在更改环境值后，Innosetup SendMessage [英] Innosetup SendMessage after changing the environment values

问题描述

我使用InnoSetup在注册表中设置环境变量：

I set environment variable in the registry using InnoSetup:

[Registry]
Root: HKLM; Subkey: "SYSTEM\CurrentControlSet\Control\Session Manager\Environment"; ValueType: string; ValueName: "MY_PROGRAM_HOME_DIR"; ValueData: "{app}"

但是系统在调用 SendMessage 。

[Code]
procedure DeinitializeSetup();
begin
  // HWND_BROADCAST = $FFFF 
  // WM_SETTINGCHANGE = $001A
  SendMessage($FFFF, $001A, 0, Longint(PChar('Environment')));
end;

InnoSetup说：

InnoSetup says:

... Column 60：Type mismatch

... Column 60: Type mismatch

如何正确类型转换 PChar 到InnoSetup脚本中的 Longint 中？

How do I correctly typecast PChar into Longint in InnoSetup script?

推荐答案

ChangesEnvironment 指令而不是从你的脚本代码做同样的。从引用：

Use the ChangesEnvironment directive instead of doing the same from your script code. From the reference:

设置为yes时，在安装结束时安装程序将通知
其他正在运行的应用程序

When set to yes, at the end of the installation Setup will notify other running applications (notably Windows Explorer) that they should reload their environment variables from the registry.

在InnoSetup中，当您使用上述指令时，以下代码在里面调用：

In InnoSetup, when you use the above directive, the following code is called inside:

SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, 0,
  LPARAM(PChar('Environment')), SMTO_ABORTIFHUNG, 5000, MsgResult);

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