Blitz3D buffer and C++ ?

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Filax

I want to wrap the directx7 function with c++ :
SetTexture

but when i try to use with blitz it there is an error message : "Memory access violation"

Here is the C++ code:

BBDECL int BBCALL SetTexture(int Stage,IDirectDrawSurface7 *TextureBuffer)
{
	if (p_D3DDevice)
	{
		if (TextureBuffer)
		{
			int hr = p_D3DDevice->SetTexture(Stage,TextureBuffer);
			if (hr != 0)
				return 1;
		}
		else
		{
			return 2;
		}
	}
	return 0;
}

-----------------------------------------------------------------------------------

BBDECL is macro : extern "C" _desclspec(dllexport)
BBCALL is macro : _stdcall

p_D3DDevice is pointer of D3D Device initialised before with another functions.

The DECLS file

.lib "MyLib.dll"

SetTexture%(Stage,TextureBuffer) : "_SetTexture@8"

The blitz code

Graphics3D 800,600,0,2

; Get your system properties
DX7_GetDX7Handle()

; Simple Texture
Texture = CreateTexture(16,16)
LockBuffer TextureBuffer(Texture)
UnLockBuffer TextureBuffer(Texture)
; C++ Functions <<<<<<<<<<<<<<<<<<<<<<<<<
HR = SetTexture(0,Texturebuffer(Texture))
debuglog HR

Waitkey()
FreeTexture Texture
End

Any idea ? ! :)