Win32 API programming-call to close the computer dialog box

This function is called through an API function with an index of 60 in shell32.dll, and is implemented in the "close windows" dialog window. The specific method is to add the bn_clicked message processing function through the idc_shutdowncomputer button:
Void ccontroldlg: onshutdowncomputer ()
{
Hinstance hinst = loadlibrary ("shell32.dll"); // load shell32.dll
Shutdowndlg shutdowndialog; // pointer to the function in the shutdown dialog box displayed in the shell32 Database
If (hinst! = NULL)
{
// Obtain and call the function address
Shutdowndialog = (shutdowndlg) getprocaddress (hinst, (lpstr) 60 );//
(* Shutdowndialog) (0 );
}
}
The shutdowndlg in the function is defined as follows:
Typedef int (callback * shutdowndlg) (INT); // display the pointer of the function in the shutdown dialog box.