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

FFI definitions of windows win32 api for node-ffi

import assert from 'node:assert';
import { ucsBufferToString } from 'win32-def';
import { load } from '../../lib/winspool/index.js';
const funcName = 'GetDefaultPrinterW';
/**
 * @link https://learn.microsoft.com/en-us/windows/win32/printdocs/getdefaultprinter
 */
export async function GetDefaultPrinter(maxNameLength = 256) {
    const lib = load([funcName]);
    assert(maxNameLength > 2, 'maxNameLength must be greater than 2');
    const len = maxNameLength + 1;
    const pszBuf = Buffer.alloc(len * 2);
    const pcchBuf = Buffer.alloc(4);
    pcchBuf.writeUint32LE(len);
    const ret = await lib.GetDefaultPrinterW_Async(pszBuf, pcchBuf);
    if (!ret) {
        // throw new Error('GetDefaultPrinterW() failed. May maxNameLength be too small?')
        return null;
    }
    const pcch = pcchBuf.readUInt32LE();
    if (pcch > 0) {
        const size = pcch - 1;
        const psz = ucsBufferToString(pszBuf, size);
        return psz;
    }
    return '';
}
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