如何在qqlscene(或qmlviewer5)上使用.qml上的Qt Quick 2扩展插件

Question

我在QtCreator中使用项目模板"Libraries/Qt Quick 2 Extension Plugin"创建了一个测试插件作为Qt5/QML共享库.我的开发环境是使用Qt-5.0.0和QtCreator-2.6的linux(详细信息在底部附加).

源文件(在要点上):https://gist.github.com/4467883

源文件是默认生成的,没有任何更改.项目名称为"无标题",uri为"com.mycompany.mycomponents",对象类名为"MyItem"."/ tmp/untitled"中的源文件作为SRCDIR.

并将其构建为输出库文件"libuntitled.so","qmldir"和"/ tmp/untitled-build"中的一些目标文件作为DESTDIR.

$ ls /tmp/untitled-build
Makefile  libuntitled.so  moc_myitem.cpp 
moc_myitem.o  moc_untitled_plugin.cpp  moc_untitled_plugin.o  myitem.o
qmldir  untitled_plugin.o

但是,我不能使用 "/tmp/test/test.qml"中的库作为qmlscene命令的测试QML源.

$ mkdir /tmp/test; cd /tmp/test
$ vim test.qml

"test.qml"(在要点上):https://gist.github.com/4474422

$ qmlscene test.qml

它失败了,QML_IMPORT_TRACE日志是:

QQmlImportDatabase::addImportPath: "/usr/lib64/qt5/qml"
QQmlImportDatabase::addImportPath: "/usr/bin"
QQmlImports(file:///tmp/test/test.qml)::addImplicitImport
QQmlImports(file:///tmp/test/test.qml)::addLibraryImport: "QtQuick" 2.0 as ""
QQmlImports(file:///tmp/test/test.qml)::importExtension: loaded "/usr/lib64/qt5/qml/QtQuick.2/qmldir"
QQmlImportDatabase::importPlugin: "QtQuick" from "/usr/lib64/qt5/qml/QtQuick.2/libqtquick2plugin.so"
file:///tmp/test/test.qml:2 module "com.mycompany.mycomponents" is not installed

并尝试"-I"选项:

$ qmlscene test.qml -I /tmp/untitled-build

那也失败了.日志是:

QQmlImportDatabase::addImportPath: "/usr/lib64/qt5/qml"
QQmlImportDatabase::addImportPath: "/usr/bin"
QQmlImportDatabase::addImportPath: "/tmp/untitled-build"
QQmlImports(file:///tmp/test/test.qml)::addImplicitImport
QQmlImports(file:///tmp/test/test.qml)::addLibraryImport: "QtQuick" 2.0 as ""
QQmlImports(file:///tmp/test/test.qml)::importExtension: loaded "/usr/lib64/qt5/qml/QtQuick.2/qmldir"
QQmlImportDatabase::importPlugin: "QtQuick" from "/usr/lib64/qt5/qml/QtQuick.2/libqtquick2plugin.so"
file:///tmp/test/test.qml:2 module "com.mycompany.mycomponents" is not installed

并尝试使用"/ tmp/test/qmldir":

$ vim /tmp/test/qmldir

"tmp/test/qmldir"(在要点上):https://gist.github.com/4474497

那是失败的.日志:

QQmlImportDatabase::addImportPath: "/usr/lib64/qt5/qml"
QQmlImportDatabase::addImportPath: "/usr/bin"
QQmlImports(file:///tmp/test/test.qml)::addImplicitImport
QQmlImports(file:///tmp/test/test.qml)::importExtension: loaded "/tmp/test/qmldir"
QQmlImportDatabase::importPlugin: ".tmp.test" from "/tmp/untitled-build/libuntitled.so"
Module '.tmp.test' does not contain a module identifier directive - it cannot be protected from external registrations.
QQmlImports(file:///tmp/test/test.qml)::addLibraryImport: "QtQuick" 2.0 as ""
QQmlImports(file:///tmp/test/test.qml)::importExtension: loaded "/usr/lib64/qt5/qml/QtQuick.2/qmldir"
QQmlImportDatabase::importPlugin: "QtQuick" from "/usr/lib64/qt5/qml/QtQuick.2/libqtquick2plugin.so"
file:///tmp/test/test.qml:2 module "com.mycompany.mycomponents" is not installed

如何在qmlscene(或qmlviewer5)的测试.qml("/ tmp/test.qml")中使用库("/ tmp/untitled-build/libuntitled.so")？

环境细节(基于openSUSE-12.2):

$ uname -a
Linux LH-MAIN 3.4.11-2.16-desktop #1 SMP PREEMPT Wed Sep 26 17:05:00 UTC 2012 (259fc87) x86_64 x86_64 x86_64 GNU/Linux
$ g++ --version | head -n1
g++ (SUSE Linux) 4.7.1 20120723 [gcc-4_7-branch revision 189773]
$ qmake -v            
QMake version 3.0
Using Qt version 5.0.0 in /usr/lib64
$ qtcreator -version 2>&1 >/dev/null | grep "^[^ ].*" | head -n1
Qt Creator 2.6.1 based on Qt 5.0.0
$ qmlviewer5 -v    
Qml debugging is enabled. Only use this in a safe environment!
Qt QML Viewer version 5.0.0

参考文献:

1. http://doc-snapshot.qt-project.org/5.0/qtcore/plugins-howto.html
2. http://doc-snapshot.qt-project.org/5.0/qtcore/qtplugin.html
3. http://qt-project.org/doc/qt-5.0/qtqml/qtqml-modules-qmldir.html
4. http://qt-project.org/doc/qt-5.0/qtqml/examples-quick-tutorials-extending-chapter6-plugins.html

Answer 1

尝试将您的文件plugin.so和qmldir文件放在一个文件夹中，例如：

- myproject
    - imports
        - com
            - mycompany
                - mycomponents
                    - libuntitled.so
                    - qmldir

然后将imports目录添加到环境变量中QML2_IMPORT_PATH。 export QML2_IMPORT_PATH=/path/to/myproject/imports 这在我的 Linux 机器上对我有用。