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win32-api
FFI Definitions of Windows win32 api for node-ffi-napi
Initialization
npm run repo:init
Packages
Package | Version | Dependencies | DevDependencies |
---|---|---|---|
win32-api |
|||
win32-def |
What can I do with this?
Calling win32 native functions come from user32.dll, kernel32.dll, comctl32.dll by Node.js via node-ffi-napi
Installing
npm install win32-api
Usage
Find window and set window title
// **Find calc's hWnd, need running a calculator program manually at first**
/**
* exposed modules:
* C, Comctl32 for Comctl32 from lib/comctl32/api
* K, Kernel32 for kernel32 from lib/kernel32/api
* U, User32 for user32 from lib/user32/api
*/
import { K, U } from 'win32-api'
import * as ref from 'ref-napi'
const knl32 = K.load()
const user32 = U.load() // load all apis defined in lib/{dll}/api from user32.dll
// const user32 = U.load(['FindWindowExW']) // load only one api defined in lib/{dll}/api from user32.dll
const title = 'Calculator\0' // null-terminated string
// const title = '计算器\0' // null-terminated string 字符串必须以\0即null结尾!
const lpszWindow = Buffer.from(title, 'ucs2')
const hWnd = user32.FindWindowExW(0, 0, null, lpszWindow)
if (typeof hWnd === 'number' && hWnd > 0
|| typeof hWnd === 'bigint' && hWnd > 0
|| typeof hWnd === 'string' && hWnd.length > 0
) {
console.log('buf: ', hWnd)
// Change title of the Calculator
const res = user32.SetWindowTextW(hWnd, Buffer.from('Node-Calculator\0', 'ucs2'))
if ( ! res) {
console.log('SetWindowTextW failed')
}
else {
console.log('window title changed')
}
}
Ref
import { U } from 'win32-api'
import * as ref from 'ref-napi'
// so we can all agree that a buffer with the int value written
// to it could be represented as an "int *"
const buf = Buffer.alloc(4)
buf.writeInt32LE(12345, 0)
const hex = ref.hexAddress(buf)
console.log(typeof hex)
console.log(hex) // ← '7FA89D006FD8'
buf.type = ref.types.int // @ts-ignore
// now we can dereference to get the "meaningful" value
console.log(ref.deref(buf)) // ← 12345
// use of types and windef:
import * as ref from 'ref-napi'
import { K, DTypes as W } from 'win32-api'
const knl32 = K.load()
const lpszClass = Buffer.from('guard64\0', 'ucs2')
const hInstanceBuffer = ref.alloc(W.HANDLE_PVOID)
const hInstanceAddr = ref.address(hInstanceBuffer)
knl32.GetModuleHandleExW(0, lpszClass, hInstanceAddr)
// <Buffer@0x00000094D3968EC0 00 00 a4 60 ff 7f 00 00, type: { indirection: 2, name: 'uint64*' }>
console.log(hInstanceBuffer)
console.log(hInstanceBuffer.readInt32LE(0)) // -> 1621360640 (60A40000)
console.log(hInstanceBuffer.readBigUInt64LE()) // -> 140734814748672n (7FFF60A40000)
Struct
// struct usage with ref-struct
import * as Struct from 'ref-struct'
import { DModel as M, DStruct as DS } from 'win32-api'
// https://msdn.microsoft.com/en-us/library/windows/desktop/dd162805(v=vs.85).aspx
const point: M.POINT_Struct = new Struct(DS.POINT)()
point.x = 100
point.y = 200
console.log(point)
// struct usage with ref-struct-di
import * as ref from 'ref-napi'
import * as StructDi from 'ref-struct-di'
import { DModel as M, DStruct as DS } from 'win32-api'
const Struct = StructDi(ref)
const point: M.POINT_Struct = new Struct(DS.POINT)()
point.x = 100
point.y = 200
console.log(point)
StructExt
// struct usage with ref-struct
import * as Struct from 'ref-struct-napi'
import {
DModel as M,
DStructExt,
} from 'win32-api'
// https://docs.microsoft.com/zh-cn/windows/win32/api/wingdi/ns-wingdi-display_devicew
const dd: M.DISPLAY_DEVICEW_Struct = new Struct(DStructExt.DISPLAY_DEVICEW)()
dd.cb = dd.ref().byteLength
console.log(dd)
/**
Detail in:
https://github.com/waitingsong/node-win32-api/blob/master/packages/win32-api/src/data-struct-ext/wingdi.h.ts
https://github.com/waitingsong/node-win32-api/blob/master/packages/win32-api/test/user32/60_EnumDisplayDevicesW.test.ts
*/
Async Find window and set window title
// **Find calc's hWnd, need running a calculator program manually at first**
import { U } from 'win32-api'
import * as ref from 'ref-napi'
const u32 = U.load(['FindWindowExW', 'SetWindowTextW'])
const lpszClass = Buffer.from('CalcFrame\0', 'ucs2')
u32.FindWindowExW.async(0, 0, lpszClass, null, (err, hWnd) => {
if (err) {
throw err
}
if (typeof hWnd === 'number' && hWnd > 0
|| typeof hWnd === 'bigint' && hWnd > 0
|| typeof hWnd === 'string' && hWnd.length > 0
) {
const title = 'Node-Calculator'
// Change title of the Calculator
u32.SetWindowTextW.async(hWnd, Buffer.from(title + '\0', 'ucs2'), err2 => {
if (err2) {
throw err2
}
const buf = Buffer.alloc(title.length * 2)
u32.GetWindowTextW.async(hWnd, buf, buf.byteLength, err3 => {
if (err3) {
throw err3
}
const str = buf.toString('ucs2').replace(/\0+$/, '')
if (str !== title) {
throw new Error(`title should be changed to ${title}, bug got ${str}`)
}
})
})
}
else {
throw new Error('FindWindowExW() failed')
}
})
Demo
Dependencies Troubleshooting
Compile successfully with
- Node.js v12, Python v3.7 and VS2017
- Node.js v10, Python v2.7 and VS2017
If installation of node-gyp fails: Check out node-gyp and windows-build-tools