这段代码可以做到。但请注意,此代码不检查,如果标记的值被引号字符包围,一旦找到由TagName
参数指定的标记,它会切断该行的其余部分并附加参数给定的值TagValue
:
function ReplaceValue(const FileName, TagName, TagValue: string): Boolean;
var
I: Integer;
Tag: string;
Line: string;
TagPos: Integer;
FileLines: TStringList;
begin
Result := False;
FileLines := TStringList.Create;
try
Tag := '"' + TagName + '"';
FileLines.LoadFromFile(FileName);
for I := 0 to FileLines.Count - 1 do
begin
Line := FileLines[I];
TagPos := Pos(Tag, Line);
if TagPos > 0 then
begin
Result := True;
Delete(Line, TagPos + Length(Tag), MaxInt);
Line := Line + ' "' + TagValue + '"';
FileLines[I] := Line;
FileLines.SaveToFile(FileName);
Break;
end;
end;
finally
FileLines.Free;
end;
end;
procedure CurStepChanged(CurStep: TSetupStep);
var
NewPath: string;
begin
if CurStep = ssDone then
begin
NewPath := ExpandConstant('{app}') + '\apps\common\App70';
StringChangeEx(NewPath, '\', '\\', True);
if ReplaceValue(ExpandConstant('{app}\app70.txt'), 'appinstalldir',
NewPath)
then
MsgBox('Tag value has been replaced!', mbInformation, MB_OK)
else
MsgBox('Tag value has not been replaced!.', mbError, MB_OK);
end;
end;