解决自动更新因为EXE文件正在运行而失败的问题

function IsFileInUse(FName:string):Boolean;  
var  
  HFileRes:HFILE;  
begin
  Result:=False;
  if not FileExists(FName) then
    Exit;
  HFileRes:=CreateFile(PChar(FName),GENERIC_READ or GENERIC_WRITE,0,
    nil,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,0);
  Result:=(HFileRes=INVALID_HANDLE_VALUE);
  if not Result then
    CloseHandle(HFileRes);
end;

function KillTask(ExeFileName: string): Integer;
const
  PROCESS_TERMINATE = $0001;
var
  ContinueLoop: boolean;
  FSnapshotHandle: THandle;
  FProcessEntry32: TProcessEntry32;
begin
  Result := 0;
  FSnapshotHandle := CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
  FProcessEntry32.dwSize := SizeOf(FProcessEntry32);
  ContinueLoop := Process32First(FSnapshotHandle, FProcessEntry32);

  while Integer(ContinueLoop) <> 0 do
  begin
  if ((UpperCase(ExtractFileName(FProcessEntry32.szExeFile)) =
  UpperCase(ExeFileName)) or (UpperCase(FProcessEntry32.szExeFile) =
  UpperCase(ExeFileName))) then
  Result := Integer(TerminateProcess(
  OpenProcess(PROCESS_TERMINATE,
  BOOL(0),
  FProcessEntry32.th32ProcessID),
  0));
  ContinueLoop := Process32Next(FSnapshotHandle, FProcessEntry32);
  end;
  CloseHandle(FSnapshotHandle);
end;

procedure CloseMainProcess(fileName: string);
begin
  if (ExtractFileExt(fileName)='.exe') or
    (ExtractFileExt(fileName)='.com') then
  begin
    if IsFileInUse(fileName) then
    begin
      KillTask(fileName);
    end; 
  end; 
end;