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

Question

我在QtCreator中使用項目模板「Libraries/Qt Quick 2 Extension Plugin」創建了一個測試插件作爲Qt5/QML共享庫。我的開發環境是使用Qt-5.0.0和QtCreator-2.6的Linux（細節在底部附加）。

源文件（在GIST）：https://gist.github.com/4467883

源文件是不作任何修改產生默認。項目名稱是「untitled」，uri是「com.mycompany.mycomponents」，而Object Class-name是「MyItem」。 「/ tmp/untitled」中的源文件作爲SRCDIR。

它建立到輸出庫文件作爲「libuntitled.so」，「qmldir」和一些對象「的/ tmp /無建造」文件作爲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，我不能在 「/tmp/test/test.qml」 與qmlscene命令測試QML源使用圖書館。

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

「test.qml」（上GIST）：https://gist.github.com/4474422

$ qmlscene test.qml 

它失敗，並QML_IMPORT_TRACE日誌：

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 

並嘗試 「-I」選項：

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

也就是失敗。日誌：

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 

，並嘗試使用 「/ tmp/test目錄/ qmldir」：

$ vim /tmp/test/qmldir 

「TMP /測試/ qmldir」（上GIST）：https://gist.github.com/4474497

這是失敗 。日誌：

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 

如何使用圖書館測試.qml（ 「/ tmp目錄/ test.qml」）與qmlscene（或qmlviewer5）（ 「/ tmp目錄/無建造/ libuntitled.so」）？

環境細節（基於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 

參考文獻：

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

嘗試把你的plugin.so和qmldir文件一樣的文件夾中：

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

然後添加imports目錄到QML2_IMPORT_PATH環境變量。 export QML2_IMPORT_PATH=/path/to/myproject/imports 這在我的Linux機器上工作。