I:
今天整理了一下,把关于ScreenSaver的
两个未公开的API贴上来.ALL可以把他
加入到自己的ScreenSaver中,实现Password
功能.用VB的话需要自己改写一下或做个DLL.

// File : ssave.cpp  < Simple screen saver application >
// Author: Mr.Huang fei

#include <windows.h>
#include <tchar.h>

// .... (其他部分就省略了)

// Function declaration
UINT VerifyScreenSavePwd( HWND hParentWnd );
UINT ChangeScreenSavePwd( HWND hParentWnd );

// Function types for GetProcAddress
#define PwdChangePassword_PROFILE (UINT (__stdcall *)(  LPSTR, HWND,
                                                        DWORD, DWORD))
#define VerifyScreenSavePwd_PROFILE (UINT (__stdcall *)( HWND ))

////////////////////////////////////////////////////////////////////////
// Define:  UINT ChangeScreenSavePwd( HWND hParentWnd )
// Parameters:          hParentWnd      --- Handle to parent window
// Return:              0               --- Password changed ok
//                      1               --- User canceled
//                      2...            --- Error happened
//
// Author:              Mr.Huang fei
// Time:  5/29/1998
//
// Note:  the HWND can be NULL.
////////////////////////////////////////////////////////////////////////
UINT ChangeScreenSavePwd( HWND hParentWnd )
{
 UINT ret = 1;
 // Function address defination
 UINT (__stdcall * hookPwdChangePassword)
     ( LPSTR, HWND, DWORD, DWORD ); 

 // Load library
 HINSTANCE hMod = LoadLibrary( TEXT("MPR.DLL") );
 if( hMod == NULL )
  return GetLastError();

 // Clear pointer
 hookPwdChangePassword = NULL;

 // Get address of function
 hookPwdChangePassword = PwdChangePassword_PROFILE
                                 GetProcAddress
                             ( hMod, TEXT("PwdChangePasswordA") );
        if( hookPwdChangePassword == NULL )
        {
                FreeLibrary( hMod );
                return GetLastError();
        }

        // Call the function
     ret = hookPwdChangePassword( TEXT("SCRSAVE"), hParentWnd, NULL, NULL );

        ret = !ret;

        FreeLibrary( hMod );

        return ret;
}

////////////////////////////////////////////////////////////////////////
// Define:      UINT VerifyScreenSavePwd( HWND hParentWnd )
// Parameters:  hParentWnd      --- Handle to parent window
// Return:      0               --- Password is right
//              1               --- User canceled
//              2...            --- Error happened
//
// Author:              Mr.Huang fei
// Time:                6/1/1998
//
// Note:                the HWND can be NULL.
////////////////////////////////////////////////////////////////////////
UINT VerifyScreenSavePwd( HWND hParentWnd )
{
        UINT    ret = 1;
        // Function address defination
        UINT    (__stdcall * hookVerifyScreenSavePwd)( HWND ); 

        // Load library
        HINSTANCE       hMod = LoadLibrary( TEXT("PASSWORD.CPL") );
        if( hMod == NULL )
                return GetLastError();

        // Clear pointer
        hookVerifyScreenSavePwd = NULL;

        // Get address of function
        hookVerifyScreenSavePwd =       VerifyScreenSavePwd_PROFILE
                                    GetProcAddress
                            ( hMod, TEXT("VerifyScreenSavePwd") );
        if( hookVerifyScreenSavePwd == NULL )
        {
                FreeLibrary( hMod );
                return GetLastError();
        }

        // Call the function
        ret = hookVerifyScreenSavePwd( hParentWnd );

        ret = !ret;

        FreeLibrary( hMod );

        return ret;
}