Qt Android client for Postresql

akn10red

hello. a newbie here so pardon me foor noob question but can you please tell me if i can use these pre-built libraries to my project or i'll have to build myself? next problem is that i don't know how to add these .so libraries to my project. I tried to add this line in .pro file but that didn't work. the apk doesn't include this lib in the "lib" folder when seen using winRaR
@LIBS += -L "e:\sqlib" -libpq.so@

akn10red

hello. a newbie here so pardon me foor noob question but can you please tell me if i can use these pre-built libraries to my project or i'll have to build myself? next problem is that i don't know how to add these .so libraries to my project. I tried to add this line in .pro file but that didn't work. the apk doesn't include this lib in the "lib" folder when seen using winRaR
@LIBS += -L "e:\sqlib" -libpq.so@

antreimer

"LIBS +=" is to link to libraries. If you want to include ".so" files in your apk you need to use the following line

@ANDROID_EXTRA_LIBS=/path/to/libpq.so@

antreimer

"LIBS +=" is to link to libraries. If you want to include ".so" files in your apk you need to use the following line

@ANDROID_EXTRA_LIBS=/path/to/libpq.so@

akn10red

thanks. now that the .so files are included, the application exits with the error "your application encountered a fatal error and cannot continue" upon launching :( not sure what to do with it and as i said i'm a noob to to figure it out :P

akn10red

thanks. now that the .so files are included, the application exits with the error "your application encountered a fatal error and cannot continue" upon launching :( not sure what to do with it and as i said i'm a noob to to figure it out :P

akn10red

this is the application output:

@I/Qt ( 7822): qt start
D/dalvikvm( 7822): Trying to load lib /data/data/org.qtproject.example.btchat/lib/libpq.so 0x411e6f98
W/System.err( 7822): java.lang.reflect.InvocationTargetException
W/System.err( 7822): at java.lang.reflect.Method.invokeNative(Native Method)
W/System.err( 7822): at java.lang.reflect.Method.invoke(Method.java:511)
W/System.err( 7822): at org.qtproject.qt5.android.bindings.QtActivity.loadApplication(QtActivity.java:245)
W/System.err( 7822): at org.qtproject.qt5.android.bindings.QtActivity.startApp(QtActivity.java:655)
W/System.err( 7822): at org.qtproject.qt5.android.bindings.QtActivity.onCreate(QtActivity.java:895)
W/System.err( 7822): at android.app.Activity.performCreate(Activity.java:5008)
W/System.err( 7822): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
W/System.err( 7822): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
W/System.err( 7822): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
W/System.err( 7822): at android.app.ActivityThread.access$600(ActivityThread.java:130)
W/System.err( 7822): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
W/System.err( 7822): at android.os.Handler.dispatchMessage(Handler.java:99)
W/System.err( 7822): at android.os.Looper.loop(Looper.java:137)
W/System.err( 7822): at android.app.ActivityThread.main(ActivityThread.java:4745)
W/System.err( 7822): at java.lang.reflect.Method.invokeNative(Native Method)
W/System.err( 7822): at java.lang.reflect.Method.invoke(Method.java:511)
W/System.err( 7822): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
W/System.err( 7822): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
W/System.err( 7822): at dalvik.system.NativeStart.main(Native Method)
W/System.err( 7822): Caused by: java.lang.UnsatisfiedLinkError: Cannot load library: reloc_library[1306]: 36 cannot locate 'sigemptyset'...
W/System.err( 7822): at java.lang.Runtime.load(Runtime.java:340)
W/System.err( 7822): at java.lang.System.load(System.java:521)
W/System.err( 7822): at org.qtproject.qt5.android.QtNative.loadBundledLibraries(QtNative.java:156)
W/System.err( 7822): at org.qtproject.qt5.android.QtActivityDelegate.loadApplication(QtActivityDelegate.java:430)
W/System.err( 7822): ... 19 more@

akn10red

this is the application output:

@I/Qt ( 7822): qt start
D/dalvikvm( 7822): Trying to load lib /data/data/org.qtproject.example.btchat/lib/libpq.so 0x411e6f98
W/System.err( 7822): java.lang.reflect.InvocationTargetException
W/System.err( 7822): at java.lang.reflect.Method.invokeNative(Native Method)
W/System.err( 7822): at java.lang.reflect.Method.invoke(Method.java:511)
W/System.err( 7822): at org.qtproject.qt5.android.bindings.QtActivity.loadApplication(QtActivity.java:245)
W/System.err( 7822): at org.qtproject.qt5.android.bindings.QtActivity.startApp(QtActivity.java:655)
W/System.err( 7822): at org.qtproject.qt5.android.bindings.QtActivity.onCreate(QtActivity.java:895)
W/System.err( 7822): at android.app.Activity.performCreate(Activity.java:5008)
W/System.err( 7822): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
W/System.err( 7822): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
W/System.err( 7822): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
W/System.err( 7822): at android.app.ActivityThread.access$600(ActivityThread.java:130)
W/System.err( 7822): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
W/System.err( 7822): at android.os.Handler.dispatchMessage(Handler.java:99)
W/System.err( 7822): at android.os.Looper.loop(Looper.java:137)
W/System.err( 7822): at android.app.ActivityThread.main(ActivityThread.java:4745)
W/System.err( 7822): at java.lang.reflect.Method.invokeNative(Native Method)
W/System.err( 7822): at java.lang.reflect.Method.invoke(Method.java:511)
W/System.err( 7822): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
W/System.err( 7822): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
W/System.err( 7822): at dalvik.system.NativeStart.main(Native Method)
W/System.err( 7822): Caused by: java.lang.UnsatisfiedLinkError: Cannot load library: reloc_library[1306]: 36 cannot locate 'sigemptyset'...
W/System.err( 7822): at java.lang.Runtime.load(Runtime.java:340)
W/System.err( 7822): at java.lang.System.load(System.java:521)
W/System.err( 7822): at org.qtproject.qt5.android.QtNative.loadBundledLibraries(QtNative.java:156)
W/System.err( 7822): at org.qtproject.qt5.android.QtActivityDelegate.loadApplication(QtActivityDelegate.java:430)
W/System.err( 7822): ... 19 more@

antreimer

The problem is this that it cannot locate 'sigemptyset'...

isgemptyset should be in libc.so but is missing in the older android builds.

The workaround that works for me was to staticlally link libc. I uploaded the changes and the lib is now 10x larger at 2MB. I'll update the wiki and include instructions to statically link.

antreimer

The problem is this that it cannot locate 'sigemptyset'...

isgemptyset should be in libc.so but is missing in the older android builds.

The workaround that works for me was to staticlally link libc. I uploaded the changes and the lib is now 10x larger at 2MB. I'll update the wiki and include instructions to statically link.

akn10red

with the new lib file the app crashes without showing any message. and application output is:
@{ . . .
I/Qt (27083): qt start
D/dalvikvm(27083): Trying to load lib /data/data/org.qtproject.example.btchat/lib/libpq.so 0x411e4508
F/libc (27083): Fatal signal 11 (SIGSEGV) at 0x00006c23 (code=1), thread 27083 (.example.btchat)
}@

EDIT: The app seems to be working on my phone. However I don't know whether it should work the same way as described in Qt documentation or not. The code given under doesn't seem to be making database connection (hence else part is executed) :
@
QSqlDatabase db= QSqlDatabase::addDatabase("QPSQL");

    db.setHostName("89.129.198.19");
    db.setDatabaseName("abcde");
    db.setUserName("activa");
    db.setPassword("X123xyz");
    db.setPort(5432);

    bool ok = db.open();

    if(!ok)
        {
            QMessageBox::information(this,"Connection","Connection Failed!");
        }
    else
        {
             QMessageBox::information(this,"Connection","Connection Established!");
        }@

akn10red

with the new lib file the app crashes without showing any message. and application output is:
@{ . . .
I/Qt (27083): qt start
D/dalvikvm(27083): Trying to load lib /data/data/org.qtproject.example.btchat/lib/libpq.so 0x411e4508
F/libc (27083): Fatal signal 11 (SIGSEGV) at 0x00006c23 (code=1), thread 27083 (.example.btchat)
}@

EDIT: The app seems to be working on my phone. However I don't know whether it should work the same way as described in Qt documentation or not. The code given under doesn't seem to be making database connection (hence else part is executed) :
@
QSqlDatabase db= QSqlDatabase::addDatabase("QPSQL");

    db.setHostName("89.129.198.19");
    db.setDatabaseName("abcde");
    db.setUserName("activa");
    db.setPassword("X123xyz");
    db.setPort(5432);

    bool ok = db.open();

    if(!ok)
        {
            QMessageBox::information(this,"Connection","Connection Failed!");
        }
    else
        {
             QMessageBox::information(this,"Connection","Connection Established!");
        }@

antreimer

The first so file I uploaded was only tested against lollipop. The second one was also tested against KitKat. I'll look into it. My brother has a Jellybean phone.

Edit:

I uploaded libpq.so now compiled with android-9.

antreimer

The first so file I uploaded was only tested against lollipop. The second one was also tested against KitKat. I'll look into it. My brother has a Jellybean phone.

Edit:

I uploaded libpq.so now compiled with android-9.

akn10red

[quote author="antreimer" date="1424547268"]The first so file I uploaded was only tested against lollipop. The second one was also tested against KitKat. I'll look into it. My brother has a Jellybean phone.[/quote]

i've edited my post. please the app seems to be working on my phone but now the database connection is not being established :P

BTW i'm testing it on KitKat too

akn10red

[quote author="antreimer" date="1424547268"]The first so file I uploaded was only tested against lollipop. The second one was also tested against KitKat. I'll look into it. My brother has a Jellybean phone.[/quote]

i've edited my post. please the app seems to be working on my phone but now the database connection is not being established :P

BTW i'm testing it on KitKat too

antreimer

Could you add something like
@QMessageBox::information(this,"Connection", db.lastError().text() );@
I think that'll output the error in connection

antreimer

Could you add something like
@QMessageBox::information(this,"Connection", db.lastError().text() );@
I think that'll output the error in connection

akn10red

I already did that. it says driver not loaded. its is the same error i was getting without this library. I added this code to check whether the library was loaded or not. And it shows that it is loaded (message box is shown):

@ QLibrary library("libpq.so");

if (library.load())
QMessageBox::information(this,"Loaded","Lib loaded");@

akn10red

I already did that. it says driver not loaded. its is the same error i was getting without this library. I added this code to check whether the library was loaded or not. And it shows that it is loaded (message box is shown):

@ QLibrary library("libpq.so");

if (library.load())
QMessageBox::information(this,"Loaded","Lib loaded");@