检查文件是否在使用中:
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;