Wrapping a COM DLL

[Sam Martin]

hi all,

i've asked a similar question recently regarding accessing the Windows
Address Book by creating a wrapper class in C#

I need to know whether I'm barking up the wrong the tree?

What i've started doing is creating the required structs and declaring
function calls within the wab32.dll in managed code (C#) but the problem i'm
now faced with having to pass an pointer (IntPtr) to an interface as a
parameter to one of the functions.

Do i have to declare the interfaces i need as c# interfaces? or can i need
to DllImport them?

if you know what i'm talking about then you probably know i don't

any help / pointers appreciated

tia
Sam Martin

 

[Nicholas Paldino [.NET/C# MVP]]

Sam,

Which function are you trying to declare in wab32.dll? If you can give
the function (and possibly the unmanaged declaration) it would help
tremendously.

 

[Sam Martin]

hi nick,

thanks for reply,

it's
HRESULT WABOpen(
LPADRBOOK *lppAdrBook,
LPWABOBJECT *lppWABObject,
LPWAB_PARAM lpWABParam,
DWORD Reserved2
);

Basically i'm guessing the implementation would be something like

[DllImport("wab32.dll")]
static public extern uint WABOpen(ref IntPtr lppAdrBook, ref IntPtr
lppWABObject, ref IntPtr lpWABParam, uint Reserved2);

so you can obtain an IntPtr to an object (interface) that has a series of
methods, how do you then invoke those methods?

Thanks
Sam

Sam,

Which function are you trying to declare in wab32.dll? If you can give
the function (and possibly the unmanaged declaration) it would help
tremendously.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

hi all,

i've asked a similar question recently regarding accessing the Windows
Address Book by creating a wrapper class in C#

I need to know whether I'm barking up the wrong the tree?

What i've started doing is creating the required structs and declaring
function calls within the wab32.dll in managed code (C#) but the problem i'm
now faced with having to pass an pointer (IntPtr) to an interface as a
parameter to one of the functions.

Do i have to declare the interfaces i need as c# interfaces? or can i need
to DllImport them?

if you know what i'm talking about then you probably know i don't

any help / pointers appreciated

tia
Sam Martin

 

[Nicholas Paldino [.NET/C# MVP]]

Sam,

You should actually define the IAddrBook interface in your code (using
the appropriate ComImport and Guid attributes as well), and then set the
return type to that. The COM interop layer will take care of it. Just make
sure that the parameter type is "ref IAddrBook".


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

hi nick,

thanks for reply,

it's
HRESULT WABOpen(
LPADRBOOK *lppAdrBook,
LPWABOBJECT *lppWABObject,
LPWAB_PARAM lpWABParam,
DWORD Reserved2
);

Basically i'm guessing the implementation would be something like

[DllImport("wab32.dll")]
static public extern uint WABOpen(ref IntPtr lppAdrBook, ref IntPtr
lppWABObject, ref IntPtr lpWABParam, uint Reserved2);

so you can obtain an IntPtr to an object (interface) that has a series of
methods, how do you then invoke those methods?

Thanks
Sam





message news:%[email protected]...

Sam,

Which function are you trying to declare in wab32.dll? If you can give
the function (and possibly the unmanaged declaration) it would help
tremendously.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

hi all,

i've asked a similar question recently regarding accessing the Windows
Address Book by creating a wrapper class in C#

I need to know whether I'm barking up the wrong the tree?

What i've started doing is creating the required structs and declaring
function calls within the wab32.dll in managed code (C#) but the

problem
i'm

now faced with having to pass an pointer (IntPtr) to an interface as a
parameter to one of the functions.

Do i have to declare the interfaces i need as c# interfaces? or can i need
to DllImport them?

if you know what i'm talking about then you probably know i don't

any help / pointers appreciated

tia
Sam Martin

 

[Sam Martin]

ok, so i think i've got it

basically define the IAddrBook interface in c# - how do you know what Com
attribs to use
I've been looking for a while now and still no good examples of how to do
this. (normally the interop classes are created by tlbimp no?)

thanks again mate

sam

Sam,

You should actually define the IAddrBook interface in your code (using
the appropriate ComImport and Guid attributes as well), and then set the
return type to that. The COM interop layer will take care of it. Just make
sure that the parameter type is "ref IAddrBook".


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

hi nick,

thanks for reply,

it's
HRESULT WABOpen(
LPADRBOOK *lppAdrBook,
LPWABOBJECT *lppWABObject,
LPWAB_PARAM lpWABParam,
DWORD Reserved2
);

Basically i'm guessing the implementation would be something like

[DllImport("wab32.dll")]
static public extern uint WABOpen(ref IntPtr lppAdrBook, ref IntPtr
lppWABObject, ref IntPtr lpWABParam, uint Reserved2);

so you can obtain an IntPtr to an object (interface) that has a series of
methods, how do you then invoke those methods?

Thanks
Sam





message news:%[email protected]...

Sam,

Which function are you trying to declare in wab32.dll? If you can give
the function (and possibly the unmanaged declaration) it would help
tremendously.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

hi all,

i've asked a similar question recently regarding accessing the Windows
Address Book by creating a wrapper class in C#

I need to know whether I'm barking up the wrong the tree?

What i've started doing is creating the required structs and declaring
function calls within the wab32.dll in managed code (C#) but the problem
i'm
now faced with having to pass an pointer (IntPtr) to an interface as a
parameter to one of the functions.

Do i have to declare the interfaces i need as c# interfaces? or can

i
need

to DllImport them?

if you know what i'm talking about then you probably know i don't

any help / pointers appreciated

tia
Sam Martin

 

[Sam Martin]

cheers nick, found an ms tutorial on ComImport

if anyone finds this thread with same problem ... look here
http://msdn.microsoft.com/library/d.../html/vcwlkCOMInteropPart1CClientTutorial.asp

now off to laboriously retype ms's wab api... sweet

sam

ok, so i think i've got it

basically define the IAddrBook interface in c# - how do you know what Com
attribs to use
I've been looking for a while now and still no good examples of how to do
this. (normally the interop classes are created by tlbimp no?)

thanks again mate

sam


message news:[email protected]...

Sam,

You should actually define the IAddrBook interface in your code (using
the appropriate ComImport and Guid attributes as well), and then set the
return type to that. The COM interop layer will take care of it. Just make
sure that the parameter type is "ref IAddrBook".


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

hi nick,

thanks for reply,

it's
HRESULT WABOpen(
LPADRBOOK *lppAdrBook,
LPWABOBJECT *lppWABObject,
LPWAB_PARAM lpWABParam,
DWORD Reserved2
);

Basically i'm guessing the implementation would be something like

[DllImport("wab32.dll")]
static public extern uint WABOpen(ref IntPtr lppAdrBook, ref IntPtr
lppWABObject, ref IntPtr lpWABParam, uint Reserved2);

so you can obtain an IntPtr to an object (interface) that has a series of
methods, how do you then invoke those methods?

Thanks
Sam





"Nicholas Paldino [.NET/C# MVP]" <[email protected]>

wrote
in

message Sam,

Which function are you trying to declare in wab32.dll? If you can
give
the function (and possibly the unmanaged declaration) it would help
tremendously.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

hi all,

i've asked a similar question recently regarding accessing the Windows
Address Book by creating a wrapper class in C#

I need to know whether I'm barking up the wrong the tree?

What i've started doing is creating the required structs and declaring
function calls within the wab32.dll in managed code (C#) but the problem
i'm
now faced with having to pass an pointer (IntPtr) to an interface

as

a

can

i