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    <p>As I asked you in our mail conversation: Do you really use a 64Bit office?<br> This is very unlikely, that's why I wanted to check that upfront.</p> <p>Even if you do use a 64Bit Office, it should still work. One thing you have to remember: When you call a DLL function from VBA, the string type that is passed will be an LPStr (pointer to an Ansi Char). AnsiBStr should do it as well. But the classes you define will use the BStr, which is standard for COM.</p> <p>Here's a simplified sample, which does neither require the MSSQL client libs nor ADODB. (So less points of failure) Disclaimer: While I do have a 64Bit Windows, I only have an x86 Office (2007) installed:</p> <pre><code>[ComVisible(true), ClassInterface(ClassInterfaceType.AutoDual)] public class Sample { public string Text { [return: MarshalAs(UnmanagedType.BStr)] get; [param: MarshalAs(UnmanagedType.BStr)] set; } [return: MarshalAs(UnmanagedType.BStr)] public string TestMethod() { return Text + "..."; } } static class UnmanagedExports { [DllExport(CallingConvention = CallingConvention.StdCall)] [return: MarshalAs(UnmanagedType.IDispatch)] static Object CreateDotNetObject([MarshalAs(UnmanagedType.LPStr)] String text) { try { return new Sample { Text = text }; } catch (Exception ex) { MessageBox.Show(ex.Message, ex.GetType().Name, MessageBoxButtons.OK, MessageBoxIcon.Error); return null; } } } </code></pre> <p>And this is how to use it from anything VBA-ish (e.g. Excel or Access)</p> <pre><code>Declare Function CreateDotNetObject Lib "The full path to your assembly or just the assembly if it is accessible from Excel" (ByVal text As String) As Object Sub test() Dim instance As Object Set instance = CreateDotNetObject("Test 1") Debug.Print instance.Text Debug.Print instance.TestMethod instance.text = "abc 123" ' case insensitivity in VBA works as expected Debug.Print instance.Text End Sub </code></pre> <p>If this is working for you, we can get from there to wherever you want to go. But it would be important to know what kind of office version (CPU platform) you have, and whether this simple sample works <strong>first</strong>.</p>
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    1. POExporting C function from C# and using it in VBA
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    1. USRobert Giesecke
    1. USRobert Giesecke
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    1. COI edited my question!
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      1. USPeter Sapl
    2. COPeter, I haven't checked the docs, but I kinda doubt that StreamReader is ComVisible(true).
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      1. USRobert Giesecke
    3. COI hate Microsoft! Use "Microsoft ActiveX Data Object 2.5 Library" instead of "Microsoft ActiveX Data Object 2.8 Libraray" and everything is ok, on WinXP aswell as Windows 7 (64-bit). Thanks a lot to you Robert, your solution is great!
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      1. USPeter Sapl
 

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