password.c

Go to the documentation of this file.

//
//  password.c
//
//  Password support for Win9x
//
#include <windows.h>
#include <tchar.h>
 
typedef BOOL (WINAPI *VERIFYSCREENSAVEPWD)(HWND hwnd);
typedef VOID (WINAPI *PWDCHANGEPASSWORD)(LPCTSTR lpcRegkeyname, HWND hwnd,UINT uiReserved1,UINT uiReserved2);
 
BOOL VerifyPassword(HWND hwnd)
{
    // Under NT, we return TRUE immediately. This lets the saver quit,
    // and the system manages passwords. Under '95, we call VerifyScreenSavePwd.
    // This checks the appropriate registry key and, if necessary,
    // pops up a verify dialog
 
    HINSTANCE           hpwdcpl;
    VERIFYSCREENSAVEPWD VerifyScreenSavePwd;
    BOOL                fResult;
 
    if(GetVersion() < 0x80000000)
        return TRUE;
 
    hpwdcpl = LoadLibrary(_T("PASSWORD.CPL"));
 
    if(hpwdcpl == NULL)
    {
        return FALSE;
    }
 
 
    VerifyScreenSavePwd = (VERIFYSCREENSAVEPWD)GetProcAddress(hpwdcpl, "VerifyScreenSavePwd");
 
    if(VerifyScreenSavePwd == NULL)
    {
        FreeLibrary(hpwdcpl);
        return FALSE;
    }
 
    fResult = VerifyScreenSavePwd(hwnd);
    FreeLibrary(hpwdcpl);
 
    return fResult;
}
 
BOOL ChangePassword(HWND hwnd)
{
    // This only ever gets called under '95, when started with the /a option.
    HINSTANCE hmpr = LoadLibrary(_T("MPR.DLL"));
    PWDCHANGEPASSWORD PwdChangePassword;
 
    if(hmpr == NULL)
        return FALSE;
 
    PwdChangePassword = (PWDCHANGEPASSWORD)GetProcAddress(hmpr, "PwdChangePasswordA");
 
    if(PwdChangePassword == NULL)
    {
        FreeLibrary(hmpr);
        return FALSE;
    }
 
    PwdChangePassword(_T("SCRSAVE"), hwnd, 0, 0);
    FreeLibrary(hmpr);
 
    return TRUE;
}