[Qt-creator] How to include libraries in Qt

[Krishna Achugatla]

Hi Mark, Thanks. Still no luck, here I am explaining in detail.

Hi,

My objective is to create a shared library and link it with app and call
some APIs of dll in the app.

Platform Details:
-----------------------
Qt for Symbian 4.6.0
Qt Creator 1.3.0
S60 5th edition
Abld is build system

Below are the steps followed and issued faced.

1. Creating "App"
   I created an app called "MyApp" using Qt-Creator "Qt4 Gui Application"
option. Default tool chain used to build is GCCE and able to build it.

2. Creating "Shared Library"
   I created a shared library called "MyDLL" using Qt-Creator option "C++
Library" then "Shared Library". Default tool chain is GCCE and able to built
it.

3. Link "Shared Library" with "App"
   I don't find any good documentation of how to do this, the whole sequence
of steps needed. I figured that LIBS needs.

   Added below line to MyApp.pro file
   LIBS    += -lMyDLL.dll

   as suggested by qmake help, then building the app gives error

make[2]: *** No rule to make target
`\S60\devices\S60_5th_Edition_SDK_v1.0\epoc32\release\armv5\LIB\MyDLL.dso',
needed by
`\S60\devices\S60_5th_Edition_SDK_v1.0\epoc32\release\gcce\udeb\MyApp.exe'.
Stop.
make[1]: *** [TARGETMYAPP_0XE25A8EF2] Error 2

Question is : I am working with tool chain GCCE, why make is looking into
ARMV5 path?. i.e.
`\S60\devices\S60_5th_Edition_SDK_v1.0\epoc32\release\armv5\LIB\MyDLL.dso

4. Trying to work with Tool chain ARMV5
   First, I want to build the MyDLL with Armv5. I created a new project
settings with tool chain as ARMV5, then build MyDLL. Following error occrued

   Error: C0000U: Unrecognized option '--visibility_inlines_hidden'.
make[2]: ***
[\S60\devices\S60_5th_Edition_SDK_v1.0\EPOC32\BUILD\Qt-Projects\DLL\MyDLL\MYDLL_0XE11197E8\ARMV5\udeb\mydll.o]
Error 1
make[1]: *** [TARGETMYDLL_0XE11197E8] Error 2

  The generated MyDLL_0xE11197e8.mmp file has the line
  OPTION ARMCC --visibility_inlines_hidden --fpu softvfp


I feel, creating a library is a very basic thing and it should be very easy
for any body to do. There should be a single wiki page explaining all the
steps with code whereever possible.

I feel we should have detailed docmentation for Static Library, Shared
Library and Plugins with code examples.

Let me know if I miss any thing...

-Krishna.


On 11 February 2010 22:40, Ladnar, Marc <Marc.Ladnar at ksab.kroschu.com>wrote:

>  Hi Krishna,
>
> ther is no difference in binding your static or dynamic library into
> another app.
> You just have to put this line into your app.pro file:
> LIBS += -L[PATH_TO_YOUR_LIB] -l[LIB_NAME]
> If your lib is called libxy, you will have to add -lxy, so leave the part
> "lib".
> Static libs are directly included into the binary, dynamic libs have to be
> delivered with the app.
>
> Adding Plugins into your app needs the QPluginLoader, it is documented in
> QtAssistant. Plugins have to be delivered with the app, too.
>
> Hope I could help, have a nice day.
>
> Marc Ladnar
>
>  ------------------------------
>    *Von:* Krishna Achugatla [mailto:krishnaa at symbian.org]
> *Gesendet:* Freitag, 12. Februar 2010 00:24
> *An:* Qt-creator at trolltech.com
> *Betreff:* [Qt-creator] How to include libraries in Qt
>
>   Hi,
>
>  I have created a Qt SharedLibrary (e.g. MySharedLibrary) using
> Qt-Creator. I followed the navigation steps "File"->"New File or
> Project->Projects"->"C++ Library". Then choose the "Type" as "Shared
> Library", gave name and it created the Shared Library. The created shared
> lib has the necessary declarations and defines wrt Q_DECL_EXPORT. I wrote
> few functions in that class, so that they can be accessed in another
> application.
>
>  How do I include this Shared Library as part of another Qt Application?.
> What are the necessary changes required to make to .pro file (like adding
> LIBS variable) and source files of the app?. Please let me know any
> documentation is available. If the documentation explains with code, the
> necessary changes then it becomes very easy for developers.
>
>  Similarly it is good to have documentation about other two types of
> libraries, viz. "Statically linked library" & "Plugin", how to include them
> in an application with example code.
>
>  -Krishna.
>
>
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>
>
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