using existing tcl c procedures in tcl script

How to use Tcl_ParseCommand or list of Tcl C procedures already available under "http://tmml.sourceforge.net开发者_JAVA百科/doc/tcl/". Do i need to write wrapper c procedure and init procedure for each of these command?

-Prasath

The easiest way to access the parser commands Tcl_ParseCommand etc. might be the tclparser extension (e.g. the (orphaned) tclparser package in Debian/Ubuntu or build yourself from the sources http://wiki.tcl.tk/1660).

If you need to handle other Tcl C-library commands as well, you should have a look at how to write a Tcl extension in general. A lot of examples and advice for that can be found at: http://wiki.tcl.tk/1191

Yes, you do need to write a wrapper C-implemented command to use those. However, there are a number of neat tools to make that easier. In particular, critcl is interesting choice, which you might use like this (very noddy example):

package require critcl
critcl::cproc foo {Tcl_Interp* interp Tcl_Obj* argObj} ok {
    int nObjs;
    Tcl_Obj **objs;

    if (Tcl_ListObjGetElements(interp, argObj, &nObjs, &objs) != TCL_OK)
        return TCL_ERROR;
    if (nObjs != 2) {
        Tcl_AppendResult(interp, "need list of length 2", NULL);
        return TCL_ERROR;
    }
    Tcl_SetObjResult(interp, Tcl_NewBooleanObj(
            !strcmp(Tcl_GetString(objs[0]), Tcl_GetString(objs[1]))));
    return TCL_OK;
}
puts [foo {a a}]

The useful documentation is on the Tcler's Wiki.

Note that for Tcl_ParseCommand in particular, you're better off using the tclparser package as schlenk mentions. That's because the result of that function (as an out parameter) is significantly non-trivial; it needs quite a lot of converting to turn into the sort of thing that works as a Tcl value.