129 lines
4 KiB
C++
129 lines
4 KiB
C++
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// Copyright (c) 1999 Microsoft Corporation. All rights reserved.
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//
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// Standard included stuff for the AudioVBScript engine.
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//
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#include "stdinc.h"
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#include "enginc.h"
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const char *g_rgszBuiltInConstants[] = { "true", "false", "nothing" };
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const int g_cBuiltInConstants = ARRAY_SIZE(g_rgszBuiltInConstants);
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DISPID
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GetDispID(IDispatch *pIDispatch, const char *pszBase)
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{
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SmartRef::WString wstrBase = pszBase;
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if (!wstrBase)
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return DISPID_UNKNOWN;
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DISPID dispid = DISPID_UNKNOWN;
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const WCHAR *wszBase = wstrBase;
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pIDispatch->GetIDsOfNames(IID_NULL, const_cast<WCHAR**>(&wszBase), 1, lcidUSEnglish, &dispid);
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return dispid;
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}
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// See oleaut.h for more info about why this is necessary.
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HRESULT
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InvokeAttemptingNotToUseOleAut(
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IDispatch *pDisp,
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DISPID dispIdMember,
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WORD wFlags,
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DISPPARAMS *pDispParams,
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VARIANT *pVarResult,
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EXCEPINFO *pExcepInfo,
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UINT *puArgErr)
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{
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if (g_fUseOleAut)
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{
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// Engine is set to always use oleaut32.dll.
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return pDisp->Invoke(dispIdMember, IID_NULL, lcidUSEnglish, wFlags, pDispParams, pVarResult, pExcepInfo, puArgErr);
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}
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// Try not to use oleaut32.dll.
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HRESULT hr = pDisp->Invoke(dispIdMember, g_guidInvokeWithoutOleaut, lcidUSEnglish, wFlags, pDispParams, pVarResult, pExcepInfo, puArgErr);
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if (hr != DISP_E_UNKNOWNINTERFACE)
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return hr;
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// It didn't like being called that way. Must be some other scripting language or non-DMusic dispatch interface.
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// Use regular oleaut32.dll calling convention.
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if (pVarResult)
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{
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// We need to convert the return into our own kind of variant.
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VARIANT var;
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DMS_VariantInit(true, &var);
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hr = pDisp->Invoke(dispIdMember, IID_NULL, lcidUSEnglish, wFlags, pDispParams, &var, pExcepInfo, puArgErr);
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DMS_VariantCopy(false, pVarResult, &var);
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DMS_VariantClear(true, &var);
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}
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else
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{
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// There's no result so no conversion is necessary.
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hr = pDisp->Invoke(dispIdMember, IID_NULL, lcidUSEnglish, wFlags, pDispParams, NULL, pExcepInfo, puArgErr);
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}
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// If an exception occurred, we need to convert the error strings into our own kind of BSTR.
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if (hr == DISP_E_EXCEPTION)
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ConvertOleAutExceptionBSTRs(true, false, pExcepInfo);
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return hr;
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}
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HRESULT
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SetDispatchProperty(IDispatch *pDisp, DISPID dispid, bool fSetRef, const VARIANT &v, EXCEPINFO *pExcepInfo)
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{
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DISPID dispidPropPut = DISPID_PROPERTYPUT;
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DISPPARAMS dispparams;
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dispparams.rgvarg = const_cast<VARIANT*>(&v);
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dispparams.rgdispidNamedArgs = &dispidPropPut;
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dispparams.cArgs = 1;
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dispparams.cNamedArgs = 1;
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HRESULT hr = InvokeAttemptingNotToUseOleAut(
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pDisp,
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dispid,
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fSetRef ? DISPATCH_PROPERTYPUTREF : DISPATCH_PROPERTYPUT,
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&dispparams,
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NULL,
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pExcepInfo,
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NULL);
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return hr;
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}
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HRESULT
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GetDispatchProperty(IDispatch *pDisp, DISPID dispid, VARIANT &v, EXCEPINFO *pExcepInfo)
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{
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DISPPARAMS dispparamsNoArgs = {NULL, NULL, 0, 0};
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HRESULT hr = InvokeAttemptingNotToUseOleAut(
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pDisp,
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dispid,
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DISPATCH_PROPERTYGET | DISPATCH_METHOD,
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// DISPATCH_METHOD is also set because in VB syntax a function with no parameters
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// can be accessed like a property. Example "x = GetMasterGrooveLevel" is a
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// shortcut for "x = GetMasterGrooveLevel()".
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&dispparamsNoArgs,
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&v,
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pExcepInfo,
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NULL);
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return hr;
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}
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// If needed, converts the BSTRs in an EXCEPINFO structure between formats using or not using OleAut.
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void ConvertOleAutExceptionBSTRs(bool fCurrentlyUsesOleAut, bool fResultUsesOleAut, EXCEPINFO *pExcepInfo)
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{
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if (pExcepInfo && fCurrentlyUsesOleAut != fResultUsesOleAut)
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{
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BSTR bstrSource = pExcepInfo->bstrSource;
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BSTR bstrDescription = pExcepInfo->bstrDescription;
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BSTR bstrHelpFile = pExcepInfo->bstrHelpFile;
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pExcepInfo->bstrSource = DMS_SysAllocString(fResultUsesOleAut, bstrSource);
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pExcepInfo->bstrDescription = DMS_SysAllocString(fResultUsesOleAut, bstrDescription);
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pExcepInfo->bstrHelpFile = DMS_SysAllocString(fResultUsesOleAut, bstrHelpFile);
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DMS_SysFreeString(fCurrentlyUsesOleAut, bstrSource);
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DMS_SysFreeString(fCurrentlyUsesOleAut, bstrDescription);
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DMS_SysFreeString(fCurrentlyUsesOleAut, bstrHelpFile);
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}
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}
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