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Re: [fltk.general] FLTK on Visual Studio 2019 x64, "Cannot open include file: 'dirent.h': No such file or directory
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Re: FLTK on Visual Studio 2019 x64, "Cannot open include file: 'dirent.h': No such file or directory "lifeatt... May 06, 2021  
  Also using DUMPBIN, you can confirm what the symbols are inside your library.

For instance, from your error list:

Error LNK2019 unresolved external symbol "public: virtual __cdecl Fl_Widget::~Fl_Widget(void)" (??1Fl_Widget@@UEAA@XZ) referenced in function "public: virtual __cdecl Fl_Box::~Fl_Box(void)" (??1Fl_Box@@UEAA@XZ) VirtualAdvertisement C:\Users\Tom\source\repos\VirtualAdvertisement\VirtualAdvertisement\MainWindow.obj 1

Using Dumpbin, I searched for "Fl_Widget::~Fl_Widget(void)" in both the 32-bit and 64-bit versions of fltk.lib:

64-bit
dumpbin /symbols fltk.lib | find "Fl_Widget::~Fl_Widget" | more
04B 00000000 SECT5  notype ()    External     | ??1Fl_Widget@@UEAA@XZ (public: virtual __cdecl Fl_Widget::~Fl_Widget(void))

32-bit
dumpbin /symbols fltk.lib | find "Fl_Widget::~Fl_Widget" | more
065 00000000 SECT5  notype ()    External     | ??1Fl_Widget@@UAE@XZ (public: virtual __thiscall Fl_Widget::~Fl_Widget(void))

In your build, the linker is looking for ??1Fl_Widget@@UEAA@XZ which can be found in the 64-bit version, not the 32-bit version. Another confirmation that you are compiling your code as 64-bit but linking against a 32-bit version of fltk.lib.

I had difficulties making both the 32-bit and 64-bit versions of fltk because I was creating new configurations from within Visual Studio. I found that I had to check the Project Properties to confirm the settings were correct. For instance, I had to check both "Advanced \ Preferred Build Tool Architecture" AND "Librarian \ Additional Options" to insure consistent settings. 


Kevin

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