unable to send a char parameter from main to a function Post: 302564364

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Top Forums Programming unable to send a char parameter from main to a function Post 302564364 by Corona688 on Thursday 13th of October 2011 12:58:38 PM

10-13-2011

Registered User

I think you're very confused about variables, assignments, and return values, not just how getopt works. I continue to suspect the existence of latent bugs in your treewalker function, whether it works for you right now or not. Please post your entire code, not just the bits you think I need to know.

Your 'dir', 'file', and 'slink' variables are useless, you already know what 'c' is.

You shouldn't be setting optarg, you should be using optarg.

I still cannot fathom the purpose of your getFileMode function. You just return the same value you get, after setting a local variable, which changes nothing outside the function. What is it supposed to be doing?

Code:

switch (c) {
        case 't':
            // c isn't an ASCII 0, it's an ascii NULL.  If you want it to print 0,
            // initialize c to c='0' at the start of main.
            printf("Type is  set to: %c\n", charSetter); /*should be zero*/

            // the option string appears in optarg.
            printf("option:  %s\n", optarg);
            break;
            
        case 'd':
        case 'f':
        case 'l':
            charSetter=c;
            printf("%c is set\n", charSetter);
            break;
        default:
            fprintf(stderr, "Uknown option\n");
            exit(1);
        }

---------- Post updated at 10:58 AM ---------- Previous update was at 10:55 AM ----------

If your variables were an attempt to organize it, I think enums are closer to what you want. They even work in switch statements.

Code:

enum
{
        TYPE_DIR='d',
        TYPE_FILE='f', 
        TYPE_SLINK='l',
        TYPE_T='t',
};

...

switch (c) {
        case TYPE_T:
            // c isn't an ASCII 0, it's an ascii NULL.  If you want it to print 0,
            // initialize c to c='0' at the start of main.
            printf("Type is  set to: %c\n", charSetter); /*should be zero*/

            // the option string appears in optarg.
            printf("option:  %s\n", optarg);
            break;
            
        case TYPE_DIR:
        case TYPE_FILE:
        case TYPE_SLINK:
            charSetter=c;
            printf("%c is set\n", charSetter);
            break;
        default:
            fprintf(stderr, "Uknown option\n");
            exit(1);
        }

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tk_setappname

Tk_SetAppName(3)					       Tk Library Procedures						  Tk_SetAppName(3)

__________________________________________________________________________________________________________________________________________________

NAME

       Tk_SetAppName - Set the name of an application for 'send' commands

SYNOPSIS

       #include <tk.h>

       const char *
       Tk_SetAppName(tkwin, name)

ARGUMENTS

       Tk_Window tkwin (in)	      Token for window in application.	Used only to select a particular application.

       const char *name (in)	      Name under which to register the application.
_________________________________________________________________

DESCRIPTION

       Tk_SetAppName associates a name with a given application and records that association on the display containing with the application's main
       window.	After this procedure has been invoked, other applications on the display will be able to use the send command to invoke operations
       in  the	application.  If name is already in use by some other application on the display, then a new name will be generated by appending "
       #2" to name;  if this name is also in use, the number will be incremented until an unused name is found.  The return value from the  proce-
       dure is a pointer to the name actually used.

       If the application already has a name when Tk_SetAppName is called, then the new name replaces the old name.

       Tk_SetAppName also adds a send command to the application's interpreter, which can be used to send commands from this application to others
       on any of the displays where the application has windows.

       The application's name registration persists until the interpreter is deleted or the send command is deleted from interp,  at  which  point
       the  name is automatically unregistered and the application becomes inaccessible via send.  The application can be made accessible again by
       calling Tk_SetAppName.

       Tk_SetAppName is called automatically by Tk_Init, so applications do not normally need to call it explicitly.

       The command tk appname provides Tcl-level access to the functionality of Tk_SetAppName.

KEYWORDS

       application, name, register, send command

Tk									4.0							  Tk_SetAppName(3)