How to check if .net interoperability for excel is installed

Question

I am using .net Primary Interoperability Assembly for Excel in my code. But, the application can be run on machine which doesn\'t have .net PIA for Excel installed. I want to gi

Answer 1

I've used this Building block to load the x86 / x64 versions of hunspell in may NHunspell wrapper. maybe it is a good starting point for your own dynamic loader:

            // Initialze the dynamic marshall Infrastructure to call the 32Bit (x86) or the 64Bit (x64) Dll respectively 
            SYSTEM_INFO info = new SYSTEM_INFO();
            GetSystemInfo( ref info );

            // Load the correct DLL according to the processor architecture
            switch( info.wProcessorArchitecture )
            {
                case PROCESSOR_ARCHITECTURE.Intel:
                    string pathx86 = AppDomain.CurrentDomain.BaseDirectory;
                    if (!pathx86.EndsWith("\\"))
                        pathx86 += "\\";
                    pathx86 +=  Resources.HunspellX86DllName;

                    dllHandle = LoadLibrary(pathx86);
                    if (dllHandle == IntPtr.Zero)
                        throw new DllNotFoundException(string.Format(Resources.HunspellX86DllNotFoundMessage, pathx86));
                    break;

                case PROCESSOR_ARCHITECTURE.Amd64:
                    string pathx64 = AppDomain.CurrentDomain.BaseDirectory;
                    if (!pathx64.EndsWith("\\"))
                        pathx64 += "\\";
                    pathx64 += Resources.HunspellX64DllName;

                    dllHandle = LoadLibrary(pathx64);
                    if (dllHandle == IntPtr.Zero)
                        throw new DllNotFoundException(string.Format(Resources.HunspellX64DllNotFoundMessage, pathx64));
                    break;

look at this delegate declarations:

internal delegate bool HunspellSpellDelegate(IntPtr handle, [MarshalAs(UnmanagedType.LPWStr)] string word);

And how to bind a library function to it

HunspellSpell = (HunspellSpellDelegate)GetDelegate("HunspellSpell", typeof(HunspellSpellDelegate));

I think this should work for you too, but you have to declare the complete interop code. You can check out the Nhunspell code to get a working sample of this technique:

NHunspell Web Site