feat(win32-api): fun/user32GetWindowText()

packages/win32-api/src/func/user32/helper.ts

@@ -1,7 +1,13 @@
+// eslint-disable-next-line import/no-extraneous-dependencies
+import ref from 'ref-napi'
+
 import { DllNames } from '../../index.js'
 import { User32 as DLL } from '../../index.promise.js'
 
 
+export { DModel as M } from '../../index.js'
+export { ref }
+
 export const dllName = DllNames.user32
 export type Win32Fns = DLL.Win32Fns
 

packages/win32-api/src/func/user32/index.user32.ts

@@ -1,3 +1,58 @@
+import {
+  genUcsBufferFrom,
+  ucsBufferToString,
+} from '../../index.js'
+import { getMod } from '../func.helper.js'
 
-export * from './FindWindowEx.js'
+import { Win32Fns, dllName, M } from './helper.js'
 
+
+/**
+ * Retrieves a handle to the specified printer or print server or other types of handles in the print subsystem.
+ * @docs https://docs.microsoft.com/en-us/windows/win32/printdocs/openprinter
+ * @docs https://docs.microsoft.com/zh-cn/windows/win32/printdocs/openprinter
+ */
+export async function user32FindWindowEx(
+  hwndParent: M.HWND,
+  hwndChildAfter: M.HWND,
+  lpszClass: string | null,
+  lpszWindow: string | null,
+): Promise<M.HWND | undefined> {
+
+  const mod = getMod<Win32Fns>(dllName)
+
+  const lpszClassBuf = genUcsBufferFrom(lpszClass)
+  const lpszWindowBuf = genUcsBufferFrom(lpszWindow)
+
+  const hWnd = await mod.FindWindowExW(
+    hwndParent,
+    hwndChildAfter,
+    lpszClassBuf,
+    lpszWindowBuf,
+  )
+
+  const ret = hWnd ? hWnd : undefined
+  return ret
+}
+
+
+/**
+ * @docs https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-getwindowtextw
+ */
+export async function user32GetWindowText(
+  hWnd: M.HWND,
+  nMaxCount: M.INT,
+): Promise<string> {
+
+  const mod = getMod<Win32Fns>(dllName)
+
+  const len = nMaxCount
+  const buf = Buffer.alloc(len * 2)
+
+  const ret = await mod.GetWindowTextW(hWnd, buf, len)
+  if (ret > 0) {
+    const str = ucsBufferToString(buf)
+    return str
+  }
+  return ''
+}

packages/win32-api/src/func/winspool/helper.ts

@@ -5,6 +5,7 @@ import { DllNames } from '../../index.js'
 import { Winspool as DLL } from '../../index.promise.js'
 
 
+export { DModel as M } from '../../index.js'
 export { ref }
 
 export const dllName = DllNames.winspool

packages/win32-api/src/func/winspool/index.winspool.ts

@@ -2,7 +2,7 @@ import assert from 'node:assert'
 
 import { getMod } from '../func.helper.js'
 
-import { Win32Fns, dllName, ref } from './helper.js'
+import { Win32Fns, dllName, M, ref } from './helper.js'
 
 
 /**

packages/win32-api/test/70.user32.test.ts

@@ -5,7 +5,10 @@ import { fileShortPath } from '@waiting/shared-core'
 import ffi from 'ffi-napi'
 import { sleep } from 'zx'
 
-import { user32FindWindowEx } from '../src/index.fun.js'
+import {
+  user32FindWindowEx,
+  user32GetWindowText,
+} from '../src/index.fun.js'
 import {
   DModel as M,
   DTypes as W,
@@ -41,12 +44,9 @@ describe(fileShortPath(import.meta.url), () => {
 
       const len = title.length + 1
       assert(len > 0)
-      const buf = Buffer.alloc(len * 2)
-      let str = ''
 
-      await user32.GetWindowTextW(hWnd, buf, len)
-      str = buf.toString('ucs2').replace(/\0+$/, '')
-      assert(str === title, `title should be changed to ${title}, bug got ${str}`)
+      const text = await user32GetWindowText(hWnd, len)
+      assert(text && text === title, `title should be changed to ${title}, bug got ${text ?? 'n/a'}`)
 
       const point = StructFactory<M.POINT>(DS.POINT)
       point.x = 101