Calling function with pointer from a C like dll into a C# program.

[Calin]

I'm trying to build a wrapper but the pointer gives me a hard time.

the C code:

typedef enum
{
MANYMOUSE_EVENT _ABSMOTION = 0,
MANYMOUSE_EVENT _RELMOTION,
MANYMOUSE_EVENT _BUTTON,
MANYMOUSE_EVENT _SCROLL,
MANYMOUSE_EVENT _DISCONNECT,
MANYMOUSE_EVENT _MAX
} ManyMouseEventT ype;

__declspec(dlle xport) typedef struct
{
ManyMouseEventT ype type;
unsigned int device;
unsigned int item;
int value;
int minval;
int maxval;
} ManyMouseEvent;

__declspec(dlle xport) int ManyMouse_PollE vent(ManyMouseE vent *event);

C# code:

[DllImport("Many MouseDLL.dll")]
public static extern int ManyMouse_PollE vent( );

[Calin]

Re: Calling function with pointer from a C like dll into a C# program.

I think I've figured it to a certain degree but I still don't know how
to 'fix' the enumeration.

[DllImport("Many MouseDLL.dll",C harSet = CharSet.Ansi)]
internal static extern int
ManyMouse_PollE vent([MarshalAs(Unman agedType.LPStru ct)] ManyMouseEvent
MouseEvent);

[StructLayout (LayoutKind.Seq uential)]
internal struct ManyMouseEvent
{

public int device;
public int item;
public int value;
public int minval;
public int maxval;
};


Any help is appreciated

On Mar 29, 4:32 am, "Calin" <calinne...@gma il.comwrote:

I'm trying to build a wrapper but the pointer gives me a hard time.
>
the C code:
>
typedef enum
{
MANYMOUSE_EVENT _ABSMOTION = 0,
MANYMOUSE_EVENT _RELMOTION,
MANYMOUSE_EVENT _BUTTON,
MANYMOUSE_EVENT _SCROLL,
MANYMOUSE_EVENT _DISCONNECT,
MANYMOUSE_EVENT _MAX
>
} ManyMouseEventT ype;
>
__declspec(dlle xport) typedef struct
{
ManyMouseEventT ype type;
unsigned int device;
unsigned int item;
int value;
int minval;
int maxval;
>
} ManyMouseEvent;
>
__declspec(dlle xport) int ManyMouse_PollE vent(ManyMouseE vent *event);
>
C# code:
>
[DllImport("Many MouseDLL.dll")]
public static extern int ManyMouse_PollE vent( );

[Mattias Sjögren]

Re: Calling function with pointer from a C like dll into a C# program.

>I think I've figured it to a certain degree but I still don't know how

>to 'fix' the enumeration.

What you have is almost valid C# code. Just strip off the typedef
stuff.

enum ManyMouseEventT ype
{
MANYMOUSE_EVENT _ABSMOTION = 0,
MANYMOUSE_EVENT _RELMOTION,
MANYMOUSE_EVENT _BUTTON,
MANYMOUSE_EVENT _SCROLL,
MANYMOUSE_EVENT _DISCONNECT,
MANYMOUSE_EVENT _MAX
}

>[DllImport("Many MouseDLL.dll",C harSet = CharSet.Ansi)]
internal static extern int
>ManyMouse_Poll Event([MarshalAs(Unman agedType.LPStru ct)] ManyMouseEvent
>MouseEvent);

Make that

internal static extern int ManyMouse_PollE vent(ref ManyMouseEvent
MouseEvent);


Mattias

--
Mattias Sjögren [C# MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

[Calin]

Re: Calling function with pointer from a C like dll into a C# program.

On Mar 29, 10:02 pm, Mattias Sjögren <mattias.dont.w ant.s...@mvps.o rg>
wrote:

I think I've figured it to a certain degree but I still don't know how
to 'fix' the enumeration.

>
What you have is almost valid C# code. Just strip off the typedef
stuff.
>
enum ManyMouseEventT ype
{
MANYMOUSE_EVENT _ABSMOTION = 0,
MANYMOUSE_EVENT _RELMOTION,
MANYMOUSE_EVENT _BUTTON,
MANYMOUSE_EVENT _SCROLL,
MANYMOUSE_EVENT _DISCONNECT,
MANYMOUSE_EVENT _MAX
>
}

[DllImport("Many MouseDLL.dll",C harSet = CharSet.Ansi)]
internal static extern int
ManyMouse_PollE vent([MarshalAs(Unman agedType.LPStru ct)] ManyMouseEvent
MouseEvent);

>
Make that
>
internal static extern int ManyMouse_PollE vent(ref ManyMouseEvent
MouseEvent);
>
Mattias
>
--
Mattias Sjögren [C# MVP] mattias @ mvps.orghttp://www.msjogren.ne t/dotnet/|http://www.dotnetinterop.com
Please reply only to the newsgroup.

Thanks that works fine.