dlls/comctl32/ipaddress.c

   1 /*
   2  * IP Address control
   3  *
   4  * Copyright 2002 Dimitrie O. Paun
   5  * Copyright 1999 Chris Morgan<cmorgan@wpi.edu>
   6  * Copyright 1999 James Abbatiello<abbeyj@wpi.edu>
   7  * Copyright 1998, 1999 Eric Kohl
   8  * Copyright 1998 Alex Priem <alexp@sci.kun.nl>
   9  *
  10  * This library is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU Lesser General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2.1 of the License, or (at your option) any later version.
  14  *
  15  * This library is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public
  21  * License along with this library; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  23  *
  24  * NOTE
  25  *
  26  * This code was audited for completeness against the documented features
  27  * of Comctl32.dll version 6.0 on Sep. 9, 2002, by Dimitrie O. Paun.
  28  *
  29  * Unless otherwise noted, we believe this code to be complete, as per
  30  * the specification mentioned above.
  31  * If you discover missing features, or bugs, please note them below.
  32  *
  33  */
  34
  35 #include <ctype.h>
  36 #include <stdlib.h>
  37 #include <stdarg.h>
  38 #include <stdio.h>
  39 #include <string.h>
  40
  41 #include "windef.h"
  42 #include "winbase.h"
  43 #include "wingdi.h"
  44 #include "winuser.h"
  45 #include "winnls.h"
  46 #include "commctrl.h"
  47 #include "comctl32.h"
  48 #include "wine/unicode.h"
  49 #include "wine/debug.h"
  50
  51 WINE_DEFAULT_DEBUG_CHANNEL(ipaddress);
  52
  53 typedef struct
  54 {
  55     HWND     EditHwnd;
  56     INT      LowerLimit;
  57     INT      UpperLimit;
  58     WNDPROC  OrigProc;
  59 } IPPART_INFO;
  60
  61 typedef struct
  62 {
  63     HWND        Self;
  64     HWND        Notify;
  65     BOOL        Enabled;
  66     IPPART_INFO Part[4];
  67 } IPADDRESS_INFO;
  68
  69 static const WCHAR IP_SUBCLASS_PROP[] =
  70     { 'C', 'C', 'I', 'P', '3', '2', 'S', 'u', 'b', 'c', 'l', 'a', 's', 's', 'I', 'n', 'f', 'o', 0 };
  71
  72 #define POS_DEFAULT     0
  73 #define POS_LEFT        1
  74 #define POS_RIGHT       2
  75 #define POS_SELALL      3
  76
  77 static LRESULT CALLBACK
  78 IPADDRESS_SubclassProc (HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
  79
  80 static LRESULT IPADDRESS_Notify (const IPADDRESS_INFO *infoPtr, UINT command)
  81 {
  82     HWND hwnd = infoPtr->Self;
  83
  84     TRACE("(command=%x)\n", command);
  85
  86     return SendMessageW (infoPtr->Notify, WM_COMMAND,
  87              MAKEWPARAM (GetWindowLongPtrW (hwnd, GWLP_ID), command), (LPARAM)hwnd);
  88 }
  89
  90 static INT IPADDRESS_IPNotify (const IPADDRESS_INFO *infoPtr, INT field, INT value)
  91 {
  92     NMIPADDRESS nmip;
  93
  94     TRACE("(field=%x, value=%d)\n", field, value);
  95
  96     nmip.hdr.hwndFrom = infoPtr->Self;
  97     nmip.hdr.idFrom   = GetWindowLongPtrW (infoPtr->Self, GWLP_ID);
  98     nmip.hdr.code     = IPN_FIELDCHANGED;
  99
 100     nmip.iField = field;
 101     nmip.iValue = value;
 102
 103     SendMessageW (infoPtr->Notify, WM_NOTIFY, nmip.hdr.idFrom, (LPARAM)&nmip);
 104
 105     TRACE("<-- %d\n", nmip.iValue);
 106
 107     return nmip.iValue;
 108 }
 109
 110
 111 static int IPADDRESS_GetPartIndex(const IPADDRESS_INFO *infoPtr, HWND hwnd)
 112 {
 113     int i;
 114
 115     TRACE("(hwnd=%p)\n", hwnd);
 116
 117     for (i = 0; i < 4; i++)
 118         if (infoPtr->Part[i].EditHwnd == hwnd) return i;
 119
 120     ERR("We subclassed the wrong window! (hwnd=%p)\n", hwnd);
 121     return -1;
 122 }
 123
 124
 125 static LRESULT IPADDRESS_Draw (const IPADDRESS_INFO *infoPtr, HDC hdc)
 126 {
 127     static const WCHAR dotW[] = { '.', 0 };
 128     RECT rect, rcPart;
 129     POINT pt;
 130     COLORREF bgCol, fgCol;
 131     int i;
 132
 133     TRACE("\n");
 134
 135     GetClientRect (infoPtr->Self, &rect);
 136
 137     if (infoPtr->Enabled) {
 138         bgCol = COLOR_WINDOW;
 139         fgCol = COLOR_WINDOWTEXT;
 140     } else {
 141         bgCol = COLOR_3DFACE;
 142         fgCol = COLOR_GRAYTEXT;
 143     }
 144
 145     FillRect (hdc, &rect, (HBRUSH)(DWORD_PTR)(bgCol+1));
 146     DrawEdge (hdc, &rect, EDGE_SUNKEN, BF_RECT | BF_ADJUST);
 147
 148     SetBkColor  (hdc, GetSysColor(bgCol));
 149     SetTextColor(hdc, GetSysColor(fgCol));
 150
 151     for (i = 0; i < 3; i++) {
 152         GetWindowRect (infoPtr->Part[i].EditHwnd, &rcPart);
 153         pt.x = rcPart.right;
 154         ScreenToClient(infoPtr->Self, &pt);
 155         rect.left = pt.x;
 156         GetWindowRect (infoPtr->Part[i+1].EditHwnd, &rcPart);
 157         pt.x = rcPart.left;
 158         ScreenToClient(infoPtr->Self, &pt);
 159         rect.right = pt.x;
 160         DrawTextW(hdc, dotW, 1, &rect, DT_SINGLELINE | DT_CENTER | DT_BOTTOM);
 161     }
 162
 163     return 0;
 164 }
 165
 166
 167 static LRESULT IPADDRESS_Create (HWND hwnd, const CREATESTRUCTA *lpCreate)
 168 {
 169     static const WCHAR EDIT[] = { 'E', 'd', 'i', 't', 0 };
 170     IPADDRESS_INFO *infoPtr;
 171     RECT rcClient, edit;
 172     int i, fieldsize;
 173     HFONT hFont, hSysFont;
 174     LOGFONTW logFont, logSysFont;
 175
 176     TRACE("\n");
 177
 178     SetWindowLongW (hwnd, GWL_STYLE,
 179                     GetWindowLongW(hwnd, GWL_STYLE) & ~WS_BORDER);
 180
 181     infoPtr = (IPADDRESS_INFO *)Alloc (sizeof(IPADDRESS_INFO));
 182     if (!infoPtr) return -1;
 183     SetWindowLongPtrW (hwnd, 0, (DWORD_PTR)infoPtr);
 184
 185     GetClientRect (hwnd, &rcClient);
 186
 187     fieldsize = (rcClient.right - rcClient.left) / 4;
 188
 189     edit.top    = rcClient.top + 2;
 190     edit.bottom = rcClient.bottom - 2;
 191
 192     infoPtr->Self = hwnd;
 193     infoPtr->Enabled = TRUE;
 194     infoPtr->Notify = lpCreate->hwndParent;
 195
 196     hSysFont = (HFONT) GetStockObject(ANSI_VAR_FONT);
 197     GetObjectW(hSysFont, sizeof(LOGFONTW), &logSysFont);
 198     SystemParametersInfoW(SPI_GETICONTITLELOGFONT, 0, &logFont, 0);
 199     strcpyW(logFont.lfFaceName, logSysFont.lfFaceName);
 200     hFont = CreateFontIndirectW(&logFont);
 201
 202     for (i = 0; i < 4; i++) {
 203         IPPART_INFO* part = &infoPtr->Part[i];
 204
 205         part->LowerLimit = 0;
 206         part->UpperLimit = 255;
 207         edit.left = rcClient.left + i*fieldsize + 6;
 208         edit.right = rcClient.left + (i+1)*fieldsize - 2;
 209         part->EditHwnd =
 210                 CreateWindowW (EDIT, NULL, WS_CHILD | WS_VISIBLE | ES_CENTER,
 211                                edit.left, edit.top, edit.right - edit.left,
 212                                edit.bottom - edit.top, hwnd, (HMENU) 1,
 213                                (HINSTANCE)GetWindowLongPtrW(hwnd, GWLP_HINSTANCE), NULL);
 214         SendMessageW(part->EditHwnd, WM_SETFONT, (WPARAM) hFont, FALSE);
 215         SetPropW(part->EditHwnd, IP_SUBCLASS_PROP, hwnd);
 216         part->OrigProc = (WNDPROC)
 217                 SetWindowLongPtrW (part->EditHwnd, GWLP_WNDPROC,
 218                                 (DWORD_PTR)IPADDRESS_SubclassProc);
 219         EnableWindow(part->EditHwnd, infoPtr->Enabled);
 220     }
 221
 222     return 0;
 223 }
 224
 225
 226 static LRESULT IPADDRESS_Destroy (IPADDRESS_INFO *infoPtr)
 227 {
 228     int i;
 229
 230     TRACE("\n");
 231
 232     for (i = 0; i < 4; i++) {
 233         IPPART_INFO* part = &infoPtr->Part[i];
 234         SetWindowLongPtrW (part->EditHwnd, GWLP_WNDPROC, (DWORD_PTR)part->OrigProc);
 235     }
 236
 237     SetWindowLongPtrW (infoPtr->Self, 0, 0);
 238     Free (infoPtr);
 239     return 0;
 240 }
 241
 242
 243 static LRESULT IPADDRESS_Enable (IPADDRESS_INFO *infoPtr, BOOL enabled)
 244 {
 245     int i;
 246
 247     infoPtr->Enabled = enabled;
 248
 249     for (i = 0; i < 4; i++)
 250         EnableWindow(infoPtr->Part[i].EditHwnd, enabled);
 251
 252     InvalidateRgn(infoPtr->Self, NULL, FALSE);
 253     return 0;
 254 }
 255
 256
 257 static LRESULT IPADDRESS_Paint (const IPADDRESS_INFO *infoPtr, HDC hdc)
 258 {
 259     PAINTSTRUCT ps;
 260
 261     TRACE("\n");
 262
 263     if (hdc) return IPADDRESS_Draw (infoPtr, hdc);
 264
 265     hdc = BeginPaint (infoPtr->Self, &ps);
 266     IPADDRESS_Draw (infoPtr, hdc);
 267     EndPaint (infoPtr->Self, &ps);
 268     return 0;
 269 }
 270
 271
 272 static BOOL IPADDRESS_IsBlank (const IPADDRESS_INFO *infoPtr)
 273 {
 274     int i;
 275
 276     TRACE("\n");
 277
 278     for (i = 0; i < 4; i++)
 279         if (GetWindowTextLengthW (infoPtr->Part[i].EditHwnd)) return FALSE;
 280
 281     return TRUE;
 282 }
 283
 284
 285 static int IPADDRESS_GetAddress (const IPADDRESS_INFO *infoPtr, LPDWORD ip_address)
 286 {
 287     WCHAR field[5];
 288     int i, invalid = 0;
 289     DWORD ip_addr = 0;
 290
 291     TRACE("\n");
 292
 293     for (i = 0; i < 4; i++) {
 294         ip_addr *= 256;
 295         if (GetWindowTextW (infoPtr->Part[i].EditHwnd, field, 4))
 296             ip_addr += atolW(field);
 297         else
 298             invalid++;
 299     }
 300     *ip_address = ip_addr;
 301
 302     return 4 - invalid;
 303 }
 304
 305
 306 static BOOL IPADDRESS_SetRange (IPADDRESS_INFO *infoPtr, int index, WORD range)
 307 {
 308     TRACE("\n");
 309
 310     if ( (index < 0) || (index > 3) ) return FALSE;
 311
 312     infoPtr->Part[index].LowerLimit = range & 0xFF;
 313     infoPtr->Part[index].UpperLimit = (range >> 8)  & 0xFF;
 314
 315     return TRUE;
 316 }
 317
 318
 319 static void IPADDRESS_ClearAddress (const IPADDRESS_INFO *infoPtr)
 320 {
 321     WCHAR nil[1] = { 0 };
 322     int i;
 323
 324     TRACE("\n");
 325
 326     for (i = 0; i < 4; i++)
 327         SetWindowTextW (infoPtr->Part[i].EditHwnd, nil);
 328 }
 329
 330
 331 static LRESULT IPADDRESS_SetAddress (const IPADDRESS_INFO *infoPtr, DWORD ip_address)
 332 {
 333     WCHAR buf[20];
 334     static const WCHAR fmt[] = { '%', 'd', 0 };
 335     int i;
 336
 337     TRACE("\n");
 338
 339     for (i = 3; i >= 0; i--) {
 340         const IPPART_INFO* part = &infoPtr->Part[i];
 341         int value = ip_address & 0xff;
 342         if ( (value >= part->LowerLimit) && (value <= part->UpperLimit) ) {
 343             wsprintfW (buf, fmt, value);
 344             SetWindowTextW (part->EditHwnd, buf);
 345             IPADDRESS_Notify (infoPtr, EN_CHANGE);
 346         }
 347         ip_address >>= 8;
 348     }
 349
 350     return TRUE;
 351 }
 352
 353
 354 static void IPADDRESS_SetFocusToField (const IPADDRESS_INFO *infoPtr, INT index)
 355 {
 356     TRACE("(index=%d)\n", index);
 357
 358     if (index > 3 || index < 0) index=0;
 359
 360     SetFocus (infoPtr->Part[index].EditHwnd);
 361 }
 362
 363
 364 static BOOL IPADDRESS_ConstrainField (const IPADDRESS_INFO *infoPtr, int currentfield)
 365 {
 366     const IPPART_INFO *part = &infoPtr->Part[currentfield];
 367     WCHAR field[10];
 368     static const WCHAR fmt[] = { '%', 'd', 0 };
 369     int curValue, newValue;
 370
 371     TRACE("(currentfield=%d)\n", currentfield);
 372
 373     if (currentfield < 0 || currentfield > 3) return FALSE;
 374
 375     if (!GetWindowTextW (part->EditHwnd, field, 4)) return FALSE;
 376
 377     curValue = atoiW(field);
 378     TRACE("  curValue=%d\n", curValue);
 379
 380     newValue = IPADDRESS_IPNotify(infoPtr, currentfield, curValue);
 381     TRACE("  newValue=%d\n", newValue);
 382
 383     if (newValue < part->LowerLimit) newValue = part->LowerLimit;
 384     if (newValue > part->UpperLimit) newValue = part->UpperLimit;
 385
 386     if (newValue == curValue) return FALSE;
 387
 388     wsprintfW (field, fmt, newValue);
 389     TRACE("  field=%s\n", debugstr_w(field));
 390     return SetWindowTextW (part->EditHwnd, field);
 391 }
 392
 393
 394 static BOOL IPADDRESS_GotoNextField (const IPADDRESS_INFO *infoPtr, int cur, int sel)
 395 {
 396     TRACE("\n");
 397
 398     if(cur >= -1 && cur < 4) {
 399         IPADDRESS_ConstrainField(infoPtr, cur);
 400
 401         if(cur < 3) {
 402             const IPPART_INFO *next = &infoPtr->Part[cur + 1];
 403             int start = 0, end = 0;
 404             SetFocus (next->EditHwnd);
 405             if (sel != POS_DEFAULT) {
 406                 if (sel == POS_RIGHT)
 407                     start = end = GetWindowTextLengthW(next->EditHwnd);
 408                 else if (sel == POS_SELALL)
 409                     end = -1;
 410                 SendMessageW(next->EditHwnd, EM_SETSEL, start, end);
 411             }
 412             return TRUE;
 413         }
 414
 415     }
 416     return FALSE;
 417 }
 418
 419
 420 /*
 421  * period: move and select the text in the next field to the right if
 422  *         the current field is not empty(l!=0), we are not in the
 423  *         left most position, and nothing is selected(startsel==endsel)
 424  *
 425  * spacebar: same behavior as period
 426  *
 427  * alpha characters: completely ignored
 428  *
 429  * digits: accepted when field text length < 2 ignored otherwise.
 430  *         when 3 numbers have been entered into the field the value
 431  *         of the field is checked, if the field value exceeds the
 432  *         maximum value and is changed the field remains the current
 433  *         field, otherwise focus moves to the field to the right
 434  *
 435  * tab: change focus from the current ipaddress control to the next
 436  *      control in the tab order
 437  *
 438  * right arrow: move to the field on the right to the left most
 439  *              position in that field if no text is selected,
 440  *              we are in the right most position in the field,
 441  *              we are not in the right most field
 442  *
 443  * left arrow: move to the field on the left to the right most
 444  *             position in that field if no text is selected,
 445  *             we are in the left most position in the current field
 446  *             and we are not in the left most field
 447  *
 448  * backspace: delete the character to the left of the cursor position,
 449  *            if none are present move to the field on the left if
 450  *            we are not in the left most field and delete the right
 451  *            most digit in that field while keeping the cursor
 452  *            on the right side of the field
 453  */
 454 LRESULT CALLBACK
 455 IPADDRESS_SubclassProc (HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 456 {
 457     HWND Self = (HWND)GetPropW (hwnd, IP_SUBCLASS_PROP);
 458     IPADDRESS_INFO *infoPtr = (IPADDRESS_INFO *)GetWindowLongPtrW (Self, 0);
 459     CHAR c = (CHAR)wParam;
 460     INT index, len = 0, startsel, endsel;
 461     IPPART_INFO *part;
 462
 463     TRACE("(hwnd=%p msg=0x%x wparam=0x%lx lparam=0x%lx)\n", hwnd, uMsg, wParam, lParam);
 464
 465     if ( (index = IPADDRESS_GetPartIndex(infoPtr, hwnd)) < 0) return 0;
 466     part = &infoPtr->Part[index];
 467
 468     if (uMsg == WM_CHAR || uMsg == WM_KEYDOWN) {
 469         len = GetWindowTextLengthW (hwnd);
 470         SendMessageW(hwnd, EM_GETSEL, (WPARAM)&startsel, (LPARAM)&endsel);
 471     }
 472     switch (uMsg) {
 473         case WM_CHAR:
 474             if(isdigit(c)) {
 475                 if(len == 2 && startsel==endsel && endsel==len) {
 476                     /* process the digit press before we check the field */
 477                     int return_val = CallWindowProcW (part->OrigProc, hwnd, uMsg, wParam, lParam);
 478
 479                     /* if the field value was changed stay at the current field */
 480                     if(!IPADDRESS_ConstrainField(infoPtr, index))
 481                         IPADDRESS_GotoNextField (infoPtr, index, POS_DEFAULT);
 482
 483                     return return_val;
 484                 } else if (len == 3 && startsel==endsel && endsel==len)
 485                     IPADDRESS_GotoNextField (infoPtr, index, POS_SELALL);
 486                 else if (len < 3) break;
 487             } else if(c == '.' || c == ' ') {
 488                 if(len && startsel==endsel && startsel != 0) {
 489                     IPADDRESS_GotoNextField(infoPtr, index, POS_SELALL);
 490                 }
 491             } else if (c == VK_BACK) break;
 492             return 0;
 493
 494         case WM_KEYDOWN:
 495             switch(c) {
 496                 case VK_RIGHT:
 497                     if(startsel==endsel && startsel==len) {
 498                         IPADDRESS_GotoNextField(infoPtr, index, POS_LEFT);
 499                         return 0;
 500                     }
 501                     break;
 502                 case VK_LEFT:
 503                     if(startsel==0 && startsel==endsel && index > 0) {
 504                         IPADDRESS_GotoNextField(infoPtr, index - 2, POS_RIGHT);
 505                         return 0;
 506                     }
 507                     break;
 508                 case VK_BACK:
 509                     if(startsel==endsel && startsel==0 && index > 0) {
 510                         IPPART_INFO *prev = &infoPtr->Part[index-1];
 511                         WCHAR val[10];
 512
 513                         if(GetWindowTextW(prev->EditHwnd, val, 5)) {
 514                             val[lstrlenW(val) - 1] = 0;
 515                             SetWindowTextW(prev->EditHwnd, val);
 516                         }
 517
 518                         IPADDRESS_GotoNextField(infoPtr, index - 2, POS_RIGHT);
 519                         return 0;
 520                     }
 521                     break;
 522             }
 523             break;
 524         case WM_KILLFOCUS:
 525             if (IPADDRESS_GetPartIndex(infoPtr, (HWND)wParam) < 0)
 526                 IPADDRESS_Notify(infoPtr, EN_KILLFOCUS);
 527             break;
 528         case WM_SETFOCUS:
 529             if (IPADDRESS_GetPartIndex(infoPtr, (HWND)wParam) < 0)
 530                 IPADDRESS_Notify(infoPtr, EN_SETFOCUS);
 531             break;
 532     }
 533     return CallWindowProcW (part->OrigProc, hwnd, uMsg, wParam, lParam);
 534 }
 535
 536
 537 static LRESULT WINAPI
 538 IPADDRESS_WindowProc (HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 539 {
 540     IPADDRESS_INFO *infoPtr = (IPADDRESS_INFO *)GetWindowLongPtrW (hwnd, 0);
 541
 542     TRACE("(hwnd=%p msg=0x%x wparam=0x%lx lparam=0x%lx)\n", hwnd, uMsg, wParam, lParam);
 543
 544     if (!infoPtr && (uMsg != WM_CREATE))
 545         return DefWindowProcW (hwnd, uMsg, wParam, lParam);
 546
 547     switch (uMsg)
 548     {
 549         case WM_CREATE:
 550             return IPADDRESS_Create (hwnd, (LPCREATESTRUCTA)lParam);
 551
 552         case WM_DESTROY:
 553             return IPADDRESS_Destroy (infoPtr);
 554
 555         case WM_ENABLE:
 556             return IPADDRESS_Enable (infoPtr, (BOOL)wParam);
 557
 558         case WM_PAINT:
 559             return IPADDRESS_Paint (infoPtr, (HDC)wParam);
 560
 561         case WM_COMMAND:
 562             switch(wParam >> 16) {
 563                 case EN_CHANGE:
 564                     IPADDRESS_Notify(infoPtr, EN_CHANGE);
 565                     break;
 566                 case EN_KILLFOCUS:
 567                     IPADDRESS_ConstrainField(infoPtr, IPADDRESS_GetPartIndex(infoPtr, (HWND)lParam));
 568                     break;
 569             }
 570             break;
 571
 572         case IPM_CLEARADDRESS:
 573             IPADDRESS_ClearAddress (infoPtr);
 574             break;
 575
 576         case IPM_SETADDRESS:
 577             return IPADDRESS_SetAddress (infoPtr, (DWORD)lParam);
 578
 579         case IPM_GETADDRESS:
 580             return IPADDRESS_GetAddress (infoPtr, (LPDWORD)lParam);
 581
 582         case IPM_SETRANGE:
 583             return IPADDRESS_SetRange (infoPtr, (int)wParam, (WORD)lParam);
 584
 585         case IPM_SETFOCUS:
 586             IPADDRESS_SetFocusToField (infoPtr, (int)wParam);
 587             break;
 588
 589         case IPM_ISBLANK:
 590             return IPADDRESS_IsBlank (infoPtr);
 591
 592         default:
 593             if ((uMsg >= WM_USER) && (uMsg < WM_APP) && !COMCTL32_IsReflectedMessage(uMsg))
 594                 ERR("unknown msg %04x wp=%08lx lp=%08lx\n", uMsg, wParam, lParam);
 595             return DefWindowProcW (hwnd, uMsg, wParam, lParam);
 596     }
 597     return 0;
 598 }
 599
 600
 601 void IPADDRESS_Register (void)
 602 {
 603     WNDCLASSW wndClass;
 604
 605     ZeroMemory (&wndClass, sizeof(WNDCLASSW));
 606     wndClass.style         = CS_GLOBALCLASS | CS_DBLCLKS | CS_HREDRAW | CS_VREDRAW;
 607     wndClass.lpfnWndProc   = IPADDRESS_WindowProc;
 608     wndClass.cbClsExtra    = 0;
 609     wndClass.cbWndExtra    = sizeof(IPADDRESS_INFO *);
 610     wndClass.hCursor       = LoadCursorW (0, (LPWSTR)IDC_IBEAM);
 611     wndClass.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
 612     wndClass.lpszClassName = WC_IPADDRESSW;
 613
 614     RegisterClassW (&wndClass);
 615 }
 616
 617
 618 void IPADDRESS_Unregister (void)
 619 {
 620     UnregisterClassW (WC_IPADDRESSW, NULL);
 621 }