Baseline 2023
Newly available
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FileSystemSyncAccessHandle
ã¤ã³ã¿ã¼ãã§ã¤ã¹ã® read()
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read(buffer, FileSystemReadWriteOptions)
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buffer
ãã¡ã¤ã«ã®å
容ãèªã¿è¾¼ããããã¡ã¼ã表ã ArrayBuffer
ã¾ã㯠(DataView
ãªã©ã®) ArrayBufferView
ã§ããArrayBuffer
ã®å
容ãç´æ¥æä½ãããã¨ã¯ã§ããªããã¨ã«æ³¨æãã¦ãã ããããããã«ããããã¡ã¼ãç¹å®ã®ãã©ã¼ãããã§è¡¨ã Int8Array
ãªã©ã®åä»ãé
åã®ãã¡ã®ä¸ã¤ãããã㯠DataView
ã®ãªãã¸ã§ã¯ãã使ãããããç¨ãã¦ãããã¡ã¼ã®å
容ãèªã¿æ¸ããã¾ãã
FileSystemReadWriteOptions
çç¥å¯
以ä¸ã®ããããã£ãæã¤ãªãã·ã§ã³ãªãã¸ã§ã¯ãã§ãã
at
ãã¡ã¤ã«ãã©ãããèªã¿è¾¼ããã®ãã¤ãåä½ã®ãªãã»ãããè¡¨ãæ°å¤ã§ãã
ãã¡ã¤ã«ããèªã¿è¾¼ãã ãã¤ãæ°ãè¡¨ãæ°å¤ã§è§£æ±ºãã Promise
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InvalidStateError
DOMException
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ArrayBuffer
ã使ãã¾ããonmessage = async (e) => {
// ã¡ã¤ã³ã¹ã¯ãªããããã®å¦ç対象ã®ã¡ãã»ã¼ã¸ãåå¾ãã
const message = e.data;
// draft ãã¡ã¤ã«ã®ãã³ãã«ãåå¾ãã
const root = await navigator.storage.getDirectory();
const draftHandle = await root.getFileHandle("draft.txt", { create: true });
// åæå¼ã¢ã¯ã»ã¹ãã³ãã«ãåå¾ãã
const accessHandle = await draftHandle.createSyncAccessHandle();
// ãã¡ã¤ã«ã®ãµã¤ãºãåå¾ãã
const fileSize = accessHandle.getSize();
// ãã¡ã¤ã«ã®å
容ããããã¡ã¼ã«èªã¿è¾¼ã
const buffer = new DataView(new ArrayBuffer(fileSize));
const readBuffer = accessHandle.read(buffer, { at: 0 });
// ã¡ãã»ã¼ã¸ããã¡ã¤ã«ã®çµç«¯ã«æ¸ãè¾¼ã
const encoder = new TextEncoder();
const encodedMessage = encoder.encode(message);
const writeBuffer = accessHandle.write(encodedMessage, { at: readBuffer });
// 夿´ããã£ã¹ã¯ã«æ¸ãè¾¼ã
accessHandle.flush();
// å®äºãããã常㫠FileSystemSyncAccessHandle ãéãã
accessHandle.close();
};
ã¡ã¢: 仿§æ¸ã®ä»¥åã®ãã¼ã¸ã§ã³ã§ã¯ãclose()
ã»flush()
ã»getSize()
ã»truncate()
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