1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
public delegate void NewInstanceMessageEventHandler(object sender, object message);
public class SingleInstanceApplication
{
//win32 translation of APIs, message constants and structures
private class NativeMethods
{
[DllImport("user32.dll")]
public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
[DllImport("user32.dll")]
public static extern IntPtr SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam);
public const short WM_COPYDATA = 74;
public struct COPYDATASTRUCT
{
public int dwData;
public int cbData;
public IntPtr lpData;
}
}
//a utility window to communicate between application instances
private class SIANativeWindow : NativeWindow
{
public SIANativeWindow()
{
CreateParams cp = new CreateParams();
cp.Caption = _theInstance._id; //The window title is the same as the Id
CreateHandle(cp);
}
//The window procedure that handles notifications from new application instances
protected override void WndProc(ref Message m)
{
if (m.Msg == NativeMethods.WM_COPYDATA)
{
//convert the message LParam to the WM_COPYDATA structure
NativeMethods.COPYDATASTRUCT data = (NativeMethods.COPYDATASTRUCT)Marshal.PtrToStructure(m.LParam, typeof(NativeMethods.COPYDATASTRUCT));
object obj = null;
if (data.cbData > 0 && data.lpData != IntPtr.Zero)
{
//copy the native byte array to a .net byte array
byte[] buffer = new byte[data.cbData];
Marshal.Copy(data.lpData, buffer, 0, buffer.Length);
//deserialize the buffer to a new object
obj = Deserialize(buffer);
}
_theInstance.OnNewInstanceMessage(obj);
}
else
base.WndProc(ref m);
}
}
//Singleton
static SingleInstanceApplication _theInstance = new SingleInstanceApplication();
//this is a uniqe id used to identify the application
string _id;
//The is a named mutex used to determine if another application instance already exists
Mutex _instanceCounter;
//Is this the first instance?
bool _firstInstance;
//Utility window for communication between apps
SIANativeWindow _notifcationWindow;
private void Dispose()
{
//release the mutex handle
_instanceCounter.Close();
//and destroy the window
if (_notifcationWindow != null)
_notifcationWindow.DestroyHandle();
}
private void Init()
{
_notifcationWindow = new SIANativeWindow();
}
//returns a uniqe Id representing the application. This is basically the name of the .exe
private static string GetAppId()
{
#warning SingleInstance Handler Customisé avec un Guid
return "{107746EE-AD4B-4e7b-B209-CF7F1A93F631}";
}
//notify event handler
private void OnNewInstanceMessage(object message)
{
if (NewInstanceMessage != null)
NewInstanceMessage(this, message);
}
private SingleInstanceApplication()
{
//AUDREY
//_id = "SIA_" + GetAppId();
_id = "SIA_" + GetAppId();
_instanceCounter = new Mutex(false, _id, out _firstInstance);
}
private bool Exists
{
get
{
return !_firstInstance;
}
}
//send a notification to the already existing instance that a new instance was started
private bool NotifyPreviousInstance(object message)
{
//First, find the window of the previous instance
IntPtr handle = NativeMethods.FindWindow(null, _id);
if (handle != IntPtr.Zero)
{
//create a GCHandle to hold the serialized object.
GCHandle bufferHandle = new GCHandle();
try
{
byte[] buffer;
NativeMethods.COPYDATASTRUCT data = new NativeMethods.COPYDATASTRUCT();
if (message != null)
{
//serialize the object into a byte array
buffer = Serialize(message);
//pin the byte array in memory
bufferHandle = GCHandle.Alloc(buffer, GCHandleType.Pinned);
data.dwData = 0;
data.cbData = buffer.Length;
//get the address of the pinned buffer
data.lpData = bufferHandle.AddrOfPinnedObject();
}
GCHandle dataHandle = GCHandle.Alloc(data, GCHandleType.Pinned);
try
{
NativeMethods.SendMessage(handle, NativeMethods.WM_COPYDATA, IntPtr.Zero, dataHandle.AddrOfPinnedObject());
return true;
}
finally
{
dataHandle.Free();
}
}
finally
{
if (bufferHandle.IsAllocated)
bufferHandle.Free();
}
}
return false;
}
//2 utility methods for object serialization\deserialization
private static object Deserialize(byte[] buffer)
{
using (MemoryStream stream = new MemoryStream(buffer))
{
return new BinaryFormatter().Deserialize(stream);
}
}
private static byte[] Serialize(Object obj)
{
using (MemoryStream stream = new MemoryStream())
{
new BinaryFormatter().Serialize(stream, obj);
return stream.ToArray();
}
}
public static bool AlreadyExists
{
get
{
return _theInstance.Exists;
}
}
public static bool NotifyExistingInstance(object message)
{
if (_theInstance.Exists)
{
return _theInstance.NotifyPreviousInstance(message);
}
return false;
}
public static bool NotifyExistingInstance()
{
return NotifyExistingInstance(null);
}
public static void Initialize()
{
_theInstance.Init();
}
public static void Close()
{
_theInstance.Dispose();
}
public static event NewInstanceMessageEventHandler NewInstanceMessage;
} |
ouvrir mon application en cours si on essaie de la lancer une seconde fois
Répondre avec citation
Envoyé par AP
Partager