学步园

问题来源: http://www.cnblogs.com/del/archive/2008/07/30/1255869.html#1272342

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本例效果图:

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代码文件:

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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.

窗体文件:

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object Form1: TForm1
  Left = 0
  Top = 0
  Caption = 'Form1'
  ClientHeight = 116
  ClientWidth = 471
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'Tahoma'
  Font.Style = []
  OldCreateOrder = False
  Position = poDesktopCenter
  PixelsPerInch = 96
  TextHeight = 13
  object Button1: TButton
    Left = 112
    Top = 33
    Width = 233
    Height = 25
    Caption = 'Button1'
    TabOrder = 0
    OnClick = Button1Click
  end
  object Button2: TButton
    Left = 112
    Top = 64
    Width = 233
    Height = 25
    Caption = 'Button2'
    TabOrder = 1
    OnClick = Button2Click
  end
end