SQL Server相关问题(SQL Server related question)

 脚本常量是一种方法。 只需要确保只提示用户一次并重复使用源和目标路径的结果。 
 
 例如，您可以使用CreateInputDirPage并实现脚本常量来引用用户在页面上指定的路径： 
 
[Run]
Filename: "robocopy.exe"; Parameters: "{code:CopyDir} {code:CopyDir}\OLD"
 
[Code]
var
  CopyDirPage: TInputDirWizardPage;

procedure InitializeWizard();
begin
  CopyDirPage :=
    CreateInputDirPage(wpSelectDir, 'Select source directory', '',  '', False, '');
  CopyDirPage.Add('Source directory:');
end;

function CopyDir(Params: string): string;
begin
  Result := CopyDirPage.Values[0];
end;

The scripted constant is a way to go. Just just need to make sure you prompt the user just once and reuse the results for both the source an the destination path.
 
You can for example use CreateInputDirPage and implement the scripted constant to refer to a path that a user specified on the page:
 
[Run]
Filename: "robocopy.exe"; Parameters: "{code:CopyDir} {code:CopyDir}\OLD"
 
[Code]
var
  CopyDirPage: TInputDirWizardPage;

procedure InitializeWizard();
begin
  CopyDirPage :=
    CreateInputDirPage(wpSelectDir, 'Select source directory', '',  '', False, '');
  CopyDirPage.Add('Source directory:');
end;

function CopyDir(Params: string): string;
begin
  Result := CopyDirPage.Values[0];
end;