How to load and save StringGrid content? - delphi

Question

First part of the code works OK while the second (commented) does not.
It overwrites my A1 file although it should write to A2.
procedure TForm1.AdvGlowButton12Click(Sender: TObject);
var
i,j: Integer;
Seznam: TStrings;
ApplicationPath: string;
begin
if (cxRadiogroup3.ItemIndex and cxRadiogroup2.ItemIndex) = 0 then begin
ApplicationPath:= ExtractFileDir(Application.ExeName);
Seznam:= TStringList.Create;
try
for i:=0 to advStringGrid2.ColCount-1 do
Seznam.AddStrings(advStringGrid2.Cols [i]);
for i:=0 to advStringGrid2.rowCount-1 do
Seznam.AddStrings(advStringGrid2.rows [j]);
Seznam.SaveToFile(ApplicationPath+'\A1.txt');
finally
seznam.free;
end;
end ;
//if cxRadiogroup3.ItemIndex = 1 and cxRadiogroup2.ItemIndex = 0 then begin
// ApplicationPath:= ExtractFileDir(Application.ExeName);
// Seznam:= TStringList.Create;
// try
// for i:=0 to advStringGrid2.ColCount-1 do
// Seznam.AddStrings(advStringGrid2.Cols [i]);
// for i:=0 to advStringGrid2.rowCount-1 do
// Seznam.AddStrings(advStringGrid2.rows [j]);
// Seznam.SaveToFile(ApplicationPath+'\A2.txt');
// finally
// seznam.free;
// end ;
//end
end;
What am I doing wrong ?
Also why is the stringgrid giving listindex out of bounds when I try to load into it contents from an empty text file? If I save empty stringgrid to that file,later ,though it has nothing in the file,it does not complain? Strange...
This is how I load A1 and A2 into the stringgrid.
procedure TForm1.cxRadioGroup2Click(Sender: TObject);
Var
I,j,k: Integer;
Seznam: TStrings;
ApplicationPath: string;
begin
case cxradioGroup2.ItemIndex of
0: begin
if cxradioGroup3.ItemIndex = 0 then begin
Seznam:= TStringList.Create;
AdvStringgrid2.ClearAll;
try
Seznam.LoadFromFile('A1.txt');
k:= 0;
for i:=0 to advStringGrid2.ColCount-1 do
for j:=0 to advStringGrid2.RowCount-1 do begin
advstringGrid2.Cells [i,j]:= Seznam.Strings [k];
Inc(k);
end;
finally
seznam.free;
end;
end;
if cxradioGroup3.ItemIndex = 1 then begin
Seznam:= TStringList.Create;
AdvStringgrid2.ClearAll;
try
Seznam.LoadFromFile('A2.txt');
k:=0;
for i:=0 to advStringGrid2.ColCount-1 do
for j:=0 to advStringGrid2.RowCount-1 do begin
advstringGrid2.Cells [i,j]:= Seznam.Strings [k];
Inc(k);
end;
finally
seznam.free;
end;
end;
end;
end;
end;

Answer 1

here is an old tipp from SwissDelphiCenter that could help you
// Save StringGrid1 to 'c:\temp.txt':
procedure TForm1.Button1Click(Sender: TObject);
begin
SaveStringGrid(StringGrid1, 'c:\temp.txt');
end;
// Load StringGrid1 from 'c:\temp.txt':
procedure TForm1.Button2Click(Sender: TObject);
begin
LoadStringGrid(StringGrid1, 'c:\temp.txt');
end;
// Save a TStringGrid to a file
procedure SaveStringGrid(StringGrid: TStringGrid; const FileName: TFileName);
var
f: TextFile;
i, k: Integer;
begin
AssignFile(f, FileName);
Rewrite(f);
with StringGrid do
begin
// Write number of Columns/Rows
Writeln(f, ColCount);
Writeln(f, RowCount);
// loop through cells
for i := 0 to ColCount - 1 do
for k := 0 to RowCount - 1 do
Writeln(F, Cells[i, k]);
end;
CloseFile(F);
end;
// Load a TStringGrid from a file
procedure LoadStringGrid(StringGrid: TStringGrid; const FileName: TFileName);
var
f: TextFile;
iTmp, i, k: Integer;
strTemp: String;
begin
AssignFile(f, FileName);
Reset(f);
with StringGrid do
begin
// Get number of columns
Readln(f, iTmp);
ColCount := iTmp;
// Get number of rows
Readln(f, iTmp);
RowCount := iTmp;
// loop through cells & fill in values
for i := 0 to ColCount - 1 do
for k := 0 to RowCount - 1 do
begin
Readln(f, strTemp);
Cells[i, k] := strTemp;
end;
end;
CloseFile(f);
end;
I'm trying to understand your code and tried him as good as it is possible for me to rewrite. (it's not tested)
procedure TForm1.AdvGlowButton12Click(Sender: TObject);
var
i, j: Integer;
Seznam: TStrings;
ApplicationPath: string;
fileName: string;
line: string;
begin
if (cxRadiogroup2.ItemIndex = 0) then begin
if (cxRadiogroup3.ItemIndex = 0) then
fileName:= 'A1.txt'
else
fileName:= 'A2.txt'
ApplicationPath:= ExtractFileDir(Application.ExeName);
Seznam:= TStringList.Create;
try
for k:=0 to advStringGrid2.RowCount-1 do begin
line:= '';
for i:=0 to advStringGrid2.ColCount-1 do
line = line + '|' + advStringGrid2.Cells[i, k];
Seznam.AddStrings(line);
end;
Seznam.SaveToFile(ApplicationPath + '\' + fileName);
finally
seznam.Free;
end;
end;
end;
procedure TForm1.cxRadioGroup2Click(Sender: TObject);
var
splitList: TStringList;
i, j: Integer;
Seznam: TStrings;
ApplicationPath: string;
fileName: string;
line: string;
sepIndex: integer;
begin
if (cxRadiogroup2.ItemIndex = 0) then begin
if (cxRadiogroup3.ItemIndex = 0) then
fileName:= 'A1.txt'
else
fileName:= 'A2.txt'
AdvStringgrid2.ClearAll; // don't know what this does
ApplicationPath:= ExtractFileDir(Application.ExeName);
Seznam:= TStringList.Create;
try
Seznam.LoadFromFile(fileName);
advstringGrid2.RowCount:= Seznam.Count;
splitList:= TStringList.Create;
for i:=0 to Seznam.Count-1 do begin
line:= Seznam.Strings [i];
Split('|', line, splitList);
advStringGrid2.ColCount:= Max(advStringGrid2.ColCount, splitList.Count);
for k:=0 to splitList.Count-1 do
advStringGrid2.Cells[i, k]:= splitList[k];
end;
finally
splitList.Free;
seznam.Free;
end;
end;
end;
procedure Split (const Delimiter: Char; Input: string; const Strings: TStrings);
begin
Assert(Assigned(Strings));
Strings.Clear;
Strings.Delimiter:= Delimiter;
Strings.DelimitedText:= Input;
end;
hope that helps

Answer 2

How do you know it is overwriting A1.txt? You are saving the exact same contents in both cases.

Answer 3

Founded and adapted to my needs. Then shared :-)
procedure LoadStringGrid(const AFileName: TFileName; AGrid: TStringGrid);
var
slRows: TStringList;
i: integer;
begin
slRows:= TStringList.Create;
try
slRows.LoadFromFile(AFileName);
for i:= 0 to slRows.Count -1 do
AGrid.Rows[i +1].CommaText:= slRows[i];
finally
slRows.Free;
end;
end;// LoadStringGrid
procedure SaveStringGrid(const AFileName: TFileName; AGrid: TStringGrid);
var
slRows: TStringList;
i: integer;
begin
slRows:= TStringList.Create;
try
for i:= 1 to AGrid.RowCount -1 do
slRows.Add(AGrid.Rows[i].CommaText);
slRows.SaveToFile(AFileName);
finally
slRows.Free;
end;
end;// SaveStringGrid