NPAPI Plugin: Example

http://groups.google.com/group/chromium-extensions/files/

npsimple-11-04-2009.tar.gz

NP_Initialize(), NP_Shutdown() will load/unload plugin.
Browser further get NPPluginFucs to call.

typedef struct _NPPluginFuncs {
uint16_t size;
uint16_t version;
NPP_NewProcPtr newp;
NPP_DestroyProcPtr destroy;
NPP_SetWindowProcPtr setwindow;
NPP_NewStreamProcPtr newstream;
NPP_DestroyStreamProcPtr destroystream;
NPP_StreamAsFileProcPtr asfile;
NPP_WriteReadyProcPtr writeready;
NPP_WriteProcPtr write;
NPP_PrintProcPtr print;
NPP_HandleEventProcPtr event;
NPP_URLNotifyProcPtr urlnotify;
void* javaClass;
NPP_GetValueProcPtr getvalue;
NPP_SetValueProcPtr setvalue;
} NPPluginFuncs;

newp(), destroy() is to create and destroy an instance.

If the plugin is scriptable, browser use getvalue() to get the NPClass...

struct NPClass
{
uint32_t structVersion;
NPAllocateFunctionPtr allocate;
NPDeallocateFunctionPtr deallocate;
NPInvalidateFunctionPtr invalidate;
NPHasMethodFunctionPtr hasMethod;
NPInvokeFunctionPtr invoke;
NPInvokeDefaultFunctionPtr invokeDefault;
NPHasPropertyFunctionPtr hasProperty;
NPGetPropertyFunctionPtr getProperty;
NPSetPropertyFunctionPtr setProperty;
NPRemovePropertyFunctionPtr removeProperty;
NPEnumerationFunctionPtr enumerate;
NPConstructFunctionPtr construct;
};

When object in html call the method, browser will use invoke() to do corresponding function...