock.vbproj", "{6989087F-E23E-4CBA-8AED-FFBEB8A2DFAF}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
Release|Any CPU = Release|Any CPU
EndGlobalSection
GlobalSection(ProjectConfigurationPlatforms) = postSolution
{6989087F-E23E-4CBA-8AED-FFBEB8A2DFAF}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{6989087F-E23E-4CBA-8AED-FFBEB8A2DFAF}.Debug|Any CPU.Build.0 = Debug|Any CPU
{6989087F-E23E-4CBA-8AED-FFBEB8A2DFAF}.Release|Any CPU.ActiveCfg = Release|Any CPU
{6989087F-E23E-4CBA-8AED-FFBEB8A2DFAF}.Release|Any CPU.Build.0 = Release|Any CPU
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
EndGlobalSection
EndGlobal
Imports System.IO
Imports System.IO.File
Public Class BillingData
Private mBillingFile As StreamWriter
Private mClientFile As StreamReader
Private mClientColl As New Collection
Sub New()
If Exists("billing.txt") Then
mBillingFile = AppendText("billing.txt")
Else
mBillingFile = CreateText("billing.txt")
End If
mClientFile = OpenText("clients.txt")
While mClientFile.Peek <> -1
mClientColl.Add(mClientFile.ReadLine()) 'company name
End While
mClientFile.Close()
End Sub
Public ReadOnly Property ClientColl() As Collection
Get
Return mClientColl
End Get
End Property
Public Sub WriteBilling(ByVal record As String)
mBillingFile.WriteLine(record)
End Sub
Public Sub CloseBilling()
mBillingFile.Close()
End Sub
End Class
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