COM组件 如何实现 CLSID 与ProgID的互相调用

Question

在C#中，知道 CLSID 或者PorgID,如何调用COM组件里面的方法呀？实现了从 CLSID 到 PROGID的转化也可以？

Answer 1

你需要互操作两个API  CLSIDFromProgID ProgIDFromCLSID：

        WINOLEAPI ProgIDFromCLSID(


  REFCLSID
 clsid
,


  LPOLESTR 
* lplpszProgID


);

        HRESULT CLSIDFromProgID(


  LPCOLESTR
 lpszProgID
,


  LPCLSID
 pclsid


);

Answer 2

有具体点的代码吗？

Answer 3

        [DllImport("Ole32.dll", EntryPoint = "CLSIDFromProgID")]
        public static extern long CLSIDFromProgID([In, MarshalAs(UnmanagedType.BStr)] string lpszProgID, [Out]out Guid pclsid);

        [DllImport("Ole32.dll", EntryPoint = "ProgIDFromCLSID")]
        private static extern long ProgIDFromCLSID([In] ref Guid clsid, [MarshalAs(UnmanagedType.LPWStr)] out string lplpszProgID);


使用:
            string progid = "Excel.Application";
            Guid clsid;
            long hr = CLSIDFromProgID( progid, out clsid);

            string nprogid = string.Empty;
            hr = ProgIDFromCLSID(ref clsid, out nprogid);