path: root/CPP/7zip/UI/Explorer/ContextMenu.cpp

// ContextMenu.cpp

#include "StdAfx.h"

#include "ContextMenu.h"

#include "Common/StringConvert.h"

#include "Windows/COM.h"
#include "Windows/DLL.h"
#include "Windows/FileDir.h"
#include "Windows/FileFind.h"
#include "Windows/FileName.h"
#include "Windows/Memory.h"
#include "Windows/Menu.h"
#include "Windows/Process.h"
#include "Windows/Shell.h"

#include "../Common/ArchiveName.h"
#include "../Common/CompressCall.h"
#include "../Common/ExtractingFilePath.h"
#include "../Common/ZipRegistry.h"

#include "../FileManager/FormatUtils.h"

#ifdef LANG
#include "../FileManager/LangUtils.h"
#endif

#include "ContextMenuFlags.h"
#include "MyMessages.h"

#include "resource.h"

using namespace NWindows;


#ifndef UNDER_CE
#define EMAIL_SUPPORT 1
#endif

extern LONG g_DllRefCount;
    
CZipContextMenu::CZipContextMenu()  { InterlockedIncrement(&g_DllRefCount); }
CZipContextMenu::~CZipContextMenu() { InterlockedDecrement(&g_DllRefCount); }

HRESULT CZipContextMenu::GetFileNames(LPDATAOBJECT dataObject, UStringVector &fileNames)
{
  #ifndef UNDER_CE
  fileNames.Clear();
  if (dataObject == NULL)
    return E_FAIL;
  FORMATETC fmte = {CF_HDROP, NULL, DVASPECT_CONTENT, -1, TYMED_HGLOBAL};
  NCOM::CStgMedium stgMedium;
  HRESULT result = dataObject->GetData(&fmte, &stgMedium);
  if (result != S_OK)
    return result;
  stgMedium._mustBeReleased = true;

  NShell::CDrop drop(false);
  NMemory::CGlobalLock globalLock(stgMedium->hGlobal);
  drop.Attach((HDROP)globalLock.GetPointer());
  drop.QueryFileNames(fileNames);
  #endif
  return S_OK;
}

// IShellExtInit

STDMETHODIMP CZipContextMenu::Initialize(LPCITEMIDLIST pidlFolder, LPDATAOBJECT dataObject, HKEY /* hkeyProgID */)
{
  // OutputDebugString(TEXT("::Initialize\r\n"));
  _dropMode = false;
  _dropPath.Empty();
  if (pidlFolder != 0)
  {
    #ifndef UNDER_CE
    if (NShell::GetPathFromIDList(pidlFolder, _dropPath))
    {
      // OutputDebugString(path);
      // OutputDebugString(TEXT("\r\n"));
      NFile::NName::NormalizeDirPathPrefix(_dropPath);
      _dropMode = !_dropPath.IsEmpty();
    }
    else
    #endif
      _dropPath.Empty();
  }

  /*
  m_IsFolder = false;
  if (pidlFolder == 0)
  */
  // pidlFolder is NULL :(
  return GetFileNames(dataObject, _fileNames);
}

HRESULT CZipContextMenu::InitContextMenu(const wchar_t * /* folder */, const wchar_t **names, UInt32 numFiles)
{
  _fileNames.Clear();
  for (UInt32 i = 0; i < numFiles; i++)
    _fileNames.Add(names[i]);
  _dropMode = false;
  return S_OK;
}


/////////////////////////////
// IContextMenu

static LPCWSTR kMainVerb = L"SevenZip";

/*
static LPCTSTR kOpenVerb = TEXT("SevenOpen");
static LPCTSTR kExtractVerb = TEXT("SevenExtract");
static LPCTSTR kExtractHereVerb = TEXT("SevenExtractHere");
static LPCTSTR kExtractToVerb = TEXT("SevenExtractTo");
static LPCTSTR kTestVerb = TEXT("SevenTest");
static LPCTSTR kCompressVerb = TEXT("SevenCompress");
static LPCTSTR kCompressToVerb = TEXT("SevenCompressTo");
static LPCTSTR kCompressEmailVerb = TEXT("SevenCompressEmail");
static LPCTSTR kCompressToEmailVerb = TEXT("SevenCompressToEmail");
*/

struct CContextMenuCommand
{
  UInt32 flag;
  CZipContextMenu::ECommandInternalID CommandInternalID;
  LPCWSTR Verb;
  UINT ResourceID;
  UINT ResourceHelpID;
  UInt32 LangID;
};

static CContextMenuCommand g_Commands[] =
{
  {
    NContextMenuFlags::kOpen,
    CZipContextMenu::kOpen,
    L"Open",
    IDS_CONTEXT_OPEN,
    IDS_CONTEXT_OPEN_HELP,
    0x02000103
  },
  {
    NContextMenuFlags::kExtract,
    CZipContextMenu::kExtract,
    L"Extract",
    IDS_CONTEXT_EXTRACT,
    IDS_CONTEXT_EXTRACT_HELP,
    0x02000105
  },
  {
    NContextMenuFlags::kExtractHere,
    CZipContextMenu::kExtractHere,
    L"ExtractHere",
    IDS_CONTEXT_EXTRACT_HERE,
    IDS_CONTEXT_EXTRACT_HERE_HELP,
    0x0200010B
  },
  {
    NContextMenuFlags::kExtractTo,
    CZipContextMenu::kExtractTo,
    L"ExtractTo",
    IDS_CONTEXT_EXTRACT_TO,
    IDS_CONTEXT_EXTRACT_TO_HELP,
    0x0200010D
  },
  {
    NContextMenuFlags::kTest,
    CZipContextMenu::kTest,
    L"Test",
    IDS_CONTEXT_TEST,
    IDS_CONTEXT_TEST_HELP,
    0x02000109
  },
  {
    NContextMenuFlags::kCompress,
    CZipContextMenu::kCompress,
    L"Compress",
    IDS_CONTEXT_COMPRESS,
    IDS_CONTEXT_COMPRESS_HELP,
    0x02000107,
  },
  {
    NContextMenuFlags::kCompressEmail,
    CZipContextMenu::kCompressEmail,
    L"CompressEmail",
    IDS_CONTEXT_COMPRESS_EMAIL,
    IDS_CONTEXT_COMPRESS_EMAIL_HELP,
    0x02000111
  },
  {
    NContextMenuFlags::kCompressTo7z,
    CZipContextMenu::kCompressTo7z,
    L"CompressTo7z",
    IDS_CONTEXT_COMPRESS_TO,
    IDS_CONTEXT_COMPRESS_TO_HELP,
    0x0200010F
  },
  {
    NContextMenuFlags::kCompressTo7zEmail,
    CZipContextMenu::kCompressTo7zEmail,
    L"CompressTo7zEmail",
    IDS_CONTEXT_COMPRESS_TO_EMAIL,
    IDS_CONTEXT_COMPRESS_TO_EMAIL_HELP,
    0x02000113
  },
  {
    NContextMenuFlags::kCompressToZip,
    CZipContextMenu::kCompressToZip,
    L"CompressToZip",
    IDS_CONTEXT_COMPRESS_TO,
    IDS_CONTEXT_COMPRESS_TO_HELP,
    0x0200010F
  },
  {
    NContextMenuFlags::kCompressToZipEmail,
    CZipContextMenu::kCompressToZipEmail,
    L"CompressToZipEmail",
    IDS_CONTEXT_COMPRESS_TO_EMAIL,
    IDS_CONTEXT_COMPRESS_TO_EMAIL_HELP,
    0x02000113
  }
};

static int FindCommand(CZipContextMenu::ECommandInternalID &id)
{
  for (int i = 0; i < sizeof(g_Commands) / sizeof(g_Commands[0]); i++)
    if (g_Commands[i].CommandInternalID == id)
      return i;
  return -1;
}

void CZipContextMenu::FillCommand(ECommandInternalID id, UString &mainString, CCommandMapItem &commandMapItem)
{
  int i = FindCommand(id);
  if (i < 0)
    return;
  const CContextMenuCommand &command = g_Commands[i];
  commandMapItem.CommandInternalID = command.CommandInternalID;
  commandMapItem.Verb = (UString)kMainVerb + (UString)command.Verb;
  commandMapItem.HelpString = LangString(command.ResourceHelpID, command.LangID + 1);
  mainString = LangString(command.ResourceID, command.LangID);
}

static bool MyInsertMenu(CMenu &menu, int pos, UINT id, const UString &s)
{
  CMenuItem menuItem;
  menuItem.fType = MFT_STRING;
  menuItem.fMask = MIIM_TYPE | MIIM_ID;
  menuItem.wID = id;
  menuItem.StringValue = s;
  return menu.InsertItem(pos, true, menuItem);
}

static const wchar_t *kArcExts[] =
{
  L"7z",
  L"bz2",
  L"gz",
  L"rar",
  L"zip"
};

static bool IsItArcExt(const UString &ext2)
{
  UString ext = ext2;
  ext.MakeLower();
  for (int i = 0; i < sizeof(kArcExts) / sizeof(kArcExts[0]); i++)
    if (ext.Compare(kArcExts[i]) == 0)
      return true;
  return false;
}

static UString GetSubFolderNameForExtract(const UString &archiveName)
{
  int dotPos = archiveName.ReverseFind(L'.');
  if (dotPos < 0)
    return archiveName + UString(L"~");
  const UString ext = archiveName.Mid(dotPos + 1);
  UString res = archiveName.Left(dotPos);
  res.TrimRight();
  dotPos = res.ReverseFind(L'.');
  if (dotPos > 0)
  {
    const UString ext2 = res.Mid(dotPos + 1);
    if (ext.CompareNoCase(L"rar") == 0 &&
        (ext2.CompareNoCase(L"part001") == 0 ||
         ext2.CompareNoCase(L"part01") == 0 ||
         ext2.CompareNoCase(L"part1") == 0) ||
        IsItArcExt(ext2) && ext.CompareNoCase(L"001") == 0)
      res = res.Left(dotPos);
    res.TrimRight();
  }
  return GetCorrectFullFsPath(res);
}

static UString GetReducedString(const UString &s)
{
  const int kMaxSize = 64;
  if (s.Length() < kMaxSize)
    return s;
  const int kFirstPartSize = kMaxSize / 2;
  return s.Left(kFirstPartSize) + UString(L" ... ") + s.Right(kMaxSize - kFirstPartSize);
}

static UString GetQuotedReducedString(const UString &s)
{
  UString s2 = GetReducedString(s);
  s2.Replace(L"&", L"&&");
  return GetQuotedString(s2);
}

static const char *kExtractExludeExtensions =
  " 3gp"
  " aac ans ape asc asm asp aspx avi awk"
  " bas bat bmp"
  " c cs cls clw cmd cpp csproj css ctl cxx"
  " def dep dlg dsp dsw"
  " eps"
  " f f77 f90 f95 fla flac frm"
  " gif"
  " h hpp hta htm html hxx"
  " ico idl inc ini inl"
  " java jpeg jpg js"
  " la"
  " mak manifest wmv mov mp3 mp4 mpe mpeg mpg m4a"
  " ofr ogg"
  " pac pas pdf php php3 php4 php5 phptml pl pm png ps py pyo"
  " ra rb rc reg rka rm rtf"
  " sed sh shn shtml sln sql srt swa"
  " tcl tex tiff tta txt"
  " vb vcproj vbs"
  " wav wma wv"
  " xml xsd xsl xslt"
  " ";

static const char *kNoOpenAsExtensions =
  " 7z arj bz2 cab chm cpio dmg flv gz lha lzh lzma rar swm tar tbz2 tgz wim xar xz z zip ";

static bool FindExt(const char *p, const FString &nameF)
{
  const UString name = fs2us(nameF);
  int extPos = name.ReverseFind('.');
  if (extPos < 0)
    return false;
  UString ext = name.Mid(extPos + 1);
  ext.MakeLower();
  AString ext2 = UnicodeStringToMultiByte(ext);
  for (int i = 0; p[i] != 0;)
  {
    int j;
    for (j = i; p[j] != ' '; j++);
    if (ext2.Length() == j - i && memcmp(p + i, (const char *)ext2, ext2.Length()) == 0)
      return true;
    i = j + 1;
  }
  return false;
}

static bool DoNeedExtract(const FString &name)
{
  return !FindExt(kExtractExludeExtensions, name);
}

STDMETHODIMP CZipContextMenu::QueryContextMenu(HMENU hMenu, UINT indexMenu,
      UINT commandIDFirst, UINT commandIDLast, UINT flags)
{
  LoadLangOneTime();
  if (_fileNames.Size() == 0)
    return E_FAIL;
  UINT currentCommandID = commandIDFirst;
  if ((flags & 0x000F) != CMF_NORMAL  &&
      (flags & CMF_VERBSONLY) == 0 &&
      (flags & CMF_EXPLORE) == 0)
    return MAKE_HRESULT(SEVERITY_SUCCESS, 0, currentCommandID);

  _commandMap.Clear();

  CMenu popupMenu;
  CMenuDestroyer menuDestroyer;

  CContextMenuInfo ci;
  ci.Load();
  MENUITEMINFO menuItem;
  UINT subIndex = indexMenu;
  if (ci.Cascaded)
  {
    CCommandMapItem commandMapItem;
    if (!popupMenu.CreatePopup())
      return E_FAIL;
    menuDestroyer.Attach(popupMenu);
    commandMapItem.CommandInternalID = kCommandNULL;
    commandMapItem.Verb = kMainVerb;
    commandMapItem.HelpString = LangString(IDS_CONTEXT_CAPTION_HELP, 0x02000102);
    _commandMap.Add(commandMapItem);
    
    menuItem.wID = currentCommandID++;
    subIndex = 0;
  }
  else
  {
    popupMenu.Attach(hMenu);
  }

  UInt32 contextMenuFlags = ci.Flags;

  UString mainString;
  if (_fileNames.Size() == 1 && currentCommandID + 6 <= commandIDLast)
  {
    const UString &fileName = _fileNames.Front();
    NFile::NFind::CFileInfo fileInfo;
    if (!fileInfo.Find(us2fs(fileName)))
      return E_FAIL;
    if (!fileInfo.IsDir() && DoNeedExtract(fileInfo.Name))
    {
      // Open
      bool thereIsMainOpenItem = ((contextMenuFlags & NContextMenuFlags::kOpen) != 0);
      if (thereIsMainOpenItem)
      {
        CCommandMapItem commandMapItem;
        FillCommand(kOpen, mainString, commandMapItem);
        MyInsertMenu(popupMenu, subIndex++, currentCommandID++, mainString);
        _commandMap.Add(commandMapItem);
      }
      if ((contextMenuFlags & NContextMenuFlags::kOpenAs) != 0 &&
          (!thereIsMainOpenItem || !FindExt(kNoOpenAsExtensions, fileInfo.Name)))
      {
        CMenu subMenu;
        if (subMenu.CreatePopup())
        {
          CCommandMapItem commandMapItem;
          
          CMenuItem menuItem;
          menuItem.fType = MFT_STRING;
          menuItem.fMask = MIIM_SUBMENU | MIIM_TYPE | MIIM_ID;
          menuItem.wID = currentCommandID++;
          menuItem.hSubMenu = subMenu;
          menuItem.StringValue = LangString(IDS_CONTEXT_OPEN, 0x02000103);
          popupMenu.InsertItem(subIndex++, true, menuItem);
          
          commandMapItem.CommandInternalID = kCommandNULL;
          commandMapItem.Verb = kMainVerb;
          commandMapItem.HelpString = LangString(IDS_CONTEXT_OPEN_HELP, 0x02000104);
          _commandMap.Add(commandMapItem);
          
          UINT subIndex2 = 0;
          const wchar_t *exts[] = { L"", L"*", L"7z", L"zip", L"cab", L"rar" };
          for (int i = (thereIsMainOpenItem ? 1 : 0); i < sizeof(exts) / sizeof(exts[0]); i++)
          {
            CCommandMapItem commandMapItem;
            if (i == 0)
              FillCommand(kOpen, mainString, commandMapItem);
            else
            {
              mainString = exts[i];
              commandMapItem.CommandInternalID = kOpen;
              commandMapItem.Verb = (UString)kMainVerb + L".Open." + mainString;
              commandMapItem.HelpString = mainString;
              commandMapItem.ArcType = mainString;
            }
            MyInsertMenu(subMenu, subIndex2++, currentCommandID++, mainString);
            _commandMap.Add(commandMapItem);
          }
          subMenu.Detach();
        }
      }
    }
  }

  if (_fileNames.Size() > 0 && currentCommandID + 10 <= commandIDLast)
  {
    bool needExtract = false;
    for (int i = 0; i < _fileNames.Size(); i++)
    {
      NFile::NFind::CFileInfo fileInfo;
      if (!fileInfo.Find(us2fs(_fileNames[i])))
        return E_FAIL;
      if (!fileInfo.IsDir() && DoNeedExtract(fileInfo.Name))
        needExtract = true;
    }
    const UString &fileName = _fileNames.Front();
    if (needExtract)
    {
      FString folderPrefix;
      NFile::NDirectory::GetOnlyDirPrefix(us2fs(fileName), folderPrefix);
      NFile::NFind::CFileInfo fileInfo;
      if (!fileInfo.Find(us2fs(fileName)))
        return E_FAIL;
      // Extract
      if ((contextMenuFlags & NContextMenuFlags::kExtract) != 0)
      {
        CCommandMapItem commandMapItem;
        FillCommand(kExtract, mainString, commandMapItem);
        if (_dropMode)
          commandMapItem.Folder = _dropPath;
        else
          commandMapItem.Folder = fs2us(folderPrefix);
        commandMapItem.Folder += GetSubFolderNameForExtract(fs2us(fileInfo.Name)) + UString(WCHAR_PATH_SEPARATOR);
        MyInsertMenu(popupMenu, subIndex++, currentCommandID++, mainString);
        _commandMap.Add(commandMapItem);
      }

      // Extract Here
      if ((contextMenuFlags & NContextMenuFlags::kExtractHere) != 0)
      {
        CCommandMapItem commandMapItem;
        FillCommand(kExtractHere, mainString, commandMapItem);
        MyInsertMenu(popupMenu, subIndex++, currentCommandID++, mainString);
        if (_dropMode)
          commandMapItem.Folder = _dropPath;
        else
          commandMapItem.Folder = fs2us(folderPrefix);
        _commandMap.Add(commandMapItem);
      }

      // Extract To
      if ((contextMenuFlags & NContextMenuFlags::kExtractTo) != 0)
      {
        CCommandMapItem commandMapItem;
        UString s;
        FillCommand(kExtractTo, s, commandMapItem);
        UString folder;
        if (_fileNames.Size() == 1)
          folder = GetSubFolderNameForExtract(fs2us(fileInfo.Name));
        else
          folder = L'*';
        if (_dropMode)
          commandMapItem.Folder = _dropPath;
        else
          commandMapItem.Folder = fs2us(folderPrefix);
        commandMapItem.Folder += folder;
        s = MyFormatNew(s, GetQuotedReducedString(folder + UString(WCHAR_PATH_SEPARATOR)));
        MyInsertMenu(popupMenu, subIndex++, currentCommandID++, s);
        _commandMap.Add(commandMapItem);
      }
      // Test
      if ((contextMenuFlags & NContextMenuFlags::kTest) != 0)
      {
        CCommandMapItem commandMapItem;
        FillCommand(kTest, mainString, commandMapItem);
        MyInsertMenu(popupMenu, subIndex++, currentCommandID++, mainString);
        _commandMap.Add(commandMapItem);
      }
    }
    UString archiveName = CreateArchiveName(fileName, _fileNames.Size() > 1, false);
    UString archiveName7z = archiveName + L".7z";
    UString archiveNameZip = archiveName + L".zip";
    FString archivePathPrefix;
    NFile::NDirectory::GetOnlyDirPrefix(us2fs(fileName), archivePathPrefix);

    // Compress
    if ((contextMenuFlags & NContextMenuFlags::kCompress) != 0)
    {
      CCommandMapItem commandMapItem;
      if (_dropMode)
        commandMapItem.Folder = _dropPath;
      else
        commandMapItem.Folder = fs2us(archivePathPrefix);
      commandMapItem.ArcName = archiveName;
      FillCommand(kCompress, mainString, commandMapItem);
      MyInsertMenu(popupMenu, subIndex++, currentCommandID++, mainString);
      _commandMap.Add(commandMapItem);
    }

    #ifdef EMAIL_SUPPORT
    // CompressEmail
    if ((contextMenuFlags & NContextMenuFlags::kCompressEmail) != 0 && !_dropMode)
    {
      CCommandMapItem commandMapItem;
      commandMapItem.ArcName = archiveName;
      FillCommand(kCompressEmail, mainString, commandMapItem);
      MyInsertMenu(popupMenu, subIndex++, currentCommandID++, mainString);
      _commandMap.Add(commandMapItem);
    }
    #endif

    // CompressTo7z
    if (contextMenuFlags & NContextMenuFlags::kCompressTo7z)
    {
      CCommandMapItem commandMapItem;
      UString s;
      FillCommand(kCompressTo7z, s, commandMapItem);
      if (_dropMode)
        commandMapItem.Folder = _dropPath;
      else
        commandMapItem.Folder = fs2us(archivePathPrefix);
      commandMapItem.ArcName = archiveName7z;
      commandMapItem.ArcType = L"7z";
      s = MyFormatNew(s, GetQuotedReducedString(archiveName7z));
      MyInsertMenu(popupMenu, subIndex++, currentCommandID++, s);
      _commandMap.Add(commandMapItem);
    }

    #ifdef EMAIL_SUPPORT
    // CompressTo7zEmail
    if ((contextMenuFlags & NContextMenuFlags::kCompressTo7zEmail) != 0  && !_dropMode)
    {
      CCommandMapItem commandMapItem;
      UString s;
      FillCommand(kCompressTo7zEmail, s, commandMapItem);
      commandMapItem.ArcName = archiveName7z;
      commandMapItem.ArcType = L"7z";
      s = MyFormatNew(s, GetQuotedReducedString(archiveName7z));
      MyInsertMenu(popupMenu, subIndex++, currentCommandID++, s);
      _commandMap.Add(commandMapItem);
    }
    #endif

    // CompressToZip
    if (contextMenuFlags & NContextMenuFlags::kCompressToZip)
    {
      CCommandMapItem commandMapItem;
      UString s;
      FillCommand(kCompressToZip, s, commandMapItem);
      if (_dropMode)
        commandMapItem.Folder = _dropPath;
      else
        commandMapItem.Folder = fs2us(archivePathPrefix);
      commandMapItem.ArcName = archiveNameZip;
      commandMapItem.ArcType = L"zip";
      s = MyFormatNew(s, GetQuotedReducedString(archiveNameZip));
      MyInsertMenu(popupMenu, subIndex++, currentCommandID++, s);
      _commandMap.Add(commandMapItem);
    }

    #ifdef EMAIL_SUPPORT
    // CompressToZipEmail
    if ((contextMenuFlags & NContextMenuFlags::kCompressToZipEmail) != 0  && !_dropMode)
    {
      CCommandMapItem commandMapItem;
      UString s;
      FillCommand(kCompressToZipEmail, s, commandMapItem);
      commandMapItem.ArcName = archiveNameZip;
      commandMapItem.ArcType = L"zip";
      s = MyFormatNew(s, GetQuotedReducedString(archiveNameZip));
      MyInsertMenu(popupMenu, subIndex++, currentCommandID++, s);
      _commandMap.Add(commandMapItem);
    }
    #endif
  }


  // don't use InsertMenu:  See MSDN:
  // PRB: Duplicate Menu Items In the File Menu For a Shell Context Menu Extension
  // ID: Q214477

  if (ci.Cascaded)
  {
    CMenuItem menuItem;
    menuItem.fType = MFT_STRING;
    menuItem.fMask = MIIM_SUBMENU | MIIM_TYPE | MIIM_ID;
    menuItem.wID = currentCommandID++;
    menuItem.hSubMenu = popupMenu.Detach();
    menuDestroyer.Disable();
    menuItem.StringValue = LangString(IDS_CONTEXT_POPUP_CAPTION, 0x02000101);
    CMenu menu;
    menu.Attach(hMenu);
    menu.InsertItem(indexMenu++, true, menuItem);
  }

  return MAKE_HRESULT(SEVERITY_SUCCESS, 0, currentCommandID - commandIDFirst);
}


int CZipContextMenu::FindVerb(const UString &verb)
{
  for(int i = 0; i < _commandMap.Size(); i++)
    if (_commandMap[i].Verb.Compare(verb) == 0)
      return i;
  return -1;
}

static UString Get7zFmPath()
{
  return fs2us(NWindows::NDLL::GetModuleDirPrefix()) + L"7zFM.exe";
}

STDMETHODIMP CZipContextMenu::InvokeCommand(LPCMINVOKECOMMANDINFO commandInfo)
{
  // ::OutputDebugStringA("1");
  int commandOffset;

  // It's fix for bug: crashing in XP. See example in MSDN: "Creating Context Menu Handlers".

  #ifndef UNDER_CE
  if (commandInfo->cbSize == sizeof(CMINVOKECOMMANDINFOEX) &&
      (commandInfo->fMask & CMIC_MASK_UNICODE) != 0)
  {
    LPCMINVOKECOMMANDINFOEX commandInfoEx = (LPCMINVOKECOMMANDINFOEX)commandInfo;
    if (HIWORD(commandInfoEx->lpVerbW) == 0)
      commandOffset = LOWORD(commandInfo->lpVerb);
    else
      commandOffset = FindVerb(commandInfoEx->lpVerbW);
  }
  else
  #endif
    if (HIWORD(commandInfo->lpVerb) == 0)
      commandOffset = LOWORD(commandInfo->lpVerb);
    else
      commandOffset = FindVerb(GetUnicodeString(commandInfo->lpVerb));

  if (commandOffset < 0 || commandOffset >= _commandMap.Size())
    return E_FAIL;

  const CCommandMapItem commandMapItem = _commandMap[commandOffset];
  ECommandInternalID cmdID = commandMapItem.CommandInternalID;

  try
  {
    switch(cmdID)
    {
      case kOpen:
      {
        UString params;
        params = GetQuotedString(_fileNames[0]);
        if (commandMapItem.ArcType)
        {
          params += L" -t";
          params += commandMapItem.ArcType;
        }
        MyCreateProcess(Get7zFmPath(), params);
        break;
      }
      case kExtract:
      case kExtractHere:
      case kExtractTo:
      {
        ExtractArchives(_fileNames, commandMapItem.Folder, (cmdID == kExtract));
        break;
      }
      case kTest:
      {
        TestArchives(_fileNames);
        break;
      }
      case kCompress:
      case kCompressEmail:
      case kCompressTo7z:
      case kCompressTo7zEmail:
      case kCompressToZip:
      case kCompressToZipEmail:
      {
        bool email =
            (cmdID == kCompressEmail) ||
            (cmdID == kCompressTo7zEmail) ||
            (cmdID == kCompressToZipEmail);
        bool showDialog =
            (cmdID == kCompress) ||
            (cmdID == kCompressEmail);
        CompressFiles(commandMapItem.Folder,
            commandMapItem.ArcName, commandMapItem.ArcType,
            _fileNames, email, showDialog, false);
        break;
      }
    }
  }
  catch(...)
  {
    ::MessageBoxW(0, L"Error", L"7-Zip", MB_ICONERROR);
  }
  return S_OK;
}

static void MyCopyString(void *dest, const wchar_t *src, bool writeInUnicode)
{
  if (writeInUnicode)
  {
    MyStringCopy((wchar_t *)dest, src);
  }
  else
    MyStringCopy((char *)dest, (const char *)GetAnsiString(src));
}

STDMETHODIMP CZipContextMenu::GetCommandString(UINT_PTR commandOffset, UINT uType,
    UINT * /* pwReserved */ , LPSTR pszName, UINT /* cchMax */)
{
  int cmdOffset = (int)commandOffset;
  switch(uType)
  {
    #ifdef UNDER_CE
    case GCS_VALIDATE:
    #else
    case GCS_VALIDATEA:
    case GCS_VALIDATEW:
    #endif
      if (cmdOffset < 0 || cmdOffset >= _commandMap.Size())
        return S_FALSE;
      else
        return S_OK;
  }
  if (cmdOffset < 0 || cmdOffset >= _commandMap.Size())
    return E_FAIL;
  #ifdef UNDER_CE
  if (uType == GCS_HELPTEXT)
  #else
  if (uType == GCS_HELPTEXTA || uType == GCS_HELPTEXTW)
  #endif
  {
    MyCopyString(pszName, _commandMap[cmdOffset].HelpString,
      #ifdef UNDER_CE
      true
      #else
      uType == GCS_HELPTEXTW
      #endif
      );
    return NO_ERROR;
  }
  #ifdef UNDER_CE
  if (uType == GCS_VERB)
  #else
  if (uType == GCS_VERBA || uType == GCS_VERBW)
  #endif
  {
    MyCopyString(pszName, _commandMap[cmdOffset].Verb,
      #ifdef UNDER_CE
      true
      #else
      uType == GCS_VERBW
      #endif
      );
    return NO_ERROR;
  }
  return E_FAIL;
}