Integrating Microsoft Access with AutoCAD VBA dave espinosa-aguilar Toxic Frog Multimedia

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1 November 30 December 3, 2004 Las Vegas, Nevada Integrating Microsoft Access with AutoCAD VBA dave espinosa-aguilar Toxic Frog Multimedia CP32-3 Course Description: For years AutoCAD users have been trying to learn how to integrate the power of Microsoft Access databases with AutoCAD drawings. This course introduces intermediate and advanced AutoCAD users to the programming concepts required to link and maintain the integration of these two products through AutoCAD s Visual Basic for Applications. Examples of code to generate facilities management applications will be discussed in depth. About the Speaker: As a consultant in CAD and multimedia since 1986, dave trains professionals in architectural and engineering firms on the general use, customization, and advanced programming of Autodesk design and visualization software. He has authored facilities management applications for several Fortune 500 companies using ObjectARX, VBA, and AutoLISP technologies. dave also creates graphics applications and animations for Toxic Frog Multimedia and has co-authored several books including NRP's Inside 3D Studio MAX series. dave served on the Board of Directors for AUGI for 6 years, including serving as president in 1996.

2 Integrating Microsoft Access with AutoCAD VBA Integrating Microsoft Access with AutoCAD VBA AutoCAD VBA/Access Sample Application: Tree Manager Imagine that we have a property with many different kinds of trees on it and we want to be able to manage it. Our application will need to be able to create, open and delete the tree database, add new records for new trees, delete records for dead and removed trees, edit records as trees get older or as their individual requirements change. We want to be able to find certain types of trees on the property easily, and we also want to know the costs of any tree type (or the cost of all trees) on the property. Each tree has a tree type (pine, maple, etc.), a tree age, an amount of water (gallons) it requires to stay alive, and a cost associated with it. Therefore, each tree will have a unique record in our database, and every record for a tree will have the same 5 fields: Field Name entityhandle type age water cost Field Type text text number/double number/double currency The trees.mdb file (with table mytree in it) will correspond with the trees.dwg file so that records and AutoCAD entities remain synchronized. The entityhandle field holds the hexadecimal value of a linked tree entity (we will draw any tree in AutoCAD as a circle). If a tree gets removed from the property, then the corresponding record for that tree also gets removed. If a new tree gets added to the property, then a new record gets generated for it. The application will also let us highlight trees by any record value, and we can also calculate the cost of any trees on the property by any record value. The proposed dialog for the application is above to the right. it consists of CommandButtons, EditBoxes and Labels. There is an invisible Label (Label2) to the immediate right of the AutoCAD Handle Label which has it s.caption property updated as handles for entities get reported. The code for the entire application is provided below, and this class will be dedicated to a thorough discussion of it. The SQL Statement box is used by the Highlight trees function and the Cost trees function. If you re not familiar with SQL, it s high-time you should be. These two functions rely completely on it. For a quick primer, if we wanted to highlight or cost all trees that are of Type pine, the SQL statement to do this would be: select * from tree where type= pine 2

3 Integration of Microsoft Access with AutoCAD VBA don t forget to establish reference for DAO object (release dependent) Public wksobj As Object Public dbsobj As Object Public tblobj As Object Public fldobj As Object Public rstobj As Object Public hstr As Variant Sub CommandButton1_Click() 'create new tree database On Error Resume Next Kill "trees.mdb" Set wksobj = DBEngine.Workspaces(0) Set dbsobj = wksobj.createdatabase("trees.mdb", dblanggeneral) Set tblobj = dbsobj.createtabledef("tree") With tblobj.fields.append.createfield("entityhandle", dbtext).fields.append.createfield("type", dbtext).fields.append.createfield("age", dblong).fields.append.createfield("water", dblong).fields.append.createfield("cost", dbcurrency) End With dbsobj.tabledefs.append tblobj dbsobj.tabledefs.refresh Set rstobj = dbsobj.openrecordset("tree", dbopentable) Sub CommandButton2_Click() 'open existing tree database On Error Resume Next Set dbsobj = DBEngine.Workspaces(0).OpenDatabase("trees.mdb") Set rstobj = dbsobj.openrecordset("tree", dbopentable) rstobj.movefirst 3

4 Integrating Microsoft Access with AutoCAD VBA Sub CommandButton3_Click() 'close database and quit rstobj.close End Sub CommandButton4_Click() 'move to first record rstobj.movefirst Sub CommandButton5_Click() 'move to previous record rstobj.moveprevious If rstobj.bof = True Then rstobj.movenext Sub CommandButton6_Click() 'move to next record rstobj.movenext If rstobj.eof = True Then rstobj.moveprevious 4

5 Integration of Microsoft Access with AutoCAD VBA Sub CommandButton7_Click() 'move to last record Sub CommandButton8_Click() 'add tree to property If TextBox1.Text <> "" And TextBox2.Text <> "" And TextBox3.Text <> "" And TextBox4.Text <> "" Then 'draw tree Dim treeobj As AcadEntity Dim treepnt(0 To 2) As Double Dim treerad As Double Dim PntA As Variant UserForm1.Hide PntA = ThisDrawing.Utility.GetPoint(, "Pick tree point: ") treepnt(0) = PntA(0): treepnt(1) = PntA(1): treepnt(2) = PntA(2) treerad = 1# Set treeobj = ThisDrawing.ModelSpace.AddCircle(treePnt, treerad) 'add record hand$ = treeobj.handle rstobj.addnew rstobj!entityhandle = hand$ rstobj!type = TextBox1.Text rstobj!age = TextBox2.Text rstobj!water = TextBox3.Text rstobj!cost = TextBox4.Text rstobj.update 5

6 Integrating Microsoft Access with AutoCAD VBA UserForm1.Show Else MsgBox ("You must complete all tree fields.") End If Sub CommandButton9_Click() 'remove tree from property Dim sset As Object Dim treeobj As Object Set sset = ThisDrawing.SelectionSets.Add("handler") UserForm1.Hide sset.selectonscreen Set treeobj = sset.item(0) hand$ = treeobj.handle sset.delete Set rstobj = dbsobj.openrecordset("tree", dbopendynaset) 'find record ustr$ = "entityhandle = " & Chr(34) & hand$ & Chr(34) rstobj.findfirst ustr$ 'delete record and tree rstobj.delete treeobj.delete Label2.Caption = "" TextBox1.Text = "" TextBox2.Text = "" TextBox3.Text = "" TextBox4.Text = "" UserForm1.Show Sub CommandButton10_Click() 6

7 Integration of Microsoft Access with AutoCAD VBA 'edit tree record rstobj.edit rstobj!type = TextBox1.Text rstobj!age = TextBox2.Text rstobj!water = TextBox3.Text rstobj!cost = TextBox4.Text rstobj.update Sub CommandButton11_Click() 'highlight trees by SQL If TextBox5.Text <> "" Then Dim i As Integer sqlstr$ = TextBox5.Text Set rstobj = dbsobj.openrecordset(sqlstr$) rstobj.movefirst UserForm1.Hide 'clear previous highlights For i = 0 To ThisDrawing.ModelSpace.Count - 1 ThisDrawing.ModelSpace.Item(i).Highlight (False) Next i 'set new highlights Do While Not rstobj.eof For i = 0 To ThisDrawing.ModelSpace.Count - 1 hstr2$ = ThisDrawing.ModelSpace.Item(i).Handle If hstr2$ = hstr Then ThisDrawing.ModelSpace.Item(i).Highlight (True) Next i rstobj.movenext Loop 'restore complete recordset 7

8 Integrating Microsoft Access with AutoCAD VBA Set rstobj = dbsobj.openrecordset("tree", dbopentable) rstobj.movefirst MsgBox ("Pick when finishing viewing.") UserForm1.Show Else MsgBox ("No SQL statement provided.") End If Sub CommandButton12_Click() 'de-highlight everything and clear previous highlights UserForm1.Hide For i = 0 To ThisDrawing.ModelSpace.Count - 1 ThisDrawing.ModelSpace.Item(i).Highlight (False) Next i MsgBox ("Pick when finished viewing.") UserForm1.Show Sub CommandButton13_Click() 'cost by SQL Dim i As Integer Dim total As Currency If TextBox5.Text <> "" Then TextBox6.Text = "": sqlstr$ = TextBox5.Text Set rstobj = dbsobj.openrecordset(sqlstr$) rstobj.movefirst total = 0# 'set new highlights Do While Not rstobj.eof total = total + rstobj!cost rstobj.movenext 8

9 Integration of Microsoft Access with AutoCAD VBA Loop 'restore complete recordset Set rstobj = dbsobj.openrecordset("tree", dbopentable) : rstobj.movefirst 'report total TextBox6.Text = total Else MsgBox ("No SQL statement provided.") End If Sub CommandButton14_Click() 'set current tree record Dim sset As Object Dim treeobj As Object Set sset = ThisDrawing.SelectionSets.Add("handler") UserForm1.Hide sset.selectonscreen Set treeobj = sset.item(0) hand$ = treeobj.handle Set rstobj = dbsobj.openrecordset("tree", dbopendynaset) sset.delete 'find record ustr$ = "entityhandle = " & Chr(34) & hand$ & Chr(34) rstobj.findfirst ustr$ 9

10 Integrating Microsoft Access with AutoCAD VBA UserForm1.Show Additional sample applications will be shown during the class. 10