Category Archives: QT

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02
12
24
 2 Comments

How I fixed wrong colors in my QML app on Android

Posted by | QML, QT |

I removed android:theme from AndroidManifest.xml:

<activity android:name="net.geographx.MainActivity"
    android:configChanges="orientation|uiMode|screenLayout|screenSize|smallestScreenSize|layoutDirection|locale|fontScale|keyboard|keyboardHidden|navigation|mcc|mnc|density"
    android:label="@string/app_name"
    android:theme="@style/AppTheme"
    android:launchMode="singleTask"
    android:screenOrientation="portrait"
    android:exported="true">
    <!-- Splash screen -->
    <meta-data android:name="android.app.splash_screen_drawable" android:resource="@drawable/splash"/>
    <!-- Splash screen -->
(more…)
23
10
24
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Make QML menu width fit the content

Posted by | QML, QT |

Found an implementation here and added two pixels:

import QtQuick
import QtQuick.Controls
import QtQuick.Layouts

Menu {
    width: {
        var result = 0;
        var padding = 0;
        for (var i = 0; i < count; ++i) {
            var item = itemAt(i);
            result = Math.max(item.contentItem.implicitWidth, result);
            padding = Math.max(item.padding, padding);
        }
        // It looks like two pixels are missing to remove the ellipsis.
        // My first idea was that it is leftInset + rightInset, but it does not work.
        var missing = 2;
        return result + padding * 2 + missing;
    }
}
(more…)
25
09
24
 5 Comments

Examples of C++/Objective-C interop

Posted by | Objective C, QT |

From QT’s Purchasing:

//SKProductsRequestDelegate
-(void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response
{
    NSArray<SKProduct *> *products = response.products;
    SKProduct *product = [products count] == 1 ? [[products firstObject] retain] : nil;

    if (product == nil) {
        //Invalid product ID
        NSString *invalidId = [response.invalidProductIdentifiers firstObject];
        QMetaObject::invokeMethod(backend, "registerQueryFailure", Qt::AutoConnection, Q_ARG(QString, QString::fromNSString(invalidId)));
    } else {
        //Valid product query
        //Create a IosInAppPurchaseProduct
        IosInAppPurchaseProduct *validProduct = new IosInAppPurchaseProduct(product, backend->productTypeForProductId(QString::fromNSString([product productIdentifier])));
        if (validProduct->thread() != backend->thread()) {
            validProduct->moveToThread(backend->thread());
            QMetaObject::invokeMethod(backend, "setParentToBackend", Qt::AutoConnection, Q_ARG(QObject*, validProduct));
        }
        QMetaObject::invokeMethod(backend, "registerProduct", Qt::AutoConnection, Q_ARG(IosInAppPurchaseProduct*, validProduct));
    }

    [request release];
}
(more…)
09
08
24
 1 Comment

Using Swift in a QT6 app

Posted by | QT, Swift |

I simply opened arboreus_examples/qt6/CMake/UsingSwift/UsingSwift_v3/CMakeLists.txt in QT Creator and was able to build it and run.

In its main.cpp it creates a Swift wrapper and calls method:

ASwift* oSwift = new ASwift(&oEngine);
oSwift->mInit();
_A_DEBUG << oSwift->mString();
(more…)
02
07
24
 4 Comments

“Null object reference” exceptions on Android 14 in a QT app

Posted by | Android, QT |

When I switched to QT 6.7.2 and set QT_ANDROID_TARGET_SDK_VERSION "34" (that is Android 14) my QT app started to crash with the following stack traces:

On google Pixel 5 64-bit only 1080x2340 Android 14 (SDK 34) arm64-v8a:

Exception java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference
  at android.os.Parcel.createExceptionOrNull (Parcel.java:3189)
  at android.os.Parcel.createException (Parcel.java:3167)
  at android.os.Parcel.readException (Parcel.java:3150)
  at android.database.DatabaseUtils.readExceptionFromParcel (DatabaseUtils.java:202)
  at android.database.DatabaseUtils.readExceptionFromParcel (DatabaseUtils.java:154)
  at android.content.ContentProviderProxy.call (ContentProviderNative.java:764)
  at android.content.ContentResolver.call (ContentResolver.java:2466)
  at android.content.ContentResolver.call (ContentResolver.java:2446)
  at ekfr.a (:com.google.android.gms@242013038@24.20.13 (190400-633713831):29)
  at com.google.android.gms.wallet.intentoperation.setupwizard.PaymentsSetupWizardAccountChangeIntentOperation.onHandleIntent (:com.google.android.gms@242013038@24.20.13 (190400-633713831):252)
  at com.google.android.chimera.IntentOperation.onHandleIntent (:com.google.android.gms@242013038@24.20.13 (190400-633713831):2)
  at ajdw.onHandleIntent (:com.google.android.gms@242013038@24.20.13 (190400-633713831):8)
  at pbh.run (:com.google.android.gms@242013038@24.20.13 (190400-633713831):70)
  at pbg.run (:com.google.android.gms@242013038@24.20.13 (190400-633713831):152)
  at elbx.run (:com.google.android.gms@242013038@24.20.13 (190400-633713831):21)
  at java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1145)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:644)
  at java.lang.Thread.run (Thread.java:1012)
(more…)
30
06
24
 2 Comments

QT stopped compiling with QT_NO_EXCEPTIONS

Posted by | QT |

QT 6.7.2 failed to build with QT_NO_EXCEPTIONS for Android with the following errors:

C:/dev/repos/qt-everywhere-src-6.7.2/qtbase/src/corelib/io/qprocess_unix.cpp:889:29: error: use of undeclared identifier 'e'
        failChildProcess(d, e.what(), FakeErrnoForThrow);
                            ^
C:/dev/repos/qt-everywhere-src-6.7.2/qtbase/src/corelib/io/qprocess_unix.cpp:890:7: error: expected expression
    } QT_CATCH (...) {
      ^
C:/dev/repos/qt-everywhere-src-6.7.2/qtbase/src/corelib/global/qexceptionhandling.h:28:23: note: expanded from macro 'QT_CATCH'
#  define QT_CATCH(A) else
                      ^
2 errors generated.
[673/5992] Building CXX object qtbase/src/corelib/CMakeFiles/Core.dir/itemmodels/qabstractitemmodel.cpp.o
ninja: build stopped: subcommand failed.
(more…)
03
05
24
 9 Comments

Building Lines Game for MacOS and iOS

Posted by | iOS, Mac OS X, QT |

To build my app for iOS I tried to run CMake from the command line without QT Creator:

cmake -S /Users/admin/dev/repos/examples/src/LinesGame/LinesGameQt -B . -DCMAKE_GENERATOR:STRING=Xcode \
  -DCMAKE_PROJECT_INCLUDE_BEFORE:FILEPATH=./.qtc/package-manager/auto-setup.cmake -DQT_QMAKE_EXECUTABLE:FILEPATH=/Users/admin/dev/libs/QT6/release/iOS/bin/qmake6 \
  -DCMAKE_PREFIX_PATH:PATH=/Users/admin/dev/libs/QT6/release/iOS \
  -DCMAKE_C_COMPILER:FILEPATH=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang \
  -DCMAKE_CXX_COMPILER:FILEPATH=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ \
  -DCMAKE_TOOLCHAIN_FILE:FILEPATH=/Users/admin/dev/libs/QT6/release/iOS/lib/cmake/Qt6/qt.toolchain.cmake \
  -DCMAKE_OSX_ARCHITECTURES:STRING=arm64 -DCMAKE_OSX_SYSROOT:STRING=iphoneos -DCMAKE_CXX_FLAGS_INIT:STRING= \
  -DCMAKE_XCODE_ATTRIBUTE_DEVELOPMENT_TEAM:STRING=XXXXXXX
(more…)
01
05
24
 14 Comments

Publishing MacOS QT app in Apple App Store

Posted by | Mac OS X, QT |

First I set CMake generator to XCode in QT Creator Kits settings page:

(more…)
26
04
24
 2 Comments

Publishing iOS QT app in Apple App Store

Posted by | iOS, Mac OS X, QT |

I downloaded provisioning profiles with XCode:

(more…)
20
04
24
 7 Comments

Building QT6.7 on MacOS Sonoma

Posted by | Mac OS X, QT | Tagged |

I installed MacOS Sonoma on HyperV, installed XCode and used the following commands to check compiler and SDK versions:

admin@son ~ % xcode-select -print-path
/Applications/Xcode.app/Contents/Developer
admin@son ~ %  xcrun -sdk macosx -find clang
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang
admin@son ~ % clang --version
Apple clang version 15.0.0 (clang-1500.3.9.4)
Target: x86_64-apple-darwin23.4.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
admin@son ~ % xcrun -sdk macosx --show-sdk-path
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.4.sdk
(more…)
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