Calling IRichEditOle interface methods

Niara · 01-16-2009, 10:48 AM

Hello, I'm not able to figure out how to call a method from IRichEditOle interface. I posted in C board instead of Windows board because I think that's a C synthax problem, but feel free to move it if necessary.

I'm totaly lost and confused, that's the case: the IRichEditOle interface is defined as follows

Code:

#define INTERFACE IRichEditOle
DECLARE_INTERFACE_(IRichEditOle, IUnknown)
{
	STDMETHOD(QueryInterface)(THIS_ REFIID,PVOID*) PURE;
	STDMETHOD_(ULONG,AddRef)(THIS) PURE;
	STDMETHOD_(ULONG,Release)(THIS) PURE;
	STDMETHOD(GetClientSite)(THIS_ LPOLECLIENTSITE*) PURE;
	STDMETHOD_(LONG,GetObjectCount)(THIS) PURE;
	STDMETHOD_(LONG,GetLinkCount)(THIS) PURE;
	STDMETHOD(GetObject)(THIS_ LONG, REOBJECT*,DWORD) PURE;
	STDMETHOD(InsertObject)(THIS_ REOBJECT*) PURE;
	STDMETHOD(ConvertObject)(THIS_ LONG,REFCLSID,LPCSTR) PURE;
	STDMETHOD(ActivateAs)(THIS_ REFCLSID,REFCLSID) PURE;
	STDMETHOD(SetHostNames)(THIS_ LPCSTR,LPCSTR) PURE;
	STDMETHOD(SetLinkAvailable)(THIS_ LONG,BOOL) PURE;
	STDMETHOD(SetDvaspect)(THIS_ LONG,DWORD) PURE;
	STDMETHOD(HandsOffStorage)(THIS_ LONG) PURE;
	STDMETHOD(SaveCompleted)(THIS_ LONG,LPSTORAGE) PURE;
	STDMETHOD(InPlaceDeactivate)(THIS) PURE;
	STDMETHOD(ContextSensitiveHelp)(THIS_ BOOL) PURE;
	STDMETHOD(GetClipboardData)(THIS_ CHARRANGE*,DWORD,LPDATAOBJECT*) PURE;
	STDMETHOD(ImportDataObject)(THIS_ LPDATAOBJECT,CLIPFORMAT,HGLOBAL) PURE;
};
typedef IRichEditOle *LPRICHEDITOLE;

In some code samples I've found over the net, they say that's possible to access to every interface methods as it was a struct member. In that case I get a handle to the IRichEditOle of a richedit control with:

Code:

LPRICHEDITOLE lp_richedit;
SendMessage(rich_edit_handle,EM_GETOLEINTERFACE,0,(LPARAM)&lp_richedit)

At this point I should be able to call whatever method using:

Code:

lp_richedit->method(arguments);
//to realease the interface handle I should use Release(), so:
lp_richedit->Release();

But the compiler ends with the next error:

Code:

structure has no member named 'Release'

I have linked all the libraries for the header files used in it, but I suspect that the problem is in the call synthax. How should I do that?

I'm using DevCpp with MingW, and the code is C compiled as C.

Thank's in advance
Niara

adeyblue · 01-16-2009, 12:35 PM

You have to call them through the vtable and pass the object as the this pointer manually. Like this

Code:

IRichEditOle* ole = whatever;
ole->lpVtbl->GetObjectCount(ole);

Niara · 01-16-2009, 01:23 PM

Hi adeyblue, thank's for your time and help.

That works as you said.

I'm not sure about that, but I can remember (a little flash) that I have read here in cboard (or in a link from here) something about creating virtual functions (virtual function table) in plain C to work like C++ classes; I assume that is a sample of that. I'll have a deeper look at it.

Thank's for the help
Niara

01-16-2009, 12:35 PM	#2
adeyblue I have a hat!? Join Date: Apr 2008 Posts: 178	You have to call them through the vtable and pass the object as the this pointer manually. Like this Code: IRichEditOle* ole = whatever; ole->lpVtbl->GetObjectCount(ole);
adeyblue is offline

01-16-2009, 01:23 PM	#3
Niara Registered User Join Date: Mar 2005 Location: Juneda Posts: 229	Hi adeyblue, thank's for your time and help. That works as you said. I'm not sure about that, but I can remember (a little flash) that I have read here in cboard (or in a link from here) something about creating virtual functions (virtual function table) in plain C to work like C++ classes; I assume that is a sample of that. I'll have a deeper look at it. Thank's for the help Niara
Niara is offline

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