undefined reference to
-
@#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.
-
[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 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 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.
-
[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.
-
This is no problem, sometimes everyone can miss somethink. :) it's in human nature :)
-
[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)));
}
@ -
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 ;)
@ -
[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.
