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94 lines
4.7 KiB
94 lines
4.7 KiB
Consider
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Abandon using IActiveScriptParse in favor of IPersist* (doesn't appear to be an options for VBS).
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Do we really need protection from multithreaded access? Am I doing it right?
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Am I defining/returning proper errors? What about the facility of errors from WinError.h that I return?
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In IDirectMusicScript, etc. pass variants by ref (pointer) instead of value for efficiency?
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If a null performance or loader is passed to IDirectMusicScript::Init then just create and initialize one.
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Should scripts be able to do all the initialization things traditionally done to prepare for playing?
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How do we handle CloseDown? Must be called by engine?
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Handle error hr's from calling DirectMusic objects better. Objects set rich error info that we save in exception?
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Multiply times by somthing like 1000 due to lost capacity. Similar to VB OM.
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Any way to turn off library functions such as Stop?
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Use properties. "MasterVolume = 100" instead of "SetMasterVolume(100)".
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Automation model
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We don't support type info.
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We don't support named parameters.
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We don't pass parameters by reference.
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International
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We have no support for scripts with international character sets or locale-dependant programming languages. In fact, we hard code English so that we assure consistent playback of scripts no matter whether they are running on English or on foreign-language OS's.
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The script source is read from disk with the ANSI code page.
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The script is interpreted/executed with respect to the US English locale.
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Scripting Engines
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The scripting engine must support the IActiveScriptParse interface.
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The scripting engine must change to the Started state immediately -- it cannot return OLESCRIPT_S_PENDING from SetScriptState.
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Restrictions for simplicity of script API / DirectMusicScript implementation
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Routines take no parameters and don't return values (use global variables instead)
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VBS
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No constant for OLESCRIPT_S_PENDING.
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IActiveScript::Close docs inconsistent about return if already closed.
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Script Event Track
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Mutes have no effect on whether script events fire.
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Implementing new IDispatch object
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New aut*.h from autperformance.h
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Replace CAutDirectMusicPerformance with CAutDirectMusic*
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Replace BaseImpPerf with BaseImp*
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Replace IDirectMusicPerformance with IDirectMusic*
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Replace automation methods (Delete GetIDs/Invoke overrides, delete or replace helpers)
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New aut*.cpp from autperformance.cpp
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#include "autperformance.h" -> "aut*.h", remove unnecessary includes
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Replace BaseImpPerf with BaseImp*
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Replace CAutDirectMusicPerformance with CAutDirectMusic*
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Change ms_wszClassName to the name of your object instead of "Performance"
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Replace method info
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Replace P in DMPDISP_* IDs with your own letter or couple of letters (DMLDISP_* for loader)
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Delete from private functions section onward
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Implement automation methods
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COM hookup
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define new guid in dmscriptautguids.h
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dll.cpp: #include "aut*.h", define g_szDMScript*FriendlyName etc
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dll.cpp: DllGetClassObject, DLLUnregisterServer, DLLRegisterServer
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Adding aggregated IDispatch to main objects
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place #include "dmscriptautguids.h" in initguid file and in object .cpp file
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Add IUnknown pointer for controlling unknown to object decl, init to NULL in constructor
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Add IID_IDispatch to query interface
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See an example such as performance.
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Be sure it returns NULL if it fails. (Change structure of if to clear *ppv at top and return E_NOTIMPL if still null instead of else.)
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Be sure to change performance type/GUID.
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Release on destruction, protect destruction with artificially increased ref count (read release and destruction code to make sure this works right with the object)
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Simple test
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Place breakpoint in a method and run into it
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Place breakpoint in real object's destructor and quit
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Step into release of Aut object to ensure it is destroyed as well
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Making a new track
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Add new CLSID to dmusici.h
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Create header from track.h
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Replace CDirectMusicScriptTrack
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Change EventInfo to contain the appropriate stuff
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Create source from track.cpp
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Replace CDirectMusicScriptTrack
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Eliminate or modify begin a tool and posting back to self
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IDirectMusicTool interface
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DMUS_PMSG_ScriptTrack structure
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Load ...
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Make new error to replace DMUS_E_INVALID_SCRIPTTRACK.
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InitPlay ...
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EndPlay ...
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Clone
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COM goo (ugh!)
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Duplicate class factory in dmprfdll.cpp and dmprfdll.h. Change new statement if necessary.
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#include track header in dmprfdll.cpp
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Add case to DllGetClassObject
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Add case to DllUnregisterServer and DllRegisterServer
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Segment trigger track
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SetParam (such as GUID_Download) with index 0 won't work. Only goes to band or trigger track
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but not both. Must use DMUS_SEG_ALLTRACKS with trigger track.
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