2 * Dispatch API functions
4 * Copyright 2000 Francois Jacques, Macadamian Technologies Inc.
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 * TODO: Type coercion is implemented in variant.c but not called yet.
39 #include "winnls.h" /* for PRIMARYLANGID */
41 #include "wine/debug.h"
43 WINE_DEFAULT_DEBUG_CHANNEL(ole);
44 WINE_DECLARE_DEBUG_CHANNEL(typelib);
46 static IDispatch * WINAPI StdDispatch_Construct(IUnknown * punkOuter, void * pvThis, ITypeInfo * pTypeInfo);
48 /******************************************************************************
49 * DispInvoke (OLEAUT32.30)
51 * Call an object method using the information from its type library.
55 * Failure: Returns DISP_E_EXCEPTION and updates pexcepinfo if an exception occurs.
56 * DISP_E_BADPARAMCOUNT if the number of parameters is incorrect.
57 * DISP_E_MEMBERNOTFOUND if the method does not exist.
58 * puArgErr is updated if a parameter error (see notes) occurs.
59 * Otherwise, returns the result of calling ITypeInfo_Invoke().
62 * Parameter errors include the following:
64 *| E_INVALIDARG An argument was invalid
65 *| DISP_E_TYPEMISMATCH,
66 *| DISP_E_OVERFLOW An argument was valid but could not be coerced
67 *| DISP_E_PARAMNOTOPTIONAL A non optional parameter was not passed
68 *| DISP_E_PARAMNOTFOUND A parameter was passed that was not expected by the method
69 * This call defers to ITypeInfo_Invoke().
71 HRESULT WINAPI DispInvoke(
72 VOID *_this, /* [in] Object to call method on */
73 ITypeInfo *ptinfo, /* [in] Object type info */
74 DISPID dispidMember, /* [in] DISPID of the member (e.g. from GetIDsOfNames()) */
75 USHORT wFlags, /* [in] Kind of method call (DISPATCH_ flags from "oaidl.h") */
76 DISPPARAMS *pparams, /* [in] Array of method arguments */
77 VARIANT *pvarResult, /* [out] Destination for the result of the call */
78 EXCEPINFO *pexcepinfo, /* [out] Destination for exception information */
79 UINT *puArgErr) /* [out] Destination for bad argument */
83 * For each param, call DispGetParam to perform type coercion
85 FIXME("Coercion of arguments not implemented\n");
87 return ITypeInfo_Invoke(ptinfo, _this, dispidMember, wFlags,
88 pparams, pvarResult, pexcepinfo, puArgErr);
91 /******************************************************************************
92 * DispGetIDsOfNames (OLEAUT32.29)
94 * Convert a set of parameter names to DISPID's for DispInvoke().
98 * Failure: An HRESULT error code.
101 * This call defers to ITypeInfo_GetIDsOfNames(). The ITypeInfo interface passed
102 * as ptinfo contains the information to map names to DISPID's.
104 HRESULT WINAPI DispGetIDsOfNames(
105 ITypeInfo *ptinfo, /* [in] Object's type info */
106 OLECHAR **rgszNames, /* [in] Array of names to get DISPID's for */
107 UINT cNames, /* [in] Number of names in rgszNames */
108 DISPID *rgdispid) /* [out] Destination for converted DISPID's */
110 return ITypeInfo_GetIDsOfNames(ptinfo, rgszNames, cNames, rgdispid);
113 /******************************************************************************
114 * DispGetParam (OLEAUT32.28)
116 * Retrive a parameter from a DISPPARAMS structure and coerce it to the
117 * specified variant type.
120 * Coercion is done using system (0) locale.
124 * Failure: DISP_E_PARAMNOTFOUND, if position is invalid. or
125 * DISP_E_TYPEMISMATCH, if the coercion failed. puArgErr is
126 * set to the index of the argument in pdispparams.
128 HRESULT WINAPI DispGetParam(
129 DISPPARAMS *pdispparams, /* [in] Parameter list */
130 UINT position, /* [in] Position of parameter to coerce in pdispparams */
131 VARTYPE vtTarg, /* [in] Type of value to coerce to */
132 VARIANT *pvarResult, /* [out] Destination for resulting variant */
133 UINT *puArgErr) /* [out] Destination for error code */
135 /* position is counted backwards */
139 TRACE("position=%d, cArgs=%d, cNamedArgs=%d\n",
140 position, pdispparams->cArgs, pdispparams->cNamedArgs);
141 if (position < pdispparams->cArgs) {
142 /* positional arg? */
143 pos = pdispparams->cArgs - position - 1;
145 /* FIXME: is this how to handle named args? */
146 for (pos=0; pos<pdispparams->cNamedArgs; pos++)
147 if (pdispparams->rgdispidNamedArgs[pos] == position) break;
149 if (pos==pdispparams->cNamedArgs)
150 return DISP_E_PARAMNOTFOUND;
152 hr = VariantChangeType(pvarResult,
153 &pdispparams->rgvarg[pos],
155 if (hr == DISP_E_TYPEMISMATCH) *puArgErr = pos;
159 /******************************************************************************
160 * CreateStdDispatch [OLEAUT32.32]
162 * Create and return a standard IDispatch object.
165 * Success: S_OK. ppunkStdDisp contains the new object.
166 * Failure: An HRESULT error code.
169 * Outer unknown appears to be completely ignored.
171 HRESULT WINAPI CreateStdDispatch(
175 IUnknown** ppunkStdDisp)
177 TRACE("(%p, %p, %p, %p)\n", punkOuter, pvThis, ptinfo, ppunkStdDisp);
179 *ppunkStdDisp = (LPUNKNOWN)StdDispatch_Construct(punkOuter, pvThis, ptinfo);
181 return E_OUTOFMEMORY;
186 /******************************************************************************
187 * IDispatch {OLEAUT32}
190 * The IDispatch interface provides a single interface to dispatch method calls,
191 * regardless of whether the object to be called is in or out of process,
192 * local or remote (e.g. being called over a network). This interface is late-bound
193 * (linked at run-time), as opposed to early-bound (linked at compile time).
195 * The interface is used by objects that wish to called by scripting
196 * languages such as VBA, in order to minimise the amount of COM and C/C++
197 * knowledge required, or by objects that wish to live out of process from code
198 * that will call their methods.
200 * Method, property and parameter names can be localised. The details required to
201 * map names to methods and parameters are collected in a type library, usually
202 * output by an IDL compiler using the objects IDL description. This information is
203 * accessible programatically through the ITypeLib interface (for a type library),
204 * and the ITypeInfo interface (for an object within the type library). Type information
205 * can also be created at run-time using CreateDispTypeInfo().
208 * Instead of using IDispatch directly, there are several wrapper functions available
209 * to simplify the process of calling an objects methods through IDispatch.
211 * A standard implementation of an IDispatch object is created by calling
212 * CreateStdDispatch(). Numeric Id values for the parameters and methods (DISPID's)
213 * of an object of interest are retrieved by calling DispGetIDsOfNames(). DispGetParam()
214 * retrieves information about a particular parameter. Finally the DispInvoke()
215 * function is responsable for actually calling methods on an object.
222 IDispatchVtbl *lpVtbl;
224 ITypeInfo * pTypeInfo;
228 /******************************************************************************
229 * IDispatch_QueryInterface {OLEAUT32}
231 * See IUnknown_QueryInterface.
233 static HRESULT WINAPI StdDispatch_QueryInterface(
238 StdDispatch *This = (StdDispatch *)iface;
239 TRACE("(%p)->(%s, %p)\n", iface, debugstr_guid(riid), ppvObject);
241 if (IsEqualIID(riid, &IID_IDispatch) ||
242 IsEqualIID(riid, &IID_IUnknown))
244 *ppvObject = (LPVOID)This;
245 IUnknown_AddRef((LPUNKNOWN)*ppvObject);
248 return E_NOINTERFACE;
251 /******************************************************************************
252 * IDispatch_AddRef {OLEAUT32}
254 * See IUnknown_AddRef.
256 static ULONG WINAPI StdDispatch_AddRef(LPDISPATCH iface)
258 StdDispatch *This = (StdDispatch *)iface;
261 return InterlockedIncrement(&This->ref);
264 /******************************************************************************
265 * IDispatch_Release {OLEAUT32}
267 * See IUnknown_Release.
269 static ULONG WINAPI StdDispatch_Release(LPDISPATCH iface)
271 StdDispatch *This = (StdDispatch *)iface;
273 TRACE("(%p)->()\n", This);
275 ref = InterlockedDecrement(&This->ref);
279 ITypeInfo_Release(This->pTypeInfo);
286 /******************************************************************************
287 * IDispatch_GetTypeInfoCount {OLEAUT32}
289 * Get the count of type information in an IDispatch interface.
292 * iface [I] IDispatch interface
293 * pctinfo [O] Destination for the count
296 * Success: S_OK. pctinfo is updated with the count. This is always 1 if
297 * the object provides type information, and 0 if it does not.
298 * Failure: E_NOTIMPL. The object does not provide type information.
301 * See IDispatch() and IDispatch_GetTypeInfo().
303 static HRESULT WINAPI StdDispatch_GetTypeInfoCount(LPDISPATCH iface, UINT * pctinfo)
305 StdDispatch *This = (StdDispatch *)iface;
306 TRACE("(%p)\n", pctinfo);
308 *pctinfo = This->pTypeInfo ? 1 : 0;
312 /******************************************************************************
313 * IDispatch_GetTypeInfo {OLEAUT32}
315 * Get type information from an IDispatch interface.
318 * iface [I] IDispatch interface
319 * iTInfo [I] Index of type information.
320 * lcid [I] Locale of the type information to get
321 * ppTInfo [O] Destination for the ITypeInfo object
324 * Success: S_OK. ppTInfo is updated with the objects type information
325 * Failure: DISP_E_BADINDEX, if iTInfo is any value other than 0.
330 static HRESULT WINAPI StdDispatch_GetTypeInfo(LPDISPATCH iface, UINT iTInfo, LCID lcid, ITypeInfo** ppTInfo)
332 StdDispatch *This = (StdDispatch *)iface;
333 TRACE("(%d, %lx, %p)\n", iTInfo, lcid, ppTInfo);
337 return DISP_E_BADINDEX;
341 *ppTInfo = This->pTypeInfo;
342 ITypeInfo_AddRef(*ppTInfo);
347 /******************************************************************************
348 * IDispatch_GetIDsOfNames {OLEAUT32}
350 * Convert a methods name and an optional set of parameter names into DISPID's
351 * for passing to IDispatch_Invoke().
354 * iface [I] IDispatch interface
355 * riid [I] Reserved, set to IID_NULL
356 * rgszNames [I] Name to convert
357 * cNames [I] Number of names in rgszNames
358 * lcid [I] Locale of the type information to convert from
359 * rgDispId [O] Destination for converted DISPID's.
363 * Failure: DISP_E_UNKNOWNNAME, if any of the names is invalid.
364 * DISP_E_UNKNOWNLCID if lcid is invalid.
365 * Otherwise, an An HRESULT error code.
368 * This call defers to ITypeInfo_GetIDsOfNames(), using the ITypeInfo object
369 * contained within the IDispatch object.
370 * The first member of the names list must be a method name. The names following
371 * the method name are the parameters for that method.
373 static HRESULT WINAPI StdDispatch_GetIDsOfNames(LPDISPATCH iface, REFIID riid, LPOLESTR * rgszNames, UINT cNames, LCID lcid, DISPID * rgDispId)
375 StdDispatch *This = (StdDispatch *)iface;
376 TRACE("(%s, %p, %d, 0x%lx, %p)\n", debugstr_guid(riid), rgszNames, cNames, lcid, rgDispId);
378 if (!IsEqualGUID(riid, &IID_NULL))
380 FIXME(" expected riid == IID_NULL\n");
383 return DispGetIDsOfNames(This->pTypeInfo, rgszNames, cNames, rgDispId);
386 /******************************************************************************
387 * IDispatch_Invoke {OLEAUT32}
389 * Call an object method.
392 * iface [I] IDispatch interface
393 * dispIdMember [I] DISPID of the method (from GetIDsOfNames())
394 * riid [I] Reserved, set to IID_NULL
395 * lcid [I] Locale of the type information to convert parameters with
396 * wFlags, [I] Kind of method call (DISPATCH_ flags from "oaidl.h")
397 * pDispParams [I] Array of method arguments
398 * pVarResult [O] Destination for the result of the call
399 * pExcepInfo [O] Destination for exception information
400 * puArgErr [O] Destination for bad argument
404 * Failure: See DispInvoke() for failure cases.
407 * See DispInvoke() and IDispatch().
409 static HRESULT WINAPI StdDispatch_Invoke(LPDISPATCH iface, DISPID dispIdMember, REFIID riid, LCID lcid,
410 WORD wFlags, DISPPARAMS * pDispParams, VARIANT * pVarResult,
411 EXCEPINFO * pExcepInfo, UINT * puArgErr)
413 StdDispatch *This = (StdDispatch *)iface;
414 TRACE("(%ld, %s, 0x%lx, 0x%x, %p, %p, %p, %p)\n", dispIdMember, debugstr_guid(riid), lcid, wFlags, pDispParams, pVarResult, pExcepInfo, puArgErr);
416 if (!IsEqualGUID(riid, &IID_NULL))
418 FIXME(" expected riid == IID_NULL\n");
421 return DispInvoke(This->pvThis, This->pTypeInfo, dispIdMember, wFlags, pDispParams, pVarResult, pExcepInfo, puArgErr);
424 static IDispatchVtbl StdDispatch_VTable =
426 StdDispatch_QueryInterface,
429 StdDispatch_GetTypeInfoCount,
430 StdDispatch_GetTypeInfo,
431 StdDispatch_GetIDsOfNames,
435 static IDispatch * WINAPI StdDispatch_Construct(
436 IUnknown * punkOuter,
438 ITypeInfo * pTypeInfo)
440 StdDispatch * pStdDispatch;
442 pStdDispatch = CoTaskMemAlloc(sizeof(StdDispatch));
444 return (IDispatch *)pStdDispatch;
446 pStdDispatch->lpVtbl = &StdDispatch_VTable;
447 pStdDispatch->pvThis = pvThis;
448 pStdDispatch->pTypeInfo = pTypeInfo;
449 pStdDispatch->ref = 1;
451 /* we keep a reference to the type info so prevent it from
452 * being destroyed until we are done with it */
453 ITypeInfo_AddRef(pTypeInfo);
455 return (IDispatch *)pStdDispatch;