Comparing Structurers in ATEasy (Q200172)
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Summary:
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This article demonstrates a simple procedure for comparing struct fields. |
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Programming languages typically do not support structure comparison directly. In ATEasy, structures can be compared by converting them to a Variant and then comparing the variants. In ATEasy, when a structure is assigned to a variant, the structure is converted to an array of variant data types, where each field of the structure becomes an element in the array.
A generic structure comparison procedure can be coded as follows:
Procedure CompareStructs(vrStruct1, vrStruct2): Bool
! Compare structs of the same type, return TRUE if equal, FALSE otherwise
--------------------------------------------------------------------------------
vrStruct1: Val Variant
vrStruct2: Val Variant
i: Long
{
! Must have the same number of fields
If VarDimSize(vrStruct1, 0)<> VarDimSize(vrStruct2, 0) Then Return FALSE
! Compare each element/field
For i=0 To VarDimSize(vrStruct1, 0)-1
! Test if element is another array/structure
If VarDimSize(vrStruct1[i], 0)
! Re-call CompareStructs() procedure
Return CompareStructs(vrStruct1[i],vrStruct2[i])
Else
! Test for same data type
If VarType(vrStruct1[i])<>VarType(vrStruct2[i]) Then Return FALSE
! Test for same value
If vrStruct1[i]<>vrStruct2[i] Then Return FALSE
EndIf
Next
! structs are equal
Return TRUE
} |
Following are example tests to compare two structs of the same type with both Pass and Fail results, and two nested structures with both Pass and Fail results:
Types
================================================================================
strTest: Struct
{
Field1: Long
Field2: Long
Field3: String
}
strTest2: Struct
{
Field1: String
Field2: strTest
}
================================================================================
Variables
================================================================================
st1: strTest
st2: strTest
nst1: strTest2
nst2: strTest2
================================================================================
Tests
================================================================================
Task 1 : "Test Compare Structs"
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Test 1.1 : "Struct Compare"
--------------------------------------------------------------------------------
Type = Precise
Value = -1
{
st1.Field1=1
st1.Field2=2
st1.Field3="123"
st2.Field1=1
st2.Field2=2
st2.Field3="123"
TestResult=CompareStructs(st1,st2)
}
Test 1.2 : "Struct Not Compare"
--------------------------------------------------------------------------------
Type = Precise
Value = -1
{
st1.Field1=1
st1.Field2=2
st1.Field3="123"
st2.Field1=1
st2.Field2=2
st2.Field3="132"
TestResult=CompareStructs(st1,st2)
}
Task 2 : "Test Compare Nested Structs"
--------------------------------------------------------------------------------
Test 2.1 : "Struct Compare"
--------------------------------------------------------------------------------
Type = Precise
Value = -1
{
nst1.Field1="Test"
nst1.Field2.Field1=1
nst1.Field2.Field2=2
nst1.Field2.Field3="123"
nst2.Field1="Test"
nst2.Field2.Field1=1
nst2.Field2.Field2=2
nst2.Field2.Field3="123"
TestResult=CompareStructs(nst1,nst2)
}
Test 2.2 : "Struct Not Compare"
--------------------------------------------------------------------------------
Type = Precise
Value = -1
{
nst1.Field1="Test"
nst1.Field2.Field1=1
nst1.Field2.Field2=2
nst1.Field2.Field3="123"
nst2.Field1="Test"
nst2.Field2.Field1=1
nst2.Field2.Field2=2
nst2.Field2.Field3="132"
TestResult=CompareStructs(nst1,nst2)
} |
Running the Task/Test programs produces the following results:
Test Log Results:
Task 1 : Test Compare Structs
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# Test Name Pin Unit Value Result Status
--- ------------------ ------ ------ ---------- ---------- ------
001 Struct Compare - - -1.0000 -1.0000 Pass
002 Struct Not Compare - - -1.0000 +0.0000 Fail*
Task 2 : Test Compare Structs
------------------------------------------
# Test Name Pin Unit Value Result Status
--- ------------------ ------ ------ ---------- ---------- ------
001 Struct Compare - - -1.0000 -1.0000 Pass
002 Struct Not Compare - - -1.0000 +0.0000 Fail* |
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Article Date: |
2/1/2010 12:43:15 PM |
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Keywords:
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Struct, Compare Structures, ATEasy |
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