首先,您需要一个在后台运行的程序,并监听并响应击键.像这样：

program Project1;

uses
  Windows,Messages,ShellAPI;

var
  W: HWND;
  M: MSG;

const
  WM_SETHOTKEY = WM_APP + 1;
  WM_UNSETHOTKEY = WM_APP + 2;
  AppName = 'Rejbrand Hot Key Listener';

const
  FileNames: array[0..1] of string = ('notepad.exe','pbrush.exe');

begin

  if FindWindow('STATIC',PChar(AppName)) <> 0 then
    Exit;


  W := CreateWindow('STATIC',PChar(AppName),100,HWND_MESSAGE,HInstance,nil);

  while GetMessage(M,W,0) do
    case M.message of
      WM_HOTKEY:
        ShellExecute(0,nil,PChar(FileNames[M.wParam]),SW_SHOWNORMAL);
      WM_SETHOTKEY:
        RegisterHotKey(W,M.wParam,M.lParam shr 16,M.lParam and $FFFF);
      WM_UNSETHOTKEY:
        UnregisterHotKey(W,M.wParam);
    end;

end.

(要创建此程序,请选择New / VCL Forms Application,然后从项目中删除主窗体.然后选择Project / View Source并删除Application.Initialize废话.程序应如上所示.)

上面的程序监听注册新Windows热键的消息WM_SETHOTKEY,删除以前注册的热键的WM_UNSETHOTKEY,以及最终用户激活注册的热键时由Windows发送的WM_HOTKEY.前两条消息由我在此应用程序中定义.

要注册热键,请将消息WM_SETHOTKEY发送到窗口W.消息的wParam应该是要启动的程序的索引(在FileNames数组中). lParam的格式应为$MMMMKKK,其中$MMMM是修饰符(Ctrl,Alt,Shift),$KKKK是热键的虚拟键代码.要删除热键,请将带有程序索引的WM_UNSETHOTKEY消息作为wParam发送到W.

样品用法

从任何应用程序,您都可以(假设Project1.exe在后台运行)

const
  WM_SETHOTKEY = WM_APP + 1;
  WM_UNSETHOTKEY = WM_APP + 2;

const
  MODIFIER_ALT = MOD_ALT shl 16;
  MODIFIER_CTRL = MOD_CONTROL shl 16;
  MODIFIER_SHIFT = MOD_SHIFT shl 16;

procedure TForm1.RegisterHotkeys;
var
  w: HWND;
begin
  w := FindWindow('STATIC','Rejbrand Hot Key Listener');
  PostMessage(w,WM_UNSETHOTKEY,MODIFIER_CTRL + MODIFIER_ALT + ord('N'));
  PostMessage(w,WM_SETHOTKEY,1,MODIFIER_CTRL + MODIFIER_ALT + ord('P'));
end;

现在,即使您关闭此新程序,notepad.exe和pbrush.exe也将分别在Ctrl Alt N和Ctrl Alt P上启动.

还有一些讨论

注意,编译时,Project1.exe只有20 kB小！对于Delphi中的应用程序来说这很小！

要取消注册以前注册的热键,请执行

PostMessage(w,N,0);

其中N,在这个例子中,对于记事本是= 0而对于pbrush是= 1.

要退出project1.exe,WM_QUIT,0);

但是,当然,如果退出project1.exe,Windows将取消注册所有热键.

你可能想做

procedure TForm1.RegisterHotkeys;
var
  w: HWND;
begin
  w := FindWindow('STATIC','Rejbrand Hot Key Listener');
  if w = 0 then
    MessageBox('Error: Rejbrand Hot Key Listener not running!');
  PostMessage(w,MODIFIER_CTRL + MODIFIER_ALT + ord('P'));
end;

如果找不到窗口,甚至可以启动project1.exe.