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POabout exporting function methods from .net dll (C#)
 

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  1. POabout exporting function methods from .net dll (C#)
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    <p><strong>math.dll</strong></p> <pre><code>namespace math { public class MyClass { public static int Add(int x, int y) { return x+y; } } </code></pre> <p>And in my exe project I want to use Add() function so,</p> <p><b>Example 1 - This is working</b></p> <pre><code> public void Example_1() { SampleAssembly = Assembly.Load("math"); Type type = SampleAssembly.GetType("math.MyClass"); MethodInfo methodInfo = type.GetMethod("Add"); if(methodInfo != null) { object result = null; ParameterInfo[] parameters = methodInfo.GetParameters(); object classInstance = Activator.CreateInstance(type, null); object[] parametersArray = new object[] { 3, 5 }; result = methodInfo.Invoke(classInstance, parametersArray); MessageBox.Show(result.ToString()); } } </code></pre> <p><b>Example 2 - This is not working</b></p> <pre><code>public delegate int Add(int x,int y); public void Example_2() { SampleAssembly = Assembly.Load("math"); Type type = SampleAssembly.GetType("math.MyClass"); MethodInfo methodInfo = type.GetMethod("Add"); if(methodInfo != null) { Add add = (Add)Marshal.GetDelegateForFunctionPointer (methodInfo.MethodHandle.GetFunctionPointer(),typeof(Add)); MessageBox.Show(add(3,2).ToString()); } } </code></pre> <p><b>Example 3 - This is not working</b></p> <pre><code>public void Example_3() { IntPtr hdl = LoadLibrary("math.dll"); IntPtr addr = GetProcAddress(hdl,"MyClass"); IntPtr myfunction = GetProcAddress(addr,"Add"); Add add= (Add)Marshal.GetDelegateForFunctionPointer(hdl,typeof(Add)); MessageBox.Show(add(2,3).ToString()); } </code></pre> <p><strong>Can you tell me where is the mistakes of not working examples(2,3)? Thanks.</strong></p>
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      1. POabout exporting function methods from .net dll (C#)
      1. USRobert Giesecke
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    1. COAre you trying to understand the mechanics of assemblies and methods? Or are you simply trying to use a method in an external assembly? If the latter, simply add an assembly reference to your project and instantiate the class directly. You don't need to code any of these.
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      1. USScottTx
    2. COYes I know that is the easiest way to add reference. as you say, I want to understand assemblies and exporting methods.thanks for advice.
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