Inno Setup: Unable to delete folder during uninsta

Question

we are using delete, removedir, deltree functions to delete the files and folders during the uninstallation of our product. so some times these functions are unable to delete the files (mostly .lck files and sparse files), at that time the above functions are giving us just true/false boolean values, but we need the exact error behind the failure. So, is there any function to capture exact error messages?