Program loops at one line

[Platoon]

Hi i have a quite strange problem....this is the code

void ClassC::protocolList(QList<Protocol*> **list)
{
    (*list) = this->mProtocolList;
}

void ClassC::protocolList(QList<Protocol*> **list)
{
    (*list) = this->mProtocolList;
}

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When i debug this assignment it doesn't go further.....it remains at this line

Can anyone tell me why?

[wysota]

Can you elaborate how you debug and how it "remains at this line"?

[Platoon]

I set a breakpoint one line before and the program stops as expected then i press step over and the program does one step. Now the debugger is at my problem assignment line....and when i press step over again it does not move on......in detail: the arrow which indicates at whic line the debugger is standing disappears for a second and the reappears at the same line....instead of appearing at the next line


i hope i explained my problem in a way you can understand

[jano_alex_es]

can you tell us which compiler are you using?

[wysota]

Change your code to the following:

void ClassC::protocolList(QList<Protocol*> **list)
{
    qDebug() << Q_FUNC_INFO << "Enter";
    (*list) = this->mProtocolList;
    qDebug() << Q_FUNC_INFO << "Leave";
}

void ClassC::protocolList(QList<Protocol*> **list)
{
    qDebug() << Q_FUNC_INFO << "Enter";
    (*list) = this->mProtocolList;
    qDebug() << Q_FUNC_INFO << "Leave";
}

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And run your program without a debugger. See if the statements get printed properly. Maybe there is some problem with the debugger itself (Qt Creator is known to work not very well with MSVC debugger).

[Platoon]

When program reaches the line it crashes and windows says: ****.exe doesnt work anymore

and debug output is:
Starte D:\HTL\DA\*****\02_Software\01_Program\****\debug\ ****.exe...
void ClassC:rotocolList(QList<Protocol*>**) Enter

D:\HTL\DA\*****02_Software\01_Program\****\debug\* ****.exe beendet, Rückgabewert -1073741819

I am using MinGW
GNU Make 3.81

[wysota]

In that case no wonder the debugger doesn't want to continue execution...

Your code is simply invalid - I'd say you are passing an invalid pointer into this function. Why are you passing a pointer to a pointer to a list?

[Platoon]

OK...now i have it!

You where right wysota....it was an invalid pointer because somewhere in my code i initialised a local variable of the type ClassC with the same name.....after changing it to the real variable it all worked fine....i hope you understand what i mean ^^

Thanks for the tipp