Question

The C code

#include <glib.h>
//...
GHashTable *hash = g_hash_table_new(NULL, NULL);
GString val;

g_hash_table_insert(hash, (int*)5, g_string_new("Bar"));
val = g_hash_table_lookup(hash, (int*)5); // line 10

printf("Foo ~ %s\n", val->str); // line 16

if (NULL == val) // line 18
    printf("Eet ees null!\n");

Which produced:

ctest.c:10: error: incompatible types in assignment

ctest.c:16: error: invalid type argument of ‘->’ (have ‘GString’)

ctest.c:18: error: invalid operands to binary == (have ‘void *’ and ‘GString’)

What am I doing wrong? 🙁

EDIT: Some might be confused and ask ask themselves “Why didn’t she use g_string_printf()?”

Because I need to access gchar *str, printing was just my way of “debugging” it.

EDIT: Added line 18, and commented the spazzing lines (yes, lots of whites-paces all over the place. I’m dreadful, I know).

Answer 1

The function g_string_new returns a GString *. So that’s what’s getting stored in the hash. And the function g_hash_table_lookup returns a void *. You likely want something like this:

GString *val;
val = g_hash_table_lookup(hash, (int*)5);
printf("Foo ~ %s\n", val->str);