NPAPI插件编写学习记录01-优快云博客

本文详细介绍了如何使用Apple的插件技术开发基于Safari的电影播放器插件，包括初始化过程、实例结构、对象创建及方法实现等关键步骤，并提供了中文参考资料，帮助开发者快速上手。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

Apple官网示例：https://developer.apple.com/library/safari/samplecode/NPAPI_Core_Animation_Movie_Plugin/Introduction/Intro.html

项目名称：NetscapeCoreAnimationMoviePlugin

相关中文资料地址：http://www.tanhao.me/pieces/1084.html

一，main.m:

　　//通过此方法将浏览器的对象返回给插件

　　NPError NP_Initialize(NPNetscapeFuncs* browserFuncs)

　　{

　　browser = browserFuncs;

　　return NPERR_NO_ERROR;

　　}

// 每个实例存储结构typedef struct PluginObject
{
　　NPP npp;
    NPWindow window;
    CALayer *rootLayer;
    MovieControllerLayer *controllerLayer;
    QTMovieLayer *movieLayer;
    CALayer *mouseDownLayer;
    NSURL *movieURL;
    QTMovie *movie;
    // The NPObject for this scriptable object.
    NPObject *movieNPObject;
} PluginObject;

=============================

　　NP_GetEntryPoints{

　　　　...

　　　　pluginFuncs->getvalue = NPP_GetValue;

　　　　...

　　　　}

　　NPP_GetValue(NPP instance, NPPVariable variable, void *value)

{

......

　　obj->movieNPObject = createMovieNPObject(instance, obj->movie); <=== 【MovieNPObject.m:

NPObject *createMovieNPObject(NPP npp, QTMovie *movie) 】

......

}

二，MovieNPObject.m:

　　NPObject *createMovieNPObject(NPP npp, QTMovie *movie)

{

......

　　(MovieNPObject *)browser->createobject(npp, &movieNPClass);

......

}

static NPClass movieNPClass = {

NP_CLASS_STRUCT_VERSION,

movieNPObjectAllocate, // NP_Allocate

movieNPObjectDeallocate, // NP_Deallocate

0, // NP_Invalidate

movieNPObjectHasMethod, // NP_HasMethod

movieNPObjectInvoke, // NP_Invoke

0, // NP_InvokeDefault

0, // NP_HasProperty

0, // NP_GetProperty

0, // NP_SetProperty

0, // NP_RemoveProperty

0, // NP_Enumerate

0, // NP_Construct

};

static bool movieNPObjectHasMethod(NPObject *obj, NPIdentifier name)

{......}

static bool movieNPObjectInvoke(NPObject *npObject, NPIdentifier name, const NPVariant* args, uint32_t argCount, NPVariant* result)

{......}

===============

关于MovieControllerLayer

一，main.m:

typedef struct PluginObject

{

......

MovieControllerLayer *controllerLayer;

......

}

对controllerLayer的使用：

handleMouseDown{} ==> MovieControllerLayer类：MovieControllerLayer.m

handleMouseUp{}

handleMouseDragged{}

handleMouseEntered{}

handleMouseExited{}

setupLayerHierarchy{}

==============

================

MovieNPObject.m：
　　

static NPClass movieNPClass = {

NP_CLASS_STRUCT_VERSION,

movieNPObjectAllocate, // NP_Al

｝

static NPObject *movieNPObjectAllocate(NPP npp, NPClass* theClass)

{

initializeIdentifiers();

MovieNPObject *movieNPObject = malloc(sizeof(MovieNPObject));

movieNPObject->movie = 0;

return (NPObject *)movieNPObject;

}

static void initializeIdentifiers(void)

{

static bool identifiersInitialized;

if (identifiersInitialized)

return;

// Take all method identifier names and convert them to NPIdentifiers.

browser->getstringidentifiers(methodIdentifierNames, NUM_METHOD_IDENTIFIERS, methodIdentifiers);

identifiersInitialized = true;

}

static NPIdentifier methodIdentifiers[NUM_METHOD_IDENTIFIERS];

static const NPUTF8 *methodIdentifierNames[NUM_METHOD_IDENTIFIERS] = {

"play",

"pause",

};

使用的地方：

movieNPObjectHasMethod｛｝

movieNPObjectInvoke｛｝

转载于:https://www.cnblogs.com/Miami/p/3315509.html