windows/winhelp.c

   1 /*
   2  * Windows Help
   3  *
   4  * Copyright 1996 Martin von Loewis
   5  *           2002 Eric Pouech
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include "config.h"
  23
  24 #include <stdlib.h>
  25 #include <stdio.h>
  26 #include <string.h>
  27 #ifdef HAVE_UNISTD_H
  28 # include <unistd.h>
  29 #endif
  30 #include "wine/debug.h"
  31 #include "winbase.h"
  32 #include "wingdi.h"
  33 #include "winuser.h"
  34 #include "winnls.h"
  35
  36 WINE_DEFAULT_DEBUG_CHANNEL(win);
  37
  38 /* Wine doesn't use the way WinHelp API sends information in Windows, because:
  39  * 1/ it's not consistent acrosss Win9x, NT...
  40  * 2/ NT implementation is not yet fully understood (and includes some shared
  41  *     memory mechanism)
  42  * 3/ uses a dynamically allocated message number (WM_WINHELP), which
  43  *    obfuscates the code
  44  *
  45  * So we use (for now) the simple protocol:
  46  * 1/ it's based on copy data
  47  * 2/ we tag the message with a magic number, to make it a bit more robust
  48  *   (even if it's not 100% safe)
  49  * 3/ data structure (WINHELP) has the same layout that the one used on Win95.
  50  *    This doesn't bring much, except not going to far away from real
  51  *    implementation.
  52  *
  53  * This means anyway that native winhelp.exe and winhlp32.exe cannot be
  54  * called/manipulated from WinHelp API.
  55  */
  56 typedef struct
  57 {
  58     WORD size;
  59     WORD command;
  60     LONG data;
  61     LONG reserved;
  62     WORD ofsFilename;
  63     WORD ofsData;
  64 } WINHELP;
  65
  66 /* magic number for this message:
  67  *  aide means help is French ;-)
  68  *  SOS means ???
  69  */
  70 #define WINHELP_MAGIC   0xA1DE505
  71
  72 /**********************************************************************
  73  *              WinHelpA (USER32.@)
  74  */
  75 BOOL WINAPI WinHelpA( HWND hWnd, LPCSTR lpHelpFile, UINT wCommand, ULONG_PTR dwData )
  76 {
  77     COPYDATASTRUCT      cds;
  78     HWND                hDest;
  79     int                 size, dsize, nlen;
  80     WINHELP*            lpwh;
  81
  82     hDest = FindWindowA("MS_WINHELP", NULL);
  83     if (!hDest)
  84     {
  85         if (wCommand == HELP_QUIT) return TRUE;
  86         if (WinExec("winhelp.exe -x", SW_SHOWNORMAL) < 32)
  87         {
  88             ERR("can't start winhelp.exe -x ?\n");
  89             return FALSE;
  90         }
  91         if (!(hDest = FindWindowA("MS_WINHELP", NULL)))
  92         {
  93             FIXME("Did not find a MS_WINHELP Window\n");
  94             return FALSE;
  95         }
  96     }
  97
  98     switch (wCommand)
  99     {
 100     case HELP_CONTEXT:
 101     case HELP_SETCONTENTS:
 102     case HELP_CONTENTS:
 103     case HELP_CONTEXTPOPUP:
 104     case HELP_FORCEFILE:
 105     case HELP_HELPONHELP:
 106     case HELP_FINDER:
 107     case HELP_QUIT:
 108         dsize = 0;
 109         break;
 110     case HELP_KEY:
 111     case HELP_PARTIALKEY:
 112     case HELP_COMMAND:
 113         dsize = dwData ? strlen((LPSTR)dwData) + 1 : 0;
 114         break;
 115     case HELP_MULTIKEY:
 116         dsize = ((LPMULTIKEYHELPA)dwData)->mkSize;
 117         break;
 118     case HELP_SETWINPOS:
 119         dsize = ((LPHELPWININFOA)dwData)->wStructSize;
 120         break;
 121     default:
 122         FIXME("Unknown help command %d\n", wCommand);
 123         return FALSE;
 124     }
 125     if (lpHelpFile)
 126         nlen = strlen(lpHelpFile) + 1;
 127     else
 128         nlen = 0;
 129     size = sizeof(WINHELP) + nlen + dsize;
 130
 131     lpwh = HeapAlloc(GetProcessHeap(), 0, size);
 132     if (!lpwh) return FALSE;
 133
 134     cds.dwData = WINHELP_MAGIC;
 135     cds.cbData = size;
 136     cds.lpData = (void*)lpwh;
 137
 138     lpwh->size = size;
 139     lpwh->command = wCommand;
 140     lpwh->data = dwData;
 141     if (nlen)
 142     {
 143         strcpy(((char*)lpwh) + sizeof(WINHELP), lpHelpFile);
 144         lpwh->ofsFilename = sizeof(WINHELP);
 145     } else
 146         lpwh->ofsFilename = 0;
 147     if (dsize)
 148     {
 149         memcpy(((char*)lpwh) + sizeof(WINHELP) + nlen, (LPSTR)dwData, dsize);
 150         lpwh->ofsData = sizeof(WINHELP) + nlen;
 151     } else
 152         lpwh->ofsData = 0;
 153     WINE_TRACE("Sending[%u]: cmd=%u data=%08lx fn=%s\n",
 154                lpwh->size, lpwh->command, lpwh->data,
 155                lpwh->ofsFilename ? (LPSTR)lpwh + lpwh->ofsFilename : "");
 156
 157     return SendMessageA(hDest, WM_COPYDATA, hWnd, (LPARAM)&cds);
 158 }
 159
 160
 161 /**********************************************************************
 162  *              WinHelpW (USER32.@)
 163  */
 164 BOOL WINAPI WinHelpW( HWND hWnd, LPCWSTR helpFile, UINT command, ULONG_PTR dwData )
 165 {
 166     INT len;
 167     LPSTR file;
 168     BOOL ret = FALSE;
 169
 170     if (!helpFile) return WinHelpA( hWnd, NULL, command, dwData );
 171
 172     len = WideCharToMultiByte( CP_ACP, 0, helpFile, -1, NULL, 0, NULL, NULL );
 173     if ((file = HeapAlloc( GetProcessHeap(), 0, len )))
 174     {
 175         WideCharToMultiByte( CP_ACP, 0, helpFile, -1, file, len, NULL, NULL );
 176         ret = WinHelpA( hWnd, file, command, dwData );
 177         HeapFree( GetProcessHeap(), 0, file );
 178     }
 179     return ret;
 180 }