use qpsql

[raphaelf]

Hi everybody,
QT: 4.1.3
OS: WIN XP

I tried to connect to my sql server via odbc and it works perfect. I have installed postgre 8.1 on my machine and build the plugin for postgre. I get a new file "qsqlpsql.dll". So i would like to connect it to a Postgre database. I get the known error: Driver not loaded, driver not loaded.
Here my code:

QSqlDatabase db = QSqlDatabase::addDatabase("QPSQL");
        db.setHostName("localhost");
        db.setDatabaseName("inventar");
        db.setUserName("postgres");
        db.setPassword("tekoteko");
        if(!db.open())
        {
    	QMessageBox::information(this,"",db.lastError().text());
        return false;
    	}    
        else
        {
        . . .

QSqlDatabase db = QSqlDatabase::addDatabase("QPSQL");
        db.setHostName("localhost");
        db.setDatabaseName("inventar");
        db.setUserName("postgres");
        db.setPassword("tekoteko");
        if(!db.open())
        {
    	QMessageBox::information(this,"",db.lastError().text());
        return false;
    	}    
        else
        {
        . . .

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What could i try to make my connection running?

Thanks