如何在TInputQueryWizardPage编辑框中只允许输入字母数字字符？

Question

我需要在Inno Setup的TInputQueryWizardPage编辑框中仅允许输入字母数字字符。我怎么能这样做？

Answer 1

要识别字母数字字符，我会使用IsCharAlphaNumeric Windows API函数，并且在指定的输入编辑的OnKeyPress事件中，如果它不是字母数字，我会吃掉密钥：

[Setup]
AppName=My Program
AppVersion=1.5
DefaultDirName={pf}\My Program

[Code]
#ifdef UNICODE
  #define AW "W"
#else
  #define AW "A"
#endif

function IsCharAlphaNumeric(ch: Char): BOOL;
  external 'IsCharAlphaNumeric{#AW}@user32.dll stdcall';

procedure InputQueryEditKeyPress(Sender: TObject; var Key: Char);
begin
  // if the currently pressed key is not alphanumeric, eat it by
  // assigning #0 value
  if not IsCharAlphaNumeric(Key) then
    Key := #0;
end;

procedure InitializeWizard;
var
  EditIndex: Integer;
  InputPage: TInputQueryWizardPage;
begin
  // create input query page and add one edit item
  InputPage := CreateInputQueryPage(wpWelcome, 'Caption', 'Description',
    'SubCaption');
  EditIndex := InputPage.Add('Name:', False);
  // assign the OnKeyPress event method to our custom one
  InputPage.Edits[EditIndex].OnKeyPress := @InputQueryEditKeyPress;
end;