Loading Character and Animation Data

Once you have a pointer to the IAgentEx interface, you can use the Load method to load a character and retrieve its IAgentCharacterEx interface. There are three different possibilities for the Load path of a character. The first is compatible with Microsoft Agent 1.5 where the specified path is the full path and filename of a character file. The second possibility is to specify the filename only, in which case, Agent looks in its Chars directory. The last possibility is to supply an empty Variant parameter that causes the default character to be loaded.

   // Create a variant to store the filename of the character to load

const LPWSTR kpwszCharacter = L"merlin.acs";

   VariantInit(&vPath);

   vPath.vt = VT_BSTR;
   vPath.bstrVal = SysAllocString(kpwszCharacter);

   // Load the character

   hRes = pAgentEx->Load(vPath, &lCharID, &lRequestID);

   // Get its IAgentCharacterEx interface

   hRes = pAgentEx->GetCharacterEx(lCharID, &pCharacterEx);

You can use this interface to access the character's methods:

   // Show the character.  The first parameter tells Microsoft
   // Agent to show the character by playing an animation.

   hRes = pCharacterEx->Show(FALSE, &lRequestID);

   // Make the character speak

   bszSpeak = SysAllocString(L"Hello World!");

   hRes = pCharacterEx->Speak(bszSpeak, NULL, &lRequestID);

   SysFreeString(bszSpeak);

When you no longer need Microsoft Agent services, such as when your client application shuts down, release its interfaces. Note that releasing the character interface does not unload the character. Call the Unload method to do this before releasing the IAgentEx interface:

// Clean up

if (pCharacterEx) {

   // Release the character interface

   pCharacterEx->Release();

   // Unload the character.  NOTE:  releasing the character
   // interface does NOT make the character go away.  You must
   // call Unload.

   pAgentEx->Unload(lCharID);
}
   
// Release the Agent

pAgentEx->Release();

VariantClear(&vPath);