从asset读取文件，写文件失败？

Question

从asset读取文件，写入本地时，文件写入操作失败，报错

let assetsBuffer = FoundationContextHolder.getApplicationContext()?.resourceManager.getRawFileContentSync(inputPath);
console.log("resut " + assetsBuffer.length);

let tmpFile = fs.openSync(tmpPath,fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);
let resut = fs.writeSync(tmpFile.fd, assetsBuffer);
console.log("resut " + resut);
fs.closeSync(tmpFile);

Answer 1

原因是writeSync 中后一个参数是ArrayBuffer 类型，而第一行中的assetsBuffer参数是Uint8Array类型，需要转换：

let arrayBuffer: ArrayBuffer = new ArrayBuffer(8);
let uint8Array: Uint8Array = new Uint8Array(arrayBuffer);
let buffer: ArrayBuffer = uint8Array.buffer.slice(0);