Function SetDefaultExtension

extern/nfd/nfd_win.cpp:179–232

call after AddFiltersToDialog */

/* call after AddFiltersToDialog */
nfdresult_t SetDefaultExtension(::IFileDialog* fileOpenDialog,
                                const nfdnfilteritem_t* filterList,
                                nfdfiltersize_t filterCount) {
    // if there are no filters, then don't set default extensions
    if (!filterCount) {
        return NFD_OKAY;
    }

    assert(filterList);

    // set the first item as the default index, and set the default extension
    if (!SUCCEEDED(fileOpenDialog->SetFileTypeIndex(1))) {
        NFDi_SetError("Failed to set the selected file type index.");
        return NFD_ERROR;
    }

    // set the first item as the default file extension
    const nfdnchar_t* p_spec = filterList[0].spec;
    for (; *p_spec; ++p_spec) {
        if (*p_spec == ',') {
            break;
        }
    }
    if (*p_spec) {
        // multiple file extensions for this type (need to allocate memory)
        size_t numChars = p_spec - filterList[0].spec;
        // allocate one more char space for the '\0'
        nfdnchar_t* extnBuf = NFDi_Malloc<nfdnchar_t>(sizeof(nfdnchar_t) * (numChars + 1));
        if (!extnBuf) {
            return NFD_ERROR;
        }
        Free_Guard<nfdnchar_t> extnBufGuard(extnBuf);

        // copy the extension
        for (size_t i = 0; i != numChars; ++i) {
            extnBuf[i] = filterList[0].spec[i];
        }
        // pad with trailing '\0'
        extnBuf[numChars] = L'\0';

        if (!SUCCEEDED(fileOpenDialog->SetDefaultExtension(extnBuf))) {
            NFDi_SetError("Failed to set default extension.");
            return NFD_ERROR;
        }
    } else {
        // single file extension for this type (no need to allocate memory)
        if (!SUCCEEDED(fileOpenDialog->SetDefaultExtension(filterList[0].spec))) {
            NFDi_SetError("Failed to set default extension.");
            return NFD_ERROR;
        }
    }

    return NFD_OKAY;
}

nfdresult_t SetDefaultPath(IFileDialog* dialog, const nfdnchar_t* defaultPath) {
    if (!defaultPath || !*defaultPath) return NFD_OKAY;