dlls/mshtml/htmlform.c

   1 /*
   2  * Copyright 2009 Andrew Eikum for CodeWeavers
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  */
  18
  19 #include <stdarg.h>
  20
  21 #define COBJMACROS
  22
  23 #include "windef.h"
  24 #include "winbase.h"
  25 #include "winuser.h"
  26 #include "ole2.h"
  27
  28 #include "wine/debug.h"
  29
  30 #include "mshtml_private.h"
  31
  32 WINE_DEFAULT_DEBUG_CHANNEL(mshtml);
  33
  34 struct HTMLFormElement {
  35     HTMLElement element;
  36
  37     const IHTMLFormElementVtbl *lpHTMLFormElementVtbl;
  38
  39     nsIDOMHTMLFormElement *nsform;
  40 };
  41
  42 #define HTMLFORM(x)  (&(x)->lpHTMLFormElementVtbl)
  43
  44 static HRESULT htmlform_item(HTMLFormElement *This, int i, IDispatch **ret)
  45 {
  46     nsIDOMHTMLCollection *elements;
  47     nsIDOMNode *item;
  48     HTMLDOMNode *node;
  49     nsresult nsres;
  50
  51     nsres = nsIDOMHTMLFormElement_GetElements(This->nsform, &elements);
  52     if(NS_FAILED(nsres)) {
  53         FIXME("GetElements failed: 0x%08x\n", nsres);
  54         return E_FAIL;
  55     }
  56
  57     nsres = nsIDOMHTMLCollection_Item(elements, i, &item);
  58     nsIDOMHTMLCollection_Release(elements);
  59     if(NS_FAILED(nsres)) {
  60         FIXME("Item failed: 0x%08x\n", nsres);
  61         return E_FAIL;
  62     }
  63
  64     if(item) {
  65         node = get_node(This->element.node.doc, item, TRUE);
  66         if(!node)
  67             return E_OUTOFMEMORY;
  68
  69         IHTMLDOMNode_AddRef(HTMLDOMNODE(node));
  70         nsIDOMNode_Release(item);
  71         *ret = (IDispatch*)HTMLDOMNODE(node);
  72     }else {
  73         *ret = NULL;
  74     }
  75
  76     return S_OK;
  77 }
  78
  79 #define HTMLFORM_THIS(iface) DEFINE_THIS(HTMLFormElement, HTMLFormElement, iface)
  80
  81 static HRESULT WINAPI HTMLFormElement_QueryInterface(IHTMLFormElement *iface,
  82         REFIID riid, void **ppv)
  83 {
  84     HTMLFormElement *This = HTMLFORM_THIS(iface);
  85
  86     return IHTMLDOMNode_QueryInterface(HTMLDOMNODE(&This->element.node), riid, ppv);
  87 }
  88
  89 static ULONG WINAPI HTMLFormElement_AddRef(IHTMLFormElement *iface)
  90 {
  91     HTMLFormElement *This = HTMLFORM_THIS(iface);
  92
  93     return IHTMLDOMNode_AddRef(HTMLDOMNODE(&This->element.node));
  94 }
  95
  96 static ULONG WINAPI HTMLFormElement_Release(IHTMLFormElement *iface)
  97 {
  98     HTMLFormElement *This = HTMLFORM_THIS(iface);
  99
 100     return IHTMLDOMNode_Release(HTMLDOMNODE(&This->element.node));
 101 }
 102
 103 static HRESULT WINAPI HTMLFormElement_GetTypeInfoCount(IHTMLFormElement *iface, UINT *pctinfo)
 104 {
 105     HTMLFormElement *This = HTMLFORM_THIS(iface);
 106     return IDispatchEx_GetTypeInfoCount(DISPATCHEX(&This->element.node.dispex), pctinfo);
 107 }
 108
 109 static HRESULT WINAPI HTMLFormElement_GetTypeInfo(IHTMLFormElement *iface, UINT iTInfo,
 110                                               LCID lcid, ITypeInfo **ppTInfo)
 111 {
 112     HTMLFormElement *This = HTMLFORM_THIS(iface);
 113     return IDispatchEx_GetTypeInfo(DISPATCHEX(&This->element.node.dispex), iTInfo, lcid, ppTInfo);
 114 }
 115
 116 static HRESULT WINAPI HTMLFormElement_GetIDsOfNames(IHTMLFormElement *iface, REFIID riid,
 117                                                 LPOLESTR *rgszNames, UINT cNames,
 118                                                 LCID lcid, DISPID *rgDispId)
 119 {
 120     HTMLFormElement *This = HTMLFORM_THIS(iface);
 121     return IDispatchEx_GetIDsOfNames(DISPATCHEX(&This->element.node.dispex), riid, rgszNames, cNames, lcid, rgDispId);
 122 }
 123
 124 static HRESULT WINAPI HTMLFormElement_Invoke(IHTMLFormElement *iface, DISPID dispIdMember,
 125                             REFIID riid, LCID lcid, WORD wFlags, DISPPARAMS *pDispParams,
 126                             VARIANT *pVarResult, EXCEPINFO *pExcepInfo, UINT *puArgErr)
 127 {
 128     HTMLFormElement *This = HTMLFORM_THIS(iface);
 129     return IDispatchEx_Invoke(DISPATCHEX(&This->element.node.dispex), dispIdMember, riid, lcid, wFlags, pDispParams,
 130             pVarResult, pExcepInfo, puArgErr);
 131 }
 132
 133 static HRESULT WINAPI HTMLFormElement_put_action(IHTMLFormElement *iface, BSTR v)
 134 {
 135     HTMLFormElement *This = HTMLFORM_THIS(iface);
 136     nsAString action_str;
 137     nsresult nsres;
 138
 139     TRACE("(%p)->(%s)\n", This, wine_dbgstr_w(v));
 140
 141     nsAString_InitDepend(&action_str, v);
 142     nsres = nsIDOMHTMLFormElement_SetAction(This->nsform, &action_str);
 143     nsAString_Finish(&action_str);
 144     if(NS_FAILED(nsres)) {
 145         ERR("SetAction failed: %08x\n", nsres);
 146         return E_FAIL;
 147     }
 148
 149     return S_OK;
 150 }
 151
 152 static HRESULT WINAPI HTMLFormElement_get_action(IHTMLFormElement *iface, BSTR *p)
 153 {
 154     HTMLFormElement *This = HTMLFORM_THIS(iface);
 155     nsAString action_str;
 156     nsresult nsres;
 157     HRESULT hres;
 158
 159     TRACE("(%p)->(%p)\n", This, p);
 160
 161     nsAString_Init(&action_str, NULL);
 162     nsres = nsIDOMHTMLFormElement_GetAction(This->nsform, &action_str);
 163     if(NS_SUCCEEDED(nsres)) {
 164         const PRUnichar *action;
 165         nsAString_GetData(&action_str, &action);
 166         hres = nsuri_to_url(action, FALSE, p);
 167     }else {
 168         ERR("GetAction failed: %08x\n", nsres);
 169         hres = E_FAIL;
 170     }
 171
 172     return hres;
 173 }
 174
 175 static HRESULT WINAPI HTMLFormElement_put_dir(IHTMLFormElement *iface, BSTR v)
 176 {
 177     HTMLFormElement *This = HTMLFORM_THIS(iface);
 178     FIXME("(%p)->(%s)\n", This, wine_dbgstr_w(v));
 179     return E_NOTIMPL;
 180 }
 181
 182 static HRESULT WINAPI HTMLFormElement_get_dir(IHTMLFormElement *iface, BSTR *p)
 183 {
 184     HTMLFormElement *This = HTMLFORM_THIS(iface);
 185     FIXME("(%p)->(%p)\n", This, p);
 186     return E_NOTIMPL;
 187 }
 188
 189 static HRESULT WINAPI HTMLFormElement_put_encoding(IHTMLFormElement *iface, BSTR v)
 190 {
 191     HTMLFormElement *This = HTMLFORM_THIS(iface);
 192     FIXME("(%p)->(%s)\n", This, wine_dbgstr_w(v));
 193     return E_NOTIMPL;
 194 }
 195
 196 static HRESULT WINAPI HTMLFormElement_get_encoding(IHTMLFormElement *iface, BSTR *p)
 197 {
 198     HTMLFormElement *This = HTMLFORM_THIS(iface);
 199     FIXME("(%p)->(%p)\n", This, p);
 200     return E_NOTIMPL;
 201 }
 202
 203 static HRESULT WINAPI HTMLFormElement_put_method(IHTMLFormElement *iface, BSTR v)
 204 {
 205     HTMLFormElement *This = HTMLFORM_THIS(iface);
 206     FIXME("(%p)->(%s)\n", This, wine_dbgstr_w(v));
 207     return E_NOTIMPL;
 208 }
 209
 210 static HRESULT WINAPI HTMLFormElement_get_method(IHTMLFormElement *iface, BSTR *p)
 211 {
 212     HTMLFormElement *This = HTMLFORM_THIS(iface);
 213     FIXME("(%p)->(%p)\n", This, p);
 214     return E_NOTIMPL;
 215 }
 216
 217 static HRESULT WINAPI HTMLFormElement_get_elements(IHTMLFormElement *iface, IDispatch **p)
 218 {
 219     HTMLFormElement *This = HTMLFORM_THIS(iface);
 220     FIXME("(%p)->(%p)\n", This, p);
 221     return E_NOTIMPL;
 222 }
 223
 224 static HRESULT WINAPI HTMLFormElement_put_target(IHTMLFormElement *iface, BSTR v)
 225 {
 226     HTMLFormElement *This = HTMLFORM_THIS(iface);
 227     FIXME("(%p)->(%s)\n", This, wine_dbgstr_w(v));
 228     return E_NOTIMPL;
 229 }
 230
 231 static HRESULT WINAPI HTMLFormElement_get_target(IHTMLFormElement *iface, BSTR *p)
 232 {
 233     HTMLFormElement *This = HTMLFORM_THIS(iface);
 234     FIXME("(%p)->(%p)\n", This, p);
 235     return E_NOTIMPL;
 236 }
 237
 238 static HRESULT WINAPI HTMLFormElement_put_name(IHTMLFormElement *iface, BSTR v)
 239 {
 240     HTMLFormElement *This = HTMLFORM_THIS(iface);
 241     FIXME("(%p)->(%s)\n", This, wine_dbgstr_w(v));
 242     return E_NOTIMPL;
 243 }
 244
 245 static HRESULT WINAPI HTMLFormElement_get_name(IHTMLFormElement *iface, BSTR *p)
 246 {
 247     HTMLFormElement *This = HTMLFORM_THIS(iface);
 248     FIXME("(%p)->(%p)\n", This, p);
 249     return E_NOTIMPL;
 250 }
 251
 252 static HRESULT WINAPI HTMLFormElement_put_onsubmit(IHTMLFormElement *iface, VARIANT v)
 253 {
 254     HTMLFormElement *This = HTMLFORM_THIS(iface);
 255     FIXME("(%p)->(v)\n", This);
 256     return E_NOTIMPL;
 257 }
 258
 259 static HRESULT WINAPI HTMLFormElement_get_onsubmit(IHTMLFormElement *iface, VARIANT *p)
 260 {
 261     HTMLFormElement *This = HTMLFORM_THIS(iface);
 262     FIXME("(%p)->(%p)\n", This, p);
 263     return E_NOTIMPL;
 264 }
 265
 266 static HRESULT WINAPI HTMLFormElement_put_onreset(IHTMLFormElement *iface, VARIANT v)
 267 {
 268     HTMLFormElement *This = HTMLFORM_THIS(iface);
 269     FIXME("(%p)->(v)\n", This);
 270     return E_NOTIMPL;
 271 }
 272
 273 static HRESULT WINAPI HTMLFormElement_get_onreset(IHTMLFormElement *iface, VARIANT *p)
 274 {
 275     HTMLFormElement *This = HTMLFORM_THIS(iface);
 276     FIXME("(%p)->(%p)\n", This, p);
 277     return E_NOTIMPL;
 278 }
 279
 280 static HRESULT WINAPI HTMLFormElement_submit(IHTMLFormElement *iface)
 281 {
 282     HTMLFormElement *This = HTMLFORM_THIS(iface);
 283     FIXME("(%p)->()\n", This);
 284     return E_NOTIMPL;
 285 }
 286
 287 static HRESULT WINAPI HTMLFormElement_reset(IHTMLFormElement *iface)
 288 {
 289     HTMLFormElement *This = HTMLFORM_THIS(iface);
 290     FIXME("(%p)->()\n", This);
 291     return E_NOTIMPL;
 292 }
 293
 294 static HRESULT WINAPI HTMLFormElement_put_length(IHTMLFormElement *iface, LONG v)
 295 {
 296     HTMLFormElement *This = HTMLFORM_THIS(iface);
 297     FIXME("(%p)->(%d)\n", This, v);
 298     return E_NOTIMPL;
 299 }
 300
 301 static HRESULT WINAPI HTMLFormElement_get_length(IHTMLFormElement *iface, LONG *p)
 302 {
 303     HTMLFormElement *This = HTMLFORM_THIS(iface);
 304     PRInt32 length;
 305     nsresult nsres;
 306
 307     TRACE("(%p)->(%p)\n", This, p);
 308
 309     nsres = nsIDOMHTMLFormElement_GetLength(This->nsform, &length);
 310     if(NS_FAILED(nsres)) {
 311         ERR("GetLength failed: %08x\n", nsres);
 312         return E_FAIL;
 313     }
 314
 315     *p = length;
 316     return S_OK;
 317 }
 318
 319 static HRESULT WINAPI HTMLFormElement__newEnum(IHTMLFormElement *iface, IUnknown **p)
 320 {
 321     HTMLFormElement *This = HTMLFORM_THIS(iface);
 322     FIXME("(%p)->(%p)\n", This, p);
 323     return E_NOTIMPL;
 324 }
 325
 326 static HRESULT WINAPI HTMLFormElement_item(IHTMLFormElement *iface, VARIANT name,
 327         VARIANT index, IDispatch **pdisp)
 328 {
 329     HTMLFormElement *This = HTMLFORM_THIS(iface);
 330
 331     TRACE("(%p)->(%s %s %p)\n", This, debugstr_variant(&name), debugstr_variant(&index), pdisp);
 332
 333     if(!pdisp)
 334         return E_INVALIDARG;
 335     *pdisp = NULL;
 336
 337     if(V_VT(&name) == VT_I4) {
 338         if(V_I4(&name) < 0)
 339             return E_INVALIDARG;
 340         return htmlform_item(This, V_I4(&name), pdisp);
 341     }
 342
 343     FIXME("Unsupported args\n");
 344     return E_NOTIMPL;
 345 }
 346
 347 static HRESULT WINAPI HTMLFormElement_tags(IHTMLFormElement *iface, VARIANT tagName,
 348         IDispatch **pdisp)
 349 {
 350     HTMLFormElement *This = HTMLFORM_THIS(iface);
 351     FIXME("(%p)->(v %p)\n", This, pdisp);
 352     return E_NOTIMPL;
 353 }
 354
 355 #undef HTMLFORM_THIS
 356
 357 static const IHTMLFormElementVtbl HTMLFormElementVtbl = {
 358     HTMLFormElement_QueryInterface,
 359     HTMLFormElement_AddRef,
 360     HTMLFormElement_Release,
 361     HTMLFormElement_GetTypeInfoCount,
 362     HTMLFormElement_GetTypeInfo,
 363     HTMLFormElement_GetIDsOfNames,
 364     HTMLFormElement_Invoke,
 365     HTMLFormElement_put_action,
 366     HTMLFormElement_get_action,
 367     HTMLFormElement_put_dir,
 368     HTMLFormElement_get_dir,
 369     HTMLFormElement_put_encoding,
 370     HTMLFormElement_get_encoding,
 371     HTMLFormElement_put_method,
 372     HTMLFormElement_get_method,
 373     HTMLFormElement_get_elements,
 374     HTMLFormElement_put_target,
 375     HTMLFormElement_get_target,
 376     HTMLFormElement_put_name,
 377     HTMLFormElement_get_name,
 378     HTMLFormElement_put_onsubmit,
 379     HTMLFormElement_get_onsubmit,
 380     HTMLFormElement_put_onreset,
 381     HTMLFormElement_get_onreset,
 382     HTMLFormElement_submit,
 383     HTMLFormElement_reset,
 384     HTMLFormElement_put_length,
 385     HTMLFormElement_get_length,
 386     HTMLFormElement__newEnum,
 387     HTMLFormElement_item,
 388     HTMLFormElement_tags
 389 };
 390
 391 #define HTMLFORM_NODE_THIS(iface) DEFINE_THIS2(HTMLFormElement, element.node, iface)
 392
 393 static HRESULT HTMLFormElement_QI(HTMLDOMNode *iface, REFIID riid, void **ppv)
 394 {
 395     HTMLFormElement *This = HTMLFORM_NODE_THIS(iface);
 396
 397     *ppv = NULL;
 398
 399     if(IsEqualGUID(&IID_IUnknown, riid)) {
 400         TRACE("(%p)->(IID_IUnknown %p)\n", This, ppv);
 401         *ppv = HTMLFORM(This);
 402     }else if(IsEqualGUID(&IID_IDispatch, riid)) {
 403         TRACE("(%p)->(IID_IDispatch %p)\n", This, ppv);
 404         *ppv = HTMLFORM(This);
 405     }else if(IsEqualGUID(&IID_IHTMLFormElement, riid)) {
 406         TRACE("(%p)->(IID_IHTMLFormElement %p)\n", This, ppv);
 407         *ppv = HTMLFORM(This);
 408     }
 409
 410     if(*ppv) {
 411         IUnknown_AddRef((IUnknown*)*ppv);
 412         return S_OK;
 413     }
 414
 415     return HTMLElement_QI(&This->element.node, riid, ppv);
 416 }
 417
 418 static void HTMLFormElement_destructor(HTMLDOMNode *iface)
 419 {
 420     HTMLFormElement *This = HTMLFORM_NODE_THIS(iface);
 421
 422     if(This->nsform)
 423         nsIDOMHTMLFormElement_Release(This->nsform);
 424
 425     HTMLElement_destructor(&This->element.node);
 426 }
 427
 428 static HRESULT HTMLFormElement_get_dispid(HTMLDOMNode *iface,
 429         BSTR name, DWORD grfdex, DISPID *pid)
 430 {
 431     HTMLFormElement *This = HTMLFORM_NODE_THIS(iface);
 432     nsIDOMHTMLCollection *elements;
 433     nsAString nsname, nsstr;
 434     PRUint32 len, i;
 435     nsresult nsres;
 436     HRESULT hres = DISP_E_UNKNOWNNAME;
 437
 438     static const PRUnichar nameW[] = {'n','a','m','e',0};
 439
 440     TRACE("(%p)->(%s %x %p)\n", This, wine_dbgstr_w(name), grfdex, pid);
 441
 442     nsres = nsIDOMHTMLFormElement_GetElements(This->nsform, &elements);
 443     if(NS_FAILED(nsres)) {
 444         FIXME("GetElements failed: 0x%08x\n", nsres);
 445         return E_FAIL;
 446     }
 447
 448     nsres = nsIDOMHTMLCollection_GetLength(elements, &len);
 449     if(NS_FAILED(nsres)) {
 450         FIXME("GetLength failed: 0x%08x\n", nsres);
 451         nsIDOMHTMLCollection_Release(elements);
 452         return E_FAIL;
 453     }
 454
 455     nsAString_InitDepend(&nsname, nameW);
 456     nsAString_Init(&nsstr, NULL);
 457     for(i = 0; i < len; ++i) {
 458         nsIDOMNode *nsitem;
 459         nsIDOMHTMLElement *nshtml_elem;
 460         const PRUnichar *str;
 461
 462         nsres = nsIDOMHTMLCollection_Item(elements, i, &nsitem);
 463         if(NS_FAILED(nsres)) {
 464             FIXME("Item failed: 0x%08x\n", nsres);
 465             hres = E_FAIL;
 466             break;
 467         }
 468
 469         nsres = nsIDOMNode_QueryInterface(nsitem, &IID_nsIDOMHTMLElement, (void**)&nshtml_elem);
 470         nsIDOMNode_Release(nsitem);
 471         if(NS_FAILED(nsres)) {
 472             FIXME("Failed to get nsIDOMHTMLNode interface: 0x%08x\n", nsres);
 473             hres = E_FAIL;
 474             break;
 475         }
 476
 477         /* compare by id attr */
 478         nsres = nsIDOMHTMLElement_GetId(nshtml_elem, &nsstr);
 479         if(NS_FAILED(nsres)) {
 480             FIXME("GetId failed: 0x%08x\n", nsres);
 481             nsIDOMHTMLElement_Release(nshtml_elem);
 482             hres = E_FAIL;
 483             break;
 484         }
 485         nsAString_GetData(&nsstr, &str);
 486         if(!strcmpiW(str, name)) {
 487             nsIDOMHTMLElement_Release(nshtml_elem);
 488             /* FIXME: using index for dispid */
 489             *pid = MSHTML_DISPID_CUSTOM_MIN + i;
 490             hres = S_OK;
 491             break;
 492         }
 493
 494         /* compare by name attr */
 495         nsres = nsIDOMHTMLElement_GetAttribute(nshtml_elem, &nsname, &nsstr);
 496         nsIDOMHTMLElement_Release(nshtml_elem);
 497         nsAString_GetData(&nsstr, &str);
 498         if(!strcmpiW(str, name)) {
 499             /* FIXME: using index for dispid */
 500             *pid = MSHTML_DISPID_CUSTOM_MIN + i;
 501             hres = S_OK;
 502             break;
 503         }
 504     }
 505     nsAString_Finish(&nsname);
 506     nsAString_Finish(&nsstr);
 507
 508     nsIDOMHTMLCollection_Release(elements);
 509
 510     return hres;
 511 }
 512
 513 static HRESULT HTMLFormElement_invoke(HTMLDOMNode *iface,
 514         DISPID id, LCID lcid, WORD flags, DISPPARAMS *params, VARIANT *res,
 515         EXCEPINFO *ei, IServiceProvider *caller)
 516 {
 517     HTMLFormElement *This = HTMLFORM_NODE_THIS(iface);
 518     IDispatch *ret;
 519     HRESULT hres;
 520
 521     TRACE("(%p)->(%x %x %x %p %p %p %p)\n", This, id, lcid, flags, params, res, ei, caller);
 522
 523     hres = htmlform_item(This, id - MSHTML_DISPID_CUSTOM_MIN, &ret);
 524     if(FAILED(hres))
 525         return hres;
 526
 527     if(ret) {
 528         V_VT(res) = VT_DISPATCH;
 529         V_DISPATCH(res) = ret;
 530     }else {
 531         V_VT(res) = VT_NULL;
 532     }
 533     return S_OK;
 534 }
 535
 536 #undef HTMLFORM_NODE_THIS
 537
 538 static const NodeImplVtbl HTMLFormElementImplVtbl = {
 539     HTMLFormElement_QI,
 540     HTMLFormElement_destructor,
 541     NULL,
 542     NULL,
 543     NULL,
 544     NULL,
 545     NULL,
 546     NULL,
 547     HTMLFormElement_get_dispid,
 548     HTMLFormElement_invoke
 549 };
 550
 551 static const tid_t HTMLFormElement_iface_tids[] = {
 552     HTMLELEMENT_TIDS,
 553     IHTMLFormElement_tid,
 554     0
 555 };
 556
 557 static dispex_static_data_t HTMLFormElement_dispex = {
 558     NULL,
 559     DispHTMLFormElement_tid,
 560     NULL,
 561     HTMLFormElement_iface_tids
 562 };
 563
 564 HTMLElement *HTMLFormElement_Create(HTMLDocumentNode *doc, nsIDOMHTMLElement *nselem)
 565 {
 566     HTMLFormElement *ret = heap_alloc_zero(sizeof(HTMLFormElement));
 567     nsresult nsres;
 568
 569     ret->lpHTMLFormElementVtbl = &HTMLFormElementVtbl;
 570     ret->element.node.vtbl = &HTMLFormElementImplVtbl;
 571
 572     HTMLElement_Init(&ret->element, doc, nselem, &HTMLFormElement_dispex);
 573
 574     nsres = nsIDOMHTMLElement_QueryInterface(nselem, &IID_nsIDOMHTMLFormElement, (void**)&ret->nsform);
 575     if(NS_FAILED(nsres))
 576         ERR("Could not get nsIDOMHTMLFormElement interface: %08x\n", nsres);
 577
 578     return &ret->element;
 579 }