Learn Microsoft Access Advanced Programming Techniques, Tips and Tricks.


This is an image of the Main Switchboard Screen, where a Reminder Ticker is active and scrolls with a continuous stream of information.The Automotive Sales & Service Company enters into Vehicle Service Contracts with Corporate Customers for various periods and maintains the data in an MS-Access Database. Every month a few Vehicle Contracts are due for renewal and the Staff concerned have to contact those Customers and check whether they would like to renew their Maintenance Contract with the Company or not.

The Reminder Ticker displays the Customer Code, Vehicle Model, Chassis Number, Vehicle Description and Expiry Date (not yet moved into the visible area of the Ticker).

The Input Data for the Ticker is extracted from the Vehicle Maintenance Contract Table based on the Expiry Date falling within the current month, with the help of a Query. Customer Code, Vehicle Model Number, Chassis Number, Vehicle Description & Expiry Date Values of each contract record is concatenated into a Variant Variable (String Variable may limit the length of the String to 255 characters) and used for the Ticker with the help of Timer.

The VB Code that does this trick is given below:

Option Compare Database 
Option Explicit 
'Global Declaration 
Dim strTxt  
Private Sub Form_Open(Cancel As Integer) 
Dim db As Database, rst As Recordset 
Dim rstcount As Integer, currMonth As Integer, marqMonth  
On Error GoTo Form_Open_Err  
currMonth = Month(Date)  
' Expiry_Marque is a parameter Table which holds  
' the Start-Date & End-Date of Current Month and uses to pick  
'the Contract Expiry Cases falls within this period.  

marqMonth = Month(DLookup("ExpDateTo", "Expiry_Marque"))  
If currMonth   marqMonth Then  
' when the month is changed the parameter table is  
' updated with changed period. 
' i.e. Start-Date and End-Date of the Current Month  
DoCmd.SetWarnings False 
DoCmd.OpenQuery "Expiry_Marque_Updt", acViewNormal 
DoCmd.SetWarnings True 
End If  
'checks whether any contract expiry cases are there 
'during the month.  

rstcount = dCount("*", "Expiry_MarqueQ")  
If Nz(rstcount, 0) = 0 Then
  strTxt = String(60, " ") & "*" NO CONTRACT EXPIRY CASES FOR "
  strTxt = strTxt & Format(Date, "mmmm yyyy") & " **"  
GoTo Form_Open_Exit
End If  
' builds the String strTxt with ticker data.  
Set db = CurrentDb 
Set rst = db.OpenRecordset("Expiry_MarqueQ", dbOpenDynaset)
  strTxt = String(60, " ") & "Expiry Cases:"
  Do While Not rst.EOF  
     With rst
 strTxt = strTxt & " ** {" & rst.AbsolutePosition + 1 & "}. CUST: ["
        strTxt = strTxt & ![CUST_COD] & "] MODEL :[" & ![MODL_COD]
        strTxt = strTxt & "]  CHAS :[" & ![CHASSIS] & "](" & ![DESC]   
        strTxt = strTxt & ") EXP.: " & ![EXP_DATE]
 End With
'A Text Box on the Form is set with the Total Number 
'of Contracts getting expired.
  Me![mVehl] = rstcount & " Vehicles."  
' the Timer is invoked and the time to refresh  
' the control is set with quarter of a 
' second. This value may be modified.
Me.TimerInterval = 250 
Set rst = Nothing 
Set db = Nothing  
Exit Sub  
Form_Open_Err: MsgBox Err.Description, ,"Form_Open" 
Resume Form_Open_Exit 
End Sub   

Private Sub Form_Timer() 
Dim x  
On Error GoTo Form_Timer_Error  
x = Left(strTxt, 1)  
strTxt = Right(strTxt, Len(strTxt) - 1)  
strTxt = strTxt & x  
' Create a Label with the Name lblmarq  
' on your Form to scroll the values 
' The value 200 used in the Left Function may be 
' modified based on the length of the 
' Label. Format the Label with a fixed width font 
' like Courier New so that you can correctly determine 
' how many characters can be displayed on the legth 
' of the Label at one time and change the value accordingly.  

lblmarq.Caption = Left(strTxt, 200)  

Exit Sub  
MsgBox Err.Description, , "Form_Timer_Error" 
Resume Form_Timer_Exit  
End Sub 

The code starts running immediately after opening the form and runs continuously, till you close the form.

When the Form become inactive, after you open some other Form over it, the Ticker is deactivated. If  nobody is watching there is no point in keep running the Program. When the Form become active again the ticker starts running again. To add this capability to the reminder ticker copy and paste the following Code also into the Form Module:

Private Sub Form_Deactivate()
     Me.TimerInterval = 0
End Sub

Private Sub Form_Activate() 
Me.TimerInterval = 250 
End Sub

You can download a demo sample database from the download link given below:

Download Demo Database


No comments:

Post a Comment


Your email address:

Delivered by FeedBurner


Popular Posts

Search This Blog

Blog Archive

Powered by Blogger.


Forms How Tos Functions MS-Access Security Reports msaccess forms Animations msaccess animation Utilities msaccess controls Access and Internet MS-Access Scurity MS-Access and Internet Queries External Links msaccess reports msaccess tips Accesstips Menus and Toolbars Array MsaccessLinks Process Controls Art Work Downloads msaccess How Tos Graph Charts msaccessQuery Class Module List Boxes Property Combo Boxes Command Buttons Emails and Alerts Query VBA Calculation Custom Wizards DOS Commands Data Data Type Objects ms-access functions msaccess functions msaccess graphs msaccess reporttricks msaccessprocess security advanced Access Security Collection Object Custom Functions Field Type Form Macros Menus Object Reference Report Top Values Variables msaccess email msaccess menus progressmeter Access2007 Auto-Number Command Button Controls Copy Expression Fields Form Instances Join Methods Microsoft Numbering System Records Recordset Security Split SubForm Table Utility Workgroup database msaccess wizards Access2003 Accounting Year Action Animation Attachment Binary Numbers Bookmarks Budgeting ChDir Color Palette Conditional Formatting Data Filtering Defining Pages Diagram Disk Dynamic Lookup Error Handler Excel Export External Filter Formatting Groups Hexadecimal Numbers Import Labels List Logo Macro Mail Merge Main Form Memo Monitoring Octal Numbers Operating System Paste Primary-Key Product Rank Reading Rich Text Sequence SetFocus Summary Tab-Page Tables Time Difference Union Query User Users Water-Mark Word Wrapper Classes automatically commands function hyperlinks iSeries Date iif ms-access msaccess msaccess alerts pdf files reference restore switch text toolbar tutorial updating upload vba code

Featured Post

Table Records in Collection Object and Form

Data records from a Table will be Add ed as the Collection Object Items and Description field values goes into the Collection Object as Ke...


Blog Archive

Recent Posts