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OLE: Implement undocumented behaviour in DispCallFunc.

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Fix DispCallFunc to work with MSDN-undocumented behaviour used by
Office 2003 and document the function.
This commit is contained in:
Robert Shearman 2005-12-06 21:25:51 +01:00 committed by Alexandre Julliard
parent 1f68feeef1
commit a056a9a89c
1 changed files with 61 additions and 7 deletions
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68
dlls/oleaut32/typelib.c
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@ -5173,6 +5173,45 @@ static HRESULT typedescvt_to_variantvt(ITypeInfo *tinfo, TYPEDESC *tdesc, VARTYP
/***********************************************************************
* DispCallFunc (OLEAUT32.@)
*
* Invokes a function of the specifed calling convention, passing the
* specified arguments and returns the result.
*
* PARAMS
* pvInstance [I] Optional pointer to the instance whose function to invoke.
* oVft [I] The offset in the vtable. See notes.
* cc [I] Calling convention of the function to call.
* vtReturn [I] The return type of the function.
* cActuals [I] Number of parameters.
* prgvt [I] The types of the parameters to pass. This is used for sizing only.
* prgpvarg [I] The arguments to pass.
* pvargResult [O] The return value of the function. Can be NULL.
*
* RETURNS
* Success: S_OK.
* Failure: HRESULT code.
*
* NOTES
* The HRESULT return value of this function is not affected by the return
* value of the user supplied function, which is returned in pvargResult.
*
* If pvInstance is NULL then a non-object function is to be called and oVft
* is the address of the function to call.
*
* The cc parameter can be one of the following values:
*|CC_FASTCALL
*|CC_CDECL
*|CC_PASCAL
*|CC_STDCALL
*|CC_FPFASTCALL
*|CC_SYSCALL
*|CC_MPWCDECL
*|CC_MPWPASCAL
*
* BUGS
* Native accepts arguments in the reverse order. I.e. the first item in the
* prgpvarg array is the last argument in the C/C++ declaration of the
* function to be called.
*/
HRESULT WINAPI
DispCallFunc(
@ -5187,10 +5226,10 @@ DispCallFunc(
pvInstance, oVft, cc, vtReturn, cActuals, prgvt, prgpvarg,
pvargResult, V_VT(pvargResult));
/* DispCallFunc is only used to invoke methods belonging to an
* IDispatch-derived COM interface. So we need to add a first parameter
* to the list of arguments, to supply the interface pointer */
argsize = 1;
argsize = 0;
if (pvInstance)
argsize++; /* for This pointer */
for (i=0;i<cActuals;i++)
{
TRACE("arg %d: type %d, size %d\n",i,prgvt[i],_argsize(prgvt[i]));
@ -5198,8 +5237,14 @@ DispCallFunc(
argsize += _argsize(prgvt[i]);
}
args = HeapAlloc(GetProcessHeap(),0,sizeof(DWORD)*argsize);
args[0] = (DWORD)pvInstance; /* this is the fake IDispatch interface pointer */
argspos = 1;
argspos = 0;
if (pvInstance)
{
args[0] = (DWORD)pvInstance; /* the This pointer is always the first parameter */
argspos++;
}
for (i=0;i<cActuals;i++)
{
VARIANT *arg = prgpvarg[i];
@ -5208,7 +5253,16 @@ DispCallFunc(
argspos += _argsize(prgvt[i]);
}
hres = _invoke((*(FARPROC**)pvInstance)[oVft/sizeof(void *)],cc,argsize,args);
if (pvInstance)
{
FARPROC *vtable = *(FARPROC**)pvInstance;
hres = _invoke(vtable[oVft/sizeof(void *)], cc, argsize, args);
}
else
/* if we aren't invoking an object then the function pointer is stored
* in oVft */
hres = _invoke((FARPROC)oVft, cc, argsize, args);
if (pvargResult && (vtReturn != VT_EMPTY))
{
TRACE("Method returned 0x%08lx\n",hres);