can not use PSQL driver on windows7 machine

[mak_user]

This is the code for the connection:

bool createPostgreSQLConnection()
{
    qDebug() << "--------------------";
    qDebug() << "Postgree connection";
    QSqlDatabase db = QSqlDatabase::addDatabase("QPSQL7");
    qDebug() << "DRIVERS :" << QSqlDatabase::drivers();
    db.setHostName("127.0.0.1");
    db.setDatabaseName("DatabaseName");
    db.setPassword("Password");
    db.setUserName("UserName");
 
    if (!db.open()) {
       qDebug()<< db.lastError().text();
       return false;
     }
    return true;
}

bool createPostgreSQLConnection()
{
    qDebug() << "--------------------";
    qDebug() << "Postgree connection";
    QSqlDatabase db = QSqlDatabase::addDatabase("QPSQL7");
    qDebug() << "DRIVERS :" << QSqlDatabase::drivers();
    db.setHostName("127.0.0.1");
    db.setDatabaseName("DatabaseName");
    db.setPassword("Password");
    db.setUserName("UserName");

    if (!db.open()) {
       qDebug()<< db.lastError().text();
       return false;
     }
    return true;
}

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This files I got after compilation of plugin:
libqsqlpsql4.a
libqsqlpsqld4.a
qsqlpsql4.dll
qsqlpsqld4.dll

I copied this files in {QTPath}\plugins\sqldrivers and I still get this error:
--------------------
Postgree connection
QSqlDatabase: QPSQL7 driver not loaded
QSqlDatabase: available drivers: QSQLITE QODBC3 QODBC
DRIVERS : ("QSQLITE", "QODBC3", "QODBC")
"Driver not loaded Driver not loaded"

I have no idea what could be the problem.

Earlier today I do the same for ODBC driver(compile, copy in the folder and build application) and everything was working fine.
Could you help me?


Note: I use mingw32-make from QT distribution

[mak_user]

Does anyone work successfully with PostgreSQL under windows7 or should I stop trying?

[Lesiok]

Did You have installed PostgreSQL on Windows 7 ? If not You must copy to app dir PostgreSQL dll's to.