1:我想在OnShowUI中利用OnUnInstall事件删除前一版本。

2：但如何自动重新启动新版本的安装安装呢。在OnUnistall后在OnShowUI中直接调用 ONBEGIN/OnFirstUIBefore 等事件则提示：有另一个进程正在执行，请退出。不能自动重新启动安装程序。

一些是我的部分代码。请指正

function OnShowUI()
BOOL bMaintenanceMode, bUpdateMode;
string szIgnore, szTitle,szMsg;

begin


//bUnInstalled =TRUE;
//szTitle =sz1+gszVersionNo+sz2;
//Welcome ( szTitle, 0 );
//bKl_AllReInstalled =FALSE;
//flag_ReBegin:

// Enable dialog caching
Enable( DIALOGCACHE );

// Determine what events to show.
bUpdateMode = FALSE;
bMaintenanceMode = FALSE;

// Remove this to disabled update mode.
if( UPDATEMODE ) then
bUpdateMode = TRUE;
endif;
// Remove this to disable maintenance mode.
if ( MAINTENANCE ) then
bMaintenanceMode = TRUE;
endif;
// Show appropriate UI
// TODO: Enable if you want to enable background etc.
//if ( LoadStringFromStringTable( "TITLE_MAIN", szTitle ) < ISERR_SUCCESS ) then // Load the title string.
// szTitle = IFX_SETUP_TITLE;
//endif;
//SetTitle( szTitle, 24, WHITE );
//Enable( FULLWINDOWMODE );
//Enable( BACKGROUND );
//SetColor( BACKGROUND, RGB( 0, 128, 128 ) );
if( bUpdateMode ) then
OnUpdateUIBefore();
else
if ( bMaintenanceMode ) then
if(ReferenceFileIsUsing()<0)then
return -1;

endif;

szMsg = @IDS_UNINSTALLMESG; //ryy modify 0904
if(MessageBox( szMsg, MB_YESNO )==IDYES) then
//调用卸载程序
OnUninstall();

abort;
else
return -1;
endif;

else
OnFirstUIBefore();
endif;
endif;
//注册卸载键键值
ProcessBeforeDataMove();
// Move Data
OnMoveData();

//指定判别是否可以卸载文件
ProcessAfterDataMove();
//注册控件
SetupRegistry();

if( bUpdateMode ) then
OnUpdateUIAfter();
else
if ( bMaintenanceMode ) then
OnMaintUIAfter();
else
OnFirstUIAfter();
endif;
endif;

//if(bKl_AllReInstalled) then
//AllReInstalled();
//endif;
DestroyInstallFeatrueList();
// Disable dialog caching
Disable(DIALOGCACHE);
end;