{"id":388,"date":"2011-11-09T10:39:12","date_gmt":"2011-11-09T17:39:12","guid":{"rendered":"http:\/\/www.lothlorien.com\/kf6gpe\/?p=388"},"modified":"2012-01-02T15:17:27","modified_gmt":"2012-01-02T22:17:27","slug":"deploying-qt-quick-applications-that-rely-on-qt-mobility-on-windows","status":"publish","type":"post","link":"https:\/\/www.lothlorien.com\/kf6gpe\/deploying-qt-quick-applications-that-rely-on-qt-mobility-on-windows\/","title":{"rendered":"Deploying Qt Quick Applications that rely on Qt Mobility on Windows…"},"content":{"rendered":"

Whew! Some things seem to take forever<\/em> for me to figure out!<\/p>\n

Here’s the scenario: we’re working on a Qt Quick (QML and C++) application at the lab to run on Microsoft Windows. We’d like to deploy the app to a bunch of study participants to use for a week or so. It’s obviously not practical for me to go around and set everybody up with Qt, Qt Mobility, and build our app. (Especially not this app; we’re using the Qt 4.8 prerelease at this point!). So we need to build a Windows installer that includes the Qt DLLs, our app and its QML, and the Qt Mobility plugins we’re using. We’re using Qt Mobility in our QML — so we need to include the Qt Mobility plugins for Qt Quick, not just the Qt Mobility libraries.<\/p>\n

Packaging a Qt application for Windows is straightforward — just follow these<\/a> instructions for packaging as a shared library. But what about the Qt Quick plugins for Qt Mobility we need?<\/p>\n

Well, Qt Quick supports modules for that, as described here<\/a>. In fact, if your application required QtWebKit’s Qt Quick plugin, you’d create a QtWebKit directory, stick a qmldir<\/code> file with the line
\n
\nplugin QtWebKit
\n<\/code>
\ncopy qtwebkitplugin.dll<\/code> into the directory you made and Bob’s your uncle!<\/p>\n

We use QtMultimediaKit, so at first I created a QtMultimediaKit<\/code> directory, created a qmldir<\/code> file in that directory, and copied QtMultimediaKit1.dll<\/code> from my Qt Mobility build output directory to the QtMultimediaKit<\/code> directory I’d created.<\/p>\n

No luck — in fact, the app just launches and shows nothing. (To add insult to injury, my app uses Qt’s support for Open GL, so not only did I not get the black screen characteristic of a QML error, but I got junk in the application window and no errors on the console.)<\/p>\n

Turns out that QtMultimediaKit1.dll<\/code> goes in the same directory as the application, and the declarative plugin file is somewhere else! If you look in the plugins<\/code> directory, you’ll see a declarative<\/code> directory, and the actual Qt Quick declarative plugin you’re looking for is in there! In my case, I needed to copy plugins\/declarative\/multimedia\/release\/declarative_multimedia.dll<\/code> to a new directory QtMultimediaKit<\/code>, create a single qmldir<\/code> file that read
\n
\nplugin declarative_multimedia
\n<\/code>
\nand put that adjacent to my application executable.<\/p>\n

So, the resulting files and directories for me look something like:
\n
\nimageformats\/qgif4.dll
\nimageformats\/qjpeg.dll
\nQtMultimediaKit\/declarative_multimedia.dll
\nQtMultimediaKit\/qmldir
\nmsvcr90.dll
\nQtCore4.dll
\nQtDeclarative4.dll
\nQtGui4.dll
\nQtMultimedia4.dll
\nQtMultimediaKit1.dll
\nQtNetwork4.dll
\nQtOpenGL4.dll
\nQtScript4.dll
\nQtSql4,dll
\nQtXml4.dll
\nQtXmlPatterns4.dll
\nmyapplication.exe
\n<\/code><\/p>\n

Now off to learn how to make a Windows installer. I think I’ll try Inno Setup<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Whew! Some things seem to take forever for me to figure out! Here’s the scenario: we’re working on a Qt Quick (QML and C++) application at the lab to run on Microsoft Windows. We’d like to deploy the app to a bunch of study participants to use for a week or so. It’s obviously not … Continue reading Deploying Qt Quick Applications that rely on Qt Mobility on Windows…<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10,9],"tags":[21,20,22,23],"class_list":["post-388","post","type-post","status-publish","format-standard","hentry","category-mobile","category-programming","tag-qml","tag-qt","tag-qt-quick","tag-windows"],"_links":{"self":[{"href":"https:\/\/www.lothlorien.com\/kf6gpe\/wp-json\/wp\/v2\/posts\/388","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.lothlorien.com\/kf6gpe\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lothlorien.com\/kf6gpe\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lothlorien.com\/kf6gpe\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lothlorien.com\/kf6gpe\/wp-json\/wp\/v2\/comments?post=388"}],"version-history":[{"count":6,"href":"https:\/\/www.lothlorien.com\/kf6gpe\/wp-json\/wp\/v2\/posts\/388\/revisions"}],"predecessor-version":[{"id":395,"href":"https:\/\/www.lothlorien.com\/kf6gpe\/wp-json\/wp\/v2\/posts\/388\/revisions\/395"}],"wp:attachment":[{"href":"https:\/\/www.lothlorien.com\/kf6gpe\/wp-json\/wp\/v2\/media?parent=388"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lothlorien.com\/kf6gpe\/wp-json\/wp\/v2\/categories?post=388"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lothlorien.com\/kf6gpe\/wp-json\/wp\/v2\/tags?post=388"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}