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error msg when reading data from registry

Posted on 2004-09-10
5
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Last Modified: 2010-04-05
when i reading the data from the registry i got the following error: "EConvertError".

this code writes the data to registry:
procedure TForm1.FormDestroy(Sender: TObject);
var clbx: integer;
    buf: string;
begin
 with TRegistry.Create do begin
  RootKey := HKEY_CURRENT_USER;
  try
  if OpenKey('\Software\Test\', True) then begin
   for clbx := 0 to CheckListBox1.Items.Count - 1 do begin
    if CheckListBox1.Checked[clbx] = True then buf := buf + IntToStr(clbx) + ' ';
   end;
   WriteString('items', buf);
  end;
  finally
  CloseKey;
  Free;
  end;
 end;
end;

this code reads the data:
procedure TForm1.FormCreate(Sender: TObject);
var buf: string;
    intbuf: integer;
begin
 with TRegistry.Create do begin
  RootKey := HKEY_CURRENT_USER;
  try
  if OpenKey('\Software\Test\', false) then begin
    buf := ReadString('items');
    for intbuf := 0 to Length(buf) - 1 do begin
     if buf[intbuf] <> ' ' then CheckListBox1.Checked[StrToInt(buf[intbuf])] := True;
    end;
  end;
  finally
  CloseKey;
  Free;
  end;
 end;
end;

something is wrong with this code: "if buf[intbuf] <> ' ' then CheckListBox1.Checked[StrToInt(buf[intbuf])] := True;" ?
i use delphi 4.
0
Comment
Question by:din345
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5 Comments
 
LVL 4

Accepted Solution

by:
LMuadDIb earned 30 total points
ID: 12029982
I usually use "0" or "1" to designate checked or not in checklists.
Here is the code.....

uses
   StrUtils;


procedure TForm1.FormDestroy(Sender: TObject);
var clbx: integer;
    buf: string;
begin
 with TRegistry.Create do begin
  RootKey := HKEY_CURRENT_USER;
  try
  if OpenKey('\Software\Test\', True) then begin
   for clbx := 0 to CheckListBox1.Items.Count - 1 do begin
    if CheckListBox1.Checked[clbx] = True then
      buf := buf + '1'
    else
      buf := buf + '0';
   end;
   WriteString('items', buf);
  end;
  finally
  CloseKey;
  Free;
  end;
 end;
end;

procedure TForm1.FormCreate(Sender: TObject);
var buf: string;
    intbuf: integer;
begin
 with TRegistry.Create do begin
  RootKey := HKEY_CURRENT_USER;
  try
  if OpenKey('\Software\Test\', false) then begin
    buf := ReadString('items');
    for intbuf := 0 to Length(buf) - 1 do begin
     if midstr(buf,intbuf+1,1) <> '1' then
      CheckListBox1.Checked[intbuf] := False
     else
      CheckListBox1.Checked[intbuf] := True;
    end;
  end;
  finally
  CloseKey;
  Free;
  end;
 end;
end;


hope this helps
Frank
0
 

Assisted Solution

by:meadorj
meadorj earned 20 total points
ID: 12030133
You can use the strtointdef function and set the default number to -1.  That should solve the convert error.  What string value does the registry return when you try to read it?
0
 
LVL 13

Expert Comment

by:BlackTigerX
ID: 12031308
try:

if buf[intbuf] <> ' ' then CheckListBox1.Checked[StrToIntDef(buf[intbuf], 0)] := True;
0
 
LVL 6

Assisted Solution

by:vadim_ti
vadim_ti earned 30 total points
ID: 12033312
buf is string, in your loop you need to use
    for intbuf := 1 to Length(buf)  do begin


    buf := ReadString('items');
    for intbuf := 0 to Length(buf) - 1 do begin
     if buf[intbuf] <> ' ' then CheckListBox1.Checked[StrToInt(buf[intbuf])] := True;
    end;


0
 
LVL 14

Expert Comment

by:DragonSlayer
ID: 12035264
vadim is right.
0

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