[英]Node-webkit WinAPI
我正在為Windows開發簡單的node-webkit應用程序(Vista,7,...),我需要使用一些WinAPI函數,特別是RegisterHotKey
和SendInput
來綁定系統范圍的熱鍵,並根據它進行擊鍵。 node-webkit沒有提供這樣的API,所以我想使用node-ffi來調用這些函數。
我是WinAPI開發的新手,所以我讀了一些MSDN手冊,但發現大多數例子都創建了窗口,消息循環,消息處理程序等等。 所以我不太了解,如何從node-webkit正確調用WinAPI,而不創建單獨的窗口?
Node-ffi教程沒有涵蓋這種情況,所以我找到了節點Windows庫,但它似乎只是通過節點實現Windows應用程序。
有沒有辦法在不創建Windows應用程序的情況下實現本機調用? 這樣做的正確方法是什么?
我編寫了一個節點腳本,使用ffi
, ref
和ref-struct
模塊在Windows上捕獲熱鍵。 我有一些問題讓他們在打包的.exe中工作,因為ffi
和ref
是本機附加組件。 有關更多信息,請參閱我之前打開的這個github問題 。
無論如何,這是代碼:
var FFI = require('ffi'),
ref = require('ref'),
Struct = require('ref-struct');
/* First, create the necessary data structures that'll be used
by our windows api calls. */
var pointStruct = Struct({
'x': 'long',
'y': 'long'
});
var msgStruct = Struct({
'hwnd': 'int32',
'message': 'int32',
'wParam': 'int32',
'lParam': 'int32',
'time': 'int32',
'pt': pointStruct
});
var msgStructPtr = ref.refType(msgStruct);
/* Second, register the functions we'd like to use by providing
their method signatures. */
var user32 = new FFI.Library('user32', {
'RegisterHotKey': [
'bool', ['int32', 'int', 'int32', 'int32']
],
'GetMessageA': [
'bool', [msgStructPtr, 'int32', 'int32', 'int32']
]
/* You may prefer to use PeekMessageA which has the same
signature as GetMessageA, but is non-blocking. I haven't
tested it, though.
});
/* Third, register your hotkeys. I wanted to control a media player,
so these keys reflect that. */
var ALT = 0x0001,
CTRL = 0x0002,
SHIFT = 0x0004;
var MEDIA_NEXT = 0xB0,
MEDIA_PREV = 0xB1,
MEDIA_STOP = 0xB2,
MEDIA_PLAY_PAUSE = 0xB3,
MEDIA_LAUNCH = 0xB5;
var PERIOD = 0xBE,
COMMA = 0xBC,
EQUAL = 0xBB,
DIVIDE = 0xBF,
SQUOTE = 0xDE,
PAGEUP = 0x21,
PAGEDOWN = 0x22;
registrations = [];
registrations.push(user32.RegisterHotKey(0, 1, 0, MEDIA_NEXT));
registrations.push(user32.RegisterHotKey(0, 1, 0, MEDIA_PREV));
registrations.push(user32.RegisterHotKey(0, 1, 0, MEDIA_STOP));
registrations.push(user32.RegisterHotKey(0, 1, 0, MEDIA_PLAY_PAUSE));
registrations.push(user32.RegisterHotKey(0, 1, 0, MEDIA_LAUNCH));
registrations.push(user32.RegisterHotKey(0, 1, CTRL, PERIOD));
registrations.push(user32.RegisterHotKey(0, 1, CTRL, COMMA));
registrations.push(user32.RegisterHotKey(0, 1, CTRL, EQUAL));
registrations.push(user32.RegisterHotKey(0, 1, CTRL, DIVIDE));
registrations.push(user32.RegisterHotKey(0, 1, CTRL | ALT, PAGEUP));
registrations.push(user32.RegisterHotKey(0, 1, CTRL | ALT, PAGEDOWN));
// an array of booleans telling us which registrations failed/succeeded
console.log(registrations);
/* Fourth, wait for new hotkey events from the message queue. */
var myMsg = new msgStruct;
while (user32.GetMessageA(myMsg.ref(), 0, 0, 0)) {
var key = myMsg.lParam >> 16;
switch (key) {
case MEDIA_NEXT: console.log('media next'); break;
case MEDIA_PREV: console.log('media prev'); break;
case MEDIA_STOP: console.log('media stop'); break;
case MEDIA_PLAY_PAUSE: console.log('media play/pause'); break;
case MEDIA_LAUNCH: console.log('media launch'); break;
case PERIOD: console.log('next'); break;
case COMMA: console.log('previous'); break;
case EQUAL: console.log('play/pause'); break;
case DIVIDE: console.log('info'); break;
case PAGEUP: console.log('volume up'); break;
case PAGEDOWN: console.log('volume down'); break;
default: console.log('undefined hotkey', key, key.toString(16));
}
}
如果您希望這與node-webkit一起使用,請確保使用nw-gyp
構建所有本機加載項,並將--target
設置為node-webkit的版本(在我的情況下為0.5.1):
# Make sure you run this command in the following directories (where the binding.gyp files are):
# node_modules/ffi/
# node_modules/ffi/node_modules/ref/
# node_modules/ref/
$ nw-gyp clean configure --target=v0.5.1 build
查看MSDN文檔以了解所使用的方法簽名和結構。 希望這可以幫助!
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