Android App Development include LDAP on MAC OS X

mkmp29 · wrote on 28 Mar 2018, 12:00

I want to add the ldap framework, which is located in xcode under /System/Library/Frameworks/LDAP.framework, to my qt application. The app should generate a android application.

I tried it first on a normal console application generated with qt. It works with the following .pro file:

QT -= gui

CONFIG += c++11 console
CONFIG -= app_bundle

# The following define makes your compiler emit warnings if you use
# any feature of Qt which as been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += main.cpp \
    ldapAuth.cpp \
    user.cpp

HEADERS += \
    ldapAuth.h \
    user.h

mac: LIBS += -framework LDAP

After that I wanted to port it to the android application, but the compiler don't find the included ldap.h in my file.

# ekke (Ekkehard Gentz) @ekkescorner
TEMPLATE = app
TARGET = stacked_pages_x

QT += qml quick core sql
CONFIG += c++11
CONFIG -= app_bundle

mac: LIBS += -F/System/Library/Frameworks/LDAP.framework
mac: LIBS += -framework LDAP

HEADERS += \
    applicationui.hpp \
    uiconstants.hpp \
    handlenewstudent.h \
    entities/admin.h \
    dbhelper.h \
    entities/student.h \
    ldapAuth.h

SOURCES += main.cpp \
    applicationui.cpp \
    handlenewstudent.cpp \
    entities/admin.cpp \
    dbhelper.cpp \
    entities/student.cpp \
    ldapAuth.cpp

lupdate_only {
    SOURCES +=  main.qml \
    common/*.qml \
    pages/*.qml
}

OTHER_FILES += images/black/*.png \
    images/black/x18/*.png \
    images/black/x36/*.png \
    images/black/x48/*.png \
    images/white/*.png \
    images/white/x18/*.png \
    images/white/x36/*.png \
    images/white/x48/*.png \
    translations/*.* \
    images/LICENSE \
    LICENSE \
    *.md

RESOURCES += \
    translations.qrc \
    qml.qrc \
    images.qrc

# Additional import path used to resolve QML modules in Qt Creator's code model
QML_IMPORT_PATH =

# Default rules for deployment.
include(deployment.pri)

# T R A N S L A T I O N S

# if languages are added:
# 1. rebuild project to generate *.qm
# 2. add existing .qm files to translations.qrc

# if changes to translatable strings:
# 1. Run Tools-External-Linguist-Update
# 2. Run Linguist and do translations
# 3. Build and run on iOS and Android to verify translations
# 4. Optional: if translations not done: Run Tools-External-Linguist-Release

# Supported languages
LANGUAGES = de en

# used to create .ts files
 defineReplace(prependAll) {
     for(a,$$1):result += $$2$${a}$$3
     return($$result)
 }
# Available translations
tsroot = $$join(TARGET,,,.ts)
tstarget = $$join(TARGET,,,_)
TRANSLATIONS = $$PWD/translations/$$tsroot
TRANSLATIONS += $$prependAll(LANGUAGES, $$PWD/translations/$$tstarget, .ts)
# run LRELEASE to generate the qm files
qtPrepareTool(LRELEASE, lrelease)
 for(tsfile, TRANSLATIONS) {
     command = $$LRELEASE $$tsfile
     system($$command)|error("Failed to run: $$command")
 }

DISTFILES += \
    pages/PageStudentNew.qml \
    pages/PageItemOverview.qml \
    pages/PageItemNew.qml \
    pages/PageHome.qml \
    pages/PageUserOverview.qml \
    pages/PageUserNew.qml \
    pages/PageBorrowedItemsOverview.qml \
    pages/PageBorrowItem.qml \
    pages/PageGiveBackItem.qml \
    pages/PageLogin.qm

QT can't find the library, which is located in the ldap.h data.

What can I do to get it done ?

sierdzio · wrote on 28 Mar 2018, 12:07

@mkmp29 said in Android App Development include LDAP on MAC OS X:

mac: LIBS += -F/System/Library/Frameworks/LDAP.framework
mac: LIBS += -framework LDAP

You are only including the framework on Mac.

In order to include a lib for Android, you need to:

cross-compile that library using Android NDK
import it in your .pro file
if the library is a shared lib, you also need to add it to ANDROID_EXTRA_LIBS

mkmp29 · 4 Feb 2018, 18:20

I compiled the framework with this script:

#!/bin/bash

#adjust
export NDK_LOCATION="/Users/user123/Library/Android/sdk"

export ANDROID_NDK_HOME="$NDK_LOCATION/ndk-bundle"
export CC="arm-linux-androideabi-gcc"
export CXX="arm-linux-androideabi-g++"
export RANLIB="arm-linux-androideabi-ranlib"
export LD="arm-linux-androideabi-ld"
export AR="arm-linux-androideabi-ar"
export CROSS_COMPILE="arm-linux-androideabi"
#define android api
export ANDROID_API=16
export CFLAGS="-D__ANDROID_API__=$ANDROID_API"

#install toolchain
${ANDROID_NDK_HOME}/build/tools/make-standalone-toolchain.sh --platform=android-${ANDROID_API} --install-dir=${ANDROID_NDK_HOME}/android-toolchain

export PATH="$PATH:$ANDROID_NDK_HOME/android-toolchain/bin"
export LIB_DIR="`pwd`/lib"
export LDAP_OUTPUT_DIR="${LIB_DIR}/compiled/OpenLDAP"

#download lib
#git clone https://github.com/openldap/openldap.git
cd "$LIB_DIR/openldap"

./configure --host=${CROSS_COMPILE} --prefix="${LDAP_OUTPUT_DIR}" --with-yielding_select=yes

make depend
make && make install

And tried to add it in my pro file:

# ekke (Ekkehard Gentz) @ekkescorner
TEMPLATE = app
TARGET = stacked_pages_x

QT += qml quick core sql
CONFIG += c++11

INCLUDEPATH += lib/compiled/OpenLDAP/include
LIBS += -L lib/compiled/OpenLDAP/lib -lldap
ANDROID_EXTRA_LIBS += lib/compiled/OpenLDAP/lib/libldap.so

HEADERS += \
    handlenewstudent.h \
    applicationui.hpp \
    uiconstants.hpp \
    entities/admin.h \
    dbhelper.h \
    entities/student.h \
    handletextfield.h \
    lists/studentlist.h \
    entities/studentlistmodel.h\
    ldapAuth.h

SOURCES += main.cpp \
    applicationui.cpp \
    entities/admin.cpp \
    dbhelper.cpp \
    entities/student.cpp \
    handletextfield.cpp \
    lists/studentlist.cpp \
    entities/studentlistmodel.cpp\
    ldapAuth.cpp \
    handlenewstudent.cpp

lupdate_only {
    SOURCES +=  main.qml \
    common/*.qml \
    pages/*.qml
}

OTHER_FILES += images/black/*.png \
    images/black/x18/*.png \
    images/black/x36/*.png \
    images/black/x48/*.png \
    images/white/*.png \
    images/white/x18/*.png \
    images/white/x36/*.png \
    images/white/x48/*.png \
    translations/*.* \
    images/LICENSE \
    LICENSE \
    *.md

RESOURCES += \
    translations.qrc \
    qml.qrc \
    images.qrc

# Additional import path used to resolve QML modules in Qt Creator's code model
QML_IMPORT_PATH =

# Default rules for deployment.
include(deployment.pri)

# T R A N S L A T I O N S

# if languages are added:
# 1. rebuild project to generate *.qm
# 2. add existing .qm files to translations.qrc

# if changes to translatable strings:
# 1. Run Tools-External-Linguist-Update
# 2. Run Linguist and do translations
# 3. Build and run on iOS and Android to verify translations
# 4. Optional: if translations not done: Run Tools-External-Linguist-Release

# Supported languages
LANGUAGES = de en

# used to create .ts files
 defineReplace(prependAll) {
     for(a,$$1):result += $$2$${a}$$3
     return($$result)
 }
# Available translations
tsroot = $$join(TARGET,,,.ts)
tstarget = $$join(TARGET,,,_)
TRANSLATIONS = $$PWD/translations/$$tsroot
TRANSLATIONS += $$prependAll(LANGUAGES, $$PWD/translations/$$tstarget, .ts)
# run LRELEASE to generate the qm files
qtPrepareTool(LRELEASE, lrelease)
 for(tsfile, TRANSLATIONS) {
     command = $$LRELEASE $$tsfile
     system($$command)|error("Failed to run: $$command")
 }

DISTFILES += \
    pages/PageStudentNew.qml \
    pages/PageItemOverview.qml \
    pages/PageItemNew.qml \
    pages/PageHome.qml \
    pages/PageUserOverview.qml \
    pages/PageUserNew.qml \
    pages/PageBorrowedItemsOverview.qml \
    pages/PageBorrowItem.qml \
    pages/PageGiveBackItem.qml \
    pages/PageLogin.qml

But it still don't work, it throws errors that functions are not in the declared scope

/Edit: solved it, I used deprecated functionality of the library that can be enabled over the macro LDAP_DEPRECATED

sierdzio · M mkmp29 29 Mar 2018, 14:09

@mkmp29 said in Android App Development include LDAP on MAC OS X:

But it still don't work, it throws errors that functions are not in the declared scope

What errors and where?

This line looks fishy to me: --host=${CROSS_COMPILE}

The host is your host machine (your Mac), so it should rather be something like x86_64, and not the ARM architecture. But maybe LDAP is using some other convention, I don't know.

mkmp29 · 4 Feb 2018, 18:18

This post is deleted!

mkmp29 · wrote on 2 Apr 2018, 18:49

My error is:

:-1: error: error: cannot find -lldap

I think there is mistake in the .pro file:

The Filestructure is:

- *.pro
- lib
  - compiled
    - OpenLDAP
       - lib
       - include 
       - *
- other files

in the lib directory are these files:

liblber-2-devel.so.0       libldap.la
liblber-2-devel.so.0.0.0   libldap.so
liblber.a                  libldap_r-2-devel.so.0
liblber.la                 libldap_r-2-devel.so.0.0.0
liblber.so                 libldap_r.a
libldap-2-devel.so.0       libldap_r.la
libldap-2-devel.so.0.0.0   libldap_r.so
libldap.a

sierdzio · wrote on 4 Apr 2018, 09:58

@mkmp29 said in Android App Development include LDAP on MAC OS X:

-L lib/compiled/OpenLDAP/lib -lldap

There should be no space between '-L' and your library search path.

mkmp29 · 4 Apr 2018, 13:09

@mkmp29 said in Android App Development include LDAP on MAC OS X:

INCLUDEPATH += lib/compiled/OpenLDAP/include
LIBS += -L lib/compiled/OpenLDAP/lib -lldap
ANDROID_EXTRA_LIBS += lib/compiled/OpenLDAP/lib/libldap.so

Didn't work either. I just get the message for multiple lib function:

ldapAuth.o:ldapAuth.cpp:function LDAPAuth::~LDAPAuth(): error: undefined reference to 'ldap_unbind'
ldapAuth.o:ldapAuth.cpp:function LDAPAuth::~LDAPAuth(): error: undefined reference to 'ldap_unbind'
ldapAuth.o:ldapAuth.cpp:function LDAPAuth::checkStatus(QString const&, int): error: undefined reference to 'ldap_err2string'
ldapAuth.o:ldapAuth.cpp:function LDAPAuth::checkStatus(QString const&, int): error: undefined reference to 'ldap_err2string'
ldapAuth.o:ldapAuth.cpp:function LDAPAuth::init(): error: undefined reference to 'ldap_initialize'
ldapAuth.o:ldapAuth.cpp:function LDAPAuth::init(): error: undefined reference to 'ldap_initialize'
ldapAuth.o:ldapAuth.cpp:function LDAPAuth::init(): error: undefined reference to 'ldap_set_option'
ldapAuth.o:ldapAuth.cpp:function LDAPAuth::init(): error: undefined reference to 'ldap_set_option'
ldapAuth.o:ldapAuth.cpp:function LDAPAuth::init(): error: undefined reference to 'ldap_start_tls_s'
ldapAuth.o:ldapAuth.cpp:function LDAPAuth::init(): error: undefined reference to 'ldap_start_tls_s'
ldapAuth.o:ldapAuth.cpp:function LDAPAuth::init(): error: undefined reference to 'ldap_simple_bind_s'
ldapAuth.o:ldapAuth.cpp:function LDAPAuth::search(QString const&): error: undefined reference to 'ldap_search_ext_s'
ldapAuth.o:ldapAuth.cpp:function LDAPAuth::search(QString const&): error: undefined reference to 'ldap_first_entry'
ldapAuth.o:ldapAuth.cpp:function LDAPAuth::search(QString const&): error: undefined reference to 'ldap_get_dn'
ldapAuth.o:ldapAuth.cpp:function LDAPAuth::search(QString const&): error: undefined reference to 'ldap_first_attribute'
ldapAuth.o:ldapAuth.cpp:function LDAPAuth::search(QString const&): error: undefined reference to 'ldap_get_values'
ldapAuth.o:ldapAuth.cpp:function LDAPAuth::search(QString const&): error: undefined reference to 'ldap_next_attribute'
ldapAuth.o:ldapAuth.cpp:function LDAPAuth::search(QString const&): error: undefined reference to 'ldap_memfree'
ldapAuth.o:ldapAuth.cpp:function LDAPAuth::search(QString const&): error: undefined reference to 'ldap_next_entry'
ldapAuth.o:ldapAuth.cpp:function LDAPAuth::search(QString const&): error: undefined reference to 'ldap_msgfree'
ldapAuth.o:ldapAuth.cpp:function LDAPAuth::search(QString const&): error: undefined reference to 'ldap_msgfree'
ldapAuth.o:ldapAuth.cpp:function LDAPAuth::authentificate(QString const&, QString const&): error: undefined reference to 'ldap_simple_bind_s'
collect2: error: ld returned 1 exit status

Looks like the library is compiled wrong ?

SGaist · 4 Oct 2018, 20:20

Hi,

Did you check the x86 vs x86_64 architecture for your library ?

mkmp29 · S SGaist 4 Apr 2018, 21:58

@SGaist
I can only compile the library for the arm architecture. Other architecture fail because they can't find libraries...

Is there a better solution than compile the library for every architecture of the enddevice?

SGaist · 14 Apr 2018, 10:01

No there's not.

The only alternative is to check whether your targets already have them available in their root filesystem and re-use them.

mkmp29 · S SGaist 10 Apr 2018, 20:21

This post is deleted!

mkmp29 · S SGaist 4 Apr 2018, 21:58

@SGaist

I can compile the application and push it to the virtual device. But i get the error:

W System.err: Caused by: java.lang.UnsatisfiedLinkError: dlopen failed: library "liblber-2-devel.so.0" not found

This file is contained in the lib folder of my cross compiled library. I read a little bit and tried to load the library during runtime with the QT Object: QLibrary and the function load. But it didnt work.

this is the part of my .pro file

ANDROID_EXTRA_LIBS += $$PWD/lib/compiled/openldap-i686-linux-android_16/lib/libldap.so
ANDROID_EXTRA_LIBS += $$PWD/lib/compiled/openldap-i686-linux-android_16/lib/liblber.so
ANDROID_EXTRA_LIBS += $$PWD/lib/compiled/openldap-i686-linux-android_16/lib/libldap_r.so
#ANDROID_EXTRA_LIBS += $$PWD/lib/compiled/openldap-i686-linux-android_16/lib/liblber-2-devel.so.0
#ANDROID_EXTRA_LIBS += $$PWD/lib/compiled/openldap-i686-linux-android_16/lib/liblber-2-devel.so.0.0.0
#ANDROID_EXTRA_LIBS += $$PWD/lib/compiled/openldap-i686-linux-android_16/lib/libldap-2-devel.so.0
#ANDROID_EXTRA_LIBS += $$PWD/lib/compiled/openldap-i686-linux-android_16/lib/libldap-2-devel.so.0.0.0
#ANDROID_EXTRA_LIBS += $$PWD/lib/compiled/openldap-i686-linux-android_16/lib/libldap_r-2-devel.so.0
#ANDROID_EXTRA_LIBS += $$PWD/lib/compiled/openldap-i686-linux-android_16/lib/libldap_r-2-devel.so.0.0.0

LIBS += -L$$PWD/lib/compiled/openldap-i686-linux-android_16/lib/ -lldap

INCLUDEPATH += $$PWD/lib/compiled/openldap-i686-linux-android_16/include
DEPENDPATH += $$PWD/lib/compiled/openldap-i686-linux-android_16/include

PRE_TARGETDEPS += $$PWD/lib/compiled/openldap-i686-linux-android_16/lib/libldap.a
LIBS += -L$$PWD/lib/compiled/openldap-i686-linux-android_16/lib/ -llber

INCLUDEPATH += $$PWD/lib/compiled/openldap-i686-linux-android_16/include
DEPENDPATH += $$PWD/lib/compiled/openldap-i686-linux-android_16/include

PRE_TARGETDEPS += $$PWD/lib/compiled/openldap-i686-linux-android_16/lib/liblber.a

LIBS += -L$$PWD/lib/compiled/openldap-i686-linux-android_16/lib/ -lldap_r

INCLUDEPATH += $$PWD/lib/compiled/openldap-i686-linux-android_16/include
DEPENDPATH += $$PWD/lib/compiled/openldap-i686-linux-android_16/include

PRE_TARGETDEPS += $$PWD/lib/compiled/openldap-i686-linux-android_16/lib/libldap_r.a

Library loading at the beginning of the main method.

    QLibrary ldap("ldap");
    QLibrary ldap_r("ldap_r");
    QLibrary lber("lber");

    if(!ldap.load() || !lber.load() || !ldap_r.load()){
        qDebug() << "Failed loading library";
    }

The libraries that are contained in the lib folder are listed above

SGaist · 15 Apr 2018, 13:37

IIRC, android doesn't support library versioning so ensure that you don't have a symbolic link copied to your package but a copy of the library.

mkmp29 · S SGaist 14 Apr 2018, 20:31

This post is deleted!

mkmp29 · S SGaist 14 Apr 2018, 20:31

@SGaist said in Android App Development include LDAP on MAC OS X:

IIRC, android doesn't support library versioning so ensure that you don't have a symbolic link copied to your package but a copy of the library.

I removed the links from the libraries, deleted the links and renamed the lib to its original name, but the error still appears...

SGaist · 17 Apr 2018, 15:39

Which one ? The missing symbol or the dlopen error ?

mkmp29 · S SGaist 15 Apr 2018, 20:11

@SGaist

the dlopen error.

I also tried to copy the versioned libs into the same folder in the android libs directory. But it didn't work.

SGaist · 19 Apr 2018, 07:29

Why are you dlopening the library on Android rather than linking to it ?

mkmp29 · 19 Apr 2018, 21:09

@SGaist

this does the the library... I only include the library into my project