Driver not loaded

Hello, i am new with qt/c++. I am trying to use postgresql driver( postgresql 8.2), but i got a error: Driver not loaded.
I am using qt4.4.1(open source edition) on windows xp. I am using eclipse via Qt eclipse Integration v1.4.1.
Everything is fine with postgres. I connected via java.
My .pro is like
...
INCLUDEPATH = "D:\Arquiv~1\PostgreSQL\8.2\include"
QT += core \
gui \
sql \
xml \
...
LIBS += "D:\Arquiv~1\PostgreSQL\8.2\lib\ms\libpq.lib"
....

I put the, dlls, qsqlpsql4.dll and qsqlpsqld4.dll on folder qtdir/ bin

when i execute the snippet: qDebug() << QSqlDatabase::drivers(); got ("QSQLITE", "QODBC3", "QODBC")

Somebody could help-me
regards,
Rogério

See How to build the QPSQL plugin.

cd %QTDIR%\src\plugins\sqldrivers\psql
qmake -o Makefile "INCLUDEPATH+=D:\Arquiv~1\PostgreSQL\8.2\inclu de" "LIBS+=D:\Arquiv~1\PostgreSQL\8.2\lib\ms\libpq.lib " psql.pro
make.

yes, i did this before and got:
qsqlpsqld4.dll; qsqlpsql4.dll; libqsqlpsqld4.a; libqsqlpsql4.a.
The dlls were generated in folder qtdir\plugins\sqldrivers.

The diference is that i used "make" not "nmake". I am using MinGW

is missing something else to load driver psql?

thanks,
Rogério

You might need to add the PSQL DLL to PATH. You can open qsqlpsql4.dll to Dependency Walker to verify that loading the plugin is possible.

I tried something else. I compiled with nmake.
qmake -o Makefile "INCLUDEPATH+=D:\Arquiv~1\PostgreSQL\8.2\inclu de" "LIBS+=D:\Arquiv~1\PostgreSQL\8.2\lib\ms\libpq .lib " psql.pro
nmake.

But, i have to compile my program with nmake Too.this way, I could load postgresql driver. If use make to compile, the program not work(Driver not load).

I would like use (mingw)make. Is it possible use mingw(make)?


regards,
Rogério

If your psql library is built with MSVC, you cannot use it with a different compiler.

I have a similar problem:
I'm using Qt 4.5.0 with PostgreSQL 8.3 on Windows vista. The included documentation says to use this:

cd %QTDIR%\src\plugins\sqldrivers\psql
qmake -o Makefile "INCLUDEPATH+=C:\psql\include" "LIBS+=C:\psql\lib\ms\libpq.lib" psql.pro
nmake

Since installation of postgres doesn't have the ms dir i changed it to look like this:

cd %QTDIR%\src\plugins\sqldrivers\psql
qmake -o Makefile "INCLUDEPATH+=C:\psql\include" "LIBS+=C:\psql\lib\libpq.lib" psql.pro
nmake

First of all it tells me nmake is not a valid command so i use make. This completes without any recognizable errors but when i check QSqlDatabase::drivers() it tells me
QSQLITE
QODBC3
QODBC Which are the drivers that Qt came with anyway

What do I have to do to get this thing to compile?

I solved the problem - well, kind of. Found the answer here http://qtwiki.org/QPSQL_driver_not_l...usual_solution

I have similar problem with MYSQL driver. From my app I get "Driver not loaded.". From QQSqlDatabase for availabe drivers I get: "QSQLITE QMYSQL3 QMYSQL QODBC3 QODBC". I've built plugin according to QtCentre's Wiki. I've copied qmysql.dll into qt's bin dir, which IS IN PATH. I have also added "+=SQL" into .pro file. What else can be wrong or what am I missing, please help!