[Vala] Implicit array size for function allocating an array
Hello,
I'm trying to bind a C function which has the following prototype:
int sos_addresses_to_string(const struct sos_address *addresses,
char ***string_addresses, int nb);
It's job is to convert an array of addresses, into an array of their string
representation. So both the addresses array (in input) and the string_addresses
array will have the same size which is nb. So in output, string_addresses will
point to an allocated array of allocated char buffers.
I tried to bind it this way:
namespace Sos {
public struct Address {
...
public static int array_to_string([CCode (array_length_pos = 3)] Address
addresses[], [CCode (array_length = false] out string[] string_addresses);
}
}
and to use it with the following minimal code example:
public static int main(string[] args)
{
string[] strings;
Sos.Address[] addrs;
// the following call just populates the initial addrs array
Sos.Server.get_server_addresses(mambo, out addrs);
Sos.Address.array_to_string(addrs, out strings);
stdout.printf(@str_addr: $(strings[0])\n);
return Posix.EXIT_SUCCESS;
}
This approach works, but valgrind complains that the pointed string, in the
returned array, isn't freed. In fact, in the generated code, _vala_array_free is
called with an array length of -1, so only the array is freed, not the pointed
addresses.
I tried to add array_length_cexpr = addresses.length but it didn't do
anything, unless I remove 'array_length = false', but in this case, an extra
parameter is added and the code doesn't compile any-more.
What would be the best solution to this issue in your opinion ?
Thank you in advance.
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Re: [Vala] Implicit array size for function allocating an array
On 16/12/2014 10:52, Nicolas CARRIER wrote:
Hello,
I'm trying to bind a C function which has the following prototype:
int sos_addresses_to_string(const struct sos_address *addresses,
char ***string_addresses, int nb);
It's job is to convert an array of addresses, into an array of their
string representation. So both the addresses array (in input) and the
string_addresses array will have the same size which is nb. So in
output, string_addresses will point to an allocated array of allocated
char buffers.
I tried to bind it this way:
namespace Sos {
public struct Address {
...
public static int array_to_string([CCode (array_length_pos =
3)] Address addresses[], [CCode (array_length = false] out string[]
string_addresses);
}
}
and to use it with the following minimal code example:
public static int main(string[] args)
{
string[] strings;
Sos.Address[] addrs;
// the following call just populates the initial addrs array
Sos.Server.get_server_addresses(mambo, out addrs);
Sos.Address.array_to_string(addrs, out strings);
stdout.printf(@str_addr: $(strings[0])\n);
return Posix.EXIT_SUCCESS;
}
This approach works, but valgrind complains that the pointed string,
in the returned array, isn't freed. In fact, in the generated code,
_vala_array_free is called with an array length of -1, so only the
array is freed, not the pointed addresses.
I tried to add array_length_cexpr = addresses.length but it didn't
do anything, unless I remove 'array_length = false', but in this case,
an extra parameter is added and the code doesn't compile any-more.
What would be the best solution to this issue in your opinion ?
After the array_to_string call, do strings.length = addrs.length;
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[Vala] Cairo matrix multiply vapi question
Hi, Not sure if I've found a bug or am simply thick. I'm going with the latter :D At: https://git.gnome.org/browse/vala/plain/vapi/cairo.vapi Down near the end, under the public struct Matrix, look for: public void multiply (Matrix a, Matrix b); In the Cairo C docs, it looks like this: void cairo_matrix_multiply ( cairo_matrix_t *result, const cairo_matrix_t *a, const cairo_matrix_t *b); So, there's an initial arg that is a ref in which to receive the new matrix. Is the vapi missing something? \d ___ vala-list mailing list vala-list@gnome.org https://mail.gnome.org/mailman/listinfo/vala-list
Re: [Vala] Cairo matrix multiply vapi question
On 16/12/2014 10:58, Donn wrote: Hi, Not sure if I've found a bug or am simply thick. I'm going with the latter :D At: https://git.gnome.org/browse/vala/plain/vapi/cairo.vapi Down near the end, under the public struct Matrix, look for: public void multiply (Matrix a, Matrix b); In the Cairo C docs, it looks like this: void cairo_matrix_multiply ( cairo_matrix_t *result, const cairo_matrix_t *a, const cairo_matrix_t *b); So, there's an initial arg that is a ref in which to receive the new matrix. Is the vapi missing something? .multiply() is a method of Mmatrix. Therefore you call multiply on an instance of Matrix which is the one that will get modified. ___ vala-list mailing list vala-list@gnome.org https://mail.gnome.org/mailman/listinfo/vala-list
Re: [Vala] Cairo matrix multiply vapi question
On 16/12/2014 12:01, Luca Bruno wrote: .multiply() is a method of Mmatrix. Therefore you call multiply on an instance of Matrix which is the one that will get modified. Ah, thanks Luca. \d ___ vala-list mailing list vala-list@gnome.org https://mail.gnome.org/mailman/listinfo/vala-list
