Passing an array between VB.Net and C++ and back

  • Thread starter Thread starter T
  • Start date Start date
T

T

I am working on a project that requires VB.Net code in one project in the
solution to call C++ code in another project in the same solution.

I have already figured out that I have to set up the C++ class like this:
Header file-

typedef unsigned char u8;
typedef unsigned int u32;

Cpp file-

__gc public class TpcTool
{
protected:
TpcTool(){
}

public:
u32 bgra32_to_rgba32(u32 color) {
return color & 0xFF00FF00 | (color&0x00FF0000)>>16 |
(color&0x000000FF)<<16;
}

u8 * foo(u8 u) {
return &u;
}
};


and that I have to add a reference to the C++ project in my VB project. I
can "see" (via Intellisense) the
bgra32_to_rgba32() function but the second one yields an error message that
indicates that "foo has an incompatible return type..."
when I write this:

Dim v As TpcTool
v.foo(CByte(32))

The second function is not really what I'm trying to do, I just tried
something simple to see why I couldn't
return an array to my VB code.

Any ideas how to go about calling C++ routines that need to process and
array of bytes and return the same?

Thanks in advance to anyone who can render assistance!

Tom Luetz II
 
T said:
u8 * foo(u8 u) {
return &u;
}
};


and that I have to add a reference to the C++ project in my VB
project. I can "see" (via Intellisense) the
bgra32_to_rgba32() function but the second one yields an error
message that indicates that "foo has an incompatible return
type..." when I write this:

Dim v As TpcTool
v.foo(CByte(32))

The second function is not really what I'm trying to do, I just
tried something simple to see why I couldn't
return an array to my VB code.
Click to expand...

First, I probably can't help you. Yet ...

- Is it a managed assembly you created in C++? Otherwise it wouldn't be
possible to set a reference.
- I think an U8* is not CLSCompliant
- If you won't get an answer here =>
microsoft.public.dotnet.framework.interop
 
Back
Top