gecko/toolkit/modules/WindowsRegistry.jsm

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
this.EXPORTED_SYMBOLS = ["WindowsRegistry"];
const WindowsRegistry = {
/**
* Safely reads a value from the registry.
*
* @param aRoot
* The root registry to use.
* @param aPath
* The registry path to the key.
* @param aKey
* The key name.
* @return The key value or undefined if it doesn't exist. If the key is
* a REG_MULTI_SZ, an array is returned.
*/
readRegKey: function(aRoot, aPath, aKey) {
const kRegMultiSz = 7;
let registry = Cc["@mozilla.org/windows-registry-key;1"].
createInstance(Ci.nsIWindowsRegKey);
try {
registry.open(aRoot, aPath, Ci.nsIWindowsRegKey.ACCESS_READ);
if (registry.hasValue(aKey)) {
let type = registry.getValueType(aKey);
switch (type) {
case kRegMultiSz:
// nsIWindowsRegKey doesn't support REG_MULTI_SZ type out of the box.
let str = registry.readStringValue(aKey);
return [v for each (v in str.split("\0")) if (v)];
case Ci.nsIWindowsRegKey.TYPE_STRING:
return registry.readStringValue(aKey);
case Ci.nsIWindowsRegKey.TYPE_INT:
return registry.readIntValue(aKey);
default:
throw new Error("Unsupported registry value.");
}
}
} catch (ex) {
} finally {
registry.close();
}
return undefined;
},
};