CODEWITHSUNDEEP
c#.netvb.netpinvokemarshalling
Qqbt
Qqbt

Reputation: 812

Marshalling an array of array of structs (2D struct array)

I have a 3rd party DLL containing the following function:

SDK_API FunctionInQuestion(char* name, myStruct table[row][column]);

I'm pretty sure this function WILL modify myStruct table[row][column].

I need to call this from .net, here is how I tried (the used language is VB.NET, but if you know how to do it in C# thats not a problem, I'm pretty sure the principles are the same)

<System.Runtime.InteropServices.DllImportAttribute("dllinquestion.dll", EntryPoint:="FunctionInQuestion", CallingConvention:=Runtime.InteropServices.CallingConvention.Cdecl)> _
Public Shared Function FunctionInQuestion(ByVal name As System.Text.StringBuilder, ByRef table()() As myStruct) As Integer
End Function

myStruct C:

typedef struct
{
   unsigned short int x;  
   unsigned short int y;  
}myStruct;

myStruct .net:

<Runtime.InteropServices.StructLayout(Runtime.InteropServices.LayoutKind.Sequential)> _
Public Structure myStruct
    Public x As UShort
    Public y As UShort
End Structure

I've been Googling/searching Stackoverflow for a couple hours now and tried every 'solution' thus far, but I haven't been able to make it work. Please if you redirect/vote to close the question, I beg you to first look at the other question. If it's really a marshalling of a 2D struct array AND you are sure the question contains an answer, then please by all means close this, all the better.

Upvotes: 1

Views: 165

Answers (1)

David Heffernan
David Heffernan

Reputation: 612884

You should marshal this as a simple linear array. I'm more familiar with C#, but in VB I think it would run like this:

ByVal table() As myStruct

Then you'll need to perform the 2D to 1D indexing conversion manually in the .net code.

Upvotes: 1

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