refactor(win32-api): merge files into index.winspool.ts

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

@@ -1,7 +1,12 @@
+// eslint-disable-next-line import/no-extraneous-dependencies
+import ref from 'ref-napi'
+
 import { DllNames } from '../../index.js'
 import { Winspool as DLL } from '../../index.promise.js'
 
 
+export { ref }
+
 export const dllName = DllNames.winspool
 export type Win32Fns = DLL.Win32Fns
 

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

@@ -1,4 +1,55 @@
+import assert from 'node:assert'
 
-export * from './GetDefaultPrinter.js'
-export * from './OpenPrinter.js'
+import { getMod } from '../func.helper.js'
+
+import { Win32Fns, dllName, ref } from './helper.js'
+
+
+/**
+ * Retrieves the printer name of the default printer for the current user on the local computer.
+ * @docs https://docs.microsoft.com/en-us/windows/win32/printdocs/getdefaultprinter
+ */
+export async function winspoolGetDefaultPrinter(maxNameLength = 256): Promise<string | undefined> {
+  const mod = getMod<Win32Fns>(dllName)
+
+  assert(maxNameLength > 2)
+
+  const len = maxNameLength + 1
+
+  const pszBuf = Buffer.alloc(len * 2)
+  const pcchBuf = Buffer.alloc(4)
+  pcchBuf.writeUint32LE(len)
+
+  const ret = await mod.GetDefaultPrinterW(pszBuf, pcchBuf)
+  if (! ret) {
+    return
+  }
+
+  const pcch = pcchBuf.readUInt32LE()
+  if (pcch > 0) {
+    const size = pcch - 1
+    const psz = pszBuf.toString('ucs2', 0, size * 2).replace(/\0+$/u, '')
+    return psz
+  }
+}
+
+
+/**
+ * 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 winspoolOpenPrinter(printerName: string): Promise<M.HANDLE | undefined> {
+  const mod = getMod<Win32Fns>(dllName)
+
+  assert(printerName)
+
+  const nameBuf = Buffer.from(printerName + '\0', 'ucs2')
+  const ptr = Buffer.alloc(8)
+  const ret = await mod.OpenPrinterW(nameBuf, ptr, ref.NULL)
+  if (ret) {
+    const hWnd = ptr.readBigInt64LE()
+    return hWnd
+  }
+}