Qt Extended Home · Index · Classes · Headers · Overviews

<trace.h> - <trace.h>

The <trace.h> header contains some useful debugging macros. More...

Macros

• LOG ()
• TRACE ( CATEGORY )
• WARNING ()

The <trace.h> header contains some useful debugging macros.

You use the macros in this file like this.

    void MyClass::MyFunc()
    {
        TRACE(TRACE) << "MyClass::MyFunc";

        otherfunc( 1 );
    }
    void MyClass::otherfunc( int arg )
    {
        TRACE(TRACE) << "MyClass::otherfunc" << "arg" << arg;
        LOG() << "Message";
    }

The output looks like this.

    T1 MyClass::MyFunc()
    T1 {
    T1     MyClass::otherfunc() arg 1
    T1     {
    T1         Message
    T1     }
    T1 }

For each new thread seen, the number is incremented (eg. T2, T3, etc.).

Macro Documentation

LOG ()

Use this macro like qDebug() and the output will be indented.

TRACE ( CATEGORY )

Register the logging category to use (TRACE if CATEGORY is null). This statement must appear before calls to LOG() so that indenting happens correctly. See <qtopiadesktoplog.h> for the available categories.

WARNING ()

Use this macro like qWarning() and the output will be indented. Note that calls to WARNING() cannot be turned off like calls to LOG().