why I can`t read the file in FileHandle? Mac OS 11 swift 5
file = try FileHandle(forReadingFrom: url)
fileQueue = DispatchQueue(label: "model.source.opt.\(url.lastPathComponent)")
var jsonData = Data()
fileQueue.sync {
if let lenthData = try? self.file.read(upToCount: 8) {
var lenth = UInt64(lenthData[0])
for i in 1 ..< lenthData.count {
lenth = lenth & (UInt64(lenthData[i] << (8 * i)))
}
print(lenth)/*print the 0*/
self.file.waitForDataInBackgroundAndNotify()
if let j = try? self.file.read(upToCount: Int(lenth)) {
jsonData = j
}
print(jsonData)/*print the 0 bytes*/
self.firstFrameOffset = try! self.file.offset()
}
}
dacheng
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