C# Signature:

[DllImport("ole32.dll", ExactSpelling=true, PreserveSig=false)]
[return: MarshalAs(UnmanagedType.Interface)]
static extern object CoCreateInstance(
   [In, MarshalAs(UnmanagedType.LPStruct)] Guid rclsid,
   [MarshalAs(UnmanagedType.IUnknown)] object pUnkOuter,
   CLSCTX dwClsContext,
   [In, MarshalAs(UnmanagedType.LPStruct)] Guid riid);

User-Defined Types:

CLSCTX

Notes:

None.

Tips & Tricks:

Please add some!

Sample Code:

Please add some!

Alternative Managed API:

Have a look at System.Activator.CreateInstance and its various overloads. Sample:

Guid CLSID_ShellDesktop = new Guid("00021400-0000-0000-C000-000000000046");
Type shellDesktopType = Type.GetTypeFromCLSID(CLSID_ShellDesktop, true);
object shellDesktop = Activator.CreateInstance(shellDesktopType);