对文件进行写操作是这样打开文件的:
stream := TFileStream.Create(filename, fmCreate);
如果是只读文件,就会报错:Cannot create file filename.
现在要判断文件是否可写,出错就报详细的错误,如:文件为只读属性
目录为只读属性
目录不存在现在的问题是,如何得到文件或者目录的属性?包括只读/共享等
stream := TFileStream.Create(filename, fmCreate);
如果是只读文件,就会报错:Cannot create file filename.
现在要判断文件是否可写,出错就报详细的错误,如:文件为只读属性
目录为只读属性
目录不存在现在的问题是,如何得到文件或者目录的属性?包括只读/共享等
FileGetAttr('filename');得到属性值
procedure TFMForm.Properties1Click(Sender: TObject);
var
Attributes, NewAttributes: Word;
begin
with FileAttrForm do
begin
FileDirName.Caption := FileList.Items[FileList.ItemIndex];
{ set box caption }
PathName.Caption := FileList.Directory;
{ show directory name }
ChangeDate.Caption :=
DateTimeToStr(FileDateToDateTime(FileAge(FileList.FileName)));
Attributes := FileGetAttr(FileDirName.Caption);
{ read file attributes }
ReadOnly.Checked := (Attributes and faReadOnly) = faReadOnly;
Archive.Checked := (Attributes and faArchive) = faArchive;
System.Checked := (Attributes and faSysFile) = faSysFile;
Hidden.Checked := (Attributes and faHidden) = faHidden;
if ShowModal <> id_Cancel then { execute dialog box }
begin
NewAttributes := Attributes;
{ start with original attributes }
if ReadOnly.Checked then
NewAttributes := NewAttributes or faReadOnly
else
NewAttributes := NewAttributes andnot faReadOnly;
if Archive.Checked then
NewAttributes := NewAttributes or faArchive
else
NewAttributes := NewAttributes andnot faArchive;
if System.Checked then
NewAttributes := NewAttributes or faSysFile
else
NewAttributes := NewAttributes andnot faSysFile;
if Hidden.Checked then
NewAttributes := NewAttributes or faHidden
else
NewAttributes := NewAttributes andnot faHidden;
if NewAttributes <> Attributes then { if anything changed... }
FileSetAttr(FileDirName.Caption, NewAttributes);
{ ...write the new values }
end;
end;
end;
FileSetAttr('MyFile.sys', Attrs ?faHidden);A return value of -1 indicates that an error occurred.Note: See TSearchRec for a description of the individual attribute constants.
FileGetAttr('filename');得到属性值
procedure TFMForm.Properties1Click(Sender: TObject);
var
Attributes, NewAttributes: Word;
begin
with FileAttrForm do
begin
FileDirName.Caption := FileList.Items[FileList.ItemIndex];
{ set box caption }
PathName.Caption := FileList.Directory;
{ show directory name }
ChangeDate.Caption :=
DateTimeToStr(FileDateToDateTime(FileAge(FileList.FileName)));
Attributes := FileGetAttr(FileDirName.Caption);
{ read file attributes }
ReadOnly.Checked := (Attributes and faReadOnly) = faReadOnly;
Archive.Checked := (Attributes and faArchive) = faArchive;
System.Checked := (Attributes and faSysFile) = faSysFile;
Hidden.Checked := (Attributes and faHidden) = faHidden;
if ShowModal <> id_Cancel then { execute dialog box }
begin
NewAttributes := Attributes;
{ start with original attributes }
if ReadOnly.Checked then
NewAttributes := NewAttributes or faReadOnly
else
NewAttributes := NewAttributes andnot faReadOnly;
if Archive.Checked then
NewAttributes := NewAttributes or faArchive
else
NewAttributes := NewAttributes andnot faArchive;
if System.Checked then
NewAttributes := NewAttributes or faSysFile
else
NewAttributes := NewAttributes andnot faSysFile;
if Hidden.Checked then
NewAttributes := NewAttributes or faHidden
else
NewAttributes := NewAttributes andnot faHidden;
if NewAttributes <> Attributes then { if anything changed... }
FileSetAttr(FileDirName.Caption, NewAttributes);
{ ...write the new values }
end;
end;
end;
FileSetAttr('MyFile.sys', Attrs ?faHidden);A return value of -1 indicates that an error occurred.Note: See TSearchRec for a description of the individual attribute constants.
function FileAge(const FileName: string): Integer;
var
Handle: THandle;
FindData: TWin32FindData;
LocalFileTime: TFileTime;
begin
Handle := FindFirstFile(PChar(FileName), FindData);
if Handle <> INVALID_HANDLE_VALUE then
begin
Windows.FindClose(Handle);
if (FindData.dwFileAttributes and FILE_ATTRIBUTE_DIRECTORY) = 0 then
begin
FileTimeToLocalFileTime(FindData.ftLastWriteTime, LocalFileTime);
if FileTimeToDosDateTime(LocalFileTime, LongRec(Result).Hi,
LongRec(Result).Lo) then Exit;
end;
end;
Result := -1;
end;
begin
if (fileGetAttr('c:\autoexec.bat') and faReadOnly)=faReadOnly then
showMessage('文件只读!');
if (fileGetAttr('c:\autoexec.bat') and faSysFile)=faSysFile then
showMessage('系统只读!');
end;其他类似。