String^与InMemoryRandomAccessStream，IBuffer与DataReader，DataReader之间的转化关系

最新推荐文章于 2025-08-06 00:28:11 发布

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最新推荐文章于 2025-08-06 00:28:11 发布

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CC 4.0 BY-SA版权

文章标签： c/c++

原文链接：http://www.cnblogs.com/deagle/articles/2576531.html

本文介绍了一个使用UWP(Universal Windows Platform)进行文件读写的示例代码。该示例展示了如何从字符串创建缓冲区并从文件中读取内容到字符串的过程。通过DataWriter和DataReader类实现数据的写入和读取。

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IBuffer^ Scenario3::GetBufferFromString(String^ str)
{
    InMemoryRandomAccessStream^ memoryStream = ref new InMemoryRandomAccessStream();
    DataWriter^ dataWriter = ref new DataWriter(memoryStream);
    dataWriter->WriteString(str);
    return dataWriter->DetachBuffer();
}

void Scenario3::ReadBytesButton_Click(Object^ sender, RoutedEventArgs^ e)
{
    StorageFile^ file = rootPage->SampleFile;
    if (file != nullptr)
    {
        create_task(FileIO::ReadBufferAsync(file)).then([this, file](IBuffer^ buffer)
        {
            DataReader^ dataReader = DataReader::FromBuffer(buffer);
            String^ fileContent = dataReader->ReadString(buffer->Length);
            OutputTextBlock->Text = "The following " + buffer->Length.ToString() + " bytes of text were read from '" + file->Name + "':\n\n" + fileContent;
        });
    }
}