private async void OnWrite(Object sender, RoutedEventArgs e)
{
// 获取本地目录的引用
StorageFolder local = ApplicationData.Current.LocalFolder;
// 创建新文件
StorageFile newFIle = await local.CreateFileAsync("demo.dat", CreationCollisionOption.ReplaceExisting);
// 打开文件流
using(IRandomAccessStream stream = await newFIle.OpenAsync(FileAccessMode.ReadWrite))
{
// 实例化 DataWriter
DataWriter dw = new DataWriter(stream);
// 设置默认编码格式
dw.UnicodeEncoding = UnicodeEncoding.Utf8;
// 写入 bool 值
dw.WriteBoolean(true);
// 写入日期值
DateTime dt = new DateTime(2010, 8, 21);
dw.WriteDateTime(dt);
// 写入字符串
string str = "测试文本";
// 计算字符串长度
uint len = dw.MeasureString(str);
// 先写入字符串的长的
dw.WriteUInt32(len);
// 再写入字符串
dw.WriteString(str);
// 以下方法必须调用
await dw.StoreAsync();
// 解除 DataWriter 与流的关联
dw.DetachStream();
dw.Dispose();
}
MessageDialog msgDlg = new MessageDialog("保存成功。");
await msgDlg.ShowAsync();
}
/// <summary>
/// Saves the current progress state for the current dictionary
/// </summary>
public void saveState()
{
if (string.IsNullOrEmpty(mCrammerDict.StateFile))
throw new Exception("No state file available");
try
{
using (InMemoryRandomAccessStream memoryStream = new InMemoryRandomAccessStream())
{
using (DataWriter dataWriter = new DataWriter(memoryStream))
{
dataWriter.WriteInt32(mTotalWords);
dataWriter.WriteInt32(mKnownWords);
dataWriter.WriteInt32(mStart);
dataWriter.WriteInt32(mCurrentWord);
dataWriter.WriteBoolean(mNewWordsInUse);
dataWriter.WriteInt32(mInSystem);
dataWriter.WriteBoolean(mSwapSequence);
dataWriter.WriteBoolean(mReachedEnd);
mNewWordsChamber.saveState(dataWriter);
mFirstChamber.saveState(dataWriter);
mSecondChamber.saveState(dataWriter);
mThirdChamber.saveState(dataWriter);
mFourthChamber.saveState(dataWriter);
mFifthChamber.saveState(dataWriter);
mCompletedChamber.saveState(dataWriter);
IBuffer stateBuffer = dataWriter.DetachBuffer();
string stateString = BinaryBufferConverter.getStringFromBuffer(stateBuffer);
mCrammerDict.setStateFile(stateString);
}
}
}
catch (Exception)
{
// Assume mismatch with chamber-size config and contents of .STA file.
// Delete it so that the dictionary will load successfully next time.
mCrammerDict.removeStateFile();
}
mRestoredState = true;
}
private async Task WriteStatus(bool state)
{
StorageFolder storageFolder = ApplicationData.Current.LocalFolder;
StorageFile file = await storageFolder.CreateFileAsync("status.txt", CreationCollisionOption.ReplaceExisting);
var stream = await file.OpenAsync(Windows.Storage.FileAccessMode.ReadWrite);
using (var outputStream = stream.GetOutputStreamAt(0))
{
using (var dataWriter = new DataWriter(outputStream))
{
dataWriter.WriteBoolean(state);
await dataWriter.StoreAsync();
await outputStream.FlushAsync();
}
}
stream.Dispose();
}