根据窗口句柄获取所在程序路径

本例效果图:

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

uses PsAPI; {GetModuleFileNameEx 函数需要它}

{根据窗口句柄获取所在程序路径的函数}
function GetProcessExePath(h: HWND): string;
var
  pid: Cardinal;
  pHandle: THandle;
  buf: array[0..MAX_PATH] of Char;
begin
  {先获取进程 ID}
  GetWindowThreadProcessId(h, @pid);
  {再获取进程句柄}
  pHandle := OpenProcess(PROCESS_ALL_ACCESS, False, pid);
  {获取进程路径}
  GetModuleFileNameEx(pHandle, 0, buf, Length(buf));
  CloseHandle(pHandle);
  Result := buf;
end;

{测试当前程序}
procedure TForm1.Button1Click(Sender: TObject);
var
  path: string;
begin
  path := GetProcessExePath(Handle);
  ShowMessage(path);
end;

{测试记事本 - 需要随便打开一个记事本}
procedure TForm1.Button2Click(Sender: TObject);
var
  wh: HWND;
  path: string;
begin
  wh := FindWindow('Notepad', nil);
  path := GetProcessExePath(wh);
  ShowMessage(path);
end;

end.