cross platform native open/save file dialogs

In my opinion, wxWidgets is the open source, battle tested, mature, cross platform, cross language, free, open source, GUI library. Beside wxWidgets, there are also many other such cross platform libraries, such as:

• Tk
• FLTK
• FOX
• XUL
• AbiWord's cross platform layer

... and more.

You will most likely find you're looking for in the AbiWord source code. Look for "FileOpen" inside the src directory:

./af/xap/cocoa/xap_CocoaDlg_FileOpenSaveAs.cpp
./af/xap/cocoa/xap_CocoaDlg_FileOpenSaveAs.h
./af/xap/cocoa/xap_CocoaFileOpen_Views.nib
./af/xap/cocoa/xap_CocoaFileOpen_Views.nib/classes.nib
./af/xap/cocoa/xap_CocoaFileOpen_Views.nib/info.nib
./af/xap/cocoa/xap_CocoaFileOpen_Views.nib/keyedobjects.nib
./af/xap/gtk/xap_UnixDlg_FileOpenSaveAs.cpp
./af/xap/gtk/xap_UnixDlg_FileOpenSaveAs.h
./af/xap/win/xap_Win32Dlg_FileOpenSaveAs.cpp
./af/xap/win/xap_Win32Dlg_FileOpenSaveAs.h
./af/xap/xp/xap_Dlg_FileOpenSaveAs.cpp
./af/xap/xp/xap_Dlg_FileOpenSaveAs.h

The Windows version does indeed use GetOpenFileName().

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Of course, as Andre points out while downvoting a valid alternative answer, there's also Qt, as you already know. Refer to raj's answer for a link.

https://doc.qt.io/qt-5/qfiledialog.html provides a good abstraction of os file open services

You should take a good look at Native File Dialog. It is a small, portable C library that lets you use load and save dialogs in a cross platform manner without linking huge dependencies like qt or wxWidgets.

I am the author, and I use it with SDL2 and OpenGL on Linux, Mac and Windows.

https://github.com/mlabbe/nativefiledialog

tinyfiledialogs offers many modal dialogs and popup notifications (both for graphic and console modes). It is a cross-platform C file (with a header) to add to your C or C++ project. It aims to be extremely easy to use, has no init, no main loop, and no external dependencies. It is used by hundreds of projects on GitHub and of course, I am the author. Get it here: http://tinyfiledialogs.sourceforge.net

Usage example:

    char const * selection = tinyfd_openFileDialog( // there is also a wchar_t version
        "Select file", // title
        "C:\\", // optional initial directory
        2, // number of filter patterns
        lFilterPatterns, // char const * lFilterPatterns[2] = { "*.txt", "*.jpg" };
        NULL, // optional filter description
        0 // forbid multiple selections
        );