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     2 **

     3 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

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     7 ** This file is part of the qmake application of the Qt Toolkit.

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     9 ** $QT_BEGIN_LICENSE:LGPL$

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    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

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    38 ** $QT_END_LICENSE$

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    40 ****************************************************************************/

    41 

    42 #include <QtCore/qstringlist.h>

    43 #include "registry.h"

    44 

    45 /*!

    46   Returns the path part of a registry key.

    47   e.g.

    48       For a key

    49           "Software\\Microsoft\\VisualStudio\\8.0\\Setup\\VC\\ProductDir"

    50       it returns

    51           "Software\\Microsoft\\VisualStudio\\8.0\\Setup\\VC\\"

    52 */

    53 static QString keyPath(const QString &rKey)

    54 {

    55     int idx = rKey.lastIndexOf(QLatin1Char('\\'));

    56     if (idx == -1)

    57         return QString();

    58     return rKey.left(idx + 1);

    59 }

    60 

    61 /*!

    62   Returns the name part of a registry key.

    63   e.g.

    64       For a key

    65           "Software\\Microsoft\\VisualStudio\\8.0\\Setup\\VC\\ProductDir"

    66       it returns

    67           "ProductDir"

    68 */

    69 static QString keyName(const QString &rKey)

    70 {

    71     int idx = rKey.lastIndexOf(QLatin1Char('\\'));

    72     if (idx == -1)

    73         return rKey;

    74 

    75     QString res(rKey.mid(idx + 1));

    76     if (res == "Default" || res == ".")

    77         res = "";

    78     return res;

    79 }

    80 

    81 QString readRegistryKey(HKEY parentHandle, const QString &rSubkey)

    82 {

    83     QString result;

    84 

    85 #ifdef Q_OS_WIN32

    86     QString rSubkeyName = keyName(rSubkey);

    87     QString rSubkeyPath = keyPath(rSubkey);

    88 

    89     HKEY handle = 0;

    90     LONG res = RegOpenKeyEx(parentHandle, (wchar_t*)rSubkeyPath.utf16(), 0, KEY_READ, &handle);

    91 

    92     if (res != ERROR_SUCCESS)

    93         return QString();

    94 

    95     // get the size and type of the value

    96     DWORD dataType;

    97     DWORD dataSize;

    98     res = RegQueryValueEx(handle, (wchar_t*)rSubkeyName.utf16(), 0, &dataType, 0, &dataSize);

    99     if (res != ERROR_SUCCESS) {

   100         RegCloseKey(handle);

   101         return QString();

   102     }

   103 

   104     // get the value

   105     QByteArray data(dataSize, 0);

   106     res = RegQueryValueEx(handle, (wchar_t*)rSubkeyName.utf16(), 0, 0,

   107                           reinterpret_cast<unsigned char*>(data.data()), &dataSize);

   108     if (res != ERROR_SUCCESS) {

   109         RegCloseKey(handle);

   110         return QString();

   111     }

   112 

   113     switch (dataType) {

   114         case REG_EXPAND_SZ:

   115         case REG_SZ: {

   116             result = QString::fromWCharArray(((const wchar_t *)data.constData()));

   117             break;

   118         }

   119 

   120         case REG_MULTI_SZ: {

   121             QStringList l;

   122             int i = 0;

   123             for (;;) {

   124                 QString s = QString::fromWCharArray((const wchar_t *)data.constData() + i);

   125                 i += s.length() + 1;

   126 

   127                 if (s.isEmpty())

   128                     break;

   129                 l.append(s);

   130             }

   131             result = l.join(", ");

   132             break;

   133         }

   134 

   135         case REG_NONE:

   136         case REG_BINARY: {

   137             result = QString::fromWCharArray((const wchar_t *)data.constData(), data.size() / 2);

   138             break;

   139         }

   140 

   141         case REG_DWORD_BIG_ENDIAN:

   142         case REG_DWORD: {

   143             Q_ASSERT(data.size() == sizeof(int));

   144             int i;

   145             memcpy((char*)&i, data.constData(), sizeof(int));

   146             result = QString::number(i);

   147             break;

   148         }

   149 

   150         default:

   151             qWarning("QSettings: unknown data %d type in windows registry", dataType);

   152             break;

   153     }

   154 

   155     RegCloseKey(handle);

   156 #endif

   157 

   158     return result;

   159 }

   160 

   161