Strange problem when I try to print a value?

7eleven · #1 13-May-2004, 03:24

Hello,

first method
---------------------------------------------------------------

CPP / C++ / C Code:

static int              sender_buffer[4];
static int 		frame_counter 		= 1;

static void transmit(MSG *msg, FRAMEKIND kind, int msglen, int seqno)
{
	
    	sender_buffer[frame_counter] = f;
	frame_counter++;
.........
..........
..........
.........
......
physical_method(blah, balh, blah);

}

/* second method */
static void physical_ready(CnetEvent ev, CnetTimer timer, CnetData data)
{
 printf("Frame Counter %d\n", frame_counter);
}

-----------------

The program will call transmit method first, then pyhsical_ready method. The problem is when I try to display the frame_counter, is always 1. I have increment the frame_counter on ther first method. instead frame_counter is global variable.

I do not know why it always print zero on pyhsical_ready method, but it's find when i try to print from other method?

Any Ideas Guys what wrong with that...

Thank's

dsmith · #2 13-May-2004, 07:28

Hello 7eleven.

I don't exactly follow your code, but I do have a question. Why have you defined a global as static? Have you tried not defining this as static. Global variables are implicitly static and adding the word static may be doing something else. This is from MSDN and I don't exactly understand what it means by internal linkage, but the rest is pretty straight forward

Quote:

Originally Posted by MSDN

Objects and variables defined outside all blocks have static lifetime and external linkage by default. A global object or variable that is explicitly declared as static has internal linkage.

I don't know if this helps, but if you aren't positive that the global variable should be a "static int", try it with just "int" and see if that helps.

Cheers,
d

davekw7x · #3 15-May-2004, 10:45

When I see programs using global variables, I ask, "Why?" Are there lots of routines that access frame_counter, and you just didn't want to use it as an argument, or what? Are you sure that no other functions have modified frame_counter?

Here's an example that successfully does what I think you are attempting.
Note that, for debug purposes, I put printf() statements in certain places that allow me to see what's happening to the variable in question. You can do the same.

CPP / C++ / C Code:

#include <stdio.h>

static int  frame_counter = 1;

static void first_function(void);
static void second_function(void);

int main()
{ 


  printf("\n---Debug: going into first_function():     frame_counter = %d\n\n",
          frame_counter);

  first_function();

  printf("\n---Debug: returned from first_function():  frame_counter = %d\n\n",
          frame_counter);

  return 0;
}

static void first_function()
{
  frame_counter++;

  printf("\n --Debug: going into second_function():    frame_counter = %d\n\n",
          frame_counter);

  second_function();

  printf("\n --Debug: returned from second_function(): frame_counter = %d\n\n",
          frame_counter);
}

static void second_function()
{
 printf("Frame Counter = %d\n", frame_counter);
}

Regards,

Dave

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