我正在尝试使用Delphi Rio(Firemonkey)从Windows注册表中保存/检索布尔值。无论我保存哪种状态,无论是真还是假,代码始终返回一个真值。这是一个示例项目,说明了我的方法:
uses
System.IniFiles, System.Win.Registry;
const
AppRegKey = 'Software\Mycroft\TestApp';
procedure TForm2.btnReadClick(Sender: TObject);
var
Reg: TCustomIniFile;
checked: boolean;
begin
Reg := TRegistryIniFile.Create('');
checked := False;
if Reg.SectionExists(AppRegKey + '\State\BoxChecked') then begin
checked := Reg.ReadBool(AppRegKey,'Show', True);
end;
if checked then
ShowMessage('Checked')
else
ShowMessage('Unchecked');
end;
procedure TForm2.btnSaveClick(Sender: TObject);
var
Reg: TCustomIniFile;
begin
Reg := TRegistryIniFile.Create('');
Reg.WriteBool(AppRegKey + '\State\BoxChecked', 'Show', chkBrandNew.IsChecked);
end;
似乎注册表中正在更新该值,所以我不确定为什么它总是返回True值。有人可以指出正确的方向吗?
您没有将与Reg.ReadBool()
相同的键名传递给Reg.WriteBool()
。
您还将泄漏TRegistryIniFile
对象。
尝试以下方法:
uses
System.IniFiles, System.Win.Registry;
const
AppRegKey = 'Software\Mycroft\TestApp';
AppRegKey_BoxChecked = AppRegKey + '\State\BoxChecked';
procedure TForm2.btnReadClick(Sender: TObject);
var
Reg: TCustomIniFile;
checked: boolean;
begin
Reg := TRegistryIniFile.Create('');
try
checked := False;
if Reg.SectionExists(AppRegKey_BoxChecked) then
begin
checked := Reg.ReadBool(AppRegKey_BoxChecked, 'Show', True);
end;
if checked then
ShowMessage('Checked')
else
ShowMessage('Unchecked');
finally
Reg.Free;
end;
end;
procedure TForm2.btnSaveClick(Sender: TObject);
var
Reg: TCustomIniFile;
begin
Reg := TRegistryIniFile.Create('');
try
Reg.WriteBool(AppRegKey_BoxChecked, 'Show', chkBrandNew.IsChecked);
finally
Reg.Free;
end;
end;
也就是说,TRegistryIniFile
旨在与旧代码向后兼容,该旧代码用于使用TIniFile
保存配置,然后迁移到注册表。新代码完全不应使用TRegistryIniFile
。
uses
System.Win.Registry;
const
AppRegKey = 'Software\Mycroft\TestApp';
AppRegKey_BoxChecked = AppRegKey + '\State\BoxChecked';
procedure TForm2.btnReadClick(Sender: TObject);
var
Reg: TRegistry;
checked: boolean;
begin
Reg := TRegistry.Create;
//Reg := TRegistry.Create(KEY_QUERY_VALUE);
try
checked := False;
if Reg.OpenKeyReadOnly(AppRegKey_BoxChecked) then
// if Reg.OpenKey(AppRegKey_BoxChecked, False) then
begin
if Reg.ValueExists('Show') then
checked := Reg.ReadBool('Show')
else
checked := True;
Reg.CloseKey;
end;
if checked then
ShowMessage('Checked')
else
ShowMessage('Unchecked');
finally
Reg.Free;
end;
end;
procedure TForm2.btnSaveClick(Sender: TObject);
var
Reg: TRegistry;
begin
Reg := TRegistry.Create(KEY_SET_VALUE);
try
if Reg.OpenKey(AppRegKey_BoxChecked, True) then
begin
Reg.WriteBool('Show', chkBrandNew.IsChecked);
Reg.CloseKey;
end;
finally
Reg.Free;
end;
end;