Thread: Linker error VS2008 c++

Hi, I'm traing to read a row from a table using visual studio 2008 and libpq.
I'm having problem with getting a int from a querry result, below im pasting
my code

struct subjects_group
{
    unsigned long id;
    std::string name;
};

list<subjects_group> QS_PQsql::getGroups()
{
    list<subjects_group> lista;
    subjects_group temp;
    char       *iptr;

    res = PQexec(conn, "SELECT * FROM subjects_group");
    if( PQresultStatus(res) != PGRES_TUPLES_OK )
    {
        PQclear(res);
        return lista;
    }
    iptr = PQgetvalue(res,0,0);

    temp.id = ntohl(*(uint32_t*)iptr); //here is line that causing troubles it
gives me a several linker error

           temp.name = PQgetvalue(res,0,1);
    lista.push_back(temp);

    return lista;
}

the errors that i've received:
1>QS_PQsql.obj : error LNK2028: unresolved token (0A000357) "extern "C"
unsigned long __stdcall ntohl(unsigned long)" (?ntohl@@$$J14YGKK@Z)
referenced in function "public: class std::list<struct subjects_group,class
std::allocator<struct subjects_group> > __clrcall QS_PQsql::getGroups(void)"
(?getGroups@QS_PQsql@@$$FQ$AAM?AV?$list@Usubjects_group@@V?$allocator@Usubjects_group@@@std@@@std@@XZ)
1>QS_PQsql.obj : error LNK2019: unresolved external symbol "extern "C"
unsigned long __stdcall ntohl(unsigned long)" (?ntohl@@$$J14YGKK@Z)
referenced in function "public: class std::list<struct subjects_group,class
std::allocator<struct subjects_group> > __clrcall QS_PQsql::getGroups(void)"
(?getGroups@QS_PQsql@@$$FQ$AAM?AV?$list@Usubjects_group@@V?$allocator@Usubjects_group@@@std@@@std@@XZ)
1>C:\Users\Cin\Documents\Visual Studio 2008\Projects\QS
Queue\Debug\QSserver.exe : fatal error LNK1120: 2 unresolved externals

I needed a stdint.h header because of uint32_t and that header was missing
in vs2008 sa i take it form vs2010

Thanks in advance for any help

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On 11/04/2011 05:01 AM, Cin123 wrote:

> I needed a stdint.h header because of uint32_t and that header was missing
> in vs2008 sa i take it form vs2010

You can't usually do that. If it were that simple, MS would've probably
released stdint.h in a later VC++2008 service pack.

Why do you actually need uint32_t ? You can just typedef it. You have to
have conditionals for 32-bit and 64-bit compilation, but it's not
exactly hard.

Remove the copied header, fix up your code, and see if it links then.

--
Craig Ringer