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3 Programming with Excel Builder Components
3-6
Creating an Instance of a Class
Before calling a class method (compiled MATLAB function), you must create an
instance of the class that contains the method. VBA provides two techniques
for doing this:
•
CreateObject function
• Visual Basic
New operator
CreateObject Function
This method uses the Visual Basic application program interface (API)
CreateObject function to create an instance of the class. To use this method,
dimension a variable of type
Object to hold a reference to the class instance
and call
CreateObject with the class’ programmatic identifier (ProgID) as an
argument as shown in the next example.
Function foo(x1 As Variant, x2 As Variant) As Variant
Dim aClass As Object
On Error Goto Handle_Error
aClass = CreateObject("mycomponent.myclass.1_0")
' (call some methods on aClass)
Exit Function
Handle_Error:
foo = Err.Description
End Function
Visual Basic New Operator
This method uses the Visual Basic New operator on a variable explicitly
dimensioned as the class to be created. Before using this method, you must
reference the type library containing the class in the current VBA project. Do
this by selecting the
Tools menu from the Visual Basic editor, and then
selecting
References… to display the Available References list. From this list
select the necessary type library.
The following example illustrates using the
New operator to create a class
instance. It assumes that you have selected
mycomponent 1.0 Type Library
from the
Available References list before calling this function.
Function foo(x1 As Variant, x2 As Variant) As Variant
- MATLAB Excel Builder 1
- How to Contact The MathWorks: 2
- Contents 3
- Usage Examples 5
- Function Wizard 5
- Registration and Versioning 7
- Preface 10
- Suggested Background 11
- Limitations and Restrictions 13
- Typographical Conventions 15
- Overview 17
- 1 Overview 18
- Versions 19
- Add File button or 23
- Build Status 24
- Application Deployment 25
- Graphical User Interface 27
- 2 Graphical User Interface 28
- File Menu 29
- Project Menu 29
- Help Menu 31
- Component Information 33
- Programming with Excel 35
- Builder Components 35
- at the beginning to 39
- CreateObject Function 40
- Visual Basic New Operator 40
- ErrObject object 47
- Modifying Flags 48
- Data Conversion Flags 50
- 4 Usage Examples 54
- Creating the Project 55
- Summary of Project Settings 56
- Building the Project 57
- <matlab>\work, and the 61
- F2 and then Enter 65
- F2 followed by Enter 67
- Spectral Analysis Example 71
- Component name: Fourier 71
- Class name: Fourier 71
- Use Handle Graphics library 71
- ThisWorkbook object 81
- Testing The Add-in 83
- Creating the Data 84
- Running the Test 84
- Function Viewer 89
- Using the Function Viewer 90
- Component Browser 91
- Editing Required Inputs 92
- Properties button 93
- Editing varargin Inputs 94
- Editing Required Outputs 95
- Editing varargout Outputs 96
- Input Argument Range 97
- Input Argument Value 98
- Output Argument Properties 98
- Rename Function 99
- Copy Function 100
- Introduction 101
- 5 Function Wizard 102
- Function Reference 103
- Examples Example 1 104
- Purpose Query system registry 104
- Arguments 104
- Description 104
- 6mxltool 106
- Syntax mxltool 106
- Producing a COM Object 107
- Capabilities 108
- Step 1. Code Generation 111
- Step 3. C++ Compilation 111
- COM Class.method 113
- Producing a COM Class 114
- IDL Mapping 114
- Visual Basic Mapping 115
- MATLAB Compiler Output 116
- Calling Conventions 117
- Data Conversion 119
- B Data Conversion 120
- Data Conversion Rules 121
- CoerceNumericToType 132
- InputDateFormat 132
- OutputAsDate As Boolean 132
- DateBias As Long 133
- Registration and 135
- Versioning 135
- C Registration and Versioning 136
- Component Registration 137
- Utility Library 145
- D Utility Library 146
- Utility Library Classes 147
- Sub MWDate2VariantDate(pVar) 152
- Class MWFlags 153
- Sub Clone(ppFlags As MWFlags) 159
- Property NumberOfDims As Long 164
- Property Dims As Variant 164
- Property Name As String 166
- Property Value As Variant 167
- Property MWFlags As MWFlags 167
- Sub Clone(ppField As MWField) 167
- Property Real As Variant 168
- Property Imag As Variant 168
- Sub Clone(ppArg As MWArg) 173
- Enum mwDateFormat 175
- Troubleshooting 177
- E Troubleshooting 178
- Medium on the 179
- Security Level tab 179
- VARIANT B-2 181
- CreateObject function 3-6 181
- Enumeration 181
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