Silverlight5通过P/Invoke调用系统win32的三个示例
调用Win32函数
public partial class MainPage : UserControl
{
[DllImportAttribute("user32.dll", EntryPoint = "MessageBoxW")]
public static extern int MessageBoxW(
[In]System.IntPtr hWnd,
[In][MarshalAs(UnmanagedType.LPWStr)] string lpText,
[In][MarshalAs(UnmanagedType.LPWStr)] string lpCaption,
uint uType);
[DllImport("user32.dll", EntryPoint = "MessageBoxA")]
static extern int MsgBox(int hWnd, string msg, string caption, int type);
[DllImport("kernel32.dll")]
public static extern bool Beep(int frequency, int duration);
[DllImport("learnDll.dll")]//, EntryPoint = "fnlearnDll"
public static extern int fnlearnDll();
public void PlaySound()
{
Random random = new Random();
for (int i = 0; i < 50; i++)
{
Beep(random.Next(10000), 100);
}
}
public MainPage()
{
InitializeComponent();
}
private void button1_Click(object sender, RoutedEventArgs e)
{
PlaySound();
MsgBox(0, "Hello", "Interop", 0);
//MessageBoxW(IntPtr.Zero, "Hello", "Interop", 0);
fnlearnDll();
}
}
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USB设备插取识别
public partial class SilverlightControl1 : UserControl
{
// Importing a set of necessary native methods from Win32 API.
[DllImport("User32", EntryPoint = "CreateWindowEx", CharSet = CharSet.Auto, SetLastError = true)]
static extern IntPtr CreateWindowEx(int dwExStyle, string lpszClassName, string lpszWindowName, int style, int x, int y, int width, int height,
IntPtr hWndParent, IntPtr hMenu, IntPtr hInst,
[MarshalAs(UnmanagedType.AsAny)] object pvParam);
[DllImport("user32.dll")]
static extern IntPtr DefWindowProc(IntPtr hWnd, int uMsg,
IntPtr wParam, IntPtr lParam);
[DllImport("user32", CharSet = CharSet.Auto, SetLastError = true)]
public static extern short RegisterClass(WNDCLASS wc);
// Marshaling the Window structure.
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public class WNDCLASS
{
public int style;
public WndProc lpfnWndProc;
public int cbClsExtra;
public int cbWndExtra;
public IntPtr hInstance;
public IntPtr hIcon;
public IntPtr hCursor;
public IntPtr hbrBackground;
public string lpszMenuName;
public string lpszClassName;
}
//system detects USB insertion/removal
const int WM_DEVICECHANGE = 0x0219;
// system detects a new device
const int DBT_DEVICEARRIVAL = 0x8000;
// device removed
const int DBT_DEVICEREMOVECOMPLETE = 0x8004;
// Callbacks must have AllowReversePInvokeCalls attribute.
[AllowReversePInvokeCalls]
private IntPtr Callback(IntPtr hWnd, int msg, IntPtr wparam, IntPtr lparam)
{
if (msg == WM_DEVICECHANGE)
{
if (wparam.ToInt32() == DBT_DEVICEARRIVAL)
textBlock1.Text = "USB inserted";
if (wparam.ToInt32() == DBT_DEVICEREMOVECOMPLETE)
textBlock1.Text = "USB removed";
}
return DefWindowProc(hWnd, msg, wparam, lparam);
}
public delegate IntPtr WndProc(
IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam);
// Preventing garbage collection of the delegate
private static WndProc dontGCthis;
public SilverlightControl1()
{
InitializeComponent();
WNDCLASS wc = new WNDCLASS();
// Preventing garbage collection of the delegate
dontGCthis = new WndProc(Callback);
wc.lpfnWndProc = dontGCthis;
// Note that you need to ensure unique names // for each registered class.
// For example, if you open the same plugin
// in two different tabs of the browser,
// you still should not end up with
// two registered classes with identical names.
wc.lpszClassName = "foobar" + (new Random()).Next();
RegisterClass(wc);
IntPtr createResult = CreateWindowEx(0, wc.lpszClassName, "Window title", 0, 100, 100, 500, 500, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, 0);
}
}
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进程实时管理
<UserControl
x:Class="SilverlightApplication10.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignHeight="300"
d:DesignWidth="400"
xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"
xmlns:local="clr-namespace:SilverlightApplication10">
<UserControl.DataContext>
<local:ProcessViewModel />
</UserControl.DataContext>
<Grid
x:Name="LayoutRoot"
Margin="6"
Background="White">
<Grid.RowDefinitions>
<RowDefinition
Height="Auto" />
<RowDefinition />
</Grid.RowDefinitions>
<TextBlock
Text="Process Information"
FontSize="16" />
<sdk:DataGrid
Grid.Row="1"
Margin="2"
AutoGenerateColumns="true"
ItemsSource="{Binding Processes}"/>
</Grid>
</UserControl>
public class PropertyChangeNotification : INotifyPropertyChanged
{
protected void RaisePropertyChanged(string property)
{
if (this.PropertyChanged != null)
{
this.PropertyChanged(this,
new PropertyChangedEventArgs(property));
}
}
public event PropertyChangedEventHandler PropertyChanged;
}
using System.ComponentModel;
using System.Collections.Generic;
using System.Windows;
using System.Collections.ObjectModel;
using System.Linq;
using System.Windows.Threading;
using System;
using System.Threading.Tasks;
public class ProcessViewModel : PropertyChangeNotification
{
public ProcessViewModel()
{
if (Application.Current.HasElevatedPermissions)
{
BuildInitialProcessList();
}
}
void BuildInitialProcessList()
{
this.Processes = new ObservableCollection<Process>();
BuildProcessList();
DispatcherTimer timer = new DispatcherTimer();
timer.Interval = TimeSpan.FromMilliseconds(500);
timer.Tick += (s, e) => BuildProcessList();
timer.Start();
}
void BuildProcessList()
{
IEnumerable<Process> newProcesses = Process.EnumerateCurrentList();
var newProcsOuterJoinedExisting =
from np in newProcesses
join op in this.Processes
on np.Id equals op.Id into joinGroup
from gp in joinGroup.DefaultIfEmpty()
select new { NewProcess = np, OldProcess = gp };
foreach (var item in newProcsOuterJoinedExisting.ToList())
{
if (item.OldProcess == null)
{
this.Processes.Add(item.NewProcess);
}
else
{
item.OldProcess.Refresh();
}
}
var remainingListOuterJoinedNewProcs =
from cp in this.Processes
join np in newProcesses
on cp.Id equals np.Id into joinGroup
from gp in joinGroup.DefaultIfEmpty()
select new { CurrentProcess = cp, NewProcess = gp };
foreach (var item in remainingListOuterJoinedNewProcs.ToList())
{
if (item.NewProcess == null)
{
this.Processes.Remove(item.CurrentProcess);
}
}
}
public ObservableCollection<Process> Processes
{
get
{
return (_Processes);
}
set
{
_Processes = value;
RaisePropertyChanged("Processes");
}
}
ObservableCollection<Process> _Processes;
}
using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Text;
using System.IO;
internal class Win32Exception : Exception
{
public Win32Exception(string message, int errorCode)
: base(message)
{
this.ErrorCode = errorCode;
}
public int ErrorCode { get; private set; }
}
public class Process : PropertyChangeNotification
{
[StructLayout(LayoutKind.Sequential)]
struct PROCESS_MEMORY_COUNTERS
{
public UInt32 cb;
public UInt32 PageFaultCount;
public UIntPtr PeakWorkingSetSize;
public UIntPtr WorkingSetSize;
public UIntPtr QuotaPeakPagedPoolUsage;
public UIntPtr QuotaPagedPoolUsage;
public UIntPtr QuotaPeakNonPagedPoolUsage;
public UIntPtr QuotaNonPagedPoolUsage;
public UIntPtr PagefileUsage;
public UIntPtr PeakPagefileUsage;
};
public Process(UInt32 processId)
{
this.Id = processId;
}
public UInt32 Id { get; private set; }
public UInt64 WorkingSetBytes
{
get
{
PROCESS_MEMORY_COUNTERS counters;
IntPtr handle = GetHandle();
try
{
if (!GetProcessMemoryInfo(handle, out counters,
(UInt32)Marshal.SizeOf(typeof(PROCESS_MEMORY_COUNTERS))))
{
throw new Win32Exception("Failed to get memory info",
Marshal.GetLastWin32Error());
}
}
finally
{
CloseHandle(handle);
}
return (counters.WorkingSetSize.ToUInt64());
}
}
public void Refresh()
{
this.RaisePropertyChanged("WorkingSetBytes");
}
public string ImageName
{
get
{
if (string.IsNullOrEmpty(this.imageName))
{
UInt32 capacity = 128;
StringBuilder builder = new StringBuilder((int)capacity);
IntPtr handle = GetHandle();
try
{
while (GetProcessImageFileName(handle, builder, capacity) == 0)
{
int errorCode = Marshal.GetLastWin32Error();
if (errorCode == ERROR_INSUFFICIENT_BUFFER)
{
capacity *= 2;
builder = new StringBuilder((int)capacity);
}
else
{
throw new Win32Exception("Failed to get image name", errorCode);
}
}
this.imageName = Path.GetFileName(builder.ToString());
}
finally
{
CloseHandle(handle);
}
}
return (this.imageName);
}
}
string imageName;
IntPtr GetHandle()
{
IntPtr handle = OpenProcess(PROCESS_QUERY_INFORMATION, false, this.Id);
if (handle == IntPtr.Zero)
{
throw new Win32Exception("Failed to open process",
Marshal.GetLastWin32Error());
}
return (handle);
}
static bool TryOpenProcess(UInt32 id)
{
IntPtr ptr = OpenProcess(PROCESS_QUERY_INFORMATION, false, id);
if (ptr != IntPtr.Zero)
{
CloseHandle(ptr);
}
return (ptr != IntPtr.Zero);
}
public static IEnumerable<Process> EnumerateCurrentList()
{
foreach (var processId in EnumerateProcessIds())
{
if (TryOpenProcess(processId))
{
yield return new Process(processId);
}
}
}
static IEnumerable<UInt32> EnumerateProcessIds()
{
UInt32[] processIds = new UInt32[32];
bool retry = true;
while (retry)
{
processIds = new UInt32[processIds.Length * 2];
UInt32 arraySize =
(UInt32)(Marshal.SizeOf(typeof(UInt32)) * processIds.Length);
UInt32 bytesCopied = 0;
retry = EnumProcesses(processIds, arraySize, out bytesCopied);
if (retry)
{
retry = (bytesCopied == arraySize);
}
else
{
throw new Win32Exception("Failed enumerating processes",
Marshal.GetLastWin32Error());
}
}
return (processIds);
}
[DllImport("psapi", SetLastError = true)]
static extern bool EnumProcesses(
[MarshalAs(UnmanagedType.LPArray)] [In] [Out] UInt32[] processIds,
UInt32 processIdsSizeBytes,
out UInt32 bytesCopied);
[DllImport("kernel32", SetLastError = true)]
static extern IntPtr OpenProcess(UInt32 dwAccess, bool bInheritHandle,
UInt32 dwProcessId);
[DllImport("kernel32")]
static extern bool CloseHandle(IntPtr handle);
[DllImport("psapi", SetLastError = true)]
static extern UInt32 GetProcessImageFileName(
IntPtr processHandle,
[In] [Out] StringBuilder lpImageFileName,
UInt32 bufferSizeCharacters);
[DllImport("psapi", SetLastError = true)]
static extern bool GetProcessMemoryInfo(
IntPtr processHandle,
out PROCESS_MEMORY_COUNTERS counters,
UInt32 dwSize);
static readonly UInt32 PROCESS_QUERY_INFORMATION = 0x0400;
const int ERROR_ACCESS_DENIED = 5;
const int ERROR_INVALID_PARAMETER = 87;
const int ERROR_INSUFFICIENT_BUFFER = 122;
}
