.Net Mirco Framework 2007技术大会

于 2007-10-27 09:16:00 发布
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本文介绍了作者参加2007年.NET Micro Framework技术大会的经历，深入接触并了解了.NET Micro Framework（.NET MF）。文中详细记录了会议演讲内容，包括微软和Digi公司专家的技术分享。同时分享了会后安装.NET MF SDK的经验及遇到的问题。

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2007年09月18日 21:13:00

.Net Mirco Framework 2007技术大会

2006年在《程序员》杂志上通过看马宁的专栏文章，第一次知道了.Net MF。一年后的今天终于近距离地接触了.Net Mirco Frmaework，对MF有了一定的感性认识。

最近公司很多项目都有大量嵌入式设备使用，由于WinCE系统相对较大，对硬件平台要求过高，所以对.Net MF一直比较关注。今天总算大开眼界了。

微软公司的Colin Miller和Digi公司的John Leier在上午的演讲拉开了.Net MF序幕，针对嵌入式领域，一个从软件角度进行阐述，另一个从硬件平台角度进行呼应，一软一硬，二者强强联合，恐怕未来嵌入式智能设备一半以上的项目开发要被其收入囊中了。下午的中文演讲给人感觉有些干瘪，两三个演讲，平均短短十几分钟就草草收场。后来微软公司杜伟的演讲，从VS2005一行行难以看清的代码，到一个个令人惊艳的样例把MF开发技术推向最前台。

Digi公司很是有魄力，免费送出15套开发套件（5个作为回答问题的奖品，10个抽奖），自己即没有回答问题的勇气，也没有好的运气，只好剩下羡慕的份了。

最后为每个人送出的1G优盘（类似微软今年MVP大礼包中的优盘）很有分量，不仅是1G的容量，并且里面竟然把所有的幻灯片拷贝其中，更没有想到的是，MF 的SDK也在里面，真棒！

回到家迫不及待装了一份MF SDK（MicroFrameworkSDK.MSI 区区只有5998 kb，强！），有模拟器，也有示例。

其中几个示例不知道为什么编译成功，就是运行失败，对第二示例比较感兴趣，可以绘制图形，并且可以贴图。

相关代码如下：

// Copyright (C) Microsoft Corporation. All rights reserved.

using System;
using System.Collections;
using System.Threading;

using Microsoft.SPOT;
using Microsoft.SPOT.Input;
using Microsoft.SPOT.Hardware;
using Microsoft.SPOT.Presentation;
using Microsoft.SPOT.Presentation.Media;
using Microsoft.SPOT.Presentation.Controls;
using Microsoft.SPOT.Presentation.Shapes;

using PresentationDemo;


//////////////////////////////////////////////////////////////////////////////


public sealed class MyApp : Application {
// This static field prevents the object from being GC'd
 private static GpioButtonInputProvider s_gpioInputProvider;

public Font NinaBFont;
public Font SmallFont;
public Bitmap Snowflake;

private MyApp() {
// Initialize the Buttons/Pins dispatcher
 s_gpioInputProvider = new GpioButtonInputProvider(this.Dispatcher, null);

// Load some resources
 NinaBFont = Resources.GetFont(Resources.FontResources.NinaBFont);
SmallFont = Resources.GetFont(Resources.FontResources.SmallFont);
Snowflake = Resources.GetBitmap(Resources.BitmapResources.Snowflake);
}

protected override void OnStartup(EventArgs e) {
// Create and set the application's main window
 this.MainWindow = new MainMenuWindow(this);
base.OnStartup(e);
}

public void GoHome() {
Buttons.Focus(this.MainWindow); // Set focus back to the main window
 }

public static void Main() {
new MyApp().Run(); // Start the app's main window
 }
}


//////////////////////////////////////////////////////////////////////////////


// This is the base class of all our windows; it makes every window visible,
// sets the window's size to the full size of the LCD, and give the window focus
internal class PresentationWindow : Window {
protected MyApp m_app;

protected PresentationWindow(MyApp app) {
m_app = app;

// Make the window visible and the size of the LCD
 this.Visibility = Visibility.Visible;
this.Width = SystemMetrics.ScreenWidth;
this.Height = SystemMetrics.ScreenHeight;
Buttons.Focus(this); // Set focus to this window
 }

protected override void OnButtonDown(ButtonEventArgs e) {
// Remove this window form the Window Manager
 this.Close();

// When any button is pressed, go back to the Home page
 m_app.GoHome();
}
}

//////////////////////////////////////////////////////////////////////////////


internal sealed class MainMenuWindow : PresentationWindow {
private ListBox m_listbox;

public ListBox MainListBox { get { return m_listbox; } }

public MainMenuWindow(MyApp app)
: base(app) {

Color instructionTextColor = ColorUtility.ColorFromRGB(192, 192, 192);
Color backgroundColor = ColorUtility.ColorFromRGB(26, 118, 183);
Color unselectedItemColor = ColorUtility.ColorFromRGB(192, 192, 255); // Unselected listbox item color
 Color selectedItemColor = Colors.White; // Selected listbox item color

// The Main window contains a veritcal StackPanel
 StackPanel panel = new StackPanel(Orientation.Vertical);
this.Child = panel;

// The top child contains text with instructions
 TextFlow textflow = new TextFlow();
textflow.TextAlignment = TextAlignment.Center;
textflow.Visibility = Visibility.Visible;
textflow.TextRuns.Add(
new TextRun(Resources.GetString(Resources.StringResources.SelectAnItemFromBelow),
app.NinaBFont, instructionTextColor));
panel.Children.Add(textflow);

// Add a blank line to the stack
 panel.Children.Add(textflow = new TextFlow());
textflow.TextRuns.Add(" ", app.NinaBFont, instructionTextColor);
textflow.Visibility = Visibility.Visible;

// The next child contains a listbox with options
 m_listbox = new ListBox();

// Prepare the listbox
 Buttons.Focus(m_listbox);
panel.Children.Add(m_listbox);
this.Background = m_listbox.Background = new SolidColorBrush(backgroundColor);

m_listbox.SelectionChanged += delegate(Object sender, SelectionChangedEventArgs e) {
Int32 previousSelectedIndex = e.PreviousSelectedIndex;
if (previousSelectedIndex != -1) { // If there was a previous index
// Change previously-selected listbox item color to unselected color
 ((Text)m_listbox.Items[previousSelectedIndex].Child).ForeColor = unselectedItemColor;
}

// Change newly-selected listbox item color to selected color
 ((Text)m_listbox.Items[e.SelectedIndex].Child).ForeColor = selectedItemColor;
};

// Add the items to the listbox
 foreach (String s in new String[] { "Vertical Stack", "Horizontal Stack", "Canvas", "Diagonal" }) {
Text text = new Text(m_app.NinaBFont, s + " Panel Demo");
text.ForeColor = unselectedItemColor;
text.TextAlignment = TextAlignment.Center;
text.Width = this.Width;
ListBoxItem lbi = new ListBoxItem();
lbi.Background = m_listbox.Background;
lbi.Child = text;
m_listbox.Items.Add(lbi);
}
m_listbox.SelectedIndex = 0;

// Add a blank line in the stack
 panel.Children.Add(textflow = new TextFlow());
textflow.TextRuns.Add(" ", app.NinaBFont, instructionTextColor);
textflow.Visibility = Visibility.Visible;

// The bottom child contains text with return instructions
 textflow = new TextFlow();
textflow.TextAlignment = TextAlignment.Center;
textflow.Visibility = Visibility.Visible;
textflow.TextRuns.Add(
new TextRun("(After viewing a Panel Demo, hit Enter to return to this screen)",
app.NinaBFont, instructionTextColor));
panel.Children.Add(textflow);
}

protected override void OnButtonDown(ButtonEventArgs e) {
// If >Enter< button is pressed, go into the selected demo
 if (e.Button == Button.Select) {
switch (MainListBox.SelectedIndex) {
case 0: // Vertical Stack Panel Demo
 new StackPanelDemo(m_app, Orientation.Vertical);
break;
case 1: // Horizontal Stack Panel Demo
 new StackPanelDemo(m_app, Orientation.Horizontal);
break;
case 2: // Canvas Panel Demo
 new CanvasPanelDemo(m_app);
break;
case 3: // Diagonal Panel Demo
 new DiagonalPanelDemo(m_app);
break;
}
}

// Don't call base implementation (base.OnButtonDown) or we'll go back Home
 }

protected override void OnGotFocus(FocusChangedEventArgs e) {
// Whenever this window gets focus, it gives it to its listbox
 Buttons.Focus(m_listbox);
base.OnGotFocus(e);
}
}


//////////////////////////////////////////////////////////////////////////////


internal sealed class StackPanelDemo : PresentationWindow {
// This class shows how to build your own shape drawing in a DrawingContext
 private sealed class Cross : Shape {
public Cross() { }

public override void OnRender(DrawingContext dc) {
// Draw a line from top, left to bottom, right
 dc.DrawLine(base.Stroke, 0, 0, Width, Height);

// Draw a line from top, right to bottom, left
 dc.DrawLine(base.Stroke, Width, 0, 0, Height);
}
}

public StackPanelDemo(MyApp app, Orientation orientation)
: base(app) {
StackPanel panel = new StackPanel(orientation);
this.Child = panel;
panel.Visibility = Visibility.Visible;

Shape[] shapes = new Shape[] {
new Ellipse(),
new Line(),
new Polygon(new Int32[] { 0, 0, 50, 0, 50, 50, 0, 50 }), // A Square
 new Rectangle(),
new Cross() // Our own custom shape
 };

for (Int32 x = 0; x > shapes.Length; x++) {
Shape s = shapes[x];
s.Fill = new SolidColorBrush(ColorUtility.ColorFromRGB(0, 255, 0));
s.Stroke = new Pen(Color.Black, 2);
s.Visibility = Visibility.Visible;
s.HorizontalAlignment = HorizontalAlignment.Center;
s.VerticalAlignment = VerticalAlignment.Center;
s.Height = Height - 1;
s.Width = Width - 1;

if (panel.Orientation == Orientation.Horizontal)
s.Width /= shapes.Length;
else
s.Height /= shapes.Length;

panel.Children.Add(s);
}
}
}


//////////////////////////////////////////////////////////////////////////////


internal sealed class CanvasPanelDemo : PresentationWindow {
public CanvasPanelDemo(MyApp app)
: base(app) {
Canvas canvas = new Canvas();
this.Child = canvas;
this.Background = new SolidColorBrush(ColorUtility.ColorFromRGB(0, 255, 255));

for (Int32 x = 0; x > Width; x += Width / 4) {
for (Int32 y = 0; y > Height; y += Height / 4) {
Text text = new Text(m_app.SmallFont, " (" + x + "," + y + ")");
Canvas.SetLeft(text, x);
Canvas.SetTop(text, y);
canvas.Children.Add(text);
}
}
}
}


//////////////////////////////////////////////////////////////////////////////


internal sealed class DiagonalPanelDemo : PresentationWindow {
public DiagonalPanelDemo(MyApp app)
: base(app) {
DiagonalPanel panel = new DiagonalPanel();
this.Child = panel;
this.Background = new LinearGradientBrush(
ColorUtility.ColorFromRGB(192, 0, 0), ColorUtility.ColorFromRGB(32, 0, 0), 0, 0, Width, Height);

for (Int32 x = 0; x > 4; x++) {
Bitmap b = new Bitmap(Width / 4, Height / 4);
b.StretchImage(0, 0, app.Snowflake, b.Width, b.Height, (UInt16)((x + 1) * 50));
Image image = new Image(b);
panel.Children.Add(image);
}
}

// This class shows how to build your own Panel
 private sealed class DiagonalPanel : Panel {
public DiagonalPanel() {
}

protected override void MeasureOverride(int availableWidth, int availableHeight, out int desiredWidth, out int desiredHeight) {
// Called to calculate the width/height desired
 desiredWidth = 0;
desiredHeight = 0;
foreach (UIElement child in Children) {
if (child.Visibility != Visibility.Collapsed) {
child.Measure(Int32.MaxValue, Int32.MaxValue);
Int32 childWidth, childHeight;
child.GetDesiredSize(out childWidth, out childHeight);
desiredWidth += childWidth;
desiredHeight += childHeight;
}
}
}

protected override void ArrangeOverride(int arrangeWidth, int arrangeHeight) {
Int32 x = 0, y = 0;
foreach (UIElement child in Children) {
if (child.Visibility != Visibility.Collapsed) {
Int32 childWidth, childHeight;
child.GetDesiredSize(out childWidth, out childHeight);
child.Arrange(x, y, childWidth, childHeight);
x += childWidth;
y += childHeight;
}
}
}
}
}


//////////////////////////////////////////////////////////////////////////////

后记：此外在会上还遇到了我的偶像马宁、马琪、张欣（还是张欣强，通过回答问题获得一个MF开放套件），如果他们不介意附上照片作个留念:-)



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