C# Signature:

[DllImport("ole32.dll")]
static extern int ProgIDFromCLSID([In] ref Guid clsid,
   [MarshalAs(UnmanagedType.LPWStr)] out string lplpszProgID);

User-Defined Types:

None.

Notes:

None.

Tips & Tricks:

I find it better to turn off PreserveSig for methods that return an HRESULT and have a trailing out parameter, providing that the HRESULT does not have more that one success code (typically S_OK only). This results in a slightly cleaner syntax where the out parameter becomes the return value and a failing HRESULT results in an exception.

[DllImport("ole32.dll", CharSet=CharSet.Unicode, PreserveSig=false)]
static extern string ProgIDFromCLSID([In()]ref Guid clsid);

C# Sample Code:

using System.Diagnostics;
using System.Runtime.Interop;

PreserveSig=true

class Program
{
    [DllImport("ole32.dll")]
    static extern int ProgIDFromCLSID([In()]ref Guid clsid, [MarshalAs(UnmanagedType.LPWStr)]out string lplpszProgID);

    [STAThread()]
    static void Main(string[] args)
    {
       Guid   g = new Guid("88D969C0-F192-11D4-A65F-0040963251E5"); // MSXML 4.0 DOM.
       string progId;
       int    result = ProgIDFromCLSID(ref g, out progId);

       Debug.Assert(result == 0);
       Debug.Assert(progId == "Msxml2.DOMDocument.4.0");
    }
}

PreserveSig=false

class Program
{
    [DllImport("ole32.dll", CharSet=CharSet.Unicode, PreserveSig=false)]
    static extern string ProgIDFromCLSID([In()]ref Guid clsid);

    [STAThread()]
    static void Main(string[] args)
    {
       Guid   g = new Guid("88D969C0-F192-11D4-A65F-0040963251E5"); // MSXML 4.0 DOM.
       string progId = ProgIDFromCLSID(ref g);

       Debug.Assert(progId == "Msxml2.DOMDocument.4.0");
    }
}

Alternative Managed API:

Do you know one? Please contribute it!

Please edit this page!

Do you have...

• helpful tips or sample code to share for using this API in managed code?
• corrections to the existing content?
• variations of the signature you want to share?
• additional languages you want to include?

Select "Edit This Page" on the right hand toolbar and edit it! Or add new pages containing supporting types needed for this API (structures, delegates, and more).