通用型XPCOM模块宏
宏
作用
NS_IMPL_NSGETMODULE(name, components)
实现IModule接口
NS_IMPL_NSGETMODULE_WITH_CTOR(name, components, ctor)
同上，但允许指定模块创建时调用一个特定函数
NS_IMPL_NSGETMODULE_WITH_DTOR
(name, components, dtor)
同第一个，但允许指定模块销毁时调用一个特定函数
NS_IMPL_NSGETMODULE_WITH_CTOR_DTOR
(name, components, ctor, dtor)
结合2，3
模块实现宏：
nsModuleComponentInfo结构体包含4个域：1）给人读的类名称 2）类ID(CID) 3)契约ID 4)用于给定对象的构造者
static const nsModuleComponentInfo components[] =
{
{ "Pretty Class Name",
CID,
CONTRACT_ID,
Constructor
},
.
}
工厂宏：
NS_GENERIC_FACTORY_CONSTRUCTOR(ConcreteClass)
常用实现宏
NS_IMPL_ISUPPORTS1(classname, interface1)
NS_IMPL_ISUPPORTSn(classname, interface1, …, interfacen)
声明宏：
class myEnumerator : public nsISimpleEnumerator
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSISIMPLEENUMERATOR
myEnumerator();
virtual ~myEnumerator() {}
};
NS_IMPL_ISUPPORTSn
为指定类实现nsISupports，此类有n个接口
NS_DECL_ISUPPORTS
声明ISuppotrs接口的方法，包含mRefCnt
NS_INIT_ISUPPORTS
初始化mRefCnt为0
NS_GET_IID
返回给定接口名称的IID
智能指针
{
nsCOMPtr<nsISupports> value;
object->method(getter_AddRefs(value));
if (!value) return;
if (NS_FAILED(error))
return;
}
SomeClass::Get(nsISupports** aResult)
{
if (! aResult)
return NS_ERROR_NULL_POINTER;
nsCOMPtr<nsISupports> value;
object->method(getter_AddRefs(value));
*aResult = value.get();
NS_IF_ADDREF(*aResult);
return NS_OK;
}
示例：
#include "nsIGenericFactory.h"
#define SAMPLE_CID \
{ 0x777f7150, 0x4a2b, 0x4301, \
{ 0xad, 0x10, 0x5e, 0xab, 0x25, 0xb3, 0x22, 0xaa}}
class Sample: public nsISupports
{
public:
Sample();
virtual ~Sample();
NS_DECL_ISUPPORTS
};
Sample::Sample()
{
// note: in newer versions of Gecko (1.3 or later)
// you don’t have to do this:
NS_INIT_ISUPPORTS();
}
Sample::~Sample()
{
}
NS_IMPL_ISUPPORTS(Sample, nsISupports);
NS_GENERIC_FACTORY_CONSTRUCTOR(Sample);
static const nsModuleComponentInfo components[] =
{
{ "Pretty Class Name",
SAMPLE_CID,
"@company.com/sample"
SampleConstructor
}
};
NS_IMPL_NSGETMODULE(nsSampleModule, components)
本文转自Phinecos(洞庭散人)博客园博客，原文链接：http://www.cnblogs.com/phinecos/archive/2008/06/02/1212338.html，如需转载请自行联系原作者