Question

我的效用是比较来源和目的地档案日期/时间。在大多数情况下,这都是在比较不同时区档案的日期/时间时失败的。因此,我需要一个UTC日常工作。

视视之,视窗APICTI GetFiletime将支持这项工作。我也发现了这一包裹程序,但在2010年Delphi汇编时,它坠毁了GetFiletime电话。

任何想法? 或者,任何人都有一套处理美国金枪鱼养护委时间区的法规,因此,如果存在不同,我可以把2个名字传给我?

function CompareFileTimes(File1, File2 : String) : LongInt;
var
  F1, F2          : THandle;
  F1_CreateTime,
  F1_LastAccess,
  F1_LastWrite,
  F2_CreateTime,
  F2_LastAccess,
  F2_LastWrite    : PFileTime;
begin
  //Initialize all variables
  F1 := 0;
  F2 := 0;

  //Since these are pointers, we have to
  //allocate memory for the FileTime structures
  GetMem(F1_CreateTime, SizeOf(TFileTime));
  GetMem(F1_LastAccess, SizeOf(TFileTime));
  GetMem(F1_LastWrite, SizeOf(TFileTime));
  GetMem(F2_CreateTime, SizeOf(TFileTime));
  GetMem(F2_LastAccess, SizeOf(TFileTime));
  GetMem(F2_LastWrite, SizeOf(TFileTime));

  //Fill the structures with nulls for now
  FillChar(F1_CreateTime, SizeOf(TFileTime), #0);
  FillChar(F1_LastAccess, SizeOf(TFileTime), #0);
  FillChar(F1_LastWrite, SizeOf(TFileTime), #0);
  FillChar(F2_CreateTime, SizeOf(TFileTime), #0);
  FillChar(F2_LastAccess, SizeOf(TFileTime), #0);
  FillChar(F2_LastWrite, SizeOf(TFileTime), #0);

  //Get file handles for the files in question
  //Notice that even though we re using CreateFile
  //the open disposition for the file is OPEN_EXISTING
  F1 := CreateFile(PChar(F1), 0, FILE_SHARE_READ, nil, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
  F2 := CreateFile(PChar(F2), 0, FILE_SHARE_READ, nil, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);

  //Get the file times for the files.
  GetFileTime(F1, F1_CreateTime, F1_LastAccess, F1_LastWrite);
  GetFileTime(F2, F2_CreateTime, F2_LastAccess, F2_LastWrite);

  //Assign the function s result to comparison
  //-1, File1 is younger than File2
  //0, File1 is the same as File2
  //+1 File1 is older than File2
  Result := CompareFileTime(F1_CreateTime^, F2_CreateTime^);

  //Free the memory allocated to the pointers
  FreeMem(F1_CreateTime, SizeOf(TFileTime));
  FreeMem(F1_LastAccess, SizeOf(TFileTime));
  FreeMem(F1_LastWrite, SizeOf(TFileTime));
  FreeMem(F2_CreateTime, SizeOf(TFileTime));
  FreeMem(F2_LastAccess, SizeOf(TFileTime));
  FreeMem(F2_LastWrite, SizeOf(TFileTime));
end;

任何帮助都将受到高度赞赏。

Answer 1

《2010年德尔菲》已经包含一个容易的包裹,可以让世界金枪鱼委的时间用于奥料。 pas。这里是比较UTC生成时间的法典的一部分。

uses
  IOUtils, DateUtils;

function CompareFileCreationTimeUtc(const aFile1, aFile2: String): integer;
var
  lCreationTime1: TDateTime;
  lCreationTime2: TDateTime;
begin

  lCreationTime1 := TFile.GetCreationTimeUtc(aFile1);
  lCreationTime2 := TFile.GetCreationTimeUtc(aFile2);

  Result := CompareDateTime(lCreationTime1, lCreationTime2);

end;

Answer 2

如果你不希望使用常规和习惯做法,那么你的职能应当像(未测试)一样加以纠正。

function CompareFileTimes(File1, File2 : String) : LongInt;
var
  F1, F2: THandle;
  F1_CreateTime, F2_CreateTime: TFileTime;
begin
  //Fill the structures with nulls for now
  ZeroMemory(@F1_CreateTime, SizeOf(TFileTime));
  ZeroMemory(@F2_CreateTime, SizeOf(TFileTime));

  //Get file handles for the files in question
  //Notice that even though we re using CreateFile
  //the open disposition for the file is OPEN_EXISTING
  F1 := CreateFile(PChar(File1), 0, FILE_SHARE_READ , nil, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
  F2 := CreateFile(PChar(File2), 0, FILE_SHARE_READ, nil, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);

  if (F1=INVALID_HANDLE_VALUE) or (F1=INVALID_HANDLE_VALUE) then
    RaiseLastOSError;

  //Get the file times for the files.
  if not GetFileTime(F1, @F1_CreateTime, nil, nil) or
     not GetFileTime(F2, @F2_CreateTime, nil, nil) then
    RaiseLastOSError;
  //Assign the function s result to comparison
  //-1, File1 is younger than File2
  //0, File1 is the same as File2
  //+1 File1 is older than File2
  Result := CompareFileTime(F1_CreateTime, F2_CreateTime);
end;

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