Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose: Checks to see if the user has completely viewed the EULA before activing the accept/decline radio buttons
//
//=============================================================================//
#include < windows.h >
#include < msi.h >
#include < msiquery.h >
#include <tchar.h>
#include <stdarg.h>
#include <stdio.h>
#include <commctrl.h>
#define CHILD_WINDOW_OF_LICENSE "vHackLicenseWindowSibling092304"
#define WINDOW_CLASS_OF_EULA_WINDOW "RichEdit20W"
#define ALLOWABLE_POS_FROM_BOTTOM 5
//-----------------------------------------------------------------------------
// Purpose: Call back function for EnumChildWindows
// Input : hwnd -
// lParam -
// Output : BOOL CALLBACK
//-----------------------------------------------------------------------------
BOOL CALLBACK EnumChildProc(HWND hwnd,LPARAM lParam)
{
TCHAR buf[100];
GetClassName( hwnd, (LPTSTR)&buf, 100 );
if ( _tcscmp( buf, _T( WINDOW_CLASS_OF_EULA_WINDOW ) ) == 0 )
{
*(HWND*)lParam = hwnd;
return FALSE;
}
return TRUE;
}
//-----------------------------------------------------------------------------
// Purpose: Context for searching sub windows...
//-----------------------------------------------------------------------------
struct FindParams_t
{
HWND wnd;
char searchtext[ 512 ];
};
//-----------------------------------------------------------------------------
// Purpose:
// Input : hwnd -
// lParam -
// Output : BOOL CALLBACK
//-----------------------------------------------------------------------------
BOOL CALLBACK EnumChildrenLookingForSpecialControl(HWND hwnd,LPARAM lParam)
{
FindParams_t *p = ( FindParams_t *)lParam;
char buf[ 512 ];
GetWindowText( hwnd, buf, sizeof( buf ) );
if ( !stricmp( buf, p->searchtext ) )
{
p->wnd = hwnd;
return FALSE;
}
return TRUE;
}
//-----------------------------------------------------------------------------
// Purpose:
// Input : hwnd -
// lParam -
// Output : BOOL CALLBACK
//-----------------------------------------------------------------------------
BOOL CALLBACK EnumChildWindowsProc(HWND hwnd, LPARAM lParam)
{
// Now search for the special hidden text control inside a top level window
FindParams_t *p = ( FindParams_t *)lParam;
FindParams_t special;
memset( &special, 0, sizeof( special ) );
strcpy( special.searchtext, p->searchtext );
EnumChildWindows( hwnd, EnumChildrenLookingForSpecialControl, (LPARAM)&special );
if ( special.wnd != NULL )
{
p->wnd = hwnd;
return FALSE;
}
return TRUE;
}
//-----------------------------------------------------------------------------
// Purpose: Finds given a root window, finds a child window which itself has a special child window with the specified text string as the window title.
// e.g.:
// if root == NULL (desktop), then you can search the top level dialogs (Half-Life 2 Setup,e.g.) for a subwindow with "vHackxxx" as the text, this would
// return the appropriate top level dialog.
// Input : root -
// *text -
// Output : HWND
//-----------------------------------------------------------------------------
HWND FindWindowHavingChildWithSpecifiedText( HWND root, char const *text )
{
FindParams_t params;
memset( &params, 0, sizeof( params ) );
strncpy( params.searchtext, text, sizeof( params.searchtext ) - 1 );
EnumChildWindows( root, EnumChildWindowsProc, (LPARAM)&params );
return params.wnd;
}
//-----------------------------------------------------------------------------
// Purpose:
// Input : *text -
// Output : HWND
//-----------------------------------------------------------------------------
HWND FindTopLevelWindowHavingChildWithSpecifiedText( char const *text )
{
return FindWindowHavingChildWithSpecifiedText( GetDesktopWindow(), text );
}
//***********************************************************
//** Custom action to check if the license is completly
//** viewed.
//**---------------------------------------------------------
//** Return values:
//** (1) Always returns success
//** (2) Sets the private property LicenseViewed when
//** the text is scrolled to near end.
//**---------------------------------------------------------
//** Usage:
//** (1) Find installer window by looking for child with specified text. Can't
//** just use window title because it's translated into foreign languages
//** (2) In the license agreement dialog, on the scrollable
//** text control event, call the custom action
//** CheckLicenseViewed using a DoAction
//** (3) For the Next button, modify the Enable
//** ControlCondition to include the property
//** LicenseViewed
//**---------------------------------------------------------
//***********************************************************
// Needs to be exported as non-__stdcall with C name mangling (no mangling)
extern "C" __declspec( dllexport ) UINT CheckLicenseViewed(MSIHANDLE hMSI)
{
HWND hWnd;
HWND hWndChild=NULL;
if (MsiEvaluateCondition(hMSI,"LicenseViewed")==MSICONDITION_FALSE)
{
hWnd = FindTopLevelWindowHavingChildWithSpecifiedText(CHILD_WINDOW_OF_LICENSE );
if (hWnd)
{
EnumChildWindows( hWnd, EnumChildProc, (LPARAM)&hWndChild );
if ( hWndChild )
{
SCROLLINFO sinfo;
memset( &sinfo, 0, sizeof( sinfo ) );
sinfo.cbSize=sizeof(sinfo);
sinfo.fMask=SIF_TRACKPOS | SIF_RANGE | SIF_POS | SIF_PAGE;
GetScrollInfo(hWndChild, SB_VERT, &sinfo);
//max range depends on page size
UINT MaxScrollPos = sinfo.nMax - ( sinfo.nPage - 1 );
//max less, say ALLOWABLE_POS_FROM_BOTTOM - an allowable max.
MaxScrollPos = MaxScrollPos - ALLOWABLE_POS_FROM_BOTTOM;
// THIS IS A HACK, but the RichEdit20W control has a bug where while the thumb is being dragged, the position doesn't
// get updated. In fact, it doesn't get updated until the next time
UINT nScrollPos = ::SendMessage(hWndChild, EM_GETTHUMB, 0, 0);
bool trackedPastEnd = false; // (UINT)sinfo.nTrackPos >= MaxScrollPos ? true : false;
bool positionedPastEnd = nScrollPos >= MaxScrollPos ? true : false;
// Note above, this method doesn't always work... but maybe it will work in win98 and the other won't, etc. etc.
bool positionedPastEnd2 = (UINT)sinfo.nPos >= MaxScrollPos ? true : false;
/*
HDC dc = GetDC( GetDesktopWindow() );
COLORREF oldColor = SetTextColor( dc, RGB( 255, 0, 0 ) );
char sz[ 256 ];
_snprintf( sz, sizeof( sz ), "max %i page %i msp %i track %u pos %u pos2 %u",
sinfo.nMax,
sinfo.nPage,
MaxScrollPos,
sinfo.nTrackPos,
sinfo.nPos,
nScrollPos );
RECT rc;
rc.left = 0;
rc.right = 1000;
rc.top = 20;
rc.bottom = 50;
DrawText( dc, sz, -1, &rc, DT_NOPREFIX );
SetTextColor( dc, oldColor );
ReleaseDC( GetDesktopWindow(), dc );
*/
if ( trackedPastEnd || positionedPastEnd || positionedPastEnd2 )
{
MsiSetProperty(hMSI, TEXT("LicenseViewed"), TEXT("1"));
}
else
{
MsiSetProperty(hMSI, TEXT("LicenseViewed"), NULL);
}
}
}
}
return ERROR_SUCCESS;
}