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POUsing C# COM in unmanaged C++ project -> First-chance exception at 0x7697C41F (KernelBase.dll)
 

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  1. POUsing C# COM in unmanaged C++ project -> First-chance exception at 0x7697C41F (KernelBase.dll)
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    <p>I'm trying to call methods from a C# COM project in an unmanaged Visual C++ solution, but I keep getting the next error</p> <pre><code>First-chance exception at 0x7697C41F (KernelBase.dll) in Program.exe: 0x04242420 (parameters: 0x31415927, 0x6F310000, 0x00BBDAE8). </code></pre> <p>at the next piece of code</p> <pre><code>SalesForceNew::IMyObjectClassPtr p; p.CreateInstance(__uuidof(SalesForceNew::TestObject)); // error SalesForceNew::MyObject mo = p-&gt;getObject(1, "a"); </code></pre> <p>However the value of <code>mo</code> is as expected (5, "aa").</p> <p>I import the tlb-file with this line of code:</p> <pre><code>#import "C:\Users\Bob\Desktop\ComTest\SalesForceNew\bin\x86\Debug\SalesForceNew.tlb" named_guids </code></pre> <p>The C# project is as follows:</p> <p>The interface:</p> <pre><code>using System.Runtime.InteropServices; namespace SalesForceNew { [ComVisible(true)] [Guid("22901ACD-CA30-4D3E-B84B-73B707026AE5")] public interface IMyObjectClass { MyObject getObject(int i, string s); } [ComVisible(true)] [StructLayout(LayoutKind.Sequential)] public struct MyObject { public int Getal; public string Text; } } </code></pre> <p>the class implementing the interface:</p> <pre><code>using System.Runtime.InteropServices; namespace SalesForceNew { [ClassInterface(ClassInterfaceType.None)] [Guid("234A2A35-F270-458D-A67B-C834EB794B27")] [ComVisible(true)] public class TestObject : IMyObjectClass { public MyObject getObject(int i, string s) { return new MyObject() { Getal = i * 5, Text = s + s }; } } } </code></pre> <p>I checked the options <code>Register for COM interop</code> and <code>Make assembly COM-Visible</code> in the properties of the C# COM project.</p> <hr> <p>UPDATE: the error won't come up if we change the frameworkversion of the C# COM project to 2.0, 3.0 or 3.5. It only shows up when the frameworkversion is 4.0 or 4.5.</p>
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