从VBA应用程序调用C DLL并返回数组的步骤如下:
__declspec(dllexport)
)将函数导出为DLL的可用函数。Declare
语句声明DLL函数的原型。确保声明与DLL函数的参数和返回类型匹配。LoadLibrary
函数加载DLL文件。可以使用Declare
语句声明LoadLibrary
函数的原型。GetProcAddress
函数获取DLL中导出函数的地址。可以使用Declare
语句声明GetProcAddress
函数的原型。FreeLibrary
函数卸载DLL。可以使用Declare
语句声明FreeLibrary
函数的原型。以下是一个示例代码,展示了如何从VBA应用程序调用C DLL并返回数组:
Option Explicit
Declare Function LoadLibrary Lib "kernel32" Alias "LoadLibraryA" (ByVal lpLibFileName As String) As Long
Declare Function GetProcAddress Lib "kernel32" (ByVal hModule As Long, ByVal lpProcName As String) As Long
Declare Function FreeLibrary Lib "kernel32" (ByVal hLibModule As Long) As Long
Declare Function MyDLLFunction Lib "MyDLL.dll" (ByRef inputArray() As Double, ByVal size As Long) As Long
Sub CallDLL()
Dim hModule As Long
Dim pFunc As Long
Dim inputArray(1 To 5) As Double
Dim result As Long
Dim i As Long
' 加载DLL
hModule = LoadLibrary("MyDLL.dll")
If hModule <> 0 Then
' 获取函数地址
pFunc = GetProcAddress(hModule, "MyDLLFunction")
If pFunc <> 0 Then
' 调用DLL函数
result = MyDLLFunction(inputArray(1), UBound(inputArray))
' 输出结果
For i = 1 To UBound(inputArray)
Debug.Print inputArray(i)
Next i
Else
MsgBox "无法获取DLL函数地址。"
End If
' 卸载DLL
FreeLibrary hModule
Else
MsgBox "无法加载DLL。"
End If
End Sub
请注意,上述示例代码仅为演示目的,实际情况中需要根据具体的DLL函数和参数进行调整。
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