Delphi窗体置顶及失去焦点后取得焦点

unit u_FrmTopMostActive;

interface

uses Winapi.Windows;

implementation

// 窗体置顶
procedure SetXwForegroundWindow(AHandle: Thandle);
var
  hFgWin: Thandle;
  hFgThread: Thandle;
begin

  ShowWindow(AHandle, SW_NORMAL);

  hFgWin := GetForegroundWindow;
  hFgThread := GetWindowThreadProcessID(hFgWin, nil);

  if AttachThreadInput(GetCurrentThreadID, hFgThread, true) then
  begin
    SetForegroundWindow(AHandle);
    AttachThreadInput(GetCurrentThreadID, hFgThread, false);
  end
  else
    SetForegroundWindow(AHandle);

end;

// 激活窗体
function SetSysFocus(AHandle: Thandle): boolean;
var
  hThreadId: Thandle;
  hFgThreadId: Thandle;
begin
  result := false;
  if not IsWindow(AHandle) then
    exit;
  hThreadId := GetWindowThreadProcessID(AHandle, nil);
  hFgThreadId := GetWindowThreadProcessID(GetForegroundWindow, nil);
  if AttachThreadInput(hThreadId, hFgThreadId, true) then
  begin
    SetFocus(AHandle);
    AttachThreadInput(hThreadId, hFgThreadId, false);
  end
  else
    SetFocus(AHandle);
  result := true;
end;

end.

使用方式

uses U_FrmTopmostActive;

//自己需要的处理完后调用，句柄测试为本窗体的句柄

SetXwForegroundWindow(Self.Handle);
    SetSysFocus(Self.Handle);

感谢 晓不得2013老师 提供的代码并耐心指导（群：59129236）