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OrbWorks Community Forum • View topic - List and global variables

List and global variables

A PocketC native palm library offering native forms and assorted utilities

Postby auzan00 on Mon May 06, 2002 11:29 am

It seems to me that FsetList cannot handle global variables : I have to copy my array in a local variable to be able to set it in a List.

However, this was for PToolBoxLib v 7.3.3

Fabrice
auzan00
 
Posts: 20
Joined: Fri Oct 26, 2001 10:19 am
Location: France

Postby jstadolnik on Tue May 07, 2002 2:26 am

This is actually a bug in pocketC. Here is an example showing what's happening.

//globals_test.c
string numbers[3] = {"1","2","3"};
main() {
puts("Pointer to global="+(int)numbers+"\n"); //returns 0!
puts("Data="+numbers[0]+"\n");
}

The problem is that a 0 (NULL) pointer is actually pointing to data! A null pointer should never point to data.

To get around this problem do the following:
//globals_test.c
int a; //add a dummy variable before the string array
string numbers[3] = {"1","2","3"};
main() {
puts("Pointer to global="+(int)numbers+"\n"); //returns 0!
puts("Data="+numbers[0]+"\n");
}

Joe


The PToolboxLib guy.
http://www.geocities.com/retro_01775/PToolboxLib.htm
jstadolnik
 
Posts: 1741
Joined: Wed Dec 06, 2000 3:34 am
Location: USA


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