判断文件大小的函数

function GetFileSize(const FileName: String): LongInt;
var SearchRec: TSearchRec;
begin
  if FindFirst(ExpandFileName(FileName), faAnyFile, SearchRec) = 0 then
   Result := SearchRec.Size
  else
   Result := -1;
end;

//按书上所说,函数都是具有返回值的,它这else返回的是-1,超出2GB?
//那么这样对不对呢?

function GetFileSize(const FileName: String): Int64;
var SearchRec: TSearchRec;
begin
  if FindFirst(ExpandFileName(FileName), faAnyFile, SearchRec) = 0 then
   Result := SearchRec.Size
  else
   Result := -1;
end;