使用VB.NET调用带有字符指针的非托管C DLL

我对如何正确调用非托管C DLL函数做了大量研究，该函数包含一个字符指针，可以作为字符串传递到VB.NET，但我仍然遇到访问冲突异常，代码如下

<DllImport("Sdk.dll")> _
Public Function Get_FileNameAt(ByVal pointer As IntPtr, ByVal index As UInt32, <MarshalAs(UnmanagedType.LPWStr)> ByVal name As StringBuilder, ByVal capacity As UInt32) As Integer
End Function

Dim StrName As New StringBuilder(256)
Dim pointer As IntPtr = IntPtr.Zero
Get_FileNameAt(pointer, 1, StrName, 256)

---

提前感谢。

For

char*

的可能副本应该是

LPStr

，因为它不是Unicode。

Public Declare Function Get_FileNameAt Lib "Sdk.dll" (Byref pointer As IntPtr, ByVal index As UInt32, ByVal name As StringBuilder, ByVal capacity As UInt32) As Integer
End Function

Dim StrName As StringBuilder = New StringBuilder(256)
'Dim pointer As IntPtr = IntPtr.Zero  (IntPtr.Zero should pass directly because it's read-only)
Get_FileNameAt(IntPtr.Zero, 1, StrName, 256)

Public Declare Function Get_FileNameAt Lib "Sdk.dll" (Byref pointer As IntPtr, ByVal index As UInt32, ByVal name As StringBuilder, ByVal capacity As UInt32) As Integer
End Function

Dim StrName As StringBuilder = New StringBuilder(256)
'Dim pointer As IntPtr = IntPtr.Zero  (IntPtr.Zero should pass directly because it's read-only)
Get_FileNameAt(IntPtr.Zero, 1, StrName, 256)