[Qt-interest] Passing QList<QStringList> as arguments

[Ellen Kestrel]

My experience is that with the container classes like QList, you need the
include in the actual header file and not just the class implementation
file, if you have function prototypes or members listed in the header that
involve the container class.  Just declaring "class QList<QStringList>"
isn't good enough.  Also, you appear to have declared it as
"QList<QStringList*>" when what you are actually using is a
QList<QStringList>* (a pointer to a QList rather than a QList of pointers).

On Tue, Aug 24, 2010 at 2:30 PM, David Villalobos Cambronero <
david.villalobos.c at gmail.com> wrote:

> Thanks for the interest Eric, here is the info.
>
> Header file
>
> ------------------------------------------------------------------------------------------------------------------------
> #ifndef MYSQLTOPCLASS_H
> #define MYSQLTOPCLASS_H
>
> class QList<QStringList *>;
>
> class mysqlTopClass
> {
> public:
>     mysqlTopClass();
>     QString outputAsTable(const QStringList *headers, const
> QList<QStringList> *rows);
> };
>
> #endif // MYSQLTOPCLASS_H
>
> ------------------------------------------------------------------------------------------------------------------------
>
> Class file
>
> ------------------------------------------------------------------------------------------------------------------------
> #include <QStringList>
> #include <QList>
>
> #include "mysqltopclass.h"
>
> mysqlTopClass::mysqlTopClass()
> {
> }
>
> QString mysqlTopClass::outputAsTable(const QStringList *headers, const
> QList<QStringList> *rows)
> {
>   return "Gelow";
> }
>
> ------------------------------------------------------------------------------------------------------------------------
>
> Here is where I use it
>
> ------------------------------------------------------------------------------------------------------------------------
>
> #include <QtGui>
>
> #include "serverInformation.h"
> #include "mysqlClasses/mysql.h"
> #include "ui_dialog.h"
>
> serverInformation::serverInformation()
> {
>   mysql *conn = new mysql;
>
>   QStringList *headers = new QStringList("-V,(**.)");
>   headers->append("David");
>   headers->append("Vil");
>   headers->append("Vil");
>   QList<QStringList> *rows = new QList<QStringList *>;
>   rows->append(new QStringList("David V"));
>   QPlainTextEdit *replicationStatus = new
> QPlainTextEdit(conn->outputAsTable(headers, rows));
>   replicationStatus->setFont(font);
>   replicationStatus->setWordWrapMode(QTextOption::NoWrap);
>   addTab(replicationStatus, QIcon(":/images/images/16/Replication.png"),
> tr("Replication Status"));
> }
>
>
> Hope it helps. If not, I can send you a copy of my project.
>
> ---
> David
>
>
> On Tue, Aug 24, 2010 at 13:13, Eric Clark <eclark at ara.com> wrote:
>
>> David,
>>
>>
>>
>> You mentioned that this is a function that you are passing the list to
>> correct? Can you show us the declaration of the function, and the definition
>> and tell us where the includes are at? For example, are the includes only in
>> the cpp file and the declaration of the function is in the header without
>> the includes?
>>
>>
>>
>> Thanks,
>>
>> Eric
>>
>>
>>
>> *From:* qt-interest-bounces at trolltech.com [mailto:
>> qt-interest-bounces at trolltech.com] *On Behalf Of *David Villalobos
>> Cambronero
>> *Sent:* Tuesday, August 24, 2010 12:38 PM
>> *To:* Andre Somers
>> *Cc:* qt-interest at trolltech.com
>> *Subject:* Re: [Qt-interest] Passing QList<QStringList> as arguments
>>
>>
>>
>> Those are my headers:
>>
>> #include <QtGui>
>> #include <QList>
>> #include <QString>
>> #include <QStringList>
>>
>> and still got he error.
>>
>>
>> Regards
>> ---
>> David
>>
>> On Tue, Aug 24, 2010 at 11:31, Andre Somers <andre at familiesomers.nl>
>> wrote:
>>
>>  Op 24-8-2010 19:24, David Villalobos Cambronero schreef:
>>
>> > Hi all, hope you can help me.
>> >
>> > Here is the scenario:
>> >
>> > I need to pass a function a QList<QStringList> param. I take a look at
>> > the nestedlayouts example, basically it has the following lines:
>> >
>> > QList<QStringList> rows = QList<QStringList>()
>> > << (QStringList() << "Verne Nilsen" << "123")
>> > << (QStringList() << "Carlos Tang" << "77")
>> > << (QStringList() << "Bronwyn Hawcroft" << "119")
>> > << (QStringList() << "Alessandro Hanssen" << "32")
>> > << (QStringList() << "Andrew John Bakken" << "54")
>> > << (QStringList() << "Vanessa Weatherley" << "85")
>> > << (QStringList() << "Rebecca Dickens" << "17")
>> > << (QStringList() << "David Bradley" << "42")
>> > << (QStringList() << "Knut Walters" << "25")
>> > << (QStringList() << "Andrea Jones" << "34");
>> >
>> > I can run the example without any problem. But if I copy and paste
>> > these two lines in my proyect:.
>> > QList<QStringList> rows = QList<QStringList>()
>> > << (QStringList() << "Verne Nilsen" << "123");
>> >
>> > I got he followin error:
>> > error: variable ‘QList<QStringList> rows’ has initializer but
>> > incomplete type
>> > error: invalid use of incomplete type ‘class QList<QStringList>’
>> >
>> > The example and my project both uses QtGui.
>>
>> Sounds like you did not copy over the needed #include's as well. Your
>> compiler has currently no idea what a QList<QStringList> is supposed to
>> be. You need to point it to the place where it can find that.
>>
>> André
>>
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