[Insight-users] Problems building the example from "Introduction
to FLTK" by Luis Ibanez
Luis Ibanez
luis . ibanez at kitware . com
Thu, 06 Nov 2003 15:10:51 -0500
Hi Lino,
The compilation errors that you get show
that you are not including the header file
CalculatorGUI.h from CalculatorGUI.cxx.
That's why the compiler cannot find the
definition of the CalculatorGUI class and
complains with:
> Compiling...
> CalculatorGUI.cxx
> C:\Lino\PhD\2003\SummerWork\fltk\testCalculator\CalculatorGUI.cxx(3)
> : error
> C2653: 'CalculatorGUI' : is not a class or namespace name
When you created the FLUID file CalculatorGUI.fld
you clicked in the option :
"Include header from Code"
This is shown at the top of your fluid file
>>># data file for the Fltk User Interface Designer (fluid)
>>>
>>>version 1.0104
>>>
>>>do_not_include_H_from_C <<<==========={{{ HERE
>>>
>>>header_name {.h}
>>>
>>>code_name {.cxx}
So, the solution is:
*Don't do that !*
Open the .fld file again with FLUID,
Go to the "Edit" menu, then select
"Project setting" and make sure that
you enable the button
"Include header from Code"
Then, save the fluid file and regenerate
the .cxx and .h files.
Finally, reload the project in VisualStudio
and rebuild it.
Regards,
Luis
---------------------------
Lino Ramirez wrote:
> Hi Luis,
>
> Thank you for the help. I still don’t get it to work thought. Making the
> change you suggested I eliminated a couple of errors but I am still getting
> the following errors:
>
> --------------------Configuration: TestCalculator - Win32
> Debug--------------------
> Compiling...
> main.cxx
> Linking...
> main.obj : error LNK2001: unresolved external symbol "public: __thiscall
> CalculatorGUI::CalculatorGUI(void)" (??0CalculatorGUI@@QAE at XZ)
> main.obj : error LNK2001: unresolved external symbol "public: virtual
> __thiscall CalculatorGUI::~CalculatorGUI(void)" (??1CalculatorGUI@@UAE at XZ)
> Debug/TestCalculator.exe : fatal error LNK1120: 2 unresolved externals
> Error executing link.exe.
>
> ALL_BUILD - 3 error(s), 0 warning(s)
>
> Then, I noticed I forgot to include the file CalculatorGUI.cxx (one of the
> files created by fluid) in my project. So, I modified my CMakeLists.txt to
> look like
> ----------------------------------------------------------------------------
> ---------------------------
> PROJECT( TestCalculator )
>
> INCLUDE (${CMAKE_ROOT}/Modules/FindFLTK.cmake)
>
> INCLUDE_DIRECTORIES(
> ${FLTK_INCLUDE_PATH}
> )
>
> SET( TestCalculator_SRCS
> CalculatorGUI.cxx
> main.cxx
> )
>
> ADD_EXECUTABLE( TestCalculator TestCalculator_SRCS )
>
> TARGET_LINK_LIBRARIES( TestCalculator ${FLTK_LIBRARIES})
> ----------------------------------------------------------------------------
> ------------------------
>
> But, now I am getting 102 errors. Some of them are listed below.
>
> Could you tell what I have to do to get this simple program running?
>
> Thank you very much
>
> Lino Ramirez
>
> --------------------Configuration: TestCalculator - Win32
> Debug--------------------
> Compiling...
> CalculatorGUI.cxx
> C:\Lino\PhD\2003\SummerWork\fltk\testCalculator\CalculatorGUI.cxx(3) : error
> C2653: 'CalculatorGUI' : is not a class or namespace name
> C:\Lino\PhD\2003\SummerWork\fltk\testCalculator\CalculatorGUI.cxx(3) : error
> C2065: 'Fl_Value_Input' : undeclared identifier
> C:\Lino\PhD\2003\SummerWork\fltk\testCalculator\CalculatorGUI.cxx(3) : error
> C2065: 'o' : undeclared identifier
> C:\Lino\PhD\2003\SummerWork\fltk\testCalculator\CalculatorGUI.cxx(3) : error
> C2062: type 'void' unexpected
> C:\Lino\PhD\2003\SummerWork\fltk\testCalculator\CalculatorGUI.cxx(3) : error
> C2143: syntax error : missing ';' before '{'
> C:\Lino\PhD\2003\SummerWork\fltk\testCalculator\CalculatorGUI.cxx(3) : error
> C2447: missing function header (old-style formal list?)
> C:\Lino\PhD\2003\SummerWork\fltk\testCalculator\CalculatorGUI.cxx(6) : error
> C2653: 'CalculatorGUI' : is not a class or namespace name
> C:\Lino\PhD\2003\SummerWork\fltk\testCalculator\CalculatorGUI.cxx(6) : error
> C2062: type 'void' unexpected
> C:\Lino\PhD\2003\SummerWork\fltk\testCalculator\CalculatorGUI.cxx(6) : error
> C2143: syntax error : missing ';' before '{'
> C:\Lino\PhD\2003\SummerWork\fltk\testCalculator\CalculatorGUI.cxx(6) : error
> C2447: missing function header (old-style formal list?)
> C:\Lino\PhD\2003\SummerWork\fltk\testCalculator\CalculatorGUI.cxx(10) :
> error C2653: 'CalculatorGUI' : is not a class or namespace name
> C:\Lino\PhD\2003\SummerWork\fltk\testCalculator\CalculatorGUI.cxx(10) :
> error C2062: type 'void' unexpected
> C:\Lino\PhD\2003\SummerWork\fltk\testCalculator\CalculatorGUI.cxx(10) :
> error C2143: syntax error : missing ';' before '{'
> C:\Lino\PhD\2003\SummerWork\fltk\testCalculator\CalculatorGUI.cxx(10) :
> error C2447: missing function header (old-style formal list?)
> C:\Lino\PhD\2003\SummerWork\fltk\testCalculator\CalculatorGUI.cxx(13) :
> error C2653: 'CalculatorGUI' : is not a class or namespace name
> C:\Lino\PhD\2003\SummerWork\fltk\testCalculator\CalculatorGUI.cxx(13) :
> error C2062: type 'void' unexpected
> C:\Lino\PhD\2003\SummerWork\fltk\testCalculator\CalculatorGUI.cxx(13) :
> error C2143: syntax error : missing ';' before '{'
> C:\Lino\PhD\2003\SummerWork\fltk\testCalculator\CalculatorGUI.cxx(13) :
> error C2447: missing function header (old-style formal list?)
> C:\Lino\PhD\2003\SummerWork\fltk\testCalculator\CalculatorGUI.cxx(17) :
> error C2653: 'CalculatorGUI' : is not a class or namespace name
> C:\Lino\PhD\2003\SummerWork\fltk\testCalculator\CalculatorGUI.cxx(17) :
> error C2065: 'Fl_Button' : undeclared identifier
>
>
> ----- Original Message -----
> From: "Luis Ibanez" <luis . ibanez at kitware . com>
> To: "Lino Ramirez" <ramirez at ece . ualberta . ca>
> Cc: <insight-users at itk . org>
> Sent: Wednesday, November 05, 2003 2:17 PM
> Subject: Re: [Insight-users] Problems building the example from
> "Introduction to FLTK" by Luis Ibanez
>
>
>
>>
>>Hi Lino,
>>
>>
>>"Unresolved external" almost always means that you are
>>missing to link with a library. The list of unresolved
>>symbols usually indicates what libraries are missing.
>>
>>In your case, the missing symbols are fundamental
>>FLTK ones, like Fl::run(). This means that you are
>>missing the basic FLTK libraries.
>>
>>Simply add the following CMake command to your
>>CMakeList.txt file.
>>
>>
>>TARGET_LINK_LIBRARIES( TestCalculator ${FLTK_LIBRARIES})
>>
>>
>>Then Rerun CMake, and rebuild your project.
>>
>>
>>BTW,
>>September 2001 was long time ago, :-)
>>
>>You will find more convenient to use the more recent material
>>we prepared for the ITK tutorials:
>>
>> http://www . itk . org/HTML/Tutorials . htm
>>
>>
>>Regards,
>>
>>
>>
>> Luis
>>
>>
>>-------------------
>>Lino Ramirez wrote:
>>
>>>Hello,
>>>
>>>
>>>
>>>I am trying to build the Example from “Introduction to FLTK” by Luis
>>>Ibanez (Sept 11, 2001) using Visual C++ 6.0.
>>>
>>>
>>>
>>>Here are the errors I am getting
>>>
>>>
>>>
>>>--------------------Configuration: TestCalculator - Win32
>>>Debug--------------------
>>>
>>>Compiling...
>>>
>>>main.cxx
>>>
>>>Linking...
>>>
>>>main.obj : error LNK2001: unresolved external symbol "public: static int
>>>__cdecl Fl::run(void)" (?run at Fl@@SAHXZ)
>>>
>>>main.obj : error LNK2001: unresolved external symbol "public: __thiscall
>>>CalculatorGUI::CalculatorGUI(void)" (??0CalculatorGUI@@QAE at XZ)
>>>
>>>main.obj : error LNK2001: unresolved external symbol "public: int
>>>__thiscall Fl_Valuator::value(double)" (?value at Fl_Valuator@@QAEHN at Z)
>>>
>>>main.obj : error LNK2001: unresolved external symbol "public: virtual
>>>__thiscall CalculatorGUI::~CalculatorGUI(void)"
>>
> (??1CalculatorGUI@@UAE at XZ)
>
>>>Debug/TestCalculator.exe : fatal error LNK1120: 4 unresolved externals
>>>
>>>Error executing link.exe.
>>>
>>>
>>>
>>>ALL_BUILD - 5 error(s), 0 warning(s)
>>>
>>>
>>>
>>
>>--------------------------------------------------------------------------
>
> -----------------------
>
>>>
>>>
>>>This is the CMakeLists.txt I am using
>>>
>>
>>--------------------------------------------------------------------------
>
> -----------------------
>
>>>PROJECT( TestCalculator )
>>>
>>>
>>>
>>>INCLUDE (${CMAKE_ROOT}/Modules/FindFLTK.cmake)
>>>
>>>
>>>
>>>INCLUDE_DIRECTORIES(
>>>
>>> ${FLTK_INCLUDE_PATH}
>>>
>>>
>>>
>>>)
>>>
>>>
>>>
>>>ADD_EXECUTABLE( TestCalculator main.cxx )
>>>
>>
>>--------------------------------------------------------------------------
>
> -----------------------
>
>>>
>>>
>>>Could anyone tell me where the problem is?
>>>
>>>
>>>
>>>Thank you,
>>>
>>>
>>>
>>>Lino Ramirez
>>>
>>>
>>>
>>>P.S. Below is the CalculatorGUI.fld file.
>>>
>>
>>--------------------------------------------------------------------------
>
> -----------------------
>
>>># data file for the Fltk User Interface Designer (fluid)
>>>
>>>version 1.0104
>>>
>>>do_not_include_H_from_C
>>>
>>>header_name {.h}
>>>
>>>code_name {.cxx}
>>>
>>>class CalculatorGUI {open : {public BaseCalculator}
>>>
>>>} {
>>>
>>> Function {CalculatorGUI()} {open
>>>
>>> } {
>>>
>>> Fl_Window CalculatorPanel {open
>>>
>>> xywh {509 160 282 221}
>>>
>>> code0 {\#include "BaseCalculator.h"}
>>>
>>> class CalculatorGUI visible
>>>
>>> } {
>>>
>>> Fl_Value_Input OperandAInputValue {
>>>
>>> label {A:}
>>>
>>> callback {SetOperandB( o->value );}
>>>
>>> xywh {25 25 25 25} align 132 maximum 10
>>>
>>> }
>>>
>>> Fl_Value_Input OperandBInputValue {
>>>
>>> label {B:}
>>>
>>> callback {SetOperandB( o->value );}
>>>
>>> xywh {105 25 25 25} align 68
>>>
>>> }
>>>
>>> Fl_Button {} {
>>>
>>> label {+}
>>>
>>> callback {Add();}
>>>
>>> xywh {60 25 25 25}
>>>
>>> }
>>>
>>> Fl_Value_Output ResultOutputValue {
>>>
>>> label {=}
>>>
>>> xywh {145 25 25 25}
>>>
>>> }
>>>
>>> }
>>>
>>> }
>>>
>>> Function {~CalculatorGUI()} {open return_type virtual
>>>
>>> } {}
>>>
>>> Function {show()} {open return_type virtual
>>>
>>> } {}
>>>
>>> Function {hide()} {open selected return_type virtual
>>>
>>> } {}
>>>
>>>}
>>>
>>
>>--------------------------------------------------------------------------
>
> -----------------------
>
>>>
>>>
>>>
>>>
>>
>>
>
>