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Problem with Qt application on MacOS Retina display
Standard Qt application on retina display looks ugly. Fuzzy fonts and images. This is how ORM Designer originaly looks on Retina: ORM Designer on Retina before optimizations Improve font autoscaling...
View ArticleQt stylesheet guidance
Style sheets Qt Style sheets overview Qt Style sheet syntax Customizing Qt widgets using style sheet (boxmodel, draw info) Qt Style sheet reference (all widgets style properties) Qt Style sheet...
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How to sign your Qt Mac OS X App for Gatekeeper
Starting from Mac os 10.8 apple applications requires certificate. Without that certificate (or without additional system tweaks described here on our product support page:...
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GetTickCount64 problem on WindowsXP
The procedure entry point GetTickCount64 could not be located in the dynamic link library KERNEL32.dll Today we received report from one of our customers about problem with our ORM Designer on...
View ArticleVS2010 always rebuilding moc files on Qt
My VS2010 on every build always recreate all .moc files and associated .cpp files. Problem was in incredibuild clausule during compilation of my Qt libraries. <AdditionalInputs...
View ArticleQt app crash on mac when executed with parameters
Our reporting tool occasional crashed on MacOs when was executed with several command line params. Command looked like this: /app-path/OrmDesigner2 -crash-report -dump-directory...
View ArticleHow to create .pdb files also for Release version of Qt library
For debugging purposes it’s a good idea to keep .pdb files also for release version of your libraries. Unfortunately in default configuration Qt library doesn’t generate .pdb files. It’s a not big...
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Qt5 application crashed with error 0xc0000005
This is very interesting crash and I think it should be considered as Qt bug. This problem arise only under very special circumstances. But one after another. You will identify this problem when your...
View ArticleQt5 application hangs-up when QNetworkAccessManager and QEventLoop is used on...
To be more specific, problem occurs only in very specific circumstances. It’s in situation, when application is compiled as console-app and it’s compiled on Mac OS X version older than 10.9: CONFIG -=...
View ArticleQt Creator debugger doesn’t work after last MacOS 10.9.4 update
Problem is caused by lldbbridge.py file, where it’s necessary to update few lines. After that, debugger will work like charm. Qt Creator bug report lldbbridge.py patch
View ArticleQDialog::reject can be invoked multiple times
When user use ESC to close the dialog and press it very quickly two or more times in a row, QDialog::reject can be invoked also multiple times. This is very dangerous and unpredictable because in case...
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Crash in QTreeWidget / QTreeView index mapping on Mac OSX 10.10 part II
As mentioned in the first part of this article, the workaround with focus unfortunately didn’t work. In some cases application is still crashing. So after next hours of debugging and unsuccessful...
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Crash in QTreeWidget / QTreeView index mapping on Mac OSX 10.10 part III
So, one more attempt. Previous articles (part1, part2) mentioned possible solutions to fix crash insinde the QTreeWidget and QAccessibleTableCell. Unfortunately, deselecting current item still doesn’t...
View ArticleQt – This application failed to start because it could not find or load the...
This application failed to start because it could not find or load the Qt platform plugin “windows”. As temporary fix, set following environment variable in VS...
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Qt 5.5.0 an Qt 5.5.1, QWebEngine, QtWebKit and ICU
Notes about compiling QtWebEngine (instead of QtWebkit) together with Qt 5.5.1 Qt 5.5.0 configure switches for ICU: configure \ -icu \ -I Q:\SharedLibraries\icu4c-51_1\icu\include \ -L...
View ArticleQml & QtQuick
Qt documentation QML Data Models, Qml Model-view QML Data models real usage (blogpost) QtQuick examples (official Qt site) – lot of examples! QtQuick mouse-keyboard events handling QtQuick...
View ArticleDebugging QML application
Batches, clip, changes and overdraw SET QSG_VISUALIZE=batches or SET QSG_VISUALIZE=clip or SET QSG_VISUALIZE=changes or SET QSG_VISUALIZE=overdraw qmlviewer test.qml Links:...
View ArticleQML Notes
Sources https://swanson.kdab.com/owncloud/index.php/s/TY9jG2D70ODOjUi F5 for instant reload, class UltraView : public QQuickView { protected: void keyPressEvent(QKeyEvent*event) override {...
View ArticleMicrosoft defender false positive
Scan library/executable against several AVs: https://www.virustotal.com/gui/home Report false-positive to Microsoft AV: https://www.microsoft.com/en-us/wdsi Report false positive & other info...
View ArticleCould not find the Qt platform plugin “xcb” in “”
Full error code: Library searching paths: - /home/dev/dev/SharedLibraries/qt/plugins qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in "" This application failed to start because no Qt...
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