How to realize button clicked in main function?

I created a dialog with "OK" and "Cancel" button using gnome. I tried to do as MFC:

if (dialog.DoModal() == IDOK) { // do my work}. But in GNOME I don't know how to realize

it in "main" function after gtk_main (). If you have any idea about that, please give me a message. Thanks!

Stacy

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