Problem getting Cimgui to work

[drug]

06.12.2017 20:51, Thomas пишет:
> Hi guys!
> 
> I need some help or advice about Cimgui (a C-API for Imgui) because I 
> have no idea how to get it working.
> 
> First, I'm new to D (only a few weeks) and still learning. I have a 
> small C++/C# background, but wanted to try something new. So D got into 
> my focus.
> I am working on Manjaro Linux btw.
> 
> Since 2 weeks I am working on a small project of mine to test the SDL2 
> functions with derelict. Until now everything worked just fine and I got 
> my first window in SDL.
> For this I have installed all SDL library and development files with the 
> package manager of Manjaro Linux. Even GLFW.
> 
> To fill the SDL window with some widgets I have decided to try Imgui via 
> Cimgui.
> My first approach was to use the derelict-imgui version 0.9.4 over DUB.
> import derelict.imgui.imgui; has been accepted yet, but 
> DerelictImgui.load(); not
> 
> While compiling I got the following error message:
> 
> derelict.util.exception.SharedLibLoadException at ../../.dub/packages/derelict-util-3.0.0-beta.2/derelict-util/source/derelict/util/sharedlib.d(158): 
> Failed to load one or more shared libraries:
>      cimgui.so - cimgui.so: cannot open shared object file: No such file 
> or directory
> 
> so Cimgui was missing..
> 
> Ok, so in a second attempt I downloaded Cimgui as a ZIP and also the 
> Imgui files from the homepage into the appropriate directory and 
> unzipped them. First, the compiling via make doesn't wanted to compile:
> 
> 
> cimgui.cpp: In Funktion »void ImGuiTextBuffer_append(ImGuiTextBuffer*, 
> const char*, ...)«:
> cimgui.cpp:1716:13: Fehler: »struct ImGuiTextBuffer« hat kein Element 
> namens »appendv«; meinten Sie »appendf«?
>       buffer->appendv(fmt, args);
> 
> 
> Translated from german -> "there is no element appendv in ImGuiTextBuffer"
> 
> So I changed the code myself on that position by replacing "appendv" 
> with "appendf"
> That worked fine. But next problem was this:
> 
> 
> /usr/bin/ld: ../imgui/imgui.o: relocation R_X86_64_PC32 against symbol 
> `_ZN6ImVec2C1Eff' can not be used when making a shared object; recompile 
> with -fPIC
> /usr/bin/ld: final link failed: Bad value
> 
> 
> After some research I found out it meant that the imgui files had not 
> been compiled with -fPIC to be used as a shared library. So I deleted 
> all .o files in the imgui directory and recompiled
> imgui.cpp
> imgui_draw.cpp and
> imgui_demo.cpp
> each with "g++ -c -fPIC -pie"
> So I copied the new compiled .o files to the cimgui project and 
> recompiled it again.
> This time it worked without problems :-)
> 
> The new shared library file cimgui.so moved to my project directory and 
> exported LD_LIBRARY_PATH so it could be found by the compiler.
> This time the compiler cried this error:
> 
> 
> derelict.util.exception.SymbolLoadException at ../../.dub/packages/derelict-util-3.0.0-beta.2/derelict-util/source/derelict/util/sharedlib.d(181): 
> Failed to load symbol igPushIdPtr from shared library cimgui.so
> ----------------
> ??:? void* 
> derelict.util.sharedlib.SharedLib.loadSymbol(immutable(char)[], bool) 
> [0xcfec77a6]
> ??:? void* 
> derelict.util.loader.SharedLibLoader.loadSymbol(immutable(char)[], bool) 
> [0xcfec5cce]
> ??:? void derelict.util.loader.SharedLibLoader.bindFunc(void**, 
> immutable(char)[], bool) [0xcfec5978]
> ??:? void derelict.imgui.imgui.DerelictImguiLoader.loadSymbols() 
> [0xcfebe7a5]
> ??:? void derelict.util.loader.SharedLibLoader.load(immutable(char)[][]) 
> [0xcfec5b4e]
> ??:? void derelict.util.loader.SharedLibLoader.load(immutable(char)[]) 
> [0xcfec5ac8]
> ??:? void derelict.util.loader.SharedLibLoader.load() [0xcfec59ab]
> ??:? _Dmain [0xcfeae0af]
> Program exited with code 1
> 
> 
> After some research again I found a workaround on the Derelict Util 
> homepage:
> 
> 
> 
> import derelict.util.exception : ShouldThrow;
> 
> ShouldThrow myMissingSymbCB( string symbolName )
> {
>          if ( symbolName == "igSetNextWindowPosCenter" ||
>               symbolName == "igAlignFirstTextHeightToWidgets" ||
>               symbolName == "igPushIdStr" ||
>               symbolName == "igPushIdStrRange" )
>          {
>              return ShouldThrow.No;
>          }
>          else
>          {
>              return ShouldThrow.Yes;
>          }
> }
> 
> int main()
> {
>      DerelictImgui.missingSymbolCallback = &myMissingSymbCB;
>      DerelictImgui.load();
> }
> 
> 
> But with each attempt to compile my project with "dub" by adding the 
> next symbol name into the list above a new symbol fails to load. Again 
> and again.
> 
> Since 1 week I tried several ways to get the libray to work. 
> Unfortunately without success.
> 
> Because I couldn't find any relevant information on the internet about 
> this problem I hope to get a solution here. Maybe someone (an Cimgui 
> expert here?) can give me a step by step instruction how to compile the 
> library properly ?
> 
> Thank you!
Could you describe what dub package you tried to build first of all? It 
helps to reproduce your case.