VERSION 5.00
Begin VB.Form Form1
Caption = "Staff Scheduling Example Using the LINDO API"
ClientHeight = 4725
ClientLeft = 60
ClientTop = 345
ClientWidth = 5685
LinkTopic = "Form1"
ScaleHeight = 4725
ScaleWidth = 5685
StartUpPosition = 3 'Windows Default
Begin VB.CommandButton Exit
Caption = "Exit"
Height = 375
Left = 4440
TabIndex = 10
Top = 840
Width = 1095
End
Begin VB.CommandButton Solve
Caption = "Solve"
Height = 375
Left = 4440
TabIndex = 9
Top = 360
Width = 1095
End
Begin VB.TextBox Needs
Alignment = 2 'Center
Height = 375
Index = 0
Left = 960
TabIndex = 1
Text = "0"
Top = 720
Width = 975
End
Begin VB.TextBox Needs
Alignment = 2 'Center
Height = 375
Index = 6
Left = 960
TabIndex = 8
Text = "0"
Top = 3600
Width = 975
End
Begin VB.TextBox Needs
Alignment = 2 'Center
Height = 375
Index = 5
Left = 960
TabIndex = 7
Text = "0"
Top = 3120
Width = 975
End
Begin VB.TextBox Needs
Alignment = 2 'Center
Height = 375
Index = 4
Left = 960
TabIndex = 5
Text = "0"
Top = 2640
Width = 975
End
Begin VB.TextBox Needs
Alignment = 2 'Center
Height = 375
Index = 3
Left = 960
TabIndex = 4
Text = "0"
Top = 2160
Width = 975
End
Begin VB.TextBox Needs
Alignment = 2 'Center
Height = 375
Index = 2
Left = 960
TabIndex = 3
Text = "0"
Top = 1680
Width = 975
End
Begin VB.TextBox Needs
Alignment = 2 'Center
Height = 375
Index = 1
Left = 960
TabIndex = 2
Text = "0"
Top = 1200
Width = 975
End
Begin VB.Label Total
Alignment = 2 'Center
Caption = "0"
Height = 255
Left = 2160
TabIndex = 35
Top = 4320
Width = 855
End
Begin VB.Label Start
Alignment = 2 'Center
Caption = "0"
Height = 255
Index = 6
Left = 2160
TabIndex = 34
Top = 3600
Width = 855
End
Begin VB.Label Start
Alignment = 2 'Center
Caption = "0"
Height = 255
Index = 5
Left = 2160
TabIndex = 33
Top = 3120
Width = 855
End
Begin VB.Label Start
Alignment = 2 'Center
Caption = "0"
Height = 255
Index = 4
Left = 2160
TabIndex = 32
Top = 2640
Width = 855
End
Begin VB.Label Start
Alignment = 2 'Center
Caption = "0"
Height = 255
Index = 3
Left = 2160
TabIndex = 31
Top = 2160
Width = 855
End
Begin VB.Label Start
Alignment = 2 'Center
Caption = "0"
Height = 255
Index = 2
Left = 2160
TabIndex = 30
Top = 1680
Width = 855
End
Begin VB.Label Start
Alignment = 2 'Center
Caption = "0"
Height = 255
Index = 1
Left = 2160
TabIndex = 29
Top = 1200
Width = 855
End
Begin VB.Label Start
Alignment = 2 'Center
Caption = "0"
Height = 255
Index = 0
Left = 2160
TabIndex = 28
Top = 720
Width = 855
End
Begin VB.Label OnDuty
Alignment = 2 'Center
Caption = "0"
Height = 255
Index = 6
Left = 3240
TabIndex = 27
Top = 3600
Width = 975
End
Begin VB.Label OnDuty
Alignment = 2 'Center
Caption = "0"
Height = 255
Index = 5
Left = 3240
TabIndex = 26
Top = 3120
Width = 975
End
Begin VB.Label OnDuty
Alignment = 2 'Center
Caption = "0"
Height = 255
Index = 4
Left = 3240
TabIndex = 25
Top = 2640
Width = 975
End
Begin VB.Label OnDuty
Alignment = 2 'Center
Caption = "0"
Height = 255
Index = 3
Left = 3240
TabIndex = 24
Top = 2160
Width = 975
End
Begin VB.Label OnDuty
Alignment = 2 'Center
Caption = "0"
Height = 255
Index = 2
Left = 3240
TabIndex = 23
Top = 1680
Width = 975
End
Begin VB.Label OnDuty
Alignment = 2 'Center
Caption = "0"
Height = 255
Index = 1
Left = 3240
TabIndex = 22
Top = 1200
Width = 975
End
Begin VB.Label OnDuty
Alignment = 2 'Center
Caption = "0"
Height = 255
Index = 0
Left = 3240
TabIndex = 21
Top = 720
Width = 975
End
Begin VB.Label Label1
Caption = "Mon"
Height = 255
Index = 11
Left = 240
TabIndex = 20
Top = 720
Width = 615
End
Begin VB.Label Label1
Caption = "Tue"
Height = 255
Index = 10
Left = 240
TabIndex = 19
Top = 1200
Width = 615
End
Begin VB.Label Label1
Caption = "Wed"
Height = 255
Index = 9
Left = 240
TabIndex = 18
Top = 1680
Width = 615
End
Begin VB.Label Label1
Caption = "Thu"
Height = 255
Index = 8
Left = 240
TabIndex = 17
Top = 2160
Width = 615
End
Begin VB.Label Label1
Caption = "Fri"
Height = 255
Index = 7
Left = 240
TabIndex = 16
Top = 2640
Width = 615
End
Begin VB.Label Label1
Caption = "Sat"
Height = 255
Index = 6
Left = 240
TabIndex = 15
Top = 3120
Width = 615
End
Begin VB.Label Label1
Caption = "Sun"
Height = 255
Index = 5
Left = 240
TabIndex = 14
Top = 3600
Width = 615
End
Begin VB.Label Label1
Alignment = 2 'Center
Caption = "Needs"
Height = 255
Index = 4
Left = 960
TabIndex = 13
Top = 360
Width = 975
End
Begin VB.Label Label1
Alignment = 2 'Center
Caption = "Start"
Height = 255
Index = 3
Left = 2160
TabIndex = 12
Top = 360
Width = 855
End
Begin VB.Label Label1
Alignment = 2 'Center
Caption = "On Duty"
Height = 255
Index = 2
Left = 3240
TabIndex = 11
Top = 360
Width = 975
End
Begin VB.Label Label1
Caption = "Total:"
Height = 255
Index = 1
Left = 1320
TabIndex = 6
Top = 4275
Width = 495
End
Begin VB.Label Label1
Caption = "Day"
Height = 255
Index = 0
Left = 240
TabIndex = 0
Top = 360
Width = 495
End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit
Private Sub Exit_Click()
End
End Sub
Private Sub Solve_Click()
Dim nErr As Long
'>>> Step 1 <<< create the environment
Dim pEnv As Long
pEnv = LScreateEnv(nErr, MY_LICENSE_KEY)
If (pEnv = 0) Then
MsgBox ("Unable to create environment")
End
End If
'>>> Step 2 <<< create a model in the environment
Dim pMod As Long
pMod = LScreateModel(pEnv, nErr)
Call CheckErr(pEnv, nErr)
'>>> Step 3 <<< construct the model
'number of variables
Dim nVars As Long
nVars = 7
'number of constraints
Dim nRows As Long
nRows = 7
'direction of objective
Dim nDir As Long
nDir = LS_MIN
'objective constant term
Dim dObjConst As Double
dObjConst = 0
'objective coefficients
ReDim dObjCoef(nVars) As Double
Dim i As Integer
For i = 0 To nVars - 1
dObjCoef(i) = 1
Next
'get the staffing needs for the model's right-hand sides
ReDim dB(nVars) As Double
For i = 0 To nVars - 1
dB(i) = Needs(i)
Next
'define the constraint types
Dim cConTypes As String
For i = 0 To nRows - 1
cConTypes = cConTypes & "G"
Next
'the number of nonzero coefficients
Dim nNZ As Long
nNZ = 35
'the array of column start indices
ReDim nBegCol(nVars + 1) As Long
For i = 0 To nVars
nBegCol(i) = 5 * i
Next
'the nonzero coefficients
ReDim dA(nNZ) As Double
ReDim nRowX(nNZ) As Long
Dim j, k As Integer
k = 0
For i = 0 To nVars - 1
For j = 0 To 4
nRowX(k) = (j + i) Mod 7
dA(k) = 1
k = k + 1
Next j
Next i
'load the problem
nErr = LSloadLPData(pMod, nRows, nVars, nDir, _
dObjConst, dObjCoef(0), dB(0), cConTypes, nNZ, _
nBegCol(0), ByVal 0, dA(0), nRowX(0), ByVal 0, _
ByVal 0)
Call CheckErr(pEnv, nErr)
'integer restrictions on the variables
Dim cVarType As String
For i = 1 To nVars
cVarType = cVarType & "I"
Next
nErr = LSloadMIPData(pMod, cVarType)
Call CheckErr(pEnv, nErr)
'>>> Step 4 <<< solve the model
nErr = LSbnbSolve(pMod, ByVal 0)
Call CheckErr(pEnv, nErr)
'>>> Step 5 <<< retrieve the solution
ReDim dX(nVars) As Double
Dim dObj As Double
Dim dSlacks(7) As Double
nErr = LSgetMIPSolution(pMod, dObj, dX(0))
Call CheckErr(pEnv, nErr)
nErr = LSgetMIPSlacks(pMod, dSlacks(0))
Call CheckErr(pEnv, nErr)
'post solution in dialog box
Total = dObj
For i = 0 To nVars - 1
OnDuty(i) = dB(i) - dSlacks(i)
Start(i) = dX(i)
Next
'>>> Step 6 <<< Delete the LINDO environment
Call LSdeleteEnv(pEnv)
End Sub
Public Sub CheckErr(pEnv As Long, nErr As Long)
' Checks for an error condition. If one exists, the
' error message is displayed then the application
' terminates.
If (nErr > 0) Then
Dim cMessage As String
cMessage = String(LS_MAX_ERROR_MESSAGE_LENGTH, _
vbNullChar)
Call LSgetErrorMessage(pEnv, nErr, cMessage)
MsgBox (cMessage)
End
End If
End Sub
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