如何在 Inno Setup 中使用 PrepareToTinstall 函数的 NeedsRestart 参数？

Question

在 AllPagesExample.iss 示例文件中有这一部分：

function PrepareToInstall(var NeedsRestart: Boolean): String;
begin
  if SuppressibleMsgBox('Do you want to stop Setup at the Preparing To Install wizard page?', mbConfirmation, MB_YESNO, IDNO) = IDYES then
    Result := 'Stopped by user';
end;

如果PrepareToTinstall是一个事件函数，我自己又不调用它，我怎么给它传递NeedsRestart参数呢？

Answer 1

NeedsRestart参数是passed by a reference（var关键字）。因此它的值是从函数 return 中编辑的，类似于函数本身的 return 值 (Result)。

正如 documentation 所说：

Return a non empty string to instruct Setup to stop at the Preparing to Install wizard page, showing the returned string as the error message. Set NeedsRestart to True (and return a non empty string) if a restart is needed. If Setup is stopped this way, it will exit with a dedicated exit code as described in Setup Exit Codes.

因此，您要做的是为参数分配一个值，一旦事件函数退出，Inno Setup 就会相应地采取行动。

function PrepareToInstall(var NeedsRestart: Boolean): String;
begin
  Result := '';
  if DoWeNeedRestartBeforeInstalling then
  begin
    Result := 'You need to restart your machine before installing';
    NeedsRestart := True;
  end;
end;

如何在 Inno Setup 中使用 PrepareToTinstall 函数的 NeedsRestart 参数？

How to use NeedsRestart parameter of PrepareToTinstall function in Inno Setup?

inno-setup

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