/** @file * MS COM / XPCOM Abstraction Layer: * Common definitions */ /* * Copyright (C) 2006-2009 Sun Microsystems, Inc. * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. * * The contents of this file may alternatively be used under the terms * of the Common Development and Distribution License Version 1.0 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the * VirtualBox OSE distribution, in which case the provisions of the * CDDL are applicable instead of those of the GPL. * * You may elect to license modified versions of this file under the * terms and conditions of either the GPL or the CDDL or both. * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa * Clara, CA 95054 USA or visit http://www.sun.com if you need * additional information or have any questions. */ #ifndef ___VBox_com_defs_h #define ___VBox_com_defs_h /* Make sure all the stdint.h macros are included - must come first! */ #ifndef __STDC_LIMIT_MACROS # define __STDC_LIMIT_MACROS #endif #ifndef __STDC_CONSTANT_MACROS # define __STDC_CONSTANT_MACROS #endif #if defined (RT_OS_OS2) #if defined(RT_MAX) && RT_MAX != 22 # error RT_MAX already defined by ! Make sure \ is included before it. #endif /* Make sure OS/2 Toolkit headers are pulled in to have BOOL/ULONG/etc. typedefs * already defined in order to be able to redefine them using #define. It's * also important to do it before iprt/cdefs.h, otherwise we'll lose RT_MAX in * all code that uses COM Glue. */ #define INCL_BASE #define INCL_PM #include /* OS/2 Toolkit defines TRUE and FALSE */ #undef FALSE #undef TRUE #endif /* defined (RT_OS_OS2) */ /* Include iprt/types.h (which also includes iprt/types.h) now to make sure iprt * gets to stdint.h first, otherwise a system/xpcom header might beat us and * we'll be without the macros that are optional in C++. */ #include #if !defined (VBOX_WITH_XPCOM) #if defined (RT_OS_WINDOWS) // Windows COM ///////////////////////////////////////////////////////////////////////////// #include #ifndef VBOX_COM_NO_ATL # include #include #endif #define NS_DECL_ISUPPORTS #define NS_IMPL_ISUPPORTS1_CI(a, b) /* these are XPCOM only, one for every interface implemented */ #define NS_DECL_ISUPPORTS #define NS_DECL_IVIRTUALBOX #define NS_DECL_IMACHINECOLLECTION #define NS_DECL_IMACHINE /** Returns @c true if @a rc represents a warning result code */ #define SUCCEEDED_WARNING(rc) (SUCCEEDED (rc) && (rc) != S_OK) /** Immutable BSTR string */ typedef const OLECHAR *CBSTR; /** Input BSTR argument of interface method declaration. */ #define IN_BSTR BSTR /** Input GUID argument of interface method declaration. */ #define IN_GUID GUID /** Output GUID argument of interface method declaration. */ #define OUT_GUID GUID* /** Makes the name of the getter interface function (n must be capitalized). */ #define COMGETTER(n) get_##n /** Makes the name of the setter interface function (n must be capitalized). */ #define COMSETTER(n) put_##n /** * Declares an input safearray parameter in the COM method implementation. Also * used to declare the COM attribute setter parameter. Corresponds to either of * the following XIDL definitions: * 
 *  
 *  ...
 *  
 *
* * The method implementation should use the com::SafeArray helper class to work * with parameters declared using this define. * * @param aType Array element type. * @param aArg Parameter/attribute name. */ #define ComSafeArrayIn(aType, aArg) SAFEARRAY **aArg /** * Expands to @true if the given input safearray parameter is a "null pointer" * which makes it impossible to use it for reading safearray data. */ #define ComSafeArrayInIsNull(aArg) ((aArg) == NULL || *(aArg) == NULL) /** * Wraps the given parameter name to generate an expression that is suitable for * passing the parameter to functions that take input safearray parameters * declared using the ComSafeArrayIn marco. * * @param aArg Parameter name to wrap. The given parameter must be declared * within the calling function using the ComSafeArrayIn macro. */ #define ComSafeArrayInArg(aArg) aArg /** * Declares an output safearray parameter in the COM method implementation. Also * used to declare the COM attribute getter parameter. Corresponds to either of * the following XIDL definitions: * 
 *  
 *  
 *  ...
 *  
 *
* * The method implementation should use the com::SafeArray helper class to work * with parameters declared using this define. * * @param aType Array element type. * @param aArg Parameter/attribute name. */ #define ComSafeArrayOut(aType, aArg) SAFEARRAY **aArg /** * Expands to @true if the given output safearray parameter is a "null pointer" * which makes it impossible to use it for returning a safearray. */ #define ComSafeArrayOutIsNull(aArg) ((aArg) == NULL) /** * Wraps the given parameter name to generate an expression that is suitable for * passing the parameter to functions that take output safearray parameters * declared using the ComSafeArrayOut marco. * * @param aArg Parameter name to wrap. The given parameter must be declared * within the calling function using the ComSafeArrayOut macro. */ #define ComSafeArrayOutArg(aArg) aArg /** * Version of ComSafeArrayIn for GUID. * @param aArg Parameter name to wrap. */ #define ComSafeGUIDArrayIn(aArg) SAFEARRAY **aArg /** * Version of ComSafeArrayInIsNull for GUID. * @param aArg Parameter name to wrap. */ #define ComSafeGUIDArrayInIsNull(aArg) ComSafeArrayInIsNull (aArg) /** * Version of ComSafeArrayInArg for GUID. * @param aArg Parameter name to wrap. */ #define ComSafeGUIDArrayInArg(aArg) ComSafeArrayInArg (aArg) /** * Version of ComSafeArrayOut for GUID. * @param aArg Parameter name to wrap. */ #define ComSafeGUIDArrayOut(aArg) SAFEARRAY **aArg /** * Version of ComSafeArrayOutIsNull for GUID. * @param aArg Parameter name to wrap. */ #define ComSafeGUIDArrayOutIsNull(aArg) ComSafeArrayOutIsNull (aArg) /** * Version of ComSafeArrayOutArg for GUID. * @param aArg Parameter name to wrap. */ #define ComSafeGUIDArrayOutArg(aArg) ComSafeArrayOutArg (aArg) /** * Returns the const reference to the IID (i.e., |const GUID &|) of the given * interface. * * @param i interface class */ #define COM_IIDOF(I) _ATL_IIDOF (I) #else /* defined (RT_OS_WINDOWS) */ #error "VBOX_WITH_XPCOM must be defined on a platform other than Windows!" #endif /* defined (RT_OS_WINDOWS) */ #else /* !defined (VBOX_WITH_XPCOM) */ // XPCOM ///////////////////////////////////////////////////////////////////////////// #if defined (RT_OS_DARWIN) || (defined (QT_VERSION) && (QT_VERSION >= 0x040000)) /* CFBase.h defines these & * qglobal.h from Qt4 defines these */ # undef FALSE # undef TRUE #endif /* RT_OS_DARWIN || QT_VERSION */ #include #define ATL_NO_VTABLE #define DECLARE_CLASSFACTORY(a) #define DECLARE_CLASSFACTORY_SINGLETON(a) #define DECLARE_REGISTRY_RESOURCEID(a) #define DECLARE_NOT_AGGREGATABLE(a) #define DECLARE_PROTECT_FINAL_CONSTRUCT(a) #define BEGIN_COM_MAP(a) #define COM_INTERFACE_ENTRY(a) #define COM_INTERFACE_ENTRY2(a,b) #define END_COM_MAP(a) #define HRESULT nsresult #define SUCCEEDED NS_SUCCEEDED #define FAILED NS_FAILED #define SUCCEEDED_WARNING(rc) (NS_SUCCEEDED (rc) && (rc) != NS_OK) #define IUnknown nsISupports #define BOOL PRBool #define BYTE PRUint8 #define SHORT PRInt16 #define USHORT PRUint16 #define LONG PRInt32 #define ULONG PRUint32 #define LONG64 PRInt64 #define ULONG64 PRUint64 #define FALSE PR_FALSE #define TRUE PR_TRUE #define OLECHAR wchar_t /* note: typedef to semantically match BSTR on Win32 */ typedef PRUnichar *BSTR; typedef const PRUnichar *CBSTR; typedef BSTR *LPBSTR; /** Input BSTR argument the interface method declaration. */ #define IN_BSTR CBSTR /** * Type to define a raw GUID variable (for members use the com::Guid class * instead). */ #define GUID nsID /** Input GUID argument the interface method declaration. */ #define IN_GUID const nsID & /** Output GUID argument the interface method declaration. */ #define OUT_GUID nsID ** /** Makes the name of the getter interface function (n must be capitalized). */ #define COMGETTER(n) Get##n /** Makes the name of the setter interface function (n must be capitalized). */ #define COMSETTER(n) Set##n /* safearray input parameter macros */ #define ComSafeArrayIn(aType, aArg) PRUint32 aArg##Size, aType *aArg #define ComSafeArrayInIsNull(aArg) ((aArg) == NULL) #define ComSafeArrayInArg(aArg) aArg##Size, aArg /* safearray output parameter macros */ #define ComSafeArrayOut(aType, aArg) PRUint32 *aArg##Size, aType **aArg #define ComSafeArrayOutIsNull(aArg) ((aArg) == NULL) #define ComSafeArrayOutArg(aArg) aArg##Size, aArg /* safearray input parameter macros for GUID */ #define ComSafeGUIDArrayIn(aArg) PRUint32 aArg##Size, const nsID **aArg #define ComSafeGUIDArrayInIsNull(aArg) ComSafeArrayInIsNull (aArg) #define ComSafeGUIDArrayInArg(aArg) ComSafeArrayInArg (aArg) /* safearray output parameter macros for GUID */ #define ComSafeGUIDArrayOut(aArg) PRUint32 *aArg##Size, nsID ***aArg #define ComSafeGUIDArrayOutIsNull(aArg) ComSafeArrayOutIsNull (aArg) #define ComSafeGUIDArrayOutArg(aArg) ComSafeArrayOutArg (aArg) /* CLSID and IID for compatibility with Win32 */ typedef nsCID CLSID; typedef nsIID IID; /* OLE error codes */ #define S_OK ((nsresult) NS_OK) #define E_UNEXPECTED NS_ERROR_UNEXPECTED #define E_NOTIMPL NS_ERROR_NOT_IMPLEMENTED #define E_OUTOFMEMORY NS_ERROR_OUT_OF_MEMORY #define E_INVALIDARG NS_ERROR_INVALID_ARG #define E_NOINTERFACE NS_ERROR_NO_INTERFACE #define E_POINTER NS_ERROR_NULL_POINTER #define E_ABORT NS_ERROR_ABORT #define E_FAIL NS_ERROR_FAILURE /* Note: a better analog for E_ACCESSDENIED would probably be * NS_ERROR_NOT_AVAILABLE, but we want binary compatibility for now. */ #define E_ACCESSDENIED ((nsresult) 0x80070005L) #define STDMETHOD(a) NS_IMETHOD a #define STDMETHODIMP NS_IMETHODIMP #define COM_IIDOF(I) NS_GET_IID (I) /* Two very simple ATL emulator classes to provide * FinalConstruct()/FinalRelease() functionality on Linux. */ class CComObjectRootEx { public: HRESULT FinalConstruct() { return S_OK; } void FinalRelease() {} }; template class CComObject : public Base { public: virtual ~CComObject() { this->FinalRelease(); } }; /* helper functions */ extern "C" { BSTR SysAllocString (const OLECHAR* sz); BSTR SysAllocStringByteLen (char *psz, unsigned int len); BSTR SysAllocStringLen (const OLECHAR *pch, unsigned int cch); void SysFreeString (BSTR bstr); int SysReAllocString (BSTR *pbstr, const OLECHAR *psz); int SysReAllocStringLen (BSTR *pbstr, const OLECHAR *psz, unsigned int cch); unsigned int SysStringByteLen (BSTR bstr); unsigned int SysStringLen (BSTR bstr); } /** * 'Constructor' for the component class. * This constructor, as opposed to NS_GENERIC_FACTORY_CONSTRUCTOR, * assumes that the component class is derived from the CComObjectRootEx<> * template, so it calls FinalConstruct() right after object creation * and ensures that FinalRelease() will be called right before destruction. * The result from FinalConstruct() is returned to the caller. */ #define NS_GENERIC_FACTORY_CONSTRUCTOR_WITH_RC(_InstanceClass) \ static NS_IMETHODIMP \ _InstanceClass##Constructor(nsISupports *aOuter, REFNSIID aIID, \ void **aResult) \ { \ nsresult rv; \ \ *aResult = NULL; \ if (NULL != aOuter) { \ rv = NS_ERROR_NO_AGGREGATION; \ return rv; \ } \ \ CComObject <_InstanceClass> *inst = new CComObject <_InstanceClass>(); \ if (NULL == inst) { \ rv = NS_ERROR_OUT_OF_MEMORY; \ return rv; \ } \ \ NS_ADDREF(inst); /* protect FinalConstruct() */ \ rv = inst->FinalConstruct(); \ if (NS_SUCCEEDED(rv)) \ rv = inst->QueryInterface(aIID, aResult); \ NS_RELEASE(inst); \ \ return rv; \ } /** * 'Constructor' that uses an existing getter function that gets a singleton. * The getter function must have the following prototype: * nsresult _GetterProc (_InstanceClass **inst) * This constructor, as opposed to NS_GENERIC_FACTORY_SINGLETON_CONSTRUCTOR, * lets the getter function return a result code that is passed back to the * caller that tries to instantiate the object. * NOTE: assumes that getter does an AddRef - so additional AddRef is not done. */ #define NS_GENERIC_FACTORY_SINGLETON_CONSTRUCTOR_WITH_RC(_InstanceClass, _GetterProc) \ static NS_IMETHODIMP \ _InstanceClass##Constructor(nsISupports *aOuter, REFNSIID aIID, \ void **aResult) \ { \ nsresult rv; \ \ _InstanceClass * inst; \ \ *aResult = NULL; \ if (NULL != aOuter) { \ rv = NS_ERROR_NO_AGGREGATION; \ return rv; \ } \ \ rv = _GetterProc(&inst); \ if (NS_FAILED(rv)) \ return rv; \ \ /* sanity check */ \ if (NULL == inst) \ return NS_ERROR_OUT_OF_MEMORY; \ \ /* NS_ADDREF(inst); */ \ if (NS_SUCCEEDED(rv)) { \ rv = inst->QueryInterface(aIID, aResult); \ } \ NS_RELEASE(inst); \ \ return rv; \ } #endif /* !defined (VBOX_WITH_XPCOM) */ /** * Declares a wchar_t string literal from the argument. * Necessary to overcome MSC / GCC differences. * @param s expression to stringify */ #if defined (_MSC_VER) # define WSTR_LITERAL(s) L#s #elif defined (__GNUC__) # define WSTR_LITERAL(s) L""#s #else # error "Unsupported compiler!" #endif namespace com { /** * "First worst" result type. * * Variables of this class are used instead of HRESULT variables when it is * desirable to memorize the "first worst" result code instead of the last * assigned one. In other words, an assignment operation to a variable of this * class will succeed only if the result code to assign has worse severity. The * following table demonstrate this (the first column lists the previous result * code stored in the variable, the first row lists the new result code being * assigned, 'A' means the assignment will take place, '> S_OK' means a warning * result code): * * {{{ * FAILED > S_OK S_OK * FAILED - - - * > S_OK A - - * S_OK A A - * * }}} * * In practice, you will need to use a FWResult variable when you call some COM * method B after another COM method A fails and want to return the result code * of A even if B also fails, but want to return the failed result code of B if * A issues a warning or succeeds. */ class FWResult { public: /** * Constructs a new variable. Note that by default this constructor sets the * result code to E_FAIL to make sure a failure is returned to the caller if * the variable is never assigned another value (which is considered as the * improper use of this class). */ FWResult (HRESULT aRC = E_FAIL) : mRC (aRC) {} FWResult &operator= (HRESULT aRC) { if ((FAILED (aRC) && !FAILED (mRC)) || (mRC == S_OK && aRC != S_OK)) mRC = aRC; return *this; } operator HRESULT() const { return mRC; } HRESULT *operator&() { return &mRC; } private: HRESULT mRC; }; /** * "Last worst" result type. * * Variables of this class are used instead of HRESULT variables when it is * desirable to memorize the "last worst" result code instead of the last * assigned one. In other words, an assignment operation to a variable of this * class will succeed only if the result code to assign has the same or worse * severity. The following table demonstrate this (the first column lists the * previous result code stored in the variable, the first row lists the new * assigned, 'A' means the assignment will take place, '> S_OK' means a warning * result code): * * {{{ * FAILED > S_OK S_OK * FAILED A - - * > S_OK A A - * S_OK A A - * * }}} * * In practice, you will need to use a LWResult variable when you call some COM * method B after COM method A fails and want to return the result code of B * if B also fails, but still want to return the failed result code of A if B * issues a warning or succeeds. */ class LWResult { public: /** * Constructs a new variable. Note that by default this constructor sets the * result code to E_FAIL to make sure a failure is returned to the caller if * the variable is never assigned another value (which is considered as the * improper use of this class). */ LWResult (HRESULT aRC = E_FAIL) : mRC (aRC) {} LWResult &operator= (HRESULT aRC) { if (FAILED (aRC) || (SUCCEEDED (mRC) && aRC != S_OK)) mRC = aRC; return *this; } operator HRESULT() const { return mRC; } HRESULT *operator&() { return &mRC; } private: HRESULT mRC; }; } /* namespace com */ #endif /* ___VBox_com_defs_h */