How to use tcl apis in a c code

Question

I want to use some of the functionalities(APIs) of my tcl code in another \"c\" code file. But i am not getting how to do that especiallly how to link them. For that i have take

Answer 1

To evaluate a script from C code, use Tcl_Eval() or one of its close relatives. In order to use that API, you need to link in the Tcl library, initialize the Tcl library and create an interpreter to hold the execution context. Plus you really ought to do some work to retrieve the result and print it out (printing script errors out is particularly important, as that helps a lot with debugging!)

Thus, you get something like this:

#include 
#include 
#include 

int main(int argc, char **argv) {
    Tcl_Interp *interp;
    int code;
    char *result;

    Tcl_FindExecutable(argv[0]);
    interp = Tcl_CreateInterp();
    code = Tcl_Eval(interp, "source myscript.tcl; add_two_nos");

    /* Retrieve the result... */
    result = Tcl_GetString(Tcl_GetObjResult(interp));

    /* Check for error! If an error, message is result. */
    if (code == TCL_ERROR) {
        fprintf(stderr, "ERROR in script: %s\n", result);
        exit(1);
    }

    /* Print (normal) result if non-empty; we'll skip handling encodings for now */
    if (strlen(result)) {
        printf("%s\n", result);
    }

    /* Clean up */
    Tcl_DeleteInterp(interp);
    exit(0);
}