inno-setup - Inno Setup - 如何在安装之前/期间检查系统规范？

Question

特别是，我想检查 PC 上安装的 RAM 量。如果它小于 1GB，我想在安装之前/期间显示一条警告消息......

Answer 1

我会亲自在安装开始时进行此检查，以免让用户通过安装向导感到失望。为此，我将在向导实际显示为它在以下脚本中使用之前显示警告。当内存低于机器上检测到的 1073,741.824 B (1GB) 物理内存时，它应该警告用户。如果用户不同意警告，则设置终止；如果实际物理内存超过上述数量或用户接受警告，则设置过程将继续:

[Code]
type
  { the following mapping of the DWORDLONG data type is wrong; }
  { the correct type is a 64-bit unsigned integer which is not }
  { available in InnoSetup Pascal Script at this time, so max. }
  { values of the following fields will be limited to quite a }
  { big reserve of 8589,934.592 GB of RAM; I hope enough for }
  { the next versions of Windows :-) }
  DWORDLONG = Int64;
  TMemoryStatusEx = record
    dwLength: DWORD;
    dwMemoryLoad: DWORD;
    ullTotalPhys: DWORDLONG;
    ullAvailPhys: DWORDLONG;
    ullTotalPageFile: DWORDLONG;
    ullAvailPageFile: DWORDLONG;
    ullTotalVirtual: DWORDLONG;
    ullAvailVirtual: DWORDLONG;
    ullAvailExtendedVirtual: DWORDLONG;
  end;

function GlobalMemoryStatusEx(var lpBuffer: TMemoryStatusEx): BOOL;
  external 'GlobalMemoryStatusEx@kernel32.dll stdcall';

function InitializeSetup: Boolean;
var
  MemoryStatus: TMemoryStatusEx;
begin
  { allow the installation (even if the GlobalMemoryStatusEx call fails) }
  Result := True;
  { that's the requirement of the function call; you must set the size }
  { of the passed structure in bytes }
  MemoryStatus.dwLength := SizeOf(MemoryStatus);
  { if the GlobalMemoryStatusEx function call succeed, then... }
  if GlobalMemoryStatusEx(MemoryStatus) then
  begin
    MsgBox(Int64ToStr(MemoryStatus.ullTotalPhys), mbInformation, MB_OK);

    { if the amount of actual physical memory in bytes is less than }
    { 1073,741.824 B (1 GB), then show a warning message and according }
    { to user's decision abort the installation }
    if MemoryStatus.ullTotalPhys < 1073741824 then
    begin
      if MsgBox('You have less than 1GB of physical memory available. ' +
        'Are you sure you want to continue with the installation ?', 
        mbConfirmation, MB_YESNO) = IDNO
      then
        Result := False;
    end;
  end;
end;