Animated GIF Encoding Library

[Calculator]

Before I go and storm through the gif89a docs to create an animated gif encoder, is there an available C or C++ interface for turning a set of images into frames for an animated gif? I have heard of a mythical GIF89.DLL for the creation of GIF's but I have not found documentation. It only exports these

DllCanUnloadNow
DllGetClassObject
DllGetClassObject
DllUnregisterServer

I just want to create some animated GIF's now that the patent has expired!

[Mybowlcut]

I've always wanted to make something like that... will your animator be freeware?

[Yves M]

That's probably a COM dll, so open it with the OLEViewer to see which COM classes it exports and you can probably use those.

[Calculator]

I can't seem to get too much information out ofv the OLE-COM viewer. I am also not too experienced with COM services or servers or whatever. These interfaces are given

Object Instances
Drag and Drop Object
IAsyncOperation
IClientSecurity
IDataObject
IMarshal
IMultiQI
IUnknown

Object Classes
Grouped by Object Categories
...
OLE 1.0 Categories
...
COM Library Objects
...
All Objects
...

Application ID's
Type Libraries
Interfaces

I have looked at most of these and they don't seem to do anything special relating to the encoding of GIF images. Um, I want to dig at it more though, where should I look?

[Calculator]

I used a tool to generate a type library and came up with this

#ifndef __Gif89_h_
#define __Gif89_h_


#ifndef __RPC_H__
#include "rpc.h"
#endif
#ifndef __RPCNDR_H__
#include "rpcndr.h"
#endif
#include <ole2.h>
#ifndef __unknwn_h__
#include "unknwn.h"
#endif
#ifndef __objidl_h__
#include "objidl.h"
#endif
#ifndef __oaidl_h__
#include "oaidl.h"
#endif
#ifndef __ocidl_h__
#include "ocidl.h"
#endif

DEFINE_GUID(LIBID_Gif89, 0x28d47522,0xcf84,0x11d1,0x83, 0x4c, 0x0, 0xa0, 0x24, 0x9f, 0xc, 0x28);
/*
Gif89 1.0
*/

/* forward declares */
struct IGif89a;





DEFINE_GUID(CLSID_Gif89a, 0x28d47530,0xcf84,0x11d1,0x83, 0x4c, 0x0, 0xa0, 0x24, 0x9f, 0xc, 0x28);

#ifndef LCC_IGif89a_DEFINED
#define LCC_IGif89a_DEFINED

DEFINE_GUID(IID_IGif89a, 0x28d4752f,0xcf84,0x11d1,0x83, 0x4c, 0x0, 0xa0, 0x24, 0x9f, 0xc, 0x28);

typedef interface IGif89a IGif89a;

#undef INTERFACE
#define INTERFACE IGif89a

DECLARE_INTERFACE_(INTERFACE, IDispatch)
{
	HRESULT (STDMETHODCALLTYPE *QueryInterface)(IGif89a *This, GUID* riid, void** ppvObj);
	ULONG (STDMETHODCALLTYPE *AddRef)(IGif89a *This);
	ULONG (STDMETHODCALLTYPE *Release)(IGif89a *This);
	HRESULT (STDMETHODCALLTYPE *GetTypeInfoCount)(IGif89a *This, UINT* pctinfo);
	HRESULT (STDMETHODCALLTYPE *GetTypeInfo)(IGif89a *This, UINT itinfo, ULONG lcid, void** pptinfo);
	HRESULT (STDMETHODCALLTYPE *GetIDsOfNames)(IGif89a *This, GUID* riid, char** rgszNames, UINT cNames, ULONG lcid, LONG* rgdispid);
	HRESULT (STDMETHODCALLTYPE *Invoke)(IGif89a *This, LONG dispidMember, GUID* riid, ULONG lcid, USHORT wFlags, DISPPARAMS* pdispparams, VARIANT* pvarResult, EXCEPINFO* pexcepinfo, UINT* puArgErr);
	HRESULT (STDMETHODCALLTYPE *put_Enabled)(IGif89a *This, VARIANT_BOOL);
	HRESULT (STDMETHODCALLTYPE *get_Enabled)(IGif89a *This, VARIANT_BOOL *);
	HRESULT (STDMETHODCALLTYPE *get_Window)(IGif89a *This, LONG *);
	HRESULT (STDMETHODCALLTYPE *Play)(IGif89a *This);
	HRESULT (STDMETHODCALLTYPE *Stop)(IGif89a *This);
	HRESULT (STDMETHODCALLTYPE *get_AutoStart)(IGif89a *This, VARIANT_BOOL *);
	HRESULT (STDMETHODCALLTYPE *put_AutoStart)(IGif89a *This, VARIANT_BOOL);
	HRESULT (STDMETHODCALLTYPE *get_Speed)(IGif89a *This, LONG *);
	HRESULT (STDMETHODCALLTYPE *put_Speed)(IGif89a *This, LONG);
	HRESULT (STDMETHODCALLTYPE *get_Glass)(IGif89a *This, VARIANT_BOOL *);
	HRESULT (STDMETHODCALLTYPE *put_Glass)(IGif89a *This, VARIANT_BOOL);
	HRESULT (STDMETHODCALLTYPE *put_AutoSize)(IGif89a *This, VARIANT_BOOL);
	HRESULT (STDMETHODCALLTYPE *get_AutoSize)(IGif89a *This, VARIANT_BOOL *);
	HRESULT (STDMETHODCALLTYPE *get_Embed)(IGif89a *This, VARIANT_BOOL *);
	HRESULT (STDMETHODCALLTYPE *put_Embed)(IGif89a *This, VARIANT_BOOL);
	HRESULT (STDMETHODCALLTYPE *get_FileName)(IGif89a *This, BSTR *);
	HRESULT (STDMETHODCALLTYPE *put_FileName)(IGif89a *This, BSTR);
	HRESULT (STDMETHODCALLTYPE *AboutBox)(IGif89a *This);
};

#define IGif89a_QueryInterface(ip, p1, p2) (ip)->lpVtbl->QueryInterface(ip, p1, p2)
#define IGif89a_AddRef(ip, p1) (ip)->lpVtbl->AddRef(ip, p1)
#define IGif89a_Release(ip, p1) (ip)->lpVtbl->Release(ip, p1)
#define IGif89a_GetTypeInfoCount(ip, p1) (ip)->lpVtbl->GetTypeInfoCount(ip, p1)
#define IGif89a_GetTypeInfo(ip, p1, p2, p3) (ip)->lpVtbl->GetTypeInfo(ip, p1, p2, p3)
#define IGif89a_GetIDsOfNames(ip, p1, p2, p3, p4, p5) (ip)->lpVtbl->GetIDsOfNames(ip, p1, p2, p3, p4, p5)
#define IGif89a_Invoke(ip, p1, p2, p3, p4, p5, p6, p7, p8) (ip)->lpVtbl->Invoke(ip, p1, p2, p3, p4, p5, p6, p7, p8)
#define IGif89a_put_Enabled(ip, p1) (ip)->lpVtbl->put_Enabled(ip, p1)
#define IGif89a_get_Enabled(ip, p1) (ip)->lpVtbl->get_Enabled(ip, p1)
#define IGif89a_get_Window(ip, p1) (ip)->lpVtbl->get_Window(ip, p1)
#define IGif89a_Play(ip) (ip)->lpVtbl->Play(ip)
#define IGif89a_Stop(ip) (ip)->lpVtbl->Stop(ip)
#define IGif89a_get_AutoStart(ip, p1) (ip)->lpVtbl->get_AutoStart(ip, p1)
#define IGif89a_put_AutoStart(ip, p1) (ip)->lpVtbl->put_AutoStart(ip, p1)
#define IGif89a_get_Speed(ip, p1) (ip)->lpVtbl->get_Speed(ip, p1)
#define IGif89a_put_Speed(ip, p1) (ip)->lpVtbl->put_Speed(ip, p1)
#define IGif89a_get_Glass(ip, p1) (ip)->lpVtbl->get_Glass(ip, p1)
#define IGif89a_put_Glass(ip, p1) (ip)->lpVtbl->put_Glass(ip, p1)
#define IGif89a_put_AutoSize(ip, p1) (ip)->lpVtbl->put_AutoSize(ip, p1)
#define IGif89a_get_AutoSize(ip, p1) (ip)->lpVtbl->get_AutoSize(ip, p1)
#define IGif89a_get_Embed(ip, p1) (ip)->lpVtbl->get_Embed(ip, p1)
#define IGif89a_put_Embed(ip, p1) (ip)->lpVtbl->put_Embed(ip, p1)
#define IGif89a_get_FileName(ip, p1) (ip)->lpVtbl->get_FileName(ip, p1)
#define IGif89a_put_FileName(ip, p1) (ip)->lpVtbl->put_FileName(ip, p1)
#define IGif89a_AboutBox(ip) (ip)->lpVtbl->AboutBox(ip)

#endif // LCC_IGif89a_DEFINED




#endif // Gif89_h_