The compiler (actually the linker) is telling you that it can't find the
char *pcCityIdToCountryName(ADMIN_DB_DATA *pstHEader, unit uiCityID)
code anywhere. Is this function in another module? If so you will have to link against that module.
The -L syntax requires you to remove the "lib" from in front of the shared library name:
The .so or .sl is not needed.
Thankx for the reply!
As u have said the function is in another file called admin.c, but everything is included in Make file.....
is the statement i have written correct....
does Unresolved means an error... or can it be ignored?????
The reason being is that you don't know if the char pointer being passed back is still pointing to an allocated memory block. Sometimes I have seen functions pass back a pointer to a local variable or memory being allocated and then made free. It just so happens that you are pointing to a memory location that still has a string (null terminated) value. This may not be the case later on in the program's execution, especially when you are allocating and freeing memory frequently, and you may encounter a memory violation.
At least by copying string into a local variable you can protect against any future problems.
Of course, if it is your own function, you can make your own judgements as to the best way to call it, based on your overall design.
I am passing a char* to the function "reverse" and when I execute it with gdb I get:
Program received signal SIGSEGV, Segmentation fault.
0x000000000040083b in reverse (s=0x400b2b "hello") at pointersExample.c:72
72 *q = *p;
Attached is the source code.
I do not understand why... (9 Replies)
Have difficulty to understand this pure C code to only print vowels twice from input string. Questions are commented at the end of each place.
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
/*
*Demonstrate the use of dispatch tables
*/
/*Print a char... (11 Replies)
Does anyone know?
int x = 1;
int *p = &++x; //ok !
int *q = &x++; //gives an error :O
why the first pointer is ok but the second is an error? (13 Replies)
Hi,
In the below C code,
#include <stdio.h>
void print() {
printf("Hello\n");
}
int main() {
void (*f)() = (void (*)()) print;
f();
(*f)();
}
I wonder, how the syntaxes "f()" and "(*f)()" are treated as same without any error? Is this an improvement or ANSI/ISO... (1 Reply)
if i create an array of pointers to a structure "struct node" as:
struct node *r;
and create "n" number of "linked lists" and assign it to the various struct pointers r using some function with a return type as structure pointer as:
r=multiplty(.......) /*some parameters*/
is... (2 Replies)
Hi.
Problem: I have to parse the payload of a packet. The payload could be in Big Endian Format (network byte order) or little. That depends on a flag present in the header of the packet.
Solution: A horrible solution could be to check for that flag everytime I have to read a field in the... (11 Replies)
If one wants to get a start address of a array or a string or a block of memory via a function, there are at least two methods to achieve it:
(1) one is to pass a pointer-to-pointer parameter, like:
int my_malloc(int size, char **pmem)
{
*pmem=(char *)malloc(size);
if(*pmem==NULL)... (11 Replies)
Hello all
im trying to build function that will return void function pointer
what is mean is ( not working )
the main function
void * myClass::getFunction(int type){
if(type==1)
return &myClass::Test1;
if(type==2)
return &myClass::Test2;
}
void myClass::Test1(){... (1 Reply)