Method nativeFileDialog

src/Gui/FileDialogWin32.cpp:252–434

Try using the Vista+ IFileDialog APIs first with the private interfaces, * falling back to legacy functions if said private APIs aren't available. * * Note neither IFileDialog or the legacy functions are valid for UWP WinRT, * for which Windows::Storage::Pickers::FileOpenPicker will have to be used instead. */

 * for which Windows::Storage::Pickers::FileOpenPicker will have to be used instead.
 */
QStringList FileDialogInternal::nativeFileDialog(
    NativeFileDialogMode mode,
    QWidget* parent,
    const QString& caption,
    const QString& startPath,
    const FileDialog::FilterList& filters,
    qsizetype& selectedFilterIndex,
    FileDialog::Options options
)
{
    ComRuntime com;
    const bool isOpen = mode == NativeFileDialogMode::OpenSingle
        || mode == NativeFileDialogMode::OpenMultiple;

    ComPointer<IFileDialog> fileDialog;
    if (FAILED(CoCreateInstance(
            isOpen ? CLSID_FileOpenDialog : CLSID_FileSaveDialog,
            nullptr,
            CLSCTX_INPROC_SERVER,
            isOpen ? IID_IFileOpenDialog : IID_IFileSaveDialog,
            fileDialog.ppvObject()
        ))) {
        Base::Console().warning("Failed to create IFileDialog, falling back on GetOpen/SaveFileNameW");
        return legacyNativeFileDialog(mode, parent, caption, startPath, filters, selectedFilterIndex, options);
    }

    // These aren't wrapped interfaces, can't use ComPointer on them
    IFileDialogPrivate_W10* w10;
    IFileDialogPrivate_W7* w7;
    // Set the private flag to hide filter patterns
    if (SUCCEEDED(
            fileDialog->QueryInterface(IID_IFileDialogPrivate_W10, reinterpret_cast<void**>(&w10))
        )) {
        FileDialogPrivateOptions flags;
        w10->lpVtbl->GetPrivateOptions(w10, &flags);
        w10->lpVtbl->SetPrivateOptions(w10, flags | FDPO_DONT_FORCE_SHOW_EXTS);
        w10->lpVtbl->Release(w10);
    }
    else if (
        SUCCEEDED(fileDialog->QueryInterface(IID_IFileDialogPrivate_W7, reinterpret_cast<void**>(&w7)))
    ) {
        FileDialogPrivateOptions flags;
        w7->lpVtbl->GetPrivateOptions(w7, &flags);
        w7->lpVtbl->SetPrivateOptions(w7, flags | FDPO_DONT_FORCE_SHOW_EXTS);
        w7->lpVtbl->Release(w7);
    }
    else {
        // No private API, fall back to legacy and emit warning
        Base::Console()
            .warning("FileDialog fell back on legacy GetOpen/SaveFileNameW, the IFileDialog private API needs to be updated");
        return legacyNativeFileDialog(mode, parent, caption, startPath, filters, selectedFilterIndex, options);
    }

    // Populate file filters
    const bool showPatterns = getPreferShowFilterPatterns();
    std::vector<std::pair<QString, QString>> qstringFilterSpecs;
    qstringFilterSpecs.reserve(filters.size());
    qsizetype totalStringLength = 0;