IDispatch::GetIDsOfNames每次只能获得COM组件的1个方法名的DISPID？

如题，我写了一个控制台程序，试图通过调用IDispatch::GetIDsOfNames一次性获得ShockwaveFlash组件的多个方法的DISPID，但是调用失败了，返回值是0x80020006，意思是“未知名称”。我的代码如下：

#include <shlobj.h>

#include <shobjidl.h>

#include <iostream>

#include <iomanip>

#include <string>

#include <combaseapi.h>

#include <windows.h>



using namespace std;



void studyGetMultiIdsForNames()

{

   CLSID const clsid = { 0xD27CDB6E, 0xAE6D, 0x11CF, {0x96, 0xB8, 0x44, 0x45, 0x53, 0x54, 0x0, 0x0} };



   IUnknown *object = nullptr;

   HRESULT hr = CoCreateInstance(clsid, nullptr, CLSCTX_INPROC_SERVER, IID_IUnknown, reinterpret_cast<void **>(&object));

   cout << "CoCreateInstance(): " << dec << hr << endl;

   cout << "IUnknown *object = " << object << endl;



   IDispatch *disp = nullptr;

   hr = object->QueryInterface(IID_IDispatch, (void **)(&disp));

   cout << "object->QueryInterface(): " << dec << hr << endl;

   cout << "IDispatch *disp = " <<disp << endl;



   const size_t nameCount = 4;// sizeof methodNames / sizeof methodNames[0];

   BSTR methodNames[nameCount] = { (BSTR)(L"LoadMovie"), (BSTR)(L"FlashVersion"), (BSTR)(L"Play"), (BSTR)(L"Stop") };

   DISPID dispIds[nameCount] = { 0 };

   hr = disp->GetIDsOfNames(IID_NULL, methodNames, nameCount, LOCALE_SYSTEM_DEFAULT, dispIds);

   cout << "disp->GetIDsOfNames(, , 4, ): " << hex << showbase << hr << endl;

   for (size_t index = 0; index < nameCount; index++)

   {

      wcout << dispIds[index] << " : " << methodNames[index] << endl;

   }



   disp->Release();

   object->Release();

}



int main()

{

   CoInitializeEx(nullptr, COINIT_MULTITHREADED);



   studyGetMultiIdsForNames();



   CoUninitialize();

}

运行结果如下：

CoCreateInstance(): 0

IUnknown *object = 0x8d9180

object->QueryInterface(): 0

IDispatch *disp = 0x8ca248

disp->GetIDsOfNames(, , 4, ): 0x80020006

142 : LoadMovie

-1 : FlashVersion

-1 : Play

-1 : Stop

这段代码中，第28行disp->GetIDsOfNames调用后返回0x80020006，只有methodNames数组中的第一个方法名得到了DISPID，其他的三个的DISPIP都只是-1。难道IDispatch::GetIDsOfNames每次只能获得COM组件的1个方法名的DISPID？请各位大神解答。谢谢！