[Gambas-user] external functions and structs

[T Lee Davidson]

When I try to run your code, I get:
Cannot find dynamic library 'libais.so.1.9.so': libais.so.1.9.so: cannot open shared object file: No such file or directory in
Main:61.

In addition to your:
Library "libais.so.1.9"

I tried:
Library "./libais.so.1.9"
Library "../libais.so.1.9"

No love. I don't know why Gambas is changing the name I specified.


___
Lee


On 11/28/18 7:39 AM, gen braga wrote:
> Hi there,
> 
> I'm trying to use a method from an external library whose signature is as follow
> 
> int __stdcall assemble_vdm( ais_state *state, char *str )
> 
> ais_state is:
> 
> #define SIXBIT_LEN   255
> 
> typedef struct {
>     unsigned char msgid;               //!< Message ID 0-31
>     unsigned int  sequence;            //!< VDM message sequence number
>     unsigned int  total;               //!< Total # of parts for the message
>     unsigned int  num;                 //!< Number of the last part stored
>     char          channel;             //!< AIS Channel character
>     sixbit        six_state;           //!< sixbit parser state
> } ais_state;
> 
> six_state is:
> 
> typedef struct {
>     char bits[SIXBIT_LEN];          //!< raw 6-bit ASCII data string
>     char *p;                        //!< pointer to current character in bits
>     unsigned char remainder;        //!< Remainder bits
>     unsigned char remainder_bits;   //!< Number of remainder bits
> } sixbit;
> 
> I declared them all as follow:
> 
> Public Struct sixbit
>   bits[255] As Byte                               'raw 6 - bit ASCII data string --> era [SIXBIT_LEN - 1]
>   p As String                                    'pointer To current character In bits
>   remainder As Byte                               'Remainder bits
>   remainder_bits As Byte                          'Number Of remainder bits
> End Struct
> 
> Public Struct AIS_State
>     msgid As Byte                               'Message ID 0 - 31
>     sequence As Short                         'era DWORD; / / ! < VDM message sequence number
>     total As Short                            'era DWORD; / / ! < Total # Of parts For the message
>     num As Short                              'era DWORD; / / ! < Number Of the Last part stored
>     channel As Byte                             ': Char; / / ! < AIS Channel character
>     six_state As SixBit                         '; / / ! < sixbit parser state
> End Struct
> 
> Private Extern assemble_vdm(state As AIS_State, str1 As String) As Integer
> 
> Ok....
> In my Main method I call the assemble_vdm function and the result is as expected, returning an integer between 0 and 5 meaning
> what's going on, I can confirm it by changing the second parameter's contents. But that method, modifies the first parameter
> (state) internally, and I should use it afterwards to decide what do to, reading state.msgid
> 
> The fact is, when I read it, its empty and rises segfault.... Does anyone knows how to deal with it?
> 
> The library's sources are at https://github.com/bcl/aisparser/tree/master/c
> 
> Attached are my sources.
> 
> Greetings,
> 
> 
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