registryassociations.cpp

7z一个高压缩比的压缩程序源代码,重要的是里面的算法值得学习

// RegistryAssociations.cpp

#include "StdAfx.h"

#include "RegistryAssociations.h"

#include "Common/StringConvert.h"
#include "Common/IntToString.h"
#include "Common/StringToInt.h"

#include "Windows/Synchronization.h"
#include "Windows/Registry.h"

#include "Windows/FileName.h"

#include "StringUtils.h"

using namespace NWindows;
using namespace NRegistry;


namespace NRegistryAssociations {
  
static NSynchronization::CCriticalSection g_CriticalSection;

#define REG_PATH_FM TEXT("Software") TEXT(STRING_PATH_SEPARATOR) TEXT("7-ZIP") TEXT(STRING_PATH_SEPARATOR) TEXT("FM")

static const TCHAR *kCUKeyPath = REG_PATH_FM;
static const WCHAR *kExtPlugins = L"Plugins";
static const TCHAR *kExtEnabled = TEXT("Enabled");

#define kAssociations TEXT("Associations")
#define kAssociationsPath REG_PATH_FM TEXT(STRING_PATH_SEPARATOR) kAssociations

bool ReadInternalAssociation(const wchar_t *ext, CExtInfo &extInfo)
{
  NSynchronization::CCriticalSectionLock lock(g_CriticalSection);
  CKey key;
  if (key.Open(HKEY_CURRENT_USER,
      CSysString(kAssociationsPath TEXT(STRING_PATH_SEPARATOR)) +
      GetSystemString(ext), KEY_READ) != ERROR_SUCCESS)
    return false;
  UString pluginsString;
  key.QueryValue(kExtPlugins, pluginsString);
  SplitString(pluginsString, extInfo.Plugins);
  return true;
}

void ReadInternalAssociations(CObjectVector<CExtInfo> &items)
{
  items.Clear();
  NSynchronization::CCriticalSectionLock lock(g_CriticalSection);
  CKey associationsKey;
  if (associationsKey.Open(HKEY_CURRENT_USER, kAssociationsPath, KEY_READ) != ERROR_SUCCESS)
    return;
  CSysStringVector extNames;
  associationsKey.EnumKeys(extNames);
  for(int i = 0; i < extNames.Size(); i++)
  {
    const CSysString extName = extNames[i];
    CExtInfo extInfo;
    // extInfo.Enabled = false;
    extInfo.Ext = GetUnicodeString(extName);
    CKey key;
    if (key.Open(associationsKey, extName, KEY_READ) != ERROR_SUCCESS)
      return;
    UString pluginsString;
    key.QueryValue(kExtPlugins, pluginsString);
    SplitString(pluginsString, extInfo.Plugins);
    /*
    if (key.QueryValue(kExtEnabled, extInfo.Enabled) != ERROR_SUCCESS)
      extInfo.Enabled = false;
    */
    items.Add(extInfo);
  }
}

void WriteInternalAssociations(const CObjectVector<CExtInfo> &items)
{
  NSynchronization::CCriticalSectionLock lock(g_CriticalSection);
  CKey mainKey;
  mainKey.Create(HKEY_CURRENT_USER, kCUKeyPath);
  mainKey.RecurseDeleteKey(kAssociations);
  CKey associationsKey;
  associationsKey.Create(mainKey, kAssociations);
  for(int i = 0; i < items.Size(); i++)
  {
    const CExtInfo &extInfo = items[i];
    CKey key;
    key.Create(associationsKey, GetSystemString(extInfo.Ext));
    key.SetValue(kExtPlugins, JoinStrings(extInfo.Plugins));
    // key.SetValue(kExtEnabled, extInfo.Enabled);
  }
}

///////////////////////////////////
// External

static const TCHAR *kShellNewKeyName = TEXT("ShellNew");
static const TCHAR *kShellNewDataValueName = TEXT("Data");
  
static const TCHAR *kDefaultIconKeyName = TEXT("DefaultIcon");
static const TCHAR *kShellKeyName = TEXT("shell");
static const TCHAR *kOpenKeyName = TEXT("open");
static const TCHAR *kCommandKeyName = TEXT("command");

static CSysString GetExtensionKeyName(const CSysString &extension)
{
  return CSysString(TEXT(".")) + extension;
}

static CSysString GetExtProgramKeyName(const CSysString &extension)
{
  return CSysString(TEXT("7-Zip.")) + extension;
}

static bool CheckShellExtensionInfo2(const CSysString &extension, UString &iconPath, int &iconIndex)
{
  iconIndex = -1;
  iconPath.Empty();
  NSynchronization::CCriticalSectionLock lock(g_CriticalSection);
  CKey extKey;
  if (extKey.Open(HKEY_CLASSES_ROOT, GetExtensionKeyName(extension), KEY_READ) != ERROR_SUCCESS)
    return false;
  CSysString programNameValue;
  if (extKey.QueryValue(NULL, programNameValue) != ERROR_SUCCESS)
    return false;
  CSysString extProgramKeyName = GetExtProgramKeyName(extension);
  UString programNameValueU = GetUnicodeString(programNameValue);
  if (programNameValueU.CompareNoCase(GetUnicodeString(extProgramKeyName)) != 0)
    return false;
  CKey iconKey;
  if (extKey.Open(HKEY_CLASSES_ROOT, extProgramKeyName + CSysString(TEXT(CHAR_PATH_SEPARATOR)) + kDefaultIconKeyName, KEY_READ) != ERROR_SUCCESS)
    return false;
  UString value;
  if (extKey.QueryValue(NULL, value) == ERROR_SUCCESS)
  {
    int pos = value.ReverseFind(L',');
    iconPath = value;
    if (pos >= 0)
    {
      const wchar_t *end;
      UInt64 index = ConvertStringToUInt64((const wchar_t *)value + pos + 1, &end);
      if (*end == 0)
      {
        iconIndex = (int)index;
        iconPath = value.Left(pos);
      }
    }
  }
  return true;
}

bool CheckShellExtensionInfo(const CSysString &extension, UString &iconPath, int &iconIndex)
{
  NSynchronization::CCriticalSectionLock lock(g_CriticalSection);
  if (!CheckShellExtensionInfo2(extension, iconPath, iconIndex))
    return false;
  CKey extProgKey;
  return (extProgKey.Open(HKEY_CLASSES_ROOT, GetExtProgramKeyName(extension), KEY_READ) == ERROR_SUCCESS);
}

static void DeleteShellExtensionKey(const CSysString &extension)
{
  NSynchronization::CCriticalSectionLock lock(g_CriticalSection);
  CKey rootKey;
  rootKey.Attach(HKEY_CLASSES_ROOT);
  rootKey.RecurseDeleteKey(GetExtensionKeyName(extension));
  rootKey.Detach();
}

static void DeleteShellExtensionProgramKey(const CSysString &extension)
{
  NSynchronization::CCriticalSectionLock lock(g_CriticalSection);
  CKey rootKey;
  rootKey.Attach(HKEY_CLASSES_ROOT);
  rootKey.RecurseDeleteKey(GetExtProgramKeyName(extension));
  rootKey.Detach();
}

void DeleteShellExtensionInfo(const CSysString &extension)
{
  UString iconPath;
  int iconIndex;
  if (CheckShellExtensionInfo2(extension, iconPath, iconIndex))
    DeleteShellExtensionKey(extension);
  DeleteShellExtensionProgramKey(extension);
}

void AddShellExtensionInfo(const CSysString &extension,
    const UString &programTitle,
    const UString &programOpenCommand,
    const UString &iconPath, int iconIndex,
    const void *shellNewData, int shellNewDataSize)
{
  DeleteShellExtensionKey(extension);
  DeleteShellExtensionProgramKey(extension);
  NSynchronization::CCriticalSectionLock lock(g_CriticalSection);
  CSysString programKeyName = GetExtProgramKeyName(extension);
  {
    CKey extKey;
    extKey.Create(HKEY_CLASSES_ROOT, GetExtensionKeyName(extension));
    extKey.SetValue(NULL, programKeyName);
    if (shellNewData != NULL)
    {
      CKey shellNewKey;
      shellNewKey.Create(extKey, kShellNewKeyName);
      shellNewKey.SetValue(kShellNewDataValueName, shellNewData, shellNewDataSize);
    }
  }
  CKey programKey;
  programKey.Create(HKEY_CLASSES_ROOT, programKeyName);
  programKey.SetValue(NULL, programTitle);
  {
    CKey iconKey;
    iconKey.Create(programKey, kDefaultIconKeyName);
    UString iconPathFull = iconPath;
    if (iconIndex >= 0)
    {
      iconPathFull += L",";
      wchar_t s[32];
      ConvertUInt64ToString((UInt64)iconIndex, s);
      iconPathFull += s;
    }
    iconKey.SetValue(NULL, iconPathFull);
  }

  CKey shellKey;
  shellKey.Create(programKey, kShellKeyName);
  shellKey.SetValue(NULL, TEXT(""));

  CKey openKey;
  openKey.Create(shellKey, kOpenKeyName);
  openKey.SetValue(NULL, TEXT(""));
  
  CKey commandKey;
  commandKey.Create(openKey, kCommandKeyName);

  commandKey.SetValue(NULL, programOpenCommand);
}

///////////////////////////
// ContextMenu
/*

static const TCHAR *kContextMenuKeyName = TEXT("\\shellex\\ContextMenuHandlers\\7-ZIP");
static const TCHAR *kContextMenuHandlerCLASSIDValue =
    TEXT("{23170F69-40C1-278A-1000-000100020000}");
static const TCHAR *kRootKeyNameForFile = TEXT("*");
static const TCHAR *kRootKeyNameForFolder = TEXT("Folder");

static CSysString GetFullContextMenuKeyName(const CSysString &aKeyName)
  { return (aKeyName + kContextMenuKeyName); }

static bool CheckContextMenuHandlerCommon(const CSysString &aKeyName)
{
  NSynchronization::CCriticalSectionLock lock(&g_CriticalSection, true);
  CKey aKey;
  if (aKey.Open(HKEY_CLASSES_ROOT, GetFullContextMenuKeyName(aKeyName), KEY_READ)
      != ERROR_SUCCESS)
    return false;
  CSysString aValue;
  if (aKey.QueryValue(NULL, aValue) != ERROR_SUCCESS)
    return false;
  return (aValue.CompareNoCase(kContextMenuHandlerCLASSIDValue) == 0);
}

bool CheckContextMenuHandler()
{
  return CheckContextMenuHandlerCommon(kRootKeyNameForFile) &&
    CheckContextMenuHandlerCommon(kRootKeyNameForFolder);
}

static void DeleteContextMenuHandlerCommon(const CSysString &aKeyName)
{
  CKey rootKey;
  rootKey.Attach(HKEY_CLASSES_ROOT);
  rootKey.RecurseDeleteKey(GetFullContextMenuKeyName(aKeyName));
  rootKey.Detach();
}

void DeleteContextMenuHandler()
{
  DeleteContextMenuHandlerCommon(kRootKeyNameForFile);
  DeleteContextMenuHandlerCommon(kRootKeyNameForFolder);
}

static void AddContextMenuHandlerCommon(const CSysString &aKeyName)
{
  DeleteContextMenuHandlerCommon(aKeyName);
  NSynchronization::CCriticalSectionLock lock(&g_CriticalSection, true);
  CKey aKey;
  aKey.Create(HKEY_CLASSES_ROOT, GetFullContextMenuKeyName(aKeyName));
  aKey.SetValue(NULL, kContextMenuHandlerCLASSIDValue);
}

void AddContextMenuHandler()
{
  AddContextMenuHandlerCommon(kRootKeyNameForFile);
  AddContextMenuHandlerCommon(kRootKeyNameForFolder);
}
*/

}