dlls/oleaut32/dispatch.c

   1 /**
   2  * Dispatch API functions
   3  *
   4  * Copyright 2000  Francois Jacques, Macadamian Technologies Inc.
   5  *
   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.
  10  *
  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.
  15  *
  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
  19  *
  20  * TODO: Type coercion is implemented in variant.c but not called yet.
  21  */
  22
  23 #include "config.h"
  24
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <stdarg.h>
  28 #include <stdio.h>
  29 #include <ctype.h>
  30
  31 #include "windef.h"
  32 #include "winbase.h"
  33 #include "objbase.h"
  34 #include "oleauto.h"
  35 #include "winerror.h"
  36 #include "winreg.h"
  37 #include "winnls.h"         /* for PRIMARYLANGID */
  38
  39 #include "wine/debug.h"
  40
  41 WINE_DEFAULT_DEBUG_CHANNEL(ole);
  42 WINE_DECLARE_DEBUG_CHANNEL(typelib);
  43
  44 static IDispatch * WINAPI StdDispatch_Construct(IUnknown * punkOuter, void * pvThis, ITypeInfo * pTypeInfo);
  45
  46 /******************************************************************************
  47  *              DispInvoke (OLEAUT32.30)
  48  *
  49  * Call an object method using the information from its type library.
  50  *
  51  * RETURNS
  52  *  Success: S_OK.
  53  *  Failure: Returns DISP_E_EXCEPTION and updates pexcepinfo if an exception occurs.
  54  *           DISP_E_BADPARAMCOUNT if the number of parameters is incorrect.
  55  *           DISP_E_MEMBERNOTFOUND if the method does not exist.
  56  *           puArgErr is updated if a parameter error (see notes) occurs.
  57  *           Otherwise, returns the result of calling ITypeInfo_Invoke().
  58  *
  59  * NOTES
  60  *  Parameter errors include the following:
  61  *| DISP_E_BADVARTYPE
  62  *| E_INVALIDARG            An argument was invalid
  63  *| DISP_E_TYPEMISMATCH,
  64  *| DISP_E_OVERFLOW         An argument was valid but could not be coerced
  65  *| DISP_E_PARAMNOTOPTIONAL A non optional parameter was not passed
  66  *| DISP_E_PARAMNOTFOUND    A parameter was passed that was not expected by the method
  67  *  This call defers to ITypeInfo_Invoke().
  68  */
  69 HRESULT WINAPI DispInvoke(
  70         VOID       *_this,        /* [in] Object to call method on */
  71         ITypeInfo  *ptinfo,       /* [in] Object type info */
  72         DISPID      dispidMember, /* [in] DISPID of the member (e.g. from GetIDsOfNames()) */
  73         USHORT      wFlags,       /* [in] Kind of method call (DISPATCH_ flags from "oaidl.h") */
  74         DISPPARAMS *pparams,      /* [in] Array of method arguments */
  75         VARIANT    *pvarResult,   /* [out] Destination for the result of the call */
  76         EXCEPINFO  *pexcepinfo,   /* [out] Destination for exception information */
  77         UINT       *puArgErr)     /* [out] Destination for bad argument */
  78 {
  79     /**
  80      * TODO:
  81      * For each param, call DispGetParam to perform type coercion
  82      */
  83     FIXME("Coercion of arguments not implemented\n");
  84
  85     return ITypeInfo_Invoke(ptinfo, _this, dispidMember, wFlags,
  86                             pparams, pvarResult, pexcepinfo, puArgErr);
  87 }
  88
  89 /******************************************************************************
  90  *              DispGetIDsOfNames (OLEAUT32.29)
  91  *
  92  * Convert a set of parameter names to DISPID's for DispInvoke().
  93  *
  94  * RETURNS
  95  *  Success: S_OK.
  96  *  Failure: An HRESULT error code.
  97  *
  98  * NOTES
  99  *  This call defers to ITypeInfo_GetIDsOfNames(). The ITypeInfo interface passed
 100  *  as ptinfo contains the information to map names to DISPID's.
 101  */
 102 HRESULT WINAPI DispGetIDsOfNames(
 103         ITypeInfo  *ptinfo,    /* [in] Object's type info */
 104         OLECHAR   **rgszNames, /* [in] Array of names to get DISPID's for */
 105         UINT        cNames,    /* [in] Number of names in rgszNames */
 106         DISPID     *rgdispid)  /* [out] Destination for converted DISPID's */
 107 {
 108     return ITypeInfo_GetIDsOfNames(ptinfo, rgszNames, cNames, rgdispid);
 109 }
 110
 111 /******************************************************************************
 112  *              DispGetParam (OLEAUT32.28)
 113  *
 114  * Retrive a parameter from a DISPPARAMS structure and coerce it to the
 115  * specified variant type.
 116  *
 117  * NOTES
 118  *  Coercion is done using system (0) locale.
 119  *
 120  * RETURNS
 121  *  Success: S_OK.
 122  *  Failure: DISP_E_PARAMNOTFOUND, if position is invalid. or
 123  *           DISP_E_TYPEMISMATCH, if the coercion failed. puArgErr is
 124  *           set to the index of the argument in pdispparams.
 125  */
 126 HRESULT WINAPI DispGetParam(
 127         DISPPARAMS *pdispparams, /* [in] Parameter list */
 128         UINT        position,    /* [in] Position of parameter to coerce in pdispparams */
 129         VARTYPE     vtTarg,      /* [in] Type of value to coerce to */
 130         VARIANT    *pvarResult,  /* [out] Destination for resulting variant */
 131         UINT       *puArgErr)    /* [out] Destination for error code */
 132 {
 133     /* position is counted backwards */
 134     UINT pos;
 135     HRESULT hr;
 136
 137     TRACE("position=%d, cArgs=%d, cNamedArgs=%d\n",
 138           position, pdispparams->cArgs, pdispparams->cNamedArgs);
 139     if (position < pdispparams->cArgs) {
 140       /* positional arg? */
 141       pos = pdispparams->cArgs - position - 1;
 142     } else {
 143       /* FIXME: is this how to handle named args? */
 144       for (pos=0; pos<pdispparams->cNamedArgs; pos++)
 145         if (pdispparams->rgdispidNamedArgs[pos] == position) break;
 146
 147       if (pos==pdispparams->cNamedArgs)
 148         return DISP_E_PARAMNOTFOUND;
 149     }
 150     hr = VariantChangeType(pvarResult,
 151                            &pdispparams->rgvarg[pos],
 152                            0, vtTarg);
 153     if (hr == DISP_E_TYPEMISMATCH) *puArgErr = pos;
 154     return hr;
 155 }
 156
 157 /******************************************************************************
 158  * CreateStdDispatch [OLEAUT32.32]
 159  *
 160  * Create and return a standard IDispatch object.
 161  *
 162  * RETURNS
 163  *  Success: S_OK. ppunkStdDisp contains the new object.
 164  *  Failure: An HRESULT error code.
 165  *
 166  * NOTES
 167  *  Outer unknown appears to be completely ignored.
 168  */
 169 HRESULT WINAPI CreateStdDispatch(
 170         IUnknown* punkOuter,
 171         void* pvThis,
 172         ITypeInfo* ptinfo,
 173         IUnknown** ppunkStdDisp)
 174 {
 175     TRACE("(%p, %p, %p, %p)\n", punkOuter, pvThis, ptinfo, ppunkStdDisp);
 176
 177     *ppunkStdDisp = (LPUNKNOWN)StdDispatch_Construct(punkOuter, pvThis, ptinfo);
 178     if (!*ppunkStdDisp)
 179         return E_OUTOFMEMORY;
 180     return S_OK;
 181 }
 182
 183 /******************************************************************************
 184  * CreateDispTypeInfo [OLEAUT32.31]
 185  *
 186  * Build type information for an object so it can be called through an
 187  * IDispatch interface.
 188  *
 189  * RETURNS
 190  *  Success: S_OK. pptinfo contains the created ITypeInfo object.
 191  *  Failure: E_INVALIDARG, if one or more arguments is invalid.
 192  *
 193  * NOTES
 194  *  This call allows an objects methods to be accessed through IDispatch, by
 195  *  building an ITypeInfo object that IDispatch can use to call through.
 196  */
 197 HRESULT WINAPI CreateDispTypeInfo(
 198         INTERFACEDATA *pidata, /* [I] Description of the interface to build type info for */
 199         LCID lcid, /* [I] Locale Id */
 200         ITypeInfo **pptinfo) /* [O] Destination for created ITypeInfo object */
 201 {
 202         FIXME("(%p,%ld,%p),stub\n",pidata,lcid,pptinfo);
 203         return 0;
 204 }
 205
 206 /******************************************************************************
 207  * IDispatch {OLEAUT32}
 208  *
 209  * NOTES
 210  *  The IDispatch interface provides a single interface to dispatch method calls,
 211  *  regardless of whether the object to be called is in or out of process,
 212  *  local or remote (e.g. being called over a network). This interface is late-bound
 213  *  (linked at run-time), as opposed to early-bound (linked at compile time).
 214  *
 215  *  The interface is used by objects that wish to called by scripting
 216  *  languages such as VBA, in order to minimise the amount of COM and C/C++
 217  *  knowledge required, or by objects that wish to live out of process from code
 218  *  that will call their methods.
 219  *
 220  *  Method, property and parameter names can be localised. The details required to
 221  *  map names to methods and parameters are collected in a type library, usually
 222  *  output by an IDL compiler using the objects IDL description. This information is
 223  *  accessible programatically through the ITypeLib interface (for a type library),
 224  *  and the ITypeInfo interface (for an object within the type library). Type information
 225  *  can also be created at run-time using CreateDispTypeInfo().
 226  *
 227  * WRAPPERS
 228  *  Instead of using IDispatch directly, there are several wrapper functions available
 229  *  to simplify the process of calling an objects methods through IDispatch.
 230  *
 231  *  A standard implementation of an IDispatch object is created by calling
 232  *  CreateStdDispatch(). Numeric Id values for the parameters and methods (DISPID's)
 233  *  of an object of interest are retrieved by calling DispGetIDsOfNames(). DispGetParam()
 234  *  retrieves information about a particular parameter. Finally the DispInvoke()
 235  *  function is responsable for actually calling methods on an object.
 236  *
 237  * METHODS
 238  */
 239
 240 typedef struct
 241 {
 242     IDispatchVtbl *lpVtbl;
 243     void * pvThis;
 244     ITypeInfo * pTypeInfo;
 245     ULONG ref;
 246 } StdDispatch;
 247
 248 /******************************************************************************
 249  * IDispatch_QueryInterface {OLEAUT32}
 250  *
 251  * See IUnknown_QueryInterface.
 252  */
 253 static HRESULT WINAPI StdDispatch_QueryInterface(
 254   LPDISPATCH iface,
 255   REFIID riid,
 256   void** ppvObject)
 257 {
 258     ICOM_THIS(StdDispatch, iface);
 259     TRACE("(%p)->(%s, %p)\n", iface, debugstr_guid(riid), ppvObject);
 260
 261     if (IsEqualIID(riid, &IID_IDispatch) ||
 262         IsEqualIID(riid, &IID_IUnknown))
 263     {
 264         *ppvObject = (LPVOID)This;
 265         IUnknown_AddRef((LPUNKNOWN)*ppvObject);
 266         return S_OK;
 267     }
 268     return E_NOINTERFACE;
 269 }
 270
 271 /******************************************************************************
 272  * IDispatch_AddRef {OLEAUT32}
 273  *
 274  * See IUnknown_AddRef.
 275  */
 276 static ULONG WINAPI StdDispatch_AddRef(LPDISPATCH iface)
 277 {
 278     ICOM_THIS(StdDispatch, iface);
 279     TRACE("()\n");
 280
 281     return ++This->ref;
 282 }
 283
 284 /******************************************************************************
 285  * IDispatch_Release {OLEAUT32}
 286  *
 287  * See IUnknown_Release.
 288  */
 289 static ULONG WINAPI StdDispatch_Release(LPDISPATCH iface)
 290 {
 291     ICOM_THIS(StdDispatch, iface);
 292     ULONG ret;
 293     TRACE("(%p)->()\n", This);
 294
 295     ret = This->ref--;
 296
 297     if (This->ref == 0)
 298     {
 299         ITypeInfo_Release(This->pTypeInfo);
 300         CoTaskMemFree(This);
 301     }
 302
 303     return ret;
 304 }
 305
 306 /******************************************************************************
 307  * IDispatch_GetTypeInfoCount {OLEAUT32}
 308  *
 309  * Get the count of type information in an IDispatch interface.
 310  *
 311  * PARAMS
 312  *  iface   [I] IDispatch interface
 313  *  pctinfo [O] Destination for the count
 314  *
 315  * RETURNS
 316  *  Success: S_OK. pctinfo is updated with the count. This is always 1 if
 317  *           the object provides type information, and 0 if it does not.
 318  *  Failure: E_NOTIMPL. The object does not provide type information.
 319  *
 320  * NOTES
 321  *  See IDispatch() and IDispatch_GetTypeInfo().
 322  */
 323 static HRESULT WINAPI StdDispatch_GetTypeInfoCount(LPDISPATCH iface, UINT * pctinfo)
 324 {
 325     ICOM_THIS(StdDispatch, iface);
 326     TRACE("(%p)\n", pctinfo);
 327
 328     *pctinfo = This->pTypeInfo ? 1 : 0;
 329     return S_OK;
 330 }
 331
 332 /******************************************************************************
 333  * IDispatch_GetTypeInfo {OLEAUT32}
 334  *
 335  * Get type information from an IDispatch interface.
 336  *
 337  * PARAMS
 338  *  iface   [I] IDispatch interface
 339  *  iTInfo  [I] Index of type information.
 340  *  lcid    [I] Locale of the type information to get
 341  *  ppTInfo [O] Destination for the ITypeInfo object
 342  *
 343  * RETURNS
 344  *  Success: S_OK. ppTInfo is updated with the objects type information
 345  *  Failure: DISP_E_BADINDEX, if iTInfo is any value other than 0.
 346  *
 347  * NOTES
 348  *  See IDispatch.
 349  */
 350 static HRESULT WINAPI StdDispatch_GetTypeInfo(LPDISPATCH iface, UINT iTInfo, LCID lcid, ITypeInfo** ppTInfo)
 351 {
 352     ICOM_THIS(StdDispatch, iface);
 353     TRACE("(%d, %lx, %p)\n", iTInfo, lcid, ppTInfo);
 354
 355     *ppTInfo = NULL;
 356     if (iTInfo != 0)
 357         return DISP_E_BADINDEX;
 358
 359     if (This->pTypeInfo)
 360     {
 361       *ppTInfo = This->pTypeInfo;
 362       ITypeInfo_AddRef(*ppTInfo);
 363     }
 364     return S_OK;
 365 }
 366
 367 /******************************************************************************
 368  * IDispatch_GetIDsOfNames {OLEAUT32}
 369  *
 370  * Convert a methods name and an optional set of parameter names into DISPID's
 371  * for passing to IDispatch_Invoke().
 372  *
 373  * PARAMS
 374  *  iface     [I] IDispatch interface
 375  *  riid      [I] Reserved, set to IID_NULL
 376  *  rgszNames [I] Name to convert
 377  *  cNames    [I] Number of names in rgszNames
 378  *  lcid      [I] Locale of the type information to convert from
 379  *  rgDispId  [O] Destination for converted DISPID's.
 380  *
 381  * RETURNS
 382  *  Success: S_OK.
 383  *  Failure: DISP_E_UNKNOWNNAME, if any of the names is invalid.
 384  *           DISP_E_UNKNOWNLCID if lcid is invalid.
 385  *           Otherwise, an An HRESULT error code.
 386  *
 387  * NOTES
 388  *  This call defers to ITypeInfo_GetIDsOfNames(), using the ITypeInfo object
 389  *  contained within the IDispatch object.
 390  *  The first member of the names list must be a method name. The names following
 391  *  the method name are the parameters for that method.
 392  */
 393 static HRESULT WINAPI StdDispatch_GetIDsOfNames(LPDISPATCH iface, REFIID riid, LPOLESTR * rgszNames, UINT cNames, LCID lcid, DISPID * rgDispId)
 394 {
 395     ICOM_THIS(StdDispatch, iface);
 396     TRACE("(%s, %p, %d, 0x%lx, %p)\n", debugstr_guid(riid), rgszNames, cNames, lcid, rgDispId);
 397
 398     if (!IsEqualGUID(riid, &IID_NULL))
 399     {
 400         FIXME(" expected riid == IID_NULL\n");
 401         return E_INVALIDARG;
 402     }
 403     return DispGetIDsOfNames(This->pTypeInfo, rgszNames, cNames, rgDispId);
 404 }
 405
 406 /******************************************************************************
 407  * IDispatch_Invoke {OLEAUT32}
 408  *
 409  * Call an object method.
 410  *
 411  * PARAMS
 412  *  iface        [I] IDispatch interface
 413  *  dispIdMember [I] DISPID of the method (from GetIDsOfNames())
 414  *  riid         [I] Reserved, set to IID_NULL
 415  *  lcid         [I] Locale of the type information to convert parameters with
 416  *  wFlags,      [I] Kind of method call (DISPATCH_ flags from "oaidl.h")
 417  *  pDispParams  [I] Array of method arguments
 418  *  pVarResult   [O] Destination for the result of the call
 419  *  pExcepInfo   [O] Destination for exception information
 420  *  puArgErr     [O] Destination for bad argument
 421  *
 422  * RETURNS
 423  *  Success: S_OK.
 424  *  Failure: See DispInvoke() for failure cases.
 425  *
 426  * NOTES
 427  *  See DispInvoke() and IDispatch().
 428  */
 429 static HRESULT WINAPI StdDispatch_Invoke(LPDISPATCH iface, DISPID dispIdMember, REFIID riid, LCID lcid,
 430                                          WORD wFlags, DISPPARAMS * pDispParams, VARIANT * pVarResult,
 431                                          EXCEPINFO * pExcepInfo, UINT * puArgErr)
 432 {
 433     ICOM_THIS(StdDispatch, iface);
 434     TRACE("(%ld, %s, 0x%lx, 0x%x, %p, %p, %p, %p)\n", dispIdMember, debugstr_guid(riid), lcid, wFlags, pDispParams, pVarResult, pExcepInfo, puArgErr);
 435
 436     if (!IsEqualGUID(riid, &IID_NULL))
 437     {
 438         FIXME(" expected riid == IID_NULL\n");
 439         return E_INVALIDARG;
 440     }
 441     return DispInvoke(This->pvThis, This->pTypeInfo, dispIdMember, wFlags, pDispParams, pVarResult, pExcepInfo, puArgErr);
 442 }
 443
 444 static IDispatchVtbl StdDispatch_VTable =
 445 {
 446   StdDispatch_QueryInterface,
 447   StdDispatch_AddRef,
 448   StdDispatch_Release,
 449   StdDispatch_GetTypeInfoCount,
 450   StdDispatch_GetTypeInfo,
 451   StdDispatch_GetIDsOfNames,
 452   StdDispatch_Invoke
 453 };
 454
 455 static IDispatch * WINAPI StdDispatch_Construct(
 456   IUnknown * punkOuter,
 457   void * pvThis,
 458   ITypeInfo * pTypeInfo)
 459 {
 460     StdDispatch * pStdDispatch;
 461
 462     pStdDispatch = CoTaskMemAlloc(sizeof(StdDispatch));
 463     if (!pStdDispatch)
 464         return (IDispatch *)pStdDispatch;
 465
 466     pStdDispatch->lpVtbl = &StdDispatch_VTable;
 467     pStdDispatch->pvThis = pvThis;
 468     pStdDispatch->pTypeInfo = pTypeInfo;
 469     pStdDispatch->ref = 1;
 470
 471     /* we keep a reference to the type info so prevent it from
 472      * being destroyed until we are done with it */
 473     ITypeInfo_AddRef(pTypeInfo);
 474
 475     return (IDispatch *)pStdDispatch;
 476 }