module std.c.windows.com;

private import std.c.windows.windows;
private import std.string;

alias WCHAR OLECHAR;
alias OLECHAR *LPOLESTR;
alias OLECHAR *LPCOLESTR;

enum
{
	rmm = 23,	// OLE 2 version number info
	rup = 639,
}

enum : int
{
	S_OK = 0,
	S_FALSE = 0x00000001,
	NOERROR = 0,
	E_NOTIMPL     = cast(int)0x80004001,
	E_NOINTERFACE = cast(int)0x80004002,
	E_POINTER     = cast(int)0x80004003,
	E_ABORT       = cast(int)0x80004004,
	E_FAIL        = cast(int)0x80004005,
	E_HANDLE      = cast(int)0x80070006,
	CLASS_E_NOAGGREGATION = cast(int)0x80040110,
	E_OUTOFMEMORY = cast(int)0x8007000E,
	E_INVALIDARG  = cast(int)0x80070057,
	E_UNEXPECTED  = cast(int)0x8000FFFF,
}

struct GUID {          // size is 16
    align(1):
	DWORD Data1;
	WORD  Data2;
	WORD  Data3;
	BYTE  Data4[8];
}

enum
{
	CLSCTX_INPROC_SERVER	= 0x1,
	CLSCTX_INPROC_HANDLER	= 0x2,
	CLSCTX_LOCAL_SERVER	= 0x4,
	CLSCTX_INPROC_SERVER16	= 0x8,
	CLSCTX_REMOTE_SERVER	= 0x10,
	CLSCTX_INPROC_HANDLER16	= 0x20,
	CLSCTX_INPROC_SERVERX86	= 0x40,
	CLSCTX_INPROC_HANDLERX86 = 0x80,

	CLSCTX_INPROC = (CLSCTX_INPROC_SERVER|CLSCTX_INPROC_HANDLER),
	CLSCTX_ALL = (CLSCTX_INPROC_SERVER| CLSCTX_INPROC_HANDLER| CLSCTX_LOCAL_SERVER),
	CLSCTX_SERVER = (CLSCTX_INPROC_SERVER|CLSCTX_LOCAL_SERVER),
}

alias GUID IID;
alias GUID CLSID;

extern (C)
{
    extern IID IID_IUnknown;
    extern IID IID_IClassFactory;
    extern IID IID_IMarshal;
    extern IID IID_IMallocSpy;
    extern IID IID_IStdMarshalInfo;
    extern IID IID_IExternalConnection;
    extern IID IID_IMultiQI;
    extern IID IID_IEnumUnknown;
    extern IID IID_IBindCtx;
    extern IID IID_IEnumMoniker;
    extern IID IID_IRunnableObject;
    extern IID IID_IRunningObjectTable;
    extern IID IID_IPersist;
    extern IID IID_IPersistStream;
    extern IID IID_IMoniker;
    extern IID IID_IROTData;
    extern IID IID_IEnumString;
    extern IID IID_ISequentialStream;
    extern IID IID_IStream;
    extern IID IID_IEnumSTATSTG;
    extern IID IID_IStorage;
    extern IID IID_IPersistFile;
    extern IID IID_IPersistStorage;
    extern IID IID_ILockBytes;
    extern IID IID_IEnumFORMATETC;
    extern IID IID_IEnumSTATDATA;
    extern IID IID_IRootStorage;
    extern IID IID_IAdviseSink;
    extern IID IID_IAdviseSink2;
    extern IID IID_IDataObject;
    extern IID IID_IDataAdviseHolder;
    extern IID IID_IMessageFilter;
    extern IID IID_IRpcChannelBuffer;
    extern IID IID_IRpcProxyBuffer;
    extern IID IID_IRpcStubBuffer;
    extern IID IID_IPSFactoryBuffer;
    extern IID IID_IPropertyStorage;
    extern IID IID_IPropertySetStorage;
    extern IID IID_IEnumSTATPROPSTG;
    extern IID IID_IEnumSTATPROPSETSTG;
    extern IID IID_IFillLockBytes;
    extern IID IID_IProgressNotify;
    extern IID IID_ILayoutStorage;
    extern IID GUID_NULL;
    extern IID IID_IRpcChannel;
    extern IID IID_IRpcStub;
    extern IID IID_IStubManager;
    extern IID IID_IRpcProxy;
    extern IID IID_IProxyManager;
    extern IID IID_IPSFactory;
    extern IID IID_IInternalMoniker;
    extern IID IID_IDfReserved1;
    extern IID IID_IDfReserved2;
    extern IID IID_IDfReserved3;
    extern IID IID_IStub;
    extern IID IID_IProxy;
    extern IID IID_IEnumGeneric;
    extern IID IID_IEnumHolder;
    extern IID IID_IEnumCallback;
    extern IID IID_IOleManager;
    extern IID IID_IOlePresObj;
    extern IID IID_IDebug;
    extern IID IID_IDebugStream;
    extern IID IID_StdOle;
    extern IID IID_ICreateTypeInfo;
    extern IID IID_ICreateTypeInfo2;
    extern IID IID_ICreateTypeLib;
    extern IID IID_ICreateTypeLib2;
    extern IID IID_IDispatch;
    extern IID IID_IEnumVARIANT;
    extern IID IID_ITypeComp;
    extern IID IID_ITypeInfo;
    extern IID IID_ITypeInfo2;
    extern IID IID_ITypeLib;
    extern IID IID_ITypeLib2;
    extern IID IID_ITypeChangeEvents;
    extern IID IID_IErrorInfo;
    extern IID IID_ICreateErrorInfo;
    extern IID IID_ISupportErrorInfo;
    extern IID IID_IOleAdviseHolder;
    extern IID IID_IOleCache;
    extern IID IID_IOleCache2;
    extern IID IID_IOleCacheControl;
    extern IID IID_IParseDisplayName;
    extern IID IID_IOleContainer;
    extern IID IID_IOleClientSite;
    extern IID IID_IOleObject;
    extern IID IID_IOleWindow;
    extern IID IID_IOleLink;
    extern IID IID_IOleItemContainer;
    extern IID IID_IOleInPlaceUIWindow;
    extern IID IID_IOleInPlaceActiveObject;
    extern IID IID_IOleInPlaceFrame;
    extern IID IID_IOleInPlaceObject;
    extern IID IID_IOleInPlaceSite;
    extern IID IID_IContinue;
    extern IID IID_IViewObject;
    extern IID IID_IViewObject2;
    extern IID IID_IDropSource;
    extern IID IID_IDropTarget;
    extern IID IID_IEnumOLEVERB;
}

extern (Windows)
{

export
{
DWORD   CoBuildVersion();

int StringFromGUID2(GUID *rguid, LPOLESTR lpsz, int cbMax);

/* init/uninit */

HRESULT CoInitialize(LPVOID pvReserved);
void    CoUninitialize();
DWORD   CoGetCurrentProcess();


HRESULT CoCreateInstance(CLSID *rclsid, IUnknown UnkOuter,
                    DWORD dwClsContext, IID* riid, void* ppv);

//HINSTANCE CoLoadLibrary(LPOLESTR lpszLibName, BOOL bAutoFree);
void    CoFreeLibrary(HINSTANCE hInst);
void    CoFreeAllLibraries();
void    CoFreeUnusedLibraries();
}

interface IUnknown
{
    HRESULT QueryInterface(IID* riid, void** pvObject);
    ULONG AddRef();
    ULONG Release();
}

interface IClassFactory : IUnknown
{
    HRESULT CreateInstance(IUnknown UnkOuter, IID* riid, void** pvObject);
    HRESULT LockServer(BOOL fLock);
}

class ComObject : IUnknown
{
extern (Windows):
    HRESULT QueryInterface(IID* riid, void** ppv)
    {
	if (*riid == IID_IUnknown)
	{
	    *ppv = (IUnknown)this;
	    AddRef();
	    return S_OK;
	}
	else
	{   *ppv = null;
	    return E_NOINTERFACE;
	}
    }

    ULONG AddRef()
    {
	return InterlockedIncrement(&count);
    }

    ULONG Release()
    {
	LONG lRef = InterlockedDecrement(&count);
	if (lRef == 0)
	{
	    // free object

	    // If we delete this object, then the postinvariant called upon
	    // return from Release() will fail.
	    // Just let the GC reap it.
	    //delete this;

	    return 0;
	}
	return (ULONG)lRef;
    }

    LONG count = 0;		// object reference count
}

}