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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Runtime.CompilerServices;
using System.Reflection;
using System.Reflection.Emit;
using System.Runtime.InteropServices;
using System.Threading;
public class Program
{
public static class NativeMethods
{
[DllImport("NativeCallableDll")]
public static extern int CallManagedAdd(IntPtr callbackProc, int n);
}
private delegate int IntNativeMethodInvoker();
private delegate void NativeMethodInvoker();
public static int Main()
{
int ret;
//NegativeTest_NonBlittable();
ret = TestNativeCallableValid();
if (ret != 100)
return ret;
//NegativeTest_ViaDelegate();
//NegativeTest_ViaLdftn();
return 100;
}
public static int TestNativeCallableValid()
{
/*
void TestNativeCallable()
{
.locals init ([0] native int ptr)
IL_0000: nop
IL_0002: ldftn int32 CallbackMethod(int32)
IL_0012: stloc.0
IL_0013: ldloc.0
IL_0014: ldc.i4 100
IL_0019: call bool NativeMethods::CallNativeAdd(native int, int)
IL_001e: pop
IL_001f: ret
}
*/
DynamicMethod testNativeCallable = new DynamicMethod("TestNativeCallable", typeof(int), null, typeof(Program).Module);
ILGenerator il = testNativeCallable.GetILGenerator();
il.DeclareLocal(typeof(IntPtr));
il.Emit(OpCodes.Nop);
// Get native function pointer of the callback
il.Emit(OpCodes.Ldftn, typeof(Program).GetMethod("ManagedAddCallback"));
il.Emit(OpCodes.Stloc_0);
il.Emit(OpCodes.Ldloc_0);
// return 111+100
il.Emit(OpCodes.Ldc_I4, 111);
il.Emit(OpCodes.Call, typeof(NativeMethods).GetMethod("CallManagedAdd"));
il.Emit(OpCodes.Ret);
IntNativeMethodInvoker testNativeMethod = (IntNativeMethodInvoker)testNativeCallable.CreateDelegate(typeof(IntNativeMethodInvoker));
if (testNativeMethod() != 211)
return 0;
return 100;
}
public static void NegativeTest_ViaDelegate()
{
// Try invoking method directly
try
{
Func<int, int> invoker = ManagedAddCallback;
invoker(0);
}
catch (Exception)
{
}
}
public static void NegativeTest_NonBlittable()
{
// Try invoking method directly
try
{
Func<bool, int> invoker = CallbackMethodNonBlitabble;
invoker(true);
}
catch (Exception)
{
Console.WriteLine(":bla");
}
}
public static void NegativeTest_ViaLdftn()
{
/*
.locals init (native int V_0)
IL_0000: nop
IL_0001: ldftn void ConsoleApplication1.Program::callback(int32)
IL_0007: stloc.0
IL_0008: ldc.i4.s 12
IL_000a: ldloc.0
IL_000b: calli void(int32)
IL_0010: nop
IL_0011: ret
*/
DynamicMethod testNativeCallable = new DynamicMethod("TestNativeCallableLdftn", null, null, typeof(Program).Module);
ILGenerator il = testNativeCallable.GetILGenerator();
il.DeclareLocal(typeof(IntPtr));
il.Emit(OpCodes.Nop);
il.Emit(OpCodes.Ldftn, typeof(Program).GetMethod("LdftnCallback"));
il.Emit(OpCodes.Stloc_0);
il.Emit(OpCodes.Ldc_I4,12);
il.Emit(OpCodes.Ldloc_0);
SignatureHelper sig = SignatureHelper.GetMethodSigHelper(typeof(Program).Module, null, new Type[] { typeof(int) });
sig.AddArgument(typeof(int));
// il.EmitCalli is not available and the below is not correct
il.Emit(OpCodes.Calli,sig);
il.Emit(OpCodes.Nop);
il.Emit(OpCodes.Ret);
NativeMethodInvoker testNativeMethod = (NativeMethodInvoker)testNativeCallable.CreateDelegate(typeof(NativeMethodInvoker));
testNativeMethod();
}
#region callbacks
[NativeCallable]
public static void LdftnCallback(int val)
{
}
[NativeCallable]
public static int ManagedAddCallback(int n)
{
return n + 100;
}
[NativeCallable]
public static int CallbackMethodGeneric<T>(IntPtr hWnd, IntPtr lParam)
{
return 1;
}
[NativeCallable]
public static int CallbackMethodNonBlitabble(bool x1)
{
return 1;
}
#endregion //callbacks
}
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