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delphi 中获取文件大小
- 大概有这些方法可以获得文件大小
- FileSizeByName(需要引用IdGlobal单元)
- GetFileSize
- FileSize(不能获得正在使用的文件大小)
- FileSeek
- TFileStream.Size
- 下面是使用例子
- 1。FileSizeByName(需要引用IdGlobal单元)
- begin
- if OpenDialog1.Execute then
- begin
- ShowMessage(IntToStr(FileSizeByName(OpenDialog1.Filename)));
- end;
- 2。GetFileSize
- var
- FileHandle:integer;
- begin
- if OpenDialog1.Execute then
- begin
- FileHandle := FileOpen(OpenDialog1.FileName, 0);
- ShowMessage(IntToStr(GetFileSize(FileHandle, nil)));
- FileClose(FileHandle);
- end;
- 3。FileSize(不能获得正在使用的文件大小)
- var f: file;
- begin
- if OpenDialog1.Execute then
- begin
- AssignFile(f, OpenDialog1.FileName);
- Reset(f, 1);
- ShowMessage(IntToStr(FileSize(f)));
- CloseFile(f);
- end;
- 4。FileSeek
- var
- FileHandle:integer;
- begin
- if OpenDialog1.Execute then
- begin
- FileHandle := FileOpen(OpenDialog1.FileName, 0);
- ShowMessage(IntToStr(FileSeek(FileHandle,0,2)));
- FileClose(FileHandle);
- end;
- 5。TFileStream.Size
- var
- FS: TFileStream;
- begin
- if OpenDialog1.Execute then
- begin
- FS := TFileStream.Create(OpenDialog1.FileName, fmShareDenyNone);
- ShowMessage(IntToStr(FS.Size));
- FS.Free;
- end;
- 另在IdGlobalProtocols中有个FileSizeByName()的函数。
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