VBA array functions: push, pop, shift, unshift
2
$begingroup$
I want to write my snake game procedurally, using as much windows call as I can so as to practice. Looking into GetAsyncKeyState to capture keyboard inputs and play sound functions. Also making a sweet user interface. Fun!
Also shout to bytecomb for providing example as to how to traverse the array structure, used his code function to find ptr to element in array!!
API CALLS
Option Explicit
Private Declare PtrSafe Function VarPtrArray Lib "VBE7" Alias "VarPtr" _
(ByRef Var() As Any) As LongPtr
Private Declare PtrSafe Sub CopyMemoryI Lib "kernel32.dll" Alias "RtlMoveMemory" _
(ByVal dst As LongPtr, ByVal src As LongPtr, ByVal Length As Long)
Private Declare PtrSafe Sub CopyMemoryII Lib "kernel32.dll" Alias "RtlMoveMemory" _
(ByRef dst As SAFEARRAY, ByVal src As LongPtr, ByVal Length As Long)
Private Declare PtrSafe Function GetAsyncKeyState Lib "user32" _
(ByVal vKey As Long) As Boolean
DATA STRUCTS
Private Type SAFEARRAY_BOUND
cElements As Long
lLbound As Long
End Type
Private Type SAFEARRAY
cDims As Integer
fFeatures As Integer
cbElements As Long
cLocks As Long
pvData As LongPtr
rgsabound(0) As SAFEARRAY_BOUND
End Type
Private Type SnakePart
Column As Long
Row As Long
End Type
Private Const SNAKEPART_BYTELENGTH = 8
FUNCTIONS
Private Function ArrayPush(ByRef ArrayOriginal() As SnakePart, ByRef ElementToAdd As SnakePart) As SnakePart()
Dim NewLength As Long
Dim CopiedBytes As Long
Dim NewBytes As Long
NewLength = UBound(ArrayOriginal) + 1
ReDim ArrayPush(NewLength)
CopiedBytes = NewLength * SNAKEPART_BYTELENGTH
NewBytes = SNAKEPART_BYTELENGTH
CopyMemoryI ArrayElementGetPointer(ArrayPush, 0, SNAKEPART_BYTELENGTH), ArrayElementGetPointer(ArrayOriginal, 0, SNAKEPART_BYTELENGTH), CopiedBytes
CopyMemoryI ArrayElementGetPointer(ArrayPush, NewLength, SNAKEPART_BYTELENGTH), VarPtr(ElementToAdd), NewBytes
End Function
Private Function ArrayPop(ByRef ArrayOriginal() As SnakePart) As SnakePart()
Dim NewLength As Long
Dim CopiedBytes As Long
NewLength = UBound(ArrayOriginal) - 1
ReDim ArrayPop(NewLength)
CopiedBytes = UBound(ArrayOriginal) * SNAKEPART_BYTELENGTH
CopyMemoryI ArrayElementGetPointer(ArrayPop, 0, SNAKEPART_BYTELENGTH), ArrayElementGetPointer(ArrayOriginal(), 0, SNAKEPART_BYTELENGTH), CopiedBytes
End Function
Private Function ArrayShift(ByRef ArrayOriginal() As SnakePart, ByRef ElementToAdd As SnakePart) As SnakePart()
Dim NewLength As Long
Dim CopiedBytes As Long
Dim NewBytes As Long
NewLength = UBound(ArrayOriginal) + 1
ReDim ArrayShift(NewLength)
CopiedBytes = NewLength * SNAKEPART_BYTELENGTH
NewBytes = SNAKEPART_BYTELENGTH
CopyMemoryI ArrayElementGetPointer(ArrayShift, 1, SNAKEPART_BYTELENGTH), ArrayElementGetPointer(ArrayOriginal, 0, SNAKEPART_BYTELENGTH), CopiedBytes
CopyMemoryI ArrayElementGetPointer(ArrayShift, 0, SNAKEPART_BYTELENGTH), VarPtr(ElementToAdd), NewBytes
End Function
Private Function ArrayUnshift(ByRef ArrayOriginal() As SnakePart) As SnakePart()
Dim NewLength As Long
Dim CopiedBytes As Long
NewLength = UBound(ArrayOriginal) - 1
ReDim ArrayUnshift(NewLength)
CopiedBytes = UBound(ArrayOriginal) * SNAKEPART_BYTELENGTH
CopyMemoryI ArrayElementGetPointer(ArrayUnshift, 0, SNAKEPART_BYTELENGTH), ArrayElementGetPointer(ArrayOriginal, 1, SNAKEPART_BYTELENGTH), CopiedBytes
End Function
Private Function ArrayElementGetPointer(ByRef Arr() As SnakePart, ByVal ElementIndex As Long, ByVal ElementByteLength As Long) As LongPtr
Dim ptrToArrayVar As LongPtr
Dim ptrToSafeArray As LongPtr
Dim ptrToArrayData As LongPtr
Dim ptrCursor As LongPtr
Dim uSAFEARRAY As SAFEARRAY
' Get Pointer To Array *Variable*
ptrToArrayVar = VarPtrArray(Arr)
' Get Pointer To Array Variable *SAFEARRAY* By Directly Reading Array Variable
CopyMemoryI VarPtr(ptrToSafeArray), ptrToArrayVar, 8
' Read The SAFEARRAY Structure
CopyMemoryII uSAFEARRAY, ptrToSafeArray, LenB(uSAFEARRAY)
' Get Pointer To Array Data
ptrToArrayData = uSAFEARRAY.pvData
' Get Pointer To Array Element
ptrCursor = ptrToArrayData + (ElementIndex * ElementByteLength)
ArrayElementGetPointer = ptrCursor
End Function
TESTS
Private Sub test()
Dim x(3) As SnakePart
Dim sp As SnakePart
sp.Column = 1
sp.Row = 1
x(0) = sp
x(1) = sp
x(2) = sp
x(3) = sp
' expect all 1s
Debug.Print x(0).Column
Debug.Print x(1).Column
Debug.Print x(2).Column
Debug.Print x(3).Column
Debug.Print "_______________________"
sp.Column = 2
Dim temparry() As SnakePart
temparry = x
temparry = ArrayPush(temparry, sp)
Debug.Print "expect 2 at end"
Debug.Print temparry(0).Column
Debug.Print temparry(1).Column
Debug.Print temparry(2).Column
Debug.Print temparry(3).Column
Debug.Print temparry(4).Column
Debug.Print "_______________________"
temparry = ArrayPop(temparry)
Debug.Print "expect all 1"
Debug.Print temparry(0).Column
Debug.Print temparry(1).Column
Debug.Print temparry(2).Column
Debug.Print temparry(3).Column
Debug.Print "_______________________"
temparry = ArrayShift(temparry, sp)
Debug.Print "expect 2 at start"
Debug.Print temparry(0).Column
Debug.Print temparry(1).Column
Debug.Print temparry(2).Column
Debug.Print temparry(3).Column
Debug.Print temparry(4).Column
Debug.Print "_______________________"
temparry = ArrayUnshift(temparry)
Debug.Print "expect all 1"
Debug.Print temparry(0).Column
Debug.Print temparry(1).Column
Debug.Print temparry(2).Column
Debug.Print temparry(3).Column
End Sub
array vba excel vectors winapi
edited 25 mins ago
200_success
130k17156420
asked Mar 18 at 5:06
learnAsWeGolearnAsWeGo
2987
$endgroup$
add a comment |
2
$begingroup$
I want to write my snake game procedurally, using as much windows call as I can so as to practice. Looking into GetAsyncKeyState to capture keyboard inputs and play sound functions. Also making a sweet user interface. Fun!
Also shout to bytecomb for providing example as to how to traverse the array structure, used his code function to find ptr to element in array!!
API CALLS
Option Explicit
Private Declare PtrSafe Function VarPtrArray Lib "VBE7" Alias "VarPtr" _
(ByRef Var() As Any) As LongPtr
Private Declare PtrSafe Sub CopyMemoryI Lib "kernel32.dll" Alias "RtlMoveMemory" _
(ByVal dst As LongPtr, ByVal src As LongPtr, ByVal Length As Long)
Private Declare PtrSafe Sub CopyMemoryII Lib "kernel32.dll" Alias "RtlMoveMemory" _
(ByRef dst As SAFEARRAY, ByVal src As LongPtr, ByVal Length As Long)
Private Declare PtrSafe Function GetAsyncKeyState Lib "user32" _
(ByVal vKey As Long) As Boolean
DATA STRUCTS
Private Type SAFEARRAY_BOUND
cElements As Long
lLbound As Long
End Type
Private Type SAFEARRAY
cDims As Integer
fFeatures As Integer
cbElements As Long
cLocks As Long
pvData As LongPtr
rgsabound(0) As SAFEARRAY_BOUND
End Type
Private Type SnakePart
Column As Long
Row As Long
End Type
Private Const SNAKEPART_BYTELENGTH = 8
FUNCTIONS
Private Function ArrayPush(ByRef ArrayOriginal() As SnakePart, ByRef ElementToAdd As SnakePart) As SnakePart()
Dim NewLength As Long
Dim CopiedBytes As Long
Dim NewBytes As Long
NewLength = UBound(ArrayOriginal) + 1
ReDim ArrayPush(NewLength)
CopiedBytes = NewLength * SNAKEPART_BYTELENGTH
NewBytes = SNAKEPART_BYTELENGTH
CopyMemoryI ArrayElementGetPointer(ArrayPush, 0, SNAKEPART_BYTELENGTH), ArrayElementGetPointer(ArrayOriginal, 0, SNAKEPART_BYTELENGTH), CopiedBytes
CopyMemoryI ArrayElementGetPointer(ArrayPush, NewLength, SNAKEPART_BYTELENGTH), VarPtr(ElementToAdd), NewBytes
End Function
Private Function ArrayPop(ByRef ArrayOriginal() As SnakePart) As SnakePart()
Dim NewLength As Long
Dim CopiedBytes As Long
NewLength = UBound(ArrayOriginal) - 1
ReDim ArrayPop(NewLength)
CopiedBytes = UBound(ArrayOriginal) * SNAKEPART_BYTELENGTH
CopyMemoryI ArrayElementGetPointer(ArrayPop, 0, SNAKEPART_BYTELENGTH), ArrayElementGetPointer(ArrayOriginal(), 0, SNAKEPART_BYTELENGTH), CopiedBytes
End Function
Private Function ArrayShift(ByRef ArrayOriginal() As SnakePart, ByRef ElementToAdd As SnakePart) As SnakePart()
Dim NewLength As Long
Dim CopiedBytes As Long
Dim NewBytes As Long
NewLength = UBound(ArrayOriginal) + 1
ReDim ArrayShift(NewLength)
CopiedBytes = NewLength * SNAKEPART_BYTELENGTH
NewBytes = SNAKEPART_BYTELENGTH
CopyMemoryI ArrayElementGetPointer(ArrayShift, 1, SNAKEPART_BYTELENGTH), ArrayElementGetPointer(ArrayOriginal, 0, SNAKEPART_BYTELENGTH), CopiedBytes
CopyMemoryI ArrayElementGetPointer(ArrayShift, 0, SNAKEPART_BYTELENGTH), VarPtr(ElementToAdd), NewBytes
End Function
Private Function ArrayUnshift(ByRef ArrayOriginal() As SnakePart) As SnakePart()
Dim NewLength As Long
Dim CopiedBytes As Long
NewLength = UBound(ArrayOriginal) - 1
ReDim ArrayUnshift(NewLength)
CopiedBytes = UBound(ArrayOriginal) * SNAKEPART_BYTELENGTH
CopyMemoryI ArrayElementGetPointer(ArrayUnshift, 0, SNAKEPART_BYTELENGTH), ArrayElementGetPointer(ArrayOriginal, 1, SNAKEPART_BYTELENGTH), CopiedBytes
End Function
Private Function ArrayElementGetPointer(ByRef Arr() As SnakePart, ByVal ElementIndex As Long, ByVal ElementByteLength As Long) As LongPtr
Dim ptrToArrayVar As LongPtr
Dim ptrToSafeArray As LongPtr
Dim ptrToArrayData As LongPtr
Dim ptrCursor As LongPtr
Dim uSAFEARRAY As SAFEARRAY
' Get Pointer To Array *Variable*
ptrToArrayVar = VarPtrArray(Arr)
' Get Pointer To Array Variable *SAFEARRAY* By Directly Reading Array Variable
CopyMemoryI VarPtr(ptrToSafeArray), ptrToArrayVar, 8
' Read The SAFEARRAY Structure
CopyMemoryII uSAFEARRAY, ptrToSafeArray, LenB(uSAFEARRAY)
' Get Pointer To Array Data
ptrToArrayData = uSAFEARRAY.pvData
' Get Pointer To Array Element
ptrCursor = ptrToArrayData + (ElementIndex * ElementByteLength)
ArrayElementGetPointer = ptrCursor
End Function
TESTS
Private Sub test()
Dim x(3) As SnakePart
Dim sp As SnakePart
sp.Column = 1
sp.Row = 1
x(0) = sp
x(1) = sp
x(2) = sp
x(3) = sp
' expect all 1s
Debug.Print x(0).Column
Debug.Print x(1).Column
Debug.Print x(2).Column
Debug.Print x(3).Column
Debug.Print "_______________________"
sp.Column = 2
Dim temparry() As SnakePart
temparry = x
temparry = ArrayPush(temparry, sp)
Debug.Print "expect 2 at end"
Debug.Print temparry(0).Column
Debug.Print temparry(1).Column
Debug.Print temparry(2).Column
Debug.Print temparry(3).Column
Debug.Print temparry(4).Column
Debug.Print "_______________________"
temparry = ArrayPop(temparry)
Debug.Print "expect all 1"
Debug.Print temparry(0).Column
Debug.Print temparry(1).Column
Debug.Print temparry(2).Column
Debug.Print temparry(3).Column
Debug.Print "_______________________"
temparry = ArrayShift(temparry, sp)
Debug.Print "expect 2 at start"
Debug.Print temparry(0).Column
Debug.Print temparry(1).Column
Debug.Print temparry(2).Column
Debug.Print temparry(3).Column
Debug.Print temparry(4).Column
Debug.Print "_______________________"
temparry = ArrayUnshift(temparry)
Debug.Print "expect all 1"
Debug.Print temparry(0).Column
Debug.Print temparry(1).Column
Debug.Print temparry(2).Column
Debug.Print temparry(3).Column
End Sub
array vba excel vectors winapi
edited 25 mins ago
200_success
130k17156420
asked Mar 18 at 5:06
learnAsWeGolearnAsWeGo
2987
$endgroup$
2
$begingroup$
Quick thing, I've got to ask why you useDebug.Printrather thanDebug.Assertfor your tests, the latter will actually let you know when something has gone wrong - rather than relying on your eyes to tell you. Or indeed switch to Rubberduck for some proper unit tests
$endgroup$
– Greedo
Mar 19 at 10:50
$begingroup$
had never seen .assert used, will explore. thanks. i have rubber duck but have barely gotten the indentation features working, will look into the unit testing. just time!!
$endgroup$
– learnAsWeGo
Mar 19 at 13:54
$begingroup$
by got working i mean understand how to use!
$endgroup$
– learnAsWeGo
Mar 20 at 13:47
add a comment |
2
2
2
$begingroup$
I want to write my snake game procedurally, using as much windows call as I can so as to practice. Looking into GetAsyncKeyState to capture keyboard inputs and play sound functions. Also making a sweet user interface. Fun!
Also shout to bytecomb for providing example as to how to traverse the array structure, used his code function to find ptr to element in array!!
API CALLS
Option Explicit
Private Declare PtrSafe Function VarPtrArray Lib "VBE7" Alias "VarPtr" _
(ByRef Var() As Any) As LongPtr
Private Declare PtrSafe Sub CopyMemoryI Lib "kernel32.dll" Alias "RtlMoveMemory" _
(ByVal dst As LongPtr, ByVal src As LongPtr, ByVal Length As Long)
Private Declare PtrSafe Sub CopyMemoryII Lib "kernel32.dll" Alias "RtlMoveMemory" _
(ByRef dst As SAFEARRAY, ByVal src As LongPtr, ByVal Length As Long)
Private Declare PtrSafe Function GetAsyncKeyState Lib "user32" _
(ByVal vKey As Long) As Boolean
DATA STRUCTS
Private Type SAFEARRAY_BOUND
cElements As Long
lLbound As Long
End Type
Private Type SAFEARRAY
cDims As Integer
fFeatures As Integer
cbElements As Long
cLocks As Long
pvData As LongPtr
rgsabound(0) As SAFEARRAY_BOUND
End Type
Private Type SnakePart
Column As Long
Row As Long
End Type
Private Const SNAKEPART_BYTELENGTH = 8
FUNCTIONS
Private Function ArrayPush(ByRef ArrayOriginal() As SnakePart, ByRef ElementToAdd As SnakePart) As SnakePart()
Dim NewLength As Long
Dim CopiedBytes As Long
Dim NewBytes As Long
NewLength = UBound(ArrayOriginal) + 1
ReDim ArrayPush(NewLength)
CopiedBytes = NewLength * SNAKEPART_BYTELENGTH
NewBytes = SNAKEPART_BYTELENGTH
CopyMemoryI ArrayElementGetPointer(ArrayPush, 0, SNAKEPART_BYTELENGTH), ArrayElementGetPointer(ArrayOriginal, 0, SNAKEPART_BYTELENGTH), CopiedBytes
CopyMemoryI ArrayElementGetPointer(ArrayPush, NewLength, SNAKEPART_BYTELENGTH), VarPtr(ElementToAdd), NewBytes
End Function
Private Function ArrayPop(ByRef ArrayOriginal() As SnakePart) As SnakePart()
Dim NewLength As Long
Dim CopiedBytes As Long
NewLength = UBound(ArrayOriginal) - 1
ReDim ArrayPop(NewLength)
CopiedBytes = UBound(ArrayOriginal) * SNAKEPART_BYTELENGTH
CopyMemoryI ArrayElementGetPointer(ArrayPop, 0, SNAKEPART_BYTELENGTH), ArrayElementGetPointer(ArrayOriginal(), 0, SNAKEPART_BYTELENGTH), CopiedBytes
End Function
Private Function ArrayShift(ByRef ArrayOriginal() As SnakePart, ByRef ElementToAdd As SnakePart) As SnakePart()
Dim NewLength As Long
Dim CopiedBytes As Long
Dim NewBytes As Long
NewLength = UBound(ArrayOriginal) + 1
ReDim ArrayShift(NewLength)
CopiedBytes = NewLength * SNAKEPART_BYTELENGTH
NewBytes = SNAKEPART_BYTELENGTH
CopyMemoryI ArrayElementGetPointer(ArrayShift, 1, SNAKEPART_BYTELENGTH), ArrayElementGetPointer(ArrayOriginal, 0, SNAKEPART_BYTELENGTH), CopiedBytes
CopyMemoryI ArrayElementGetPointer(ArrayShift, 0, SNAKEPART_BYTELENGTH), VarPtr(ElementToAdd), NewBytes
End Function
Private Function ArrayUnshift(ByRef ArrayOriginal() As SnakePart) As SnakePart()
Dim NewLength As Long
Dim CopiedBytes As Long
NewLength = UBound(ArrayOriginal) - 1
ReDim ArrayUnshift(NewLength)
CopiedBytes = UBound(ArrayOriginal) * SNAKEPART_BYTELENGTH
CopyMemoryI ArrayElementGetPointer(ArrayUnshift, 0, SNAKEPART_BYTELENGTH), ArrayElementGetPointer(ArrayOriginal, 1, SNAKEPART_BYTELENGTH), CopiedBytes
End Function
Private Function ArrayElementGetPointer(ByRef Arr() As SnakePart, ByVal ElementIndex As Long, ByVal ElementByteLength As Long) As LongPtr
Dim ptrToArrayVar As LongPtr
Dim ptrToSafeArray As LongPtr
Dim ptrToArrayData As LongPtr
Dim ptrCursor As LongPtr
Dim uSAFEARRAY As SAFEARRAY
' Get Pointer To Array *Variable*
ptrToArrayVar = VarPtrArray(Arr)
' Get Pointer To Array Variable *SAFEARRAY* By Directly Reading Array Variable
CopyMemoryI VarPtr(ptrToSafeArray), ptrToArrayVar, 8
' Read The SAFEARRAY Structure
CopyMemoryII uSAFEARRAY, ptrToSafeArray, LenB(uSAFEARRAY)
' Get Pointer To Array Data
ptrToArrayData = uSAFEARRAY.pvData
' Get Pointer To Array Element
ptrCursor = ptrToArrayData + (ElementIndex * ElementByteLength)
ArrayElementGetPointer = ptrCursor
End Function
TESTS
Private Sub test()
Dim x(3) As SnakePart
Dim sp As SnakePart
sp.Column = 1
sp.Row = 1
x(0) = sp
x(1) = sp
x(2) = sp
x(3) = sp
' expect all 1s
Debug.Print x(0).Column
Debug.Print x(1).Column
Debug.Print x(2).Column
Debug.Print x(3).Column
Debug.Print "_______________________"
sp.Column = 2
Dim temparry() As SnakePart
temparry = x
temparry = ArrayPush(temparry, sp)
Debug.Print "expect 2 at end"
Debug.Print temparry(0).Column
Debug.Print temparry(1).Column
Debug.Print temparry(2).Column
Debug.Print temparry(3).Column
Debug.Print temparry(4).Column
Debug.Print "_______________________"
temparry = ArrayPop(temparry)
Debug.Print "expect all 1"
Debug.Print temparry(0).Column
Debug.Print temparry(1).Column
Debug.Print temparry(2).Column
Debug.Print temparry(3).Column
Debug.Print "_______________________"
temparry = ArrayShift(temparry, sp)
Debug.Print "expect 2 at start"
Debug.Print temparry(0).Column
Debug.Print temparry(1).Column
Debug.Print temparry(2).Column
Debug.Print temparry(3).Column
Debug.Print temparry(4).Column
Debug.Print "_______________________"
temparry = ArrayUnshift(temparry)
Debug.Print "expect all 1"
Debug.Print temparry(0).Column
Debug.Print temparry(1).Column
Debug.Print temparry(2).Column
Debug.Print temparry(3).Column
End Sub
array vba excel vectors winapi
edited 25 mins ago
200_success
130k17156420
asked Mar 18 at 5:06
learnAsWeGolearnAsWeGo
2987
$endgroup$
I want to write my snake game procedurally, using as much windows call as I can so as to practice. Looking into GetAsyncKeyState to capture keyboard inputs and play sound functions. Also making a sweet user interface. Fun!
Also shout to bytecomb for providing example as to how to traverse the array structure, used his code function to find ptr to element in array!!
API CALLS
Option Explicit
Private Declare PtrSafe Function VarPtrArray Lib "VBE7" Alias "VarPtr" _
(ByRef Var() As Any) As LongPtr
Private Declare PtrSafe Sub CopyMemoryI Lib "kernel32.dll" Alias "RtlMoveMemory" _
(ByVal dst As LongPtr, ByVal src As LongPtr, ByVal Length As Long)
Private Declare PtrSafe Sub CopyMemoryII Lib "kernel32.dll" Alias "RtlMoveMemory" _
(ByRef dst As SAFEARRAY, ByVal src As LongPtr, ByVal Length As Long)
Private Declare PtrSafe Function GetAsyncKeyState Lib "user32" _
(ByVal vKey As Long) As Boolean
DATA STRUCTS
Private Type SAFEARRAY_BOUND
cElements As Long
lLbound As Long
End Type
Private Type SAFEARRAY
cDims As Integer
fFeatures As Integer
cbElements As Long
cLocks As Long
pvData As LongPtr
rgsabound(0) As SAFEARRAY_BOUND
End Type
Private Type SnakePart
Column As Long
Row As Long
End Type
Private Const SNAKEPART_BYTELENGTH = 8
FUNCTIONS
Private Function ArrayPush(ByRef ArrayOriginal() As SnakePart, ByRef ElementToAdd As SnakePart) As SnakePart()
Dim NewLength As Long
Dim CopiedBytes As Long
Dim NewBytes As Long
NewLength = UBound(ArrayOriginal) + 1
ReDim ArrayPush(NewLength)
CopiedBytes = NewLength * SNAKEPART_BYTELENGTH
NewBytes = SNAKEPART_BYTELENGTH
CopyMemoryI ArrayElementGetPointer(ArrayPush, 0, SNAKEPART_BYTELENGTH), ArrayElementGetPointer(ArrayOriginal, 0, SNAKEPART_BYTELENGTH), CopiedBytes
CopyMemoryI ArrayElementGetPointer(ArrayPush, NewLength, SNAKEPART_BYTELENGTH), VarPtr(ElementToAdd), NewBytes
End Function
Private Function ArrayPop(ByRef ArrayOriginal() As SnakePart) As SnakePart()
Dim NewLength As Long
Dim CopiedBytes As Long
NewLength = UBound(ArrayOriginal) - 1
ReDim ArrayPop(NewLength)
CopiedBytes = UBound(ArrayOriginal) * SNAKEPART_BYTELENGTH
CopyMemoryI ArrayElementGetPointer(ArrayPop, 0, SNAKEPART_BYTELENGTH), ArrayElementGetPointer(ArrayOriginal(), 0, SNAKEPART_BYTELENGTH), CopiedBytes
End Function
Private Function ArrayShift(ByRef ArrayOriginal() As SnakePart, ByRef ElementToAdd As SnakePart) As SnakePart()
Dim NewLength As Long
Dim CopiedBytes As Long
Dim NewBytes As Long
NewLength = UBound(ArrayOriginal) + 1
ReDim ArrayShift(NewLength)
CopiedBytes = NewLength * SNAKEPART_BYTELENGTH
NewBytes = SNAKEPART_BYTELENGTH
CopyMemoryI ArrayElementGetPointer(ArrayShift, 1, SNAKEPART_BYTELENGTH), ArrayElementGetPointer(ArrayOriginal, 0, SNAKEPART_BYTELENGTH), CopiedBytes
CopyMemoryI ArrayElementGetPointer(ArrayShift, 0, SNAKEPART_BYTELENGTH), VarPtr(ElementToAdd), NewBytes
End Function
Private Function ArrayUnshift(ByRef ArrayOriginal() As SnakePart) As SnakePart()
Dim NewLength As Long
Dim CopiedBytes As Long
NewLength = UBound(ArrayOriginal) - 1
ReDim ArrayUnshift(NewLength)
CopiedBytes = UBound(ArrayOriginal) * SNAKEPART_BYTELENGTH
CopyMemoryI ArrayElementGetPointer(ArrayUnshift, 0, SNAKEPART_BYTELENGTH), ArrayElementGetPointer(ArrayOriginal, 1, SNAKEPART_BYTELENGTH), CopiedBytes
End Function
Private Function ArrayElementGetPointer(ByRef Arr() As SnakePart, ByVal ElementIndex As Long, ByVal ElementByteLength As Long) As LongPtr
Dim ptrToArrayVar As LongPtr
Dim ptrToSafeArray As LongPtr
Dim ptrToArrayData As LongPtr
Dim ptrCursor As LongPtr
Dim uSAFEARRAY As SAFEARRAY
' Get Pointer To Array *Variable*
ptrToArrayVar = VarPtrArray(Arr)
' Get Pointer To Array Variable *SAFEARRAY* By Directly Reading Array Variable
CopyMemoryI VarPtr(ptrToSafeArray), ptrToArrayVar, 8
' Read The SAFEARRAY Structure
CopyMemoryII uSAFEARRAY, ptrToSafeArray, LenB(uSAFEARRAY)
' Get Pointer To Array Data
ptrToArrayData = uSAFEARRAY.pvData
' Get Pointer To Array Element
ptrCursor = ptrToArrayData + (ElementIndex * ElementByteLength)
ArrayElementGetPointer = ptrCursor
End Function
TESTS
Private Sub test()
Dim x(3) As SnakePart
Dim sp As SnakePart
sp.Column = 1
sp.Row = 1
x(0) = sp
x(1) = sp
x(2) = sp
x(3) = sp
' expect all 1s
Debug.Print x(0).Column
Debug.Print x(1).Column
Debug.Print x(2).Column
Debug.Print x(3).Column
Debug.Print "_______________________"
sp.Column = 2
Dim temparry() As SnakePart
temparry = x
temparry = ArrayPush(temparry, sp)
Debug.Print "expect 2 at end"
Debug.Print temparry(0).Column
Debug.Print temparry(1).Column
Debug.Print temparry(2).Column
Debug.Print temparry(3).Column
Debug.Print temparry(4).Column
Debug.Print "_______________________"
temparry = ArrayPop(temparry)
Debug.Print "expect all 1"
Debug.Print temparry(0).Column
Debug.Print temparry(1).Column
Debug.Print temparry(2).Column
Debug.Print temparry(3).Column
Debug.Print "_______________________"
temparry = ArrayShift(temparry, sp)
Debug.Print "expect 2 at start"
Debug.Print temparry(0).Column
Debug.Print temparry(1).Column
Debug.Print temparry(2).Column
Debug.Print temparry(3).Column
Debug.Print temparry(4).Column
Debug.Print "_______________________"
temparry = ArrayUnshift(temparry)
Debug.Print "expect all 1"
Debug.Print temparry(0).Column
Debug.Print temparry(1).Column
Debug.Print temparry(2).Column
Debug.Print temparry(3).Column
End Sub
array vba excel vectors winapi
array vba excel vectors winapi
edited 25 mins ago
200_success
130k17156420
asked Mar 18 at 5:06
learnAsWeGolearnAsWeGo
2987
edited 25 mins ago
200_success
130k17156420
asked Mar 18 at 5:06
learnAsWeGolearnAsWeGo
2987
edited 25 mins ago
200_success
130k17156420
edited 25 mins ago
200_success
130k17156420
edited 25 mins ago
200_success
130k17156420
130k17156420
asked Mar 18 at 5:06
learnAsWeGolearnAsWeGo
2987
asked Mar 18 at 5:06
learnAsWeGolearnAsWeGo
2987
asked Mar 18 at 5:06
learnAsWeGolearnAsWeGo
2987
2987
2
$begingroup$
Quick thing, I've got to ask why you useDebug.Printrather thanDebug.Assertfor your tests, the latter will actually let you know when something has gone wrong - rather than relying on your eyes to tell you. Or indeed switch to Rubberduck for some proper unit tests
$endgroup$
– Greedo
Mar 19 at 10:50
$begingroup$
had never seen .assert used, will explore. thanks. i have rubber duck but have barely gotten the indentation features working, will look into the unit testing. just time!!
$endgroup$
– learnAsWeGo
Mar 19 at 13:54
$begingroup$
by got working i mean understand how to use!
$endgroup$
– learnAsWeGo
Mar 20 at 13:47
add a comment |
2
$begingroup$
Quick thing, I've got to ask why you useDebug.Printrather thanDebug.Assertfor your tests, the latter will actually let you know when something has gone wrong - rather than relying on your eyes to tell you. Or indeed switch to Rubberduck for some proper unit tests
$endgroup$
– Greedo
Mar 19 at 10:50
$begingroup$
had never seen .assert used, will explore. thanks. i have rubber duck but have barely gotten the indentation features working, will look into the unit testing. just time!!
$endgroup$
– learnAsWeGo
Mar 19 at 13:54
$begingroup$
by got working i mean understand how to use!
$endgroup$
– learnAsWeGo
Mar 20 at 13:47
2
2
$begingroup$
Quick thing, I've got to ask why you use
Debug.Print rather than Debug.Assert for your tests, the latter will actually let you know when something has gone wrong - rather than relying on your eyes to tell you. Or indeed switch to Rubberduck for some proper unit tests$endgroup$
– Greedo
Mar 19 at 10:50
$begingroup$
Quick thing, I've got to ask why you use
Debug.Print rather than Debug.Assert for your tests, the latter will actually let you know when something has gone wrong - rather than relying on your eyes to tell you. Or indeed switch to Rubberduck for some proper unit tests$endgroup$
– Greedo
Mar 19 at 10:50
$begingroup$
had never seen .assert used, will explore. thanks. i have rubber duck but have barely gotten the indentation features working, will look into the unit testing. just time!!
$endgroup$
– learnAsWeGo
Mar 19 at 13:54
$begingroup$
had never seen .assert used, will explore. thanks. i have rubber duck but have barely gotten the indentation features working, will look into the unit testing. just time!!
$endgroup$
– learnAsWeGo
Mar 19 at 13:54
$begingroup$
by got working i mean understand how to use!
$endgroup$
– learnAsWeGo
Mar 20 at 13:47
$begingroup$
by got working i mean understand how to use!
$endgroup$
– learnAsWeGo
Mar 20 at 13:47
add a comment |
0
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2
$begingroup$
Quick thing, I've got to ask why you use
Debug.Printrather thanDebug.Assertfor your tests, the latter will actually let you know when something has gone wrong - rather than relying on your eyes to tell you. Or indeed switch to Rubberduck for some proper unit tests$endgroup$
– Greedo
Mar 19 at 10:50
$begingroup$
had never seen .assert used, will explore. thanks. i have rubber duck but have barely gotten the indentation features working, will look into the unit testing. just time!!
$endgroup$
– learnAsWeGo
Mar 19 at 13:54
$begingroup$
by got working i mean understand how to use!
$endgroup$
– learnAsWeGo
Mar 20 at 13:47