UIApplication.shared.canOpenURL implements in Qt

Max Base

Hello,
We have one Qt base application then works on Android, iOS, and desktops.
We need this feature at iOS.

We want to check one application is installed or no. (We can detect it by calling canOpenUrl method or check installed applications by it's packageName)

Java code:

public static boolean isInstalled(Context context) {
 try {
 context.getPackageManager()
 .getPackageInfo("companyname.test.appname", 0);
 return true;
 } catch (PackageManager.NameNotFoundException e) {
 return false;
 }
}

And Swift code:

func isInstalled() -> Bool {
 guard let url = URL(string: "application-protcl-name://") else {
    preconditionFailure("Invalid url")
 }
 return UIApplication.shared.canOpenURL(url)
}

I want use this results to decide exit from Qml webview and send parameters to second application (By id package Name)

How we can implements this Swift code at a Qt-base (Qml) Project?

Or, We cannot calling one function from Swift when we are in cpp?

Thank you

SGaist

Hi and welcome to devnet,

You can achieve that using Objective-C++ and the same class.

Max Base

Hello Dear @SGaist, Thank you for your message,
You are an active, I did read some good reply befor in this case from you in this froum...

I know about canOpenURL method, But i don't know how to call and use it....

How we can use it? Thank you so much

Also:

Can you show me one example in this case? It's not clear for me.

SGaist

In your case, it's not as complicated as the link you found.

Change the file extension of your cpp class implementation to .mm and in the function you want to make the check call, something like:

NSURL *url = myUrl.toNSUrl();
 bool canOpen = [[NSApplication shared] canOpenUrl: url];

[edit: fixed class name typo]

Max Base

@SGaist said in UIApplication.shared.canOpenURL implements in Qt:

NSUrl

Thank you, It was a good progress for first step.
But we have error and cannot compile it.

Error:

Code of .pro file:

QT += widgets quick webview

CONFIG += c++17


DEFINES += QT_DEPRECATED_WARNINGS


LIBS += -framework Foundation


SOURCES += \
        HandleURL.mm \
        main.cpp \


RESOURCES += qml.qrc


QML_IMPORT_PATH =

QML_DESIGNER_IMPORT_PATH =

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target



contains(ANDROID_TARGET_ARCH,arm64-v8a) {
    ANDROID_ARM64 = 1
    ANDROID_EXTRA_LIBS = \
        $$PWD/openssl-1.1.1a-clang/arm64-v8a/lib/libcrypto.so \
        $$PWD/openssl-1.1.1a-clang/arm64-v8a/lib/libssl.so

            ANDROID_PACKAGE_SOURCE_DIR = \
                $$PWD/android
}

contains(ANDROID_TARGET_ARCH,armeabi-v7a) {
    ANDROID_EXTRA_LIBS = \
        $$PWD/openssl-1.1.1a-clang/armeabi-v7a/lib/libcrypto.so \
        $$PWD/openssl-1.1.1a-clang/armeabi-v7a/lib/libssl.so

    ANDROID_PACKAGE_SOURCE_DIR = \
        $$PWD/android
}




DISTFILES += \
    android/AndroidManifest.xml \
    android/build.gradle \
    android/gradle/wrapper/gradle-wrapper.jar \
    android/gradle/wrapper/gradle-wrapper.properties \
    android/gradlew \
    android/gradlew.bat \
    android/res/values/libs.xml

defineReplace(droidVersionCode) {
    segments = $$split(1, ".")
    for(segment, segments): vCode = "$$first(vCode)$$format_number($$segment, width=3 zeropad)"
    ## arm64-v8a, armeabi-v7a
    contains(ANDROID_TARGET_ARCH, arm64-v8a): \
        suffix = 1
    else:contains(ANDROID_TARGET_ARCH, armeabi-v7a): \
        suffix = 0
    return($$first(vCode)$$first(suffix))
}




ios {
   QMAKE_INFO_PLIST = ios/info.plist
}

VERSION = 1.2.3
ANDROID_VERSION_NAME = $$VERSION
ANDROID_VERSION_CODE = $$droidVersionCode($$ANDROID_VERSION_NAME)


HEADERS += \
    HandleURL.hpp

HandleURL.mm file:

#include <QDebug>
#include <QUrlQuery>
#include <QUrl>
#include <QDesktopServices>
#include "HandleURL.hpp"
#import <Foundation/NSUserNotification.h>
#import <AppKit/NSApplication.h>
#import <Foundation/Foundation.h>


void HandleURL::handleURL(const QUrl &url) {
  // parse it...
  // protclname://methodName?token=dfgdfgdfgdfg&callbackurl=https%3A%2F%2Fgoogle.test.com
  QUrlQuery query(url);
  // qDebug() << url.toString();
  // qDebug() << query.queryItemValue("callbackurl");
  // qDebug() << QUrl::toString(...);
  //  NSUrl *urls = url.toNSUrl();

   //NSUrl *urls = url.toString().toNSUrl();

NSUrl *urls = url.toNSUrl();
    bool canOpen = [[NSApplication shared] canOpenUrl: urls];
  qDebug() << canOpen;
    if(canOpen) {
        QDesktopServices::openUrl(url);
    }
  emit incomingURL(query.queryItemValue("callbackurl"));
  // emit incomingURL(url.toString());
}

What's this problem?unknown type name nsurl

Error: unknown type name NsURL

SGaist

It's NSURL

JonB

@Max-Base
Start by reading https://doc.qt.io/qt-5/qurl.html#toNSURL, where you will see it's spelt NSURL.

Max Base

Hello,

Thank you for your help and message.
Sorry for my question @SGaist @JonB

main.cpp file:

#include <QApplication>
#include <QQmlApplicationEngine>
#include <QtWebView>
#include <QDesktopServices>
#include <QUrl>
#include <QQmlContext>
#include "HandleURL.hpp"

int main(int argc, char *argv[])  {
  QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
  QApplication::setAttribute(Qt::AA_ShareOpenGLContexts);
  QApplication app(argc, argv);
  QtWebView::initialize();
  QQmlApplicationEngine engine;
  const QUrl url(QStringLiteral("qrc:/main.qml"));
  QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
         &app, [url](QObject *obj, const QUrl &objUrl) {
    if (!obj && url == objUrl)
      QCoreApplication::exit(-1);
  }, Qt::QueuedConnection);

  HandleURL *URLHandler = new HandleURL();
  QDesktopServices::setUrlHandler("swish", URLHandler, "handleURL");

  engine.load(url);
  engine.rootContext()->setContextProperty("URLHandler", URLHandler);
  return app.exec();
}

HandleURL.mm file:

#include <QDebug>
#include <QUrlQuery>
#include <QUrl>
#include <QDesktopServices>
#include "HandleURL.hpp"

#import <AppKit/NSApplication.h>
#import <Foundation/Foundation.h>

void HandleURL::handleURL(const QUrl &url) {
    QUrlQuery query(url);
    QUrl path(query.queryItemValue("callbackurl"));
    NSURL *urls = path.toNSURL();
    bool canOpen = [[NSApplication shared] canOpenUrl: urls];
    qDebug() << canOpen;
    if(canOpen) {
        QDesktopServices::openUrl(url);
    }
    emit incomingURL(query.queryItemValue("callbackurl"));
    // emit incomingURL(url.toString());
}

.pro file:

QT += widgets quick webview
CONFIG += c++17
TEMPLATE = app
DEFINES += QT_DEPRECATED_WARNINGS
LIBS += -framework AppKit -framework Foundation

SOURCES += \
        HandleURL.mm \
        main.cpp \
RESOURCES += qml.qrc
QML_IMPORT_PATH =
QML_DESIGNER_IMPORT_PATH =
# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target
contains(ANDROID_TARGET_ARCH,arm64-v8a) {
    ANDROID_ARM64 = 1
    ANDROID_EXTRA_LIBS = \
        $$PWD/openssl-1.1.1a-clang/arm64-v8a/lib/libcrypto.so \
        $$PWD/openssl-1.1.1a-clang/arm64-v8a/lib/libssl.so

            ANDROID_PACKAGE_SOURCE_DIR = \
                $$PWD/android
}

contains(ANDROID_TARGET_ARCH,armeabi-v7a) {
    ANDROID_EXTRA_LIBS = \
        $$PWD/openssl-1.1.1a-clang/armeabi-v7a/lib/libcrypto.so \
        $$PWD/openssl-1.1.1a-clang/armeabi-v7a/lib/libssl.so

    ANDROID_PACKAGE_SOURCE_DIR = \
        $$PWD/android
}




DISTFILES += \
    android/AndroidManifest.xml \
    android/build.gradle \
    android/gradle/wrapper/gradle-wrapper.jar \
    android/gradle/wrapper/gradle-wrapper.properties \
    android/gradlew \
    android/gradlew.bat \
    android/res/values/libs.xml

defineReplace(droidVersionCode) {
    segments = $$split(1, ".")
    for(segment, segments): vCode = "$$first(vCode)$$format_number($$segment, width=3 zeropad)"
    ## arm64-v8a, armeabi-v7a
    contains(ANDROID_TARGET_ARCH, arm64-v8a): \
        suffix = 1
    else:contains(ANDROID_TARGET_ARCH, armeabi-v7a): \
        suffix = 0
    return($$first(vCode)$$first(suffix))
}
ios {
   QMAKE_INFO_PLIST = ios/info.plist
}
VERSION = 1.2.3
ANDROID_VERSION_NAME = $$VERSION
ANDROID_VERSION_CODE = $$droidVersionCode($$ANDROID_VERSION_NAME)
HEADERS += \
    HandleURL.hpp

OBJECTIVE_SOURCES = HandleURL.mm

HandleURL.hpp file:

#ifndef HANDLEURL
#define HANDLEURL

  #include <QObject>
  #include <QDesktopServices>

  class HandleURL : public QObject {
    Q_OBJECT
    signals:
      void incomingURL(QString path);
    
    public slots:
      void handleURL(const QUrl &url);
  };

#endif

Compile Error

/Users/user/Desktop/silvcopy2/HandleURL.mm:7: error: 'AppKit/NSApplication.h' file not found
#import <AppKit/NSApplication.h>
        ^~~~~~~~~~~~~~~~~~~~~~~~

:-1: error: Xcodebuild failed.

SGaist

Did you re-run qmake after modifying your .pro file ?

If not then either nuke the build folder and restart a build or force a run of qmake.

On a side note, your .pro file has two issues: you have HandleURL.mm in both SOURCES and OBJECTIVE_SOURCES. If you are using a recent version of Qt, you don't need the later.

The other issue is the backslash after main.cpp.

Max Base

@SGaist Thank you for your message.

But we have error yet!

.mm file:

#include <QDebug>
#include <QUrlQuery>
#include <QUrl>
#include <QDesktopServices>
#include "HandleURL.hpp"
#import <Foundation/NSUserNotification.h>
#import <AppKit/NSApplication.h>


void HandleURL::handleURL(const QUrl &url) {
  // parse it...
  QUrlQuery query(url);
  // qDebug() << url.toString();
  // qDebug() << query.queryItemValue("callbackurl");
  // qDebug() << QUrl::toString(...);
  //  NSUrl *urls = url.toNSUrl();

   //NSUrl *urls = url.toString().toNSUrl();

NSUrl *urls = url.toNSUrl();
    bool canOpen = [[NSApplication shared] canOpenUrl: urls];
  qDebug() << canOpen;
    if(canOpen) {
        QDesktopServices::openUrl(url);
    }
  emit incomingURL(query.queryItemValue("callbackurl"));
  // emit incomingURL(url.toString());
}

.pro file:

#include Foundation/NSUserNotification.h>
#include AppKit/NSApplication.h>

QT += widgets quick webview
CONFIG += c++17
TEMPLATE = app
DEFINES += QT_DEPRECATED_WARNINGS
LIBS += -framework AppKit -framework Foundation

SOURCES += \
        main.cpp

RESOURCES += qml.qrc
QML_IMPORT_PATH =
QML_DESIGNER_IMPORT_PATH =
# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target
contains(ANDROID_TARGET_ARCH,arm64-v8a) {
    ANDROID_ARM64 = 1
    ANDROID_EXTRA_LIBS = \
        $$PWD/openssl-1.1.1a-clang/arm64-v8a/lib/libcrypto.so \
        $$PWD/openssl-1.1.1a-clang/arm64-v8a/lib/libssl.so

            ANDROID_PACKAGE_SOURCE_DIR = \
                $$PWD/android
}

contains(ANDROID_TARGET_ARCH,armeabi-v7a) {
    ANDROID_EXTRA_LIBS = \
        $$PWD/openssl-1.1.1a-clang/armeabi-v7a/lib/libcrypto.so \
        $$PWD/openssl-1.1.1a-clang/armeabi-v7a/lib/libssl.so

    ANDROID_PACKAGE_SOURCE_DIR = \
        $$PWD/android
}


DISTFILES += \
    android/AndroidManifest.xml \
    android/build.gradle \
    android/gradle/wrapper/gradle-wrapper.jar \
    android/gradle/wrapper/gradle-wrapper.properties \
    android/gradlew \
    android/gradlew.bat \
    android/res/values/libs.xml

defineReplace(droidVersionCode) {
    segments = $$split(1, ".")
    for(segment, segments): vCode = "$$first(vCode)$$format_number($$segment, width=3 zeropad)"
    ## arm64-v8a, armeabi-v7a
    contains(ANDROID_TARGET_ARCH, arm64-v8a): \
        suffix = 1
    else:contains(ANDROID_TARGET_ARCH, armeabi-v7a): \
        suffix = 0
    return($$first(vCode)$$first(suffix))
}
ios {
   QMAKE_INFO_PLIST = ios/info.plist
}
VERSION = 1.2.3
ANDROID_VERSION_NAME = $$VERSION
ANDROID_VERSION_CODE = $$droidVersionCode($$ANDROID_VERSION_NAME)
HEADERS += \
    HandleURL.hpp

OBJECTIVE_SOURCES = HandleURL.mm

ios -> info.plist file:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
  <key>CFBundleDisplayName</key>
  <string>${PRODUCT_NAME}</string>
  <key>CFBundleExecutable</key>
  <string>${EXECUTABLE_NAME}</string>
  <key>CFBundleGetInfoString</key>
  <string>Created by Qt/QMake</string>
  <key>CFBundleIdentifier</key>
  <string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
  <key>CFBundleName</key>
  <string>${PRODUCT_NAME}</string>
  <key>CFBundlePackageType</key>
  <string>APPL</string>
  <key>CFBundleShortVersionString</key>
  <string>${QMAKE_SHORT_VERSION}</string>
  <key>CFBundleSignature</key>
  <string>${QMAKE_PKGINFO_TYPEINFO}</string>
  <key>CFBundleVersion</key>
  <string>${QMAKE_FULL_VERSION}</string>
  <key>LSRequiresIPhoneOS</key>
  <true/>
  <key>MinimumOSVersion</key>
  <string>${IPHONEOS_DEPLOYMENT_TARGET}</string>
  <key>NOTE</key>
  <string>This file was generated by Qt/QMake.</string>
  <key>UILaunchStoryboardName</key>
  <string>LaunchScreen</string>
  <key>UISupportedInterfaceOrientations</key>
  <array>
    <string>UIInterfaceOrientationPortrait</string>
    <string>UIInterfaceOrientationPortraitUpsideDown</string>
    <string>UIInterfaceOrientationLandscapeLeft</string>
    <string>UIInterfaceOrientationLandscapeRight</string>
  </array>






<key>CFBundleURLTypes</key>
<array>
    <dict>
        <key>CFBundleURLSchemes</key>
        <array>
            <string>swish</string>
        </array>
    </dict>
</array>




</dict>
</plist>

Errors

/Users/user/Desktop/silvcopy22/HandleURL.mm:6: error: 'Foundation/NSUserNotification.h' file not found
#include <Foundation/NSUserNotification.h>
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

/Users/user/Desktop/silvcopy22/HandleURL.mm:6: did not find header 'NSUserNotification.h' in framework 'Foundation' (loaded from '/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator13.2.sdk/System/Library/Frameworks')

:-1: error: Xcodebuild failed.

Qt version: 5.13.2

Can you help and guide me?
Thank you

SGaist

Are you building for macOS or iOS ?

I built successfully for macOS but you seem to target the simulator.

Max Base

We want this for iOS (iphone). @SGaist

SGaist

From the documentation, NSUserNotification is a macOS API that is not deprecated.

Max Base

This post is deleted!

Max Base

How we can access to UIApplication? and how can call canopenurl?

Target is iOS using Qt.

https://developer.apple.com/documentation/uikit/uiapplication/1622952-canopenurl

SGaist

It's written on the page you are linking as well as the URL: use the UIKit framework.

Max Base

@SGaist said in UIApplication.shared.canOpenURL implements in Qt:

UIKit

I don't know how to use UIKit, UIApplication in my Qt project.
I cannot find any solution and sample code for this.
Can you help me?

SGaist

The exact same as you did with NSApplication, just use UIApplication in place.

Max Base

@SGaist said in UIApplication.shared.canOpenURL implements in Qt:

NSURL *url = myUrl.toNSUrl();
bool canOpen = [[UIApplication shared] canOpenUrl: url];

Thank you so much for your message.

Also how we can access to shared object when we are in another file?

It's a globally object in OBJECT C (.mm) files?

SGaist

The same way you did there. The function returns the singleton app instance.