Part IV in Visual Studio .NET

Make Denso QR Bar Code in Visual Studio .NET Part IV

Part IV
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Core Facilities
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// Read and write to a field t.InvokeMember("m_someField", c_bf | BindingFlags.SetField, null, obj, new Object[] { 5 }); Int32 v = (Int32)t.InvokeMember("m_someField", c_bf | BindingFlags.GetField, null, obj, null); Console.WriteLine("someField: " + v); // Call a method String s = (String) t.InvokeMember("ToString", c_bf | BindingFlags.InvokeMethod, null, obj, null); Console.WriteLine("ToString: " + s); // Read and write a property try { t.InvokeMember("SomeProp", c_bf | BindingFlags.SetProperty, null, obj, new Object[] { 0 }); } catch (TargetInvocationException e) { if (e.InnerException.GetType() != typeof(ArgumentOutOfRangeException)) throw; Console.WriteLine("Property set catch."); } t.InvokeMember("SomeProp", c_bf | BindingFlags.SetProperty, null, obj, new Object[] { 2 }); v = (Int32)t.InvokeMember("SomeProp", c_bf | BindingFlags.GetProperty, null, obj, null); Console.WriteLine("SomeProp: " + v); // Add and remove a delegate from the event by invoking the event's add/remove methods EventHandler eh = new EventHandler(EventCallback); t.InvokeMember("add_SomeEvent", c_bf | BindingFlags.InvokeMethod, null, obj, new Object[] { eh }); t.InvokeMember("remove_SomeEvent", c_bf | BindingFlags.InvokeMethod, null, obj, new Object[] { eh });
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private static void BindToMemberThenInvokeTheMember(Type t) { Console.WriteLine("BindToMemberThenInvokeTheMember"); // Construct an instance // ConstructorInfo ctor = // t.GetConstructor(new Type[] { Type.GetType("System.Int32&") }); ConstructorInfo ctor = t.GetConstructor(new Type[] { typeof(Int32).MakeByRefType() }); Object[] args = new Object[] { 12 }; // Constructor arguments Console.WriteLine("x before constructor called: " + args[0]); Object obj = ctor.Invoke(args); Console.WriteLine("Type: " + obj.GetType().ToString()); Console.WriteLine("x after constructor returns: " + args[0]); // Read and write to a field FieldInfo fi = obj.GetType().GetField("m_someField", c_bf); fi.SetValue(obj, 33); Console.WriteLine("someField: " + fi.GetValue(obj));
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23 Assembly Loading and Reflection
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// Call a method MethodInfo mi = obj.GetType().GetMethod("ToString", c_bf); String s = (String)mi.Invoke(obj, null); Console.WriteLine("ToString: " + s); // Read and write a property PropertyInfo pi = obj.GetType().GetProperty("SomeProp", typeof(Int32)); try { pi.SetValue(obj, 0, null); } catch (TargetInvocationException e) { if (e.InnerException.GetType() != typeof(ArgumentOutOfRangeException)) throw; Console.WriteLine("Property set catch."); } pi.SetValue(obj, 2, null); Console.WriteLine("SomeProp: " + pi.GetValue(obj, null)); // Add and remove a delegate from the event EventInfo ei = obj.GetType().GetEvent("SomeEvent", c_bf); EventHandler ts = new EventHandler(EventCallback); // See ei.EventHandlerType ei.AddEventHandler(obj, ts); ei.RemoveEventHandler(obj, ts); }
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// Callback method added to the event private static void EventCallback(Object sender, EventArgs e) { }
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private static void BindToMemberCreateDelegateToMemberThenInvokeTheMember(Type t) { Console.WriteLine("BindToMemberCreateDelegateToMemberThenInvokeTheMember"); // Construct an instance (You can't create a delegate to a constructor) Object[] args = new Object[] { 12 }; // Constructor arguments Console.WriteLine("x before constructor called: " + args[0]); Object obj = Activator.CreateInstance(t, args); Console.WriteLine("Type: " + obj.GetType().ToString()); Console.WriteLine("x after constructor returns: " + args[0]); // NOTE: You can't create a delegate to a field // Call a method MethodInfo mi = obj.GetType().GetMethod("ToString", c_bf); var toString = (Func<String>) Delegate.CreateDelegate(typeof(Func<String>), obj, mi); String s = toString(); Console.WriteLine("ToString: " + s); // Read and write a property PropertyInfo pi = obj.GetType().GetProperty("SomeProp", typeof(Int32)); var setSomeProp = (Action<Int32>) Delegate.CreateDelegate(typeof(Action<Int32>), obj, pi.GetSetMethod()); try { setSomeProp(0); }
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Generate Bar Code In VS .NET
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Part IV
Printing PDF 417 In None
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Reading ECC200 In VB.NET
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Core Facilities
Printing Barcode In VB.NET
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Encode QR In Objective-C
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catch (ArgumentOutOfRangeException) { Console.WriteLine("Property set catch."); } setSomeProp(2); var getSomeProp = (Func<Int32>) Delegate.CreateDelegate(typeof(Func<Int32>), obj, pi.GetGetMethod()); Console.WriteLine("SomeProp: " + getSomeProp()); // Add and remove a delegate from the event EventInfo ei = obj.GetType().GetEvent("SomeEvent", c_bf); var addSomeEvent = (Action<EventHandler>) Delegate.CreateDelegate(typeof(Action<EventHandler>), obj, ei.GetAddMethod()); addSomeEvent(EventCallback); var removeSomeEvent = (Action<EventHandler>) Delegate.CreateDelegate(typeof(Action<EventHandler>), obj, ei.GetRemoveMethod()); removeSomeEvent(EventCallback);
private static void UseDynamicToBindAndInvokeTheMember(Type t) { Console.WriteLine("UseDynamicToBindAndInvokeTheMember"); // Construct an instance (You can't create a delegate to a constructor) Object[] args = new Object[] { 12 }; // Constructor arguments Console.WriteLine("x before constructor called: " + args[0]); dynamic obj = Activator.CreateInstance(t, args); Console.WriteLine("Type: " + obj.GetType().ToString()); Console.WriteLine("x after constructor returns: " + args[0]); // Read and write to a field try { obj.m_someField = 5; Int32 v = (Int32)obj.m_someField; Console.WriteLine("someField: " + v); } catch (RuntimeBinderException e) { // We get here because the field is private Console.WriteLine("Failed to access field: " + e.Message); } // Call a method String s = (String)obj.ToString(); Console.WriteLine("ToString: " + s); // Read and write a property try { obj.SomeProp = 0; } catch (ArgumentOutOfRangeException) { Console.WriteLine("Property set catch."); } obj.SomeProp = 2; Int32 val = (Int32)obj.SomeProp; Console.WriteLine("SomeProp: " + val);
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