Question

当我编译包含libechonest的c ++文件时，我在连接QtCore和QtNetwork库时遇到问题。具体做法是：

alexcannon$ gcc -g -Wall -o geoEchoNest geoEchoNest.cc -lechonest -lQtCore -lQtNetwork
In file included from geoEchoNest.c:6:
In file included from /usr/local/include/echonest/Artist.h:22:
In file included from /usr/local/include/echonest/ArtistTypes.h:21:
/usr/local/include/echonest/Util.h:22:10: fatal error: 'QDebug' file not found
#include <QDebug>
         ^
1 error generated.

我甚至尝试添加-L/usr/local/lib/QtCore.framework/以防QtCore不在“标准路径”中（无论这意味着什么）：

alexcannon$ gcc -g -Wall -o geoEchoNest geoEchoNest.cc -lechonest -    L/usr/local/lib/QtCore.framework/ -lQtCore -lQtNetwork

......结果相同。我在这做错了什么？我通过README中的说明在安装libechonest之前在/ usr / local /以及QJSON中安装了Qt：

alexcannon$ cat README 

libechonest
===========

libechonest is a collection of C++/Qt classes designed to make a developer's life
easy when trying to use the APIs provided by The Echo Nest. More information about
the APIs can be found here:

http://developer.echonest.com/docs/v4/

libechonest is developed by Leo Franchi (lfranchi@kde.org), and is available at KDE's projects page,
  https://projects.kde.org/projects/playground/libs/libechonest .
  Review request are accepted at http://git.reviewboard.kde.org under the compenent libechonest, and
   API comments, and more are appreciated.

Dependencies
============

    * Qt, only the QtCore, QtNetwork and QtTest modules (www.qtsoftware.com)
    * CMake, Kitware's open source build system (http://cmake.org)
    * QJson (http://qjson.sourceforge.net/).

Installing
==========

mkdir build
cd build
cmake -DCMAKE_INSTALL_PREFIX=/path/to/desired/install ..
make
make install

Using libechonest
===============
The c++ API is meant to be as close to the Echo Nest API as possible. All Echo Nest
API functions have been copied into their respective c++ equivalents, and string values
converted to enums where reasonable.

See the unit tests in tests/ for examples on how to use the classes.

You need an API key from http://developer.echonest.com to use this library. Set your API key
 with Echonest::Config::instance()->setAPIKey().

You can also set your own custom QNetworkAccessManager-derived class with Config::setNetworkAccessManager();

Your link line needs to include the following:

    -lechonest -lQtCore -lQtNetwork

Thank you for tuning in!

leo

-------
This README, and libechonest in general, is inspired by Max Howell's liblastfm,
 at http://www.github.com/mxcl/liblastfm.

提前感谢您的帮助！

Answer 1

添加QtCore，QtNetwork和libechonest的标头。您只为链接器添加了库（-L和-l（小写L）），但您错过了添加标题（使用-I（大写i））。

libEchoNest C ++ QtCore库链接问题

1 个答案: