1

我是一名 C++ 开发人员，最近开始研究 WPF。我正在研究一系列组合框和一个按钮。这是代码：

XAML：

<GroupBox Header="EEPROM Version Strings" Grid.Column="1" Height="Auto" HorizontalAlignment="Stretch" Margin="10,0,10,0" Name="groupBox1" VerticalAlignment="Stretch" Width="Auto">
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition />
                    <RowDefinition />
                    <RowDefinition />
                    <RowDefinition />
                    <RowDefinition />
                </Grid.RowDefinitions>
                <Button Content="Write EEPROM" Command="{Binding WriteEEPROMCommand}" Grid.Row="4" Height="23" HorizontalAlignment="Center" Margin="0,0,0,0" Name="WriteEEPROMVersionStrings" VerticalAlignment="Center" Width="116" />
                <ComboBox Height="23" ItemsSource="{Binding I2CAddressList}" SelectedItem="{Binding SelectedI2CAddressList, Mode=TwoWay}" SelectedIndex="0" Grid.Row="0" HorizontalAlignment="Center" Margin="0,0,0,0" Name="comboBox1" VerticalAlignment="Center" Width="200" />
                <ComboBox Height="23" ItemsSource="{Binding BoardBoxList}" SelectedItem="{Binding SelectedBoardBoxList, Mode=TwoWay}" SelectedIndex="0" Grid.Row="1" HorizontalAlignment="Center" Margin="0,0,0,0" Name="comboBox2" VerticalAlignment="Center" Width="200" />
                <ComboBox Height="23" ItemsSource="{Binding VersionBoxList}" SelectedItem="{Binding SelectedVersionBoxList, Mode=TwoWay}" SelectedIndex="0" Grid.Row="2" HorizontalAlignment="Center" Margin="0,0,0,0" Name="comboBox3" VerticalAlignment="Center" Width="200" />
                <ComboBox Height="23" ItemsSource="{Binding SerialBoxList}" SelectedItem="{Binding SelectedSerialBoxList, Mode=TwoWay}" SelectedIndex="0" Grid.Row="3" HorizontalAlignment="Center" Margin="0,0,0,0" Name="comboBox4" VerticalAlignment="Center" Width="200" />
            </Grid>                    
        </GroupBox>

由于我使用的是 MVVM，这是我的 ViewModel 类：

Byte[] sendBuf = new Byte[256];
    Byte[] readBuf = new Byte[256];       

    public ObservableCollection<string> _I2CAddressList;
    public ObservableCollection<string> _BoardBoxList;
    public ObservableCollection<string> _VersionBoxList;
    public ObservableCollection<string> _SerialBoxList;

在构造函数中：

var myboard = new[]
        {      
               "",
               "S1010012",   // redhook
               "S1010018",   // bavaria
               "S1010020"    // flying dog
        };

        var myVariant = new[]
        { 
               "",    
               "001A",
               "001B",
               "001C",
               "002A",
               "002B",
               "002C",
               "003A",
               "003B",
               "003C",
        };      

        _I2CAddressList = new ObservableCollection<string>();
        _BoardBoxList = new ObservableCollection<string>(myboard);
        _VersionBoxList = new ObservableCollection<string>(myVariant);
        _SerialBoxList = new ObservableCollection<string>();

        for (int i = 1; i < 200; i++)
        {
            _SerialBoxList.Add(i.ToString());
        }

        //List of I2C Address
        _I2CAddressList.Add("0x50");
        _I2CAddressList.Add("0x53");

        this.SelectedI2CAddressList = this._I2CAddressList[1];
        this.SelectedBoardBoxList = this.BoardBoxList[2];
        this.SelectedVersionBoxList = this.VersionBoxList[2];
        this.SelectedSerialBoxList = this.SerialBoxList[0];

这是组合框和按钮属性：

public ObservableCollection<string> I2CAddressList
    {
        get { return _I2CAddressList; }
        set
        {
            _I2CAddressList = value;
            OnPropertyChanged("I2CAddressList");
        }
    }

    private string _SelectedI2CAddressList;
    public string SelectedI2CAddressList
    {
        get { return _SelectedI2CAddressList; }
        set
        {
            _SelectedI2CAddressList = value;
            OnPropertyChanged("SelectedI2CAddressList");
        }
    }        

    // Similar property for other comboboxes

    private ICommand mWriteEEPROMCommand;
    public ICommand WriteEEPROMCommand
    {
        get
        {
            if (mWriteEEPROMCommand == null)
                mWriteEEPROMCommand = new DelegateCommand(new Action(mWriteEEPROMCommandExecuted), new Func<bool>(mWriteEEPROMCommandCanExecute));

            return mWriteEEPROMCommand;
        }
        set
        {
            mWriteEEPROMCommand = value;
        }
    }

    public bool mWriteEEPROMCommandCanExecute()
    {
        return true;
    }

    char[] version = 
        {
                'A', 'U', 'D', 'I', 'E', 'N', 'C', 'E',         // name
                '0', '0', '0', '0', '0', '0', '0', '0' ,        // reserved,  firmware size
                '0', '0', '0', '0', '0', '0', '0', '0' ,        // board number
                '0', '0', '0', '0', '0', '0', '0', '0' ,        // variant, version, serial
                '0', '0', '0', '0', '0', '0', '0', '0'          // date code, reserved
        };               

    public void mWriteEEPROMCommandExecuted()
    {
        int temp, memloc = 0;
        int cmd = 0x0A53;

        // fill in the I2C address
        if ((I2CAddressList.IndexOf(_SelectedI2CAddressList) + 1) == 1)
        {
            cmd = 0x0A50;
        }

        // fill in the address to write to -- 0
        sendBuf[memloc++] = 0;
        sendBuf[memloc++] = 0;   

        // fill in the audience header
        for (int i = 0; i < 8; i++)
        {
            sendBuf[i + memloc] = Convert.ToByte(version[i]);       // the first 8 bytes
        }               
        memloc += 16;                                               // the 8 copied, plus 8 reserved bytes

        temp = (BoardBoxList.IndexOf(_SelectedBoardBoxList) + 1);
        if (temp >= 1 && temp <= 3) 
        {
            // How to perform the memory operation here
        }

        memloc += 8;            // move regardless if this was set
    }

我无法弄清楚如何在myboard. 虽然我能够做到这一点version。这就是我在 C++ 代码中所做的

sendBuf[memloc++] = 0;
    sendBuf[memloc++] = 0;

    // fill in the audience header
    memcpy(sendBuf+memloc, version, 8); // the first 8 bytes
    memloc += 16;

temp = m_boardBox->getSelectedId();
    if(temp >= 1 && temp <= 3) // a valid board selection
        memcpy(sendBuf+memloc, boards[temp], 8);
    memloc += 8;

板子是这样的：

static const signed char boards[][9] = {
{},                                           // left blank to indicate no selection
{ 'S', '1', '0', '1', '0', '0', '1', '2', 0 },   // redhook
{ 'S', '1', '0', '1', '0', '0', '1', '8', 0 },   // bavaria
{ 'S', '1', '0', '1', '0', '0', '2', '0', 0 },   // flying dog

};

因此，当我单击 WRITEEEPROM 按钮时，会执行一系列代码。我在某种程度上是成功的，但是当我遇到如何为字符串数组复制内存时，我无法解决它。我已经展示了上面的 C++ 示例 :)

我怎样才能实现它？？？

4

2 回答 2

1

在 .NET 中，System.Buffer 包含一堆用于复制缓冲区的方法。

http://msdn.microsoft.com/en-us/library/system.buffer.aspx

于 2012-10-30T08:21:18.740 回答
1

我不确定这是否是您正在寻找的东西，但无论如何我都会尝试。

字符串使用System.Text.Encoding类进行编码。此类提供使用指定编码将字符串转换为字节数组的方法：

Byte[] encodedBytes = System.Text.Encoding.ASCII.GetBytes("string");

框架本身提供了几种编码，例如 ASCII、UTF7、UTF8、Unicode 等。如果需要特殊编码，则必须使用 Encoding 作为基类自行实现。

生成的字节数组可以使用System.Buffer.

于 2012-10-30T09:41:43.103 回答