restore check of show ui

twain/huagaods.cpp

@@ -828,6 +828,7 @@ int  huagao_ds::on_scanner_event(int ev, void* param)
 
 const Identity& huagao_ds::defaultIdentity() noexcept {
 	// remember, we return a reference, therefore the identity must not be placed on the stack of this method
+
 	return *srcIdent;
 }
 Result huagao_ds::selectIdentity(Twpp::Identity& ident) noexcept {
@@ -1019,6 +1020,8 @@ Result huagao_ds::identityOpenDs(const Identity& id)
 	m_fileXfer.setFormat(ImageFileFormat::Bmp);
 	scanner_status_ = SCANNER_STATUS_READY;
 
+	log_mem_info("srcIdent:", srcIdent, sizeof(*srcIdent));
+	
 	return success();
 }
 Result huagao_ds::identityCloseDs(const Identity&)
@@ -1124,7 +1127,7 @@ Result huagao_ds::userInterfaceEnable(const Identity&, UserInterface& ui)
 	bUiOnly_ = false;
 	show_setting_ = false;
 	scanner_->twain_set_transfer((twain_xfer)m_capXferMech);
-	// if (!ui.showUi())
+	if (!ui.showUi())
 	{
 		scanner_->ui_show_progress((HWND)ui.parent().raw(), m_bIndicator);
 		//if (m_bIndicator && !)

twain/scanner.cpp

@@ -291,7 +291,9 @@ namespace callback
 		{
 #define GET_API(api)		\
 	proc = (FARPROC*)&api;	\
-	*proc = GetProcAddress(hui, #api);
+	*proc = GetProcAddress(hui, #api);	\
+	if(*proc == nullptr)	\
+		utils::to_log(LOG_LEVEL_FATAL, "TWAINUI - function '%s' not found!\n", #api);
 
 			FARPROC* proc = nullptr;
 
@@ -2897,6 +2899,7 @@ COM_API_IMPLEMENT(scanner, bool, ui_show_main(HWND parent))
 }
 COM_API_IMPLEMENT(scanner, bool, ui_show_setting(HWND parent, bool with_scan, bool indicator))
 {
+	printf("ui_show_setting(%p, %s, %s), api = %p\n", parent, with_scan ? "with scan" : "only ui", indicator ? "has indicator" : "no indicator", callback::show_setting_ui);
 	is_show_ui_ = with_scan;
 	is_show_setting_ = true;
 	events_.clear();