undefined reference to

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@#include "video.h"
#include "networkaccess.h"
#include <QtNetwork>
#include "videodefinition.h"

namespace The {
NetworkAccess* http();
}

Video::Video() : m_duration(0),
m_viewCount(-1),
definitionCode(0),
elIndex(0),
loadingStreamUrl(false)
{ }

void Video::preloadThumbnail() {
if (m_thumbnailUrls.isEmpty()) return;
QObject *reply = The::http()->get(m_thumbnailUrls.first());
connect(reply, SIGNAL(data(QByteArray)), SLOT(setThumbnail(QByteArray)));
}
@

Whenever i use the above code im getting the following error
./release\video.o:video.cpp:(.text+0x49): undefined reference to `The::http()'

Can someone help me on this..Thanks in advance.

vsorokin

@namespace The {
NetworkAccess* http();
}@

You declare this function, but nowhere implemented it.

? Offline

[quote author="sathism" date="1293777356"]@
namespace The {
NetworkAccess* http();
}

Video::Video() : m_duration(0),
m_viewCount(-1),
definitionCode(0),
elIndex(0),
loadingStreamUrl(false)
{ }
@

[/quote]

Also what does this lines do. Are they inside any function.

? Offline

[quote author="QtK" date="1293783653"]
[quote author="sathism" date="1293777356"]@
namespace The {
NetworkAccess* http();
}

Video::Video() : m_duration(0),
m_viewCount(-1),
definitionCode(0),
elIndex(0),
loadingStreamUrl(false)
{ }
@

[/quote]

Also what does this lines do. Are they inside any function.
[/quote]

I think that this is a construct function with list of initialization(i don't sure how it's named in english) from class Video who is in video.h file

? Offline

[quote author="BlackDante" date="1293791754"]
[quote author="QtK" date="1293783653"]
[quote author="sathism" date="1293777356"]@
namespace The {
NetworkAccess* http();
}

Video::Video() : m_duration(0),
m_viewCount(-1),
definitionCode(0),
elIndex(0),
loadingStreamUrl(false)
{ }
@

[/quote]

Also what does this lines do. Are they inside any function.
[/quote]

I think that this is a construct function with list of initialization(i don't sure how it's named in english) from class Video who is in video.h file [/quote]

Oh no it seems I am gone blind :) I didn't notice this Video::Video() properly.

Thank you.

vsorokin

QtK, BlackDante are right, It's implementation empty constructor with list of initialization values.

? Offline

[quote author="Vass" date="1293792450"]QtK, BlackDante are right, It's implementation empty constructor with list of initialization values.[/quote]

Yes, As mentioned above I had not noticed it properly. Don't know how I missed it.

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This is no problem, sometimes everyone can miss somethink. :) it's in human nature :)

giesbert

[quote author="Vass" date="1293779836"]@namespace The {
NetworkAccess* http();
}@

You declare this function, but nowhere implemented it.[/quote]

This should be the problem. Something like this should solve it:

@
#include "video.h"
#include "networkaccess.h"
#include <QtNetwork>
#include "videodefinition.h"

namespace The {
NetworkAccess* http()
{
return 0;
}
}

Video::Video() :
m_duration(0),
m_viewCount(-1),
definitionCode(0),
elIndex(0),
loadingStreamUrl(false)
{ }

void Video::preloadThumbnail()
{
if (m_thumbnailUrls.isEmpty()) return;
QObject *reply = The::http()->get(m_thumbnailUrls.first());
connect(reply, SIGNAL(data(QByteArray)), SLOT(setThumbnail(QByteArray)));
}
@

Zlatomir

Please ignore if you actually want the http to be a function
But i have a feeling that the OP didn't want a function there, so here is my explanation about this line of code:
@NetworkAccess* http();@
The C++ compiler threats all the "things" that might be a function declaration, like there really are function declaration, so the compiler thinks: NetworkAccess pointer is the return type, http is the function name and () the function has no parameters.

If you want an object on the stack you will write this:
@NetworkAccess http; //no pointer and no () for default constructor
@
If you want/need to use pointers, you need two objects: the pointer and the object itself, that is done usually by using the operator new to allocate memory and call the constructor of the object (or using the address-of operator to take the address of a previously created object), code (for operator new) looks like this:
@NetworkAccess* http = new NetworkAccess(); //here you can have () for default constructor ;)
@

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Thanks for all your valuable replies.
@Gerolf
I will try your fix ..

vsorokin

[quote author="Gerolf" date="1293806305"]
This should be the problem. Something like this should solve it:

@
#include "video.h"
#include "networkaccess.h"
#include <QtNetwork>
#include "videodefinition.h"

namespace The {
NetworkAccess* http()
{
return 0;
}
}

Video::Video() :
m_duration(0),
m_viewCount(-1),
definitionCode(0),
elIndex(0),
loadingStreamUrl(false)
{ }

void Video::preloadThumbnail()
{
if (m_thumbnailUrls.isEmpty()) return;
QObject *reply = The::http()->get(m_thumbnailUrls.first());
connect(reply, SIGNAL(data(QByteArray)), SLOT(setThumbnail(QByteArray)));
}
@[/quote]

Gerolf, you code will be crashed on line 25:
@ QObject *reply = The::http()->get(m_thumbnailUrls.first());@
because The::http() return null pointer.

giesbert

It was to show, what is missing. I didn't implement the method, that's something you have to do :-)

vsorokin

Gerolf I understood :) I just saw sathism will try your fix, and warned about problem.