calling c++-exported dll functions from vb.net

[RA Scheltema]

hi all,

I have the following function defined in the header-file of a c++ project
struct DataType
{
...
};

long __stdcall my_func(DataType** ptr);

Now we have a double pointer (this has something to do with hidden
data-types, so this is un-avoidable). My question is, how would i go about
calling this function from a visual basic project (complete with marshaling
code).

Any help would be greatly appreciated !

richard

[Mattias Sjögren]

Now we have a double pointer (this has something to do with hidden
data-types, so this is un-avoidable). My question is, how would i go about
calling this function from a visual basic project (complete with marshaling
code).

It depends on if the double indirection is there because you're
supposed to pass in an array of DataType pointers, or if the function
returns a DataType pointer to you. One of these should hopefully work

Declare Function my_func Lib "your.dll" (ByRef ptr As IntPtr) As
Integer

Declare Function my_func Lib "your.dll" (ByVal ptr() As IntPtr) As
Integer

Mattias

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Mattias Sjögren [MVP] mattias @ mvps.org
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