所以我有這個調用DLL代碼的VBA代碼。 DLL代碼工作正常,VBA代碼工作正常,直到我從VBA調用DLL函數。出於某種原因,它沒有正確傳遞第六個參數。我通過添加第7個參數並在第6個和第7個參數中傳遞相同的值進行測試 - 第7個傳遞正常,第6個傳遞相同的大(不正確)值。我不知道發生了什麼。VBA Excel DLL參數問題 - 第六個參數
VBA:
Option Explicit
' Declare the LMM Function that's in the DLL
Declare PtrSafe Function GenCudaLMMPaths Lib "C:\Path to DLL\LMMExcel.dll" Alias "GenerateCUDALMMPaths" (xTimes#, xRates#, xVols#, xRData#, ByRef ArrLen As Long, ByRef NPaths As Long) As Long
' Generate LMM Paths on Click
Sub LMM_Click()
Dim Times#(), Rates#(), Vols#()
Dim x As Long
Dim y As Long
Dim rTimes As Range
Dim rRates As Range
Dim rVols As Range
Dim cell As Range
Dim sz As Long
sz = 15
' Resize
ReDim Times(sz), Rates(sz), Vols(sz)
' Fill in Data
Set rTimes = Sheets("Market").Range("C2:Q2")
x = 1
For Each cell In rTimes
Times(x) = cell.Value
x = x + 1
Next
Set rRates = Sheets("Market").Range("C5:Q5")
x = 1
For Each cell In rRates
Rates(x) = cell.Value
x = x + 1
Next
Set rVols = Sheets("Market").Range("C4:Q4")
x = 1
For Each cell In rVols
Vols(x) = cell.Value/10000
x = x + 1
Next
'Call the Function
Dim np As Long
np = Sheets("LMM").Range("C2").Value
Dim useCuda As Boolean
If Sheets("LMM").Range("C3").Value = "GPU" Then
useCuda = True
Else
useCuda = False
End If
Dim rData#()
Dim rValue
ReDim rData(np * sz * (sz + 3))
rValue = GenCudaLMMPaths(Times(1), Rates(1), Vols(1), rData(1), sz, np)
If rValue = -1 Then
'No CUDA Card
MsgBox ("Your system doesn't have a CUDA Enabled GPU")
ElseIf rValue = 1 Then
'Error Occurred
MsgBox ("An error occurred while trying to generate LMM paths")
ElseIf rValue = 0 Then
'Success
' Need to reformat return data
Dim fmtData()
ReDim fmtData(np * sz, sz)
Dim i, j, k
For i = 0 To np - 1
For j = 0 To np - 1
For k = 0 To np - 1
fmtData(((i * sz) + j) + 1, k + 1) = rData(((i * sz * sz) + (j * sz) + k) + 1)
Next k
Next j
Next i
'Fill in data
Sheets("LMM").Range("A8:K" & (np * sz)) = fmtData
Else
'Too many requested paths for this CUDA card
MsgBox ("In order to prevent GPU Lock-up, you cannot request more than " & rValue & " paths.")
Sheets("LMM").Range("C2").Value = rValue
End If
End Sub
DLL函數聲明:
int __stdcall GenerateCUDALMMPaths(double* arrTimes, double* arrRates, double* arrVols, double* retData, int& ArrLength, int& NPaths);
DEF文件:
LIBRARY "CUDAFinance"
EXPORTS
CheckExcelArray = CheckExcelArray
GenerateLMMPaths = GenerateLMMPaths
GenerateCUDALMMPaths = GenerateCUDALMMPaths
任何人有任何想法嗎?我完全失去了。
你能舉出傳遞值的例子嗎? – 2014-03-27 15:52:28
也許這會起作用,'np = CLng(Sheets(「LMM」)。Range(「C2」)。Value)' – hstay
我相信你需要通過「ByVal」而不是「ByRef」我想你說過你在前面的問題中已經試過了......我正在查找更多。另外,你在哪裏看到大的不正確值出現?調試DLL,還是在VBA的某處? – MattB