----

[Scott Nichols]
I recommend adding this C++ code to the WinUtils library for creating unique global identifiers (GUIDs). I had a customer that required a GUID be generated with each SOAP transaction so I wrote the Tcl method call in C++ (below) for this, and thought it might be a good candidate for the WinUtils library. The C++ code below is using two dependent libs: tclstub83.lib and rpcrt4.lib. Rpcrt4.lib is part of the Windows OS, and should come with Visual Studio or .net. The source code is so short that I went ahead and posted both C++ source files below:

'''TclGUID.h:'''

 /*
 * TclGUID.h v1.0 12-11-2003 Scott Nichols
 *
 */

 /* TCL Function prototype declarations */
 #ifndef TclGUID_H
 #define TclGUID_H

 #define USE_NON_CONST
 #define TCL_USE_STUBS
 
 /* Not sure which includes are really needed. I guessed. */
 #include <string.h>
 #include <tcl.h>
 #include <iostream>
 #include <afx.h>
 #include "StdAfx.h"


 extern "C"
 {
    __declspec(dllexport) int Tclguid_Init(Tcl_Interp* interp);

 }

 static int	GetGUID_ObjCmd _ANSI_ARGS_((ClientData clientData,
		    Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]));

 #endif


'''TclGUID.cpp:'''

 /*
 * TclGUID.cpp, v1.0 12/11/2003, Scott J. Nichols
 * scott.nichols4@comcast.net
 *
 * The GetGUID Tcl method returns a 128 bit unique identifier
 * to the Tcl interpreter. Microsoft calls it a globally unique identifier (GUID).
 * The application I am using for is the transaction ID for SOAP messages. This was a customer
 * requirment of mine.
 *
 */

 #include "TclGUID.h"

 static int	GetGUID_ObjCmd _ANSI_ARGS_((ClientData clientData,
		    Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]))
 {

	GUID guid;

	// create random GUID
	guid = GUID_NULL;
	::CoCreateGuid(&guid);
	
	if (guid == GUID_NULL)
	{
		Tcl_Obj		*obj_result = Tcl_NewStringObj((const char *)"Unable to create GUID.",
                                strlen((const char *) "Unable to create GUID."));
		Tcl_SetObjResult(interp,obj_result);
		
		return TCL_ERROR;
	}
	else
	{

		BYTE * str;
		UuidToString((UUID*)&guid, &str);

		CString unique((LPTSTR)str);

		unique.MakeUpper();
	
		RpcStringFree(&str);
		
		// Return the GUID to the Tcl Interpreter
		Tcl_Obj	*obj_result = Tcl_NewStringObj((const char *)unique,
                                                       strlen((const char *)unique));
		Tcl_SetObjResult(interp,obj_result);
		return TCL_OK;
	}

 }

 /* Main Routine in the TCL Extension DLL */
 int Tclguid_Init(Tcl_Interp *interp)
 {

	#if TCL_MAJOR_VERSION == 8 && TCL_MINOR_VERSION >= 1
		// Does the TCL interpreter support version 8.3 of TCL?
		if (Tcl_InitStubs(interp,"8.3",0) == NULL)
			return TCL_ERROR;
	#endif

	Tcl_CreateObjCommand(interp, "GetGUID", GetGUID_ObjCmd,
		      (ClientData) NULL, (Tcl_CmdDeleteProc *) NULL);

	return (Tcl_PkgProvide(interp,"TclGUID","1.0") == TCL_ERROR ? TCL_ERROR : TCL_OK);
 }

Each time the GetGUID method is called from Tcl a different 128 bit number is returned that looks similar to this: DE4ED408-5200-46E5-8AD1-EEF7351A7C07

----