我正在尝试在 Firefox 中使用 js-ctypes 来接收 USB 媒体/驱动器通知，但我遇到了一些问题，我无法判断是否是因为我对 Win32 API 非常缺乏经验，或者对 js-ctypes 很糟糕（或两者！）
我首先改编了我在亚历山大·波洛的博客上找到的一个例子：
- 博客条目 http://blog.techno-barje.fr//post/2010/08/24/jsctypes-unleashed/
- 完整的 JS 源码 http://blog.techno-barje.fr/public/demo/jsctypes/example-jsctypes-full-power.txt
该示例使用 js-ctypes 创建一个“仅消息”窗口，然后与 shell 服务交互，以便与 Windows 通知托盘进行通信。
这看起来很简单，所以在对它的优点进行了一些研究之后注册设备通知 http://msdn.microsoft.com/en-us/library/windows/desktop/aa363431%28v=vs.85%29.aspx vs SHChangeNotify注册 http://msdn.microsoft.com/en-us/library/windows/desktop/bb762120%28v=vs.85%29.aspx，我正在尝试调整该（工作！）示例以通过以下方式注册设备更新SHChangeNotifyRegister.
该代码驻留在引导（无需重新启动）的 Firefox 扩展中（代码如下）。
实施WindowProc效果很好，就像原来的例子一样。我的 JavaScript 回调记录传入的 Window 消息（在本例中仅以数字形式表示）。
问题：
首先，似乎调用DestroyWindow使 Firefox（几乎总是）崩溃shutdown()的扩展名。是否有一些 Windows 消息我应该在“仅消息”窗口上处理以优雅地处理DestryWindow ?
其次，尽管从控制台输出（如下）看来，我从调用中获得了有意义的值SHGetSpecialFolderLocation and SHChangeNotifyRegister (返回值不是错误并且PIDLISTITEM指针是一些真实的地址）我没有在 JavaScript 回调中收到设备/驱动器消息。
另外，我尝试重现PIDLISTITEM结构无济于事（无法得到js-ctypes在通话中识别他们SHChangeNotifyRegister）并且在研究了其他一些非 C++ 示例之后，似乎大多数人只是使用long*相反——我希望这是我误解的根源！
我已经通过类似的方式验证过来自 Microsoft 的 C++ 示例项目 http://msdn.microsoft.com/en-us/library/windows/desktop/dd940348%28v=vs.85%29.aspx当消息本身被接收时SHChangeNotifyRegistration成功，我生成 USB 媒体事件（插入和移除 USB 闪存媒体）。
重现问题的最少代码如下：
安装.rdf:
<?xml version="1.0"?>
<RDF xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:em="http://www.mozilla.org/2004/em-rdf#">
<Description about="urn:mozilla:install-manifest">
<em:id>[email protected] /cdn-cgi/l/email-protection</em:id>
<em:type>2</em:type>
<em:name>TEST WNDPROC</em:name>
<em:version>1.0</em:version>
<em:bootstrap>true</em:bootstrap>
<em:unpack>true</em:unpack>
<em:description>Testing wndProc via JS-CTYPES on WIN32.</em:description>
<em:creator>David</em:creator>
<!-- Firefox Desktop -->
<em:targetApplication>
<Description>
<em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>
<em:minVersion>4.0.*</em:minVersion>
<em:maxVersion>29.0.*</em:maxVersion>
</Description>
</em:targetApplication>
</Description>
</RDF>
bootstrap.js:
const Cc = Components.classes;
const Ci = Components.interfaces;
const Cu = Components.utils;
Components.utils.import("resource://gre/modules/ctypes.jsm");
let consoleService = Cc["@mozilla.org/consoleservice;1"]
.getService(Ci.nsIConsoleService);
function LOG(msg) {
consoleService.logStringMessage("TEST-WNDPROC: "+msg);
}
var WindowProcType, DefWindowProc, RegisterClass, CreateWindowEx,
DestroyWindow, SHGetSpecialFolderLocation, WNDCLASS, wndclass,
messageWin, libs = {};
var windowProcJSCallback = function(hWnd, uMsg, wParam, lParam) {
LOG("windowProc: "+JSON.stringify([uMsg, wParam, lParam]));
//
// TODO: decode uMsg, wParam, lParam to interpret
// the incoming ShChangeNotifyEntry messages!
//
return DefWindowProc(hWnd, uMsg, wParam, lParam);
};
function startup(data, reason) {
try {
LOG("loading USER32.DLL ...");
libs.user32 = ctypes.open("user32.dll");
LOG("loading SHELL32.DLL ...");
libs.shell32 = ctypes.open("shell32.dll");
LOG("registering callback ctype WindowProc ...");
WindowProc = ctypes.FunctionType(
ctypes.stdcall_abi, ctypes.int,
[ctypes.voidptr_t, ctypes.int32_t,
ctypes.int32_t, ctypes.int32_t]).ptr;
LOG("registering API CreateWindowEx ...");
CreateWindowEx = libs.user32.declare("CreateWindowExA",
ctypes.winapi_abi, ctypes.voidptr_t, ctypes.long,
ctypes.char.ptr, ctypes.char.ptr, ctypes.int,
ctypes.int, ctypes.int, ctypes.int, ctypes.int,
ctypes.voidptr_t, ctypes.voidptr_t, ctypes.voidptr_t,
ctypes.voidptr_t);
LOG("registering API DestroyWindow ...");
DestroyWindow = libs.user32.declare("DestroyWindow",
ctypes.winapi_abi, ctypes.bool, ctypes.voidptr_t);
/*
// previously using....
LOG("registering ctype SHITEMID ...");
var ShItemId = ctypes.StructType("ShItemId", [
{ cb: ctypes.unsigned_short },
{ abID: ctypes.uint8_t.array(1) }
]);
LOG("registering ctype ITEMIDLIST ...");
var ItemIDList = ctypes.StructType("ItemIDList", [
{ mkid: ShItemId }
]);
*/
LOG("registering ctype SHChangeNotifyEntry ...");
var SHChangeNotifyEntry = ctypes.StructType(
"SHChangeNotifyEntry", [
{ pidl: ctypes.long.ptr }, /* ItemIDList.ptr ??? */
{ fRecursive: ctypes.bool }
]);
LOG("registering API SHChangeNotifyRegister ...");
SHChangeNotifyRegister = libs.shell32.declare(
"SHChangeNotifyRegister", ctypes.winapi_abi,
ctypes.unsigned_long,
ctypes.voidptr_t, ctypes.int, ctypes.long,
ctypes.unsigned_int, ctypes.int,
SHChangeNotifyEntry.array() /* SHChangeNotifyEntry.ptr ??? */
);
LOG("registering ctype WNDCLASS ...");
WNDCLASS = ctypes.StructType("WNDCLASS", [
{ style : ctypes.uint32_t },
{ lpfnWndProc : WindowProc },
{ cbClsExtra : ctypes.int32_t },
{ cbWndExtra : ctypes.int32_t },
{ hInstance : ctypes.voidptr_t },
{ hIcon : ctypes.voidptr_t },
{ hCursor : ctypes.voidptr_t },
{ hbrBackground : ctypes.voidptr_t },
{ lpszMenuName : ctypes.char.ptr },
{ lpszClassName : ctypes.char.ptr }
]);
LOG("registering API SHGetSpecialFolderLocation ...");
SHGetSpecialFolderLocation = libs.shell32.declare(
"SHGetSpecialFolderLocation", ctypes.winapi_abi,
ctypes.long, ctypes.voidptr_t, ctypes.int,
ctypes.long.ptr /* ItemIDList.ptr ??? */
);
LOG("registering API RegisterClass ...");
RegisterClass = libs.user32.declare("RegisterClassA",
ctypes.winapi_abi, ctypes.voidptr_t, WNDCLASS.ptr);
LOG("registering API DefWindowProc ...");
DefWindowProc = libs.user32.declare("DefWindowProcA",
ctypes.winapi_abi, ctypes.int, ctypes.voidptr_t,
ctypes.int32_t, ctypes.int32_t, ctypes.int32_t);
LOG("instatiating WNDCLASS (using windowProcJSCallback) ...");
var cName = "class-testingmessageonlywindow";
wndclass = WNDCLASS();
wndclass.lpszClassName = ctypes.char.array()(cName);
wndclass.lpfnWndProc = WindowProc(windowProcJSCallback);
LOG("calling API: RegisterClass ...");
RegisterClass(wndclass.address());
LOG("calling API: CreateWindowEx ...");
var HWND_MESSAGE = -3; // message-only window
messageWin = CreateWindowEx(
0, wndclass.lpszClassName,
ctypes.char.array()("my-testing-window"),
0, 0, 0, 0, 0,
ctypes.voidptr_t(HWND_MESSAGE),
null, null, null
);
LOG("instantiating pidl ...");
var pidl = ctypes.long();
LOG("Prior to call, pidl = "+pidl);
LOG("calling API: SHGetSpecialFolderLocation ...");
var CSIDL_DESKTOP = 0;
var hr = SHGetSpecialFolderLocation(
messageWin,
CSIDL_DESKTOP,
pidl.address()
);
LOG("got back: "+hr);
LOG("After the call, pidl = "+pidl);
LOG("instantiating pschcne ...");
var SHCNE = SHChangeNotifyEntry.array(1);
var shcne = SHCNE();
shcne[0].pidl = pidl.address();
shcne[0].fRecursive = false;
var WM_SHNOTIFY = 1025; // 0x401
var SHCNE_DISKEVENTS = 145439; // 0x2381F
var SHCNE_DRIVEADD = 256; // 256
var SHCNE_DRIVEREMOVED = 128; // 128
var SHCNE_MEDIAINSERTED = 32; // 32
var SHCNE_MEDIAREMOVED = 64; // 64
var SHCNRF_ShellLevel = 2; // 0x0002
var SHCNRF_InterruptLevel = 1; // 0x0001
var SHCNRF_NewDelivery = 32768; // 0x8000
var nSources = SHCNRF_ShellLevel |
SHCNRF_InterruptLevel |
SHCNRF_NewDelivery;
var lEvents = SHCNE_DISKEVENTS | SHCNE_DRIVEADD |
SHCNE_DRIVEREMOVED | SHCNE_MEDIAINSERTED |
SHCNE_MEDIAREMOVED;
var uMsg = WM_SHNOTIFY;
LOG("DEBUG: nSources="+nSources);
LOG("DEBUG: lEvents="+lEvents);
LOG("DEBUG: uMsg="+uMsg);
LOG("calling API: SHChangeNotifyRegister ...");
var reg_id = SHChangeNotifyRegister(
messageWin, nSources, lEvents, uMsg, 1, shcne
);
if (reg_id > 0) {
LOG("SUCCESS: Registered with ShellService for "+
"DRIVE/MEDIA notifications! reg-id: "+reg_id);
} else {
LOG("ERROR: Couldn't register for DRIVE/MEDIA "+
"notifications from ShellService!");
}
LOG("done!");
} catch (e) {
LOG("ERROR: "+e);
}
}
function shutdown(data, reason) {
if (reason == APP_SHUTDOWN) return;
try {
//LOG("destroying hidden window... ");
//DestroyWindow(messageWin); // crash!!!
LOG("unloading USER32.DLL ...");
libs.user32.close();
LOG("unloading SHELL32.DLL ...");
libs.shell32.close();
LOG("done!");
} catch (e) {
LOG("ERROR: "+e);
}
}
控制台输出：
17:08:25.518 TEST-WNDPROC: loading USER32.DLL ...
17:08:25.518 TEST-WNDPROC: loading SHELL32.DLL ...
17:08:25.518 TEST-WNDPROC: registering callback ctype WindowProc ...
17:08:25.518 TEST-WNDPROC: registering API CreateWindowEx ...
17:08:25.518 TEST-WNDPROC: registering API DestroyWindow ...
17:08:25.518 TEST-WNDPROC: registering ctype SHChangeNotifyEntry ...
17:08:25.518 TEST-WNDPROC: registering API SHChangeNotifyRegister ...
17:08:25.518 TEST-WNDPROC: registering ctype WNDCLASS ...
17:08:25.518 TEST-WNDPROC: registering API SHGetSpecialFolderLocation ...
17:08:25.518 TEST-WNDPROC: registering API RegisterClass ...
17:08:25.518 TEST-WNDPROC: registering API DefWindowProc ...
17:08:25.519 TEST-WNDPROC: instatiating WNDCLASS (using windowProcJSCallback) ...
17:08:25.519 TEST-WNDPROC: calling API: RegisterClass ...
17:08:25.519 TEST-WNDPROC: calling API: CreateWindowEx ...
17:08:25.519 TEST-WNDPROC: windowProc: [36,0,2973696]
17:08:25.519 TEST-WNDPROC: windowProc: [129,0,2973652]
17:08:25.519 TEST-WNDPROC: windowProc: [131,0,2973728]
17:08:25.519 TEST-WNDPROC: windowProc: [1,0,2973608]
17:08:25.519 TEST-WNDPROC: instantiating pidl ...
17:08:25.519 TEST-WNDPROC: Prior to call, pidl = ctypes.long(ctypes.Int64("0"))
17:08:25.519 TEST-WNDPROC: calling API: SHGetSpecialFolderLocation ...
17:08:25.519 TEST-WNDPROC: got back: 0
17:08:25.519 TEST-WNDPROC: After the call, pidl = ctypes.long(ctypes.Int64("224974424"))
17:08:25.519 TEST-WNDPROC: instantiating pschcne ...
17:08:25.519 TEST-WNDPROC: DEBUG: [nSources=32771][lEvents=145919][uMsg=1025]
17:08:25.519 TEST-WNDPROC: calling API: SHChangeNotifyRegister ...
17:08:25.520 TEST-WNDPROC: SUCCESS: Registered with ShellService for DRIVE/MEDIA
notifications! reg-id: 15
17:08:25.520 TEST-WNDPROC: done!
----- &< -------
17:09:31.391 TEST-WNDPROC: unloading USER32.DLL ...
17:09:31.391 TEST-WNDPROC: unloading SHELL32.DLL ...
17:09:31.391 TEST-WNDPROC: done!
