smartdevice C# dll in VC++

Question

I'm trying to create a DLL in C# for windows mobile, and I have an error when I try to access the dll in VC++. Is possible to create a DLL in C# and access it in VC++, using Windows Mobile? I'm using Windows Mobile 6 SDK. The following code works very well in Desktop.

The C# code:

using System; 
using System.Collections.Generic; 
using System.Text; 
using System.Runtime.InteropServices; 
namespace HttpLibrary 
{ 
    [ComVisible(true)] 
    [StructLayout(LayoutKind.Sequential)] 
    public struct StorageGroup 
    { 
        public int count; 
        public string[] Name; 
        public string[] sgdName; 
        public string[] logfolder; 
        public string[] systemfolder; 
    } 
    [ComVisible(true)] 
    public struct MyResult 
    { 
        public string Name; 
    } 
    [ComVisible(true)] 
    [Guid("F55EDB71-E3FC-4FC2-A25B-6E09C49B3E93")] 
    public interface IMyClass1 
    { 
        int helloWorld(); 
        StorageGroup getStorageGroup(); 
    } 
    [ClassInterface(ClassInterfaceType.None)] 
    [Guid("7B0D798D-DD45-41E1-A0D4-2FC453B36CED")] 
    [ComVisible(true)] 
    public class Class1 : IMyClass1 
    { 
        public Class1() 
        { 
            //constructor.. create object.. 
        } 
        public int helloWorld() 
        { 
            //dont do anything just return 10 so that client can get 
the return value.. 
            return 10; 
        } 
        public MyResult helloWorld(int i) 
        { 
            MyResult result = new MyResult(); 
            result.Name = "jigar"; 
            return result; 
        } 
        public StorageGroup getStorageGroup() 
        { 
            //Put code here.. 
            StorageGroup sg = new StorageGroup(); 
            int count = 3; 
            sg.Name = new string[count]; 
            sg.sgdName = new string[count]; 
            sg.logfolder = new string[count]; 
            sg.systemfolder = new string[count]; 
            sg.count = count; 
            for (int i = 0; i 

The C++ code: 


#import "c:\\pocket\\HTTP_POST_CS\\HttpLibrary\\HttpLibrary\\bin\\Debug 
\\HttpLibrary.tlb" 
BOOL CHttpLibraryTestDlg::OnInitDialog() 
{ 
        CDialog::OnInitDialog(); 
        // Set the icon for this dialog.  The framework does this 
automatically 
        //  when the application's main window is not a dialog 
        SetIcon(m_hIcon, TRUE);                 // Set big icon 
        SetIcon(m_hIcon, FALSE);                // Set small icon 
        CoInitializeEx(NULL, 0); 
        HttpLibrary::IMyClass1Ptr pIMyClass1(__uuidof(HttpLibrary::Class1)); 
--->This line gives me a Raise Exception 
        int i=-1; 
        i = (int)pIMyClass1->helloWorld(); 
        return TRUE;  // return TRUE  unless you set the focus to a control 
}

Answer 1

You cannot do this in the Compact Framework because it is missing CLR hosting capabilities. There is no way for a native app to spin up the execution engine inside it's own process, so it can't load managed code. This means your own native apps can't load managed DLLs, nor can the device browser.