Hello again.

I'm in the process of making a COM wrapper (enabling VB to connect to
PostGres) for the libpq library using Visual Studio 6.0 Pro, but have
a few problems. I can make use of the libpq.dll library from the COM
wrapper, but I thought that it might be a bit better if the actual
library routines was included in the COM wrapper, and thus making the
libpq.dll unnedded.

But if I include all the files that make up the library, then I can't
get a connection. I even tried to make a small test file which works
ok when using the dll, but doesn't when I include the actual .c files
which make up the dll and static link library (.lib). Linking with the
static link library that comes with the dll file doesn't work either.
This little program is what I've used. Has anybody succedded in lnking
an application with the static link library (libpq.lib) and actually
getting a working application??? If so then I'm very interested in
getting any help.

-------- test file ---------- test file -----------

#include <iostream.h>
#include "libpq-fe.h"

int main (int argc, char* argv[])
{
   PGconn *conn;

   cout << "Hello pgsql world!!!" << endl;
   cout << "Connecting to the database." << endl;
   conn = PQconnectdb("host=host.name user=root");
   if (PQstatus(conn) == CONNECTION_BAD) {
      cout << "Boohoo, the connection failed!!!" << endl;
      cout << "Value is " << (long) conn << endl;
   } else {
      cout << "Hurray, we got connected." << endl;
      PQfinish(conn);
   }
   return 0;
}

-------- test file ---------- test file -----------

Yours faithfully.
Finn Kettner.
PS. I have also created a project file for the psql application, if
this has any interest it might as well be included in the furture
distributions of postgresql. The dll and static link library is also
more or less finished, but as I can't link with the static link
library I don't think that it has much interest untill the problem is
solved.

Wed, 27 Sep 2000 01:32:01 +0100
"Finn Kettner" <fk@akf.dk>
libpq static link library dowsn't work (M$ VS6)


Finn Kettner wrote:

> Hello again.
>
> I'm in the process of making a COM wrapper (enabling VB to connect to
> PostGres) for the libpq library using Visual Studio 6.0 Pro, but have
> a few problems. I can make use of the libpq.dll library from the COM
> wrapper, but I thought that it might be a bit better if the actual
> library routines was included in the COM wrapper, and thus making the
> libpq.dll unnedded.
>
> But if I include all the files that make up the library, then I can't
> get a connection. I even tried to make a small test file which works
> ok when using the dll, but doesn't when I include the actual .c files
> which make up the dll and static link library (.lib). Linking with the
> static link library that comes with the dll file doesn't work either.
> This little program is what I've used. Has anybody succedded in lnking
> an application with the static link library (libpq.lib) and actually
> getting a working application??? If so then I'm very interested in
> getting any help.
>

libpq.dll calls WSAStartup() in dllmain() which is never
called from static library. Probably you had better
call WSAStartup() from upper level application.

Regards.

Hiroshi Inoue


Wed, 27 Sep 2000 16:23:19 +0900
Hiroshi Inoue <Inoue@tpf.co.jp>
Re: libpq static link library dowsn't work (M$ VS6)