win32-api/dist/util/winspool/EnumPrinters.js

FFI definitions of windows win32 api for node-ffi

import assert from 'node:assert';
// must use ffi from 'win32-def'
import { ffi } from 'win32-def';
import { PRINTER_INFO_X_Factory, getPRINTER_INFO_X_Ptr, } from 'win32-def/struct';
import { load } from '../../lib/winspool/index.js';
const funcName = 'EnumPrintersW';
/**
 * Enumerates available printers, print servers, domains, or print providers.
 * @link https://learn.microsoft.com/en-us/windows/win32/printdocs/enumprinters
 *
 * 枚举可用的打印机、打印服务器、域或打印提供程序
 * @link https://learn.microsoft.com/zh-cn/windows/win32/printdocs/enumprinters
 */
export async function EnumPrinters(options) {
    const level = options.Level;
    const lib = load([funcName]);
    const name = '';
    // assert(level >= 1 && level <= 5, 'level must be >= 1 and <= 5')
    const cbBuf = options.cbBuf ?? 4096;
    assert(cbBuf > 2, 'cbBuf must be > 2');
    const buf = Buffer.alloc(cbBuf);
    const pcbNeeded = Buffer.alloc(4);
    const pcReturned = Buffer.alloc(4);
    const ret = await lib.EnumPrintersW_Async(options.Flags, name, level, buf, cbBuf, pcbNeeded, pcReturned);
    assert(ret, 'EnumPrintersW() failed');
    PRINTER_INFO_X_Factory(level);
    const count = pcReturned.readUInt32LE();
    // const pcb = pcbNeeded.readUInt32LE()
    const ptr = getPRINTER_INFO_X_Ptr(level);
    const key = ptr.replace(/\s*\*/u, ''); // 'PRINTER_INFO_1' | 'PRINTER_INFO_2'
    const decodeType = `${key}[${count}]`;
    const infoArr = ffi.decode(buf, decodeType);
    return infoArr;
}
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