获取当前文件所在路径

 1 unit Unit1;
 2 interface
 3 uses
 4   Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 5   Dialogs, StdCtrls;
 6 type
 7   TForm1 = class(TForm)
 8     Button1: TButton;
 9     Button2: TButton;
10     procedure Button1Click(Sender: TObject);
11     procedure Button2Click(Sender: TObject);
12   private
13     { Private declarations }
14   public
15     { Public declarations }
16   end;
17 var
18   Form1: TForm1;
19 implementation
20 
21 {$R *.dfm}
22  function hq(ShowResult: Boolean): String;
23 //这是一个函数，返回应用程序文件所在目录
24 begin
25   Result := ParamStr(0);
26   Result := ExtractFilePath(Result);
27   if ShowResult then
28     ShowMessage('应用程序路径是：' + Result);
29 end;
30 procedure ShowInfo(Info: String);
31 //这是一个过程，显示信息Info
32 begin
33   ShowMessage('应用程序路径是：' + Info);
34 end;
35 procedure TForm1.Button1Click(Sender: TObject);
36 // Button1Click和下面的Button2Click都是方法，属于类TForm1
37 var
38   S: String;
39 begin
40   S := hq(False);    //调用函数GetApplicationPath
41   ShowInfo(S);    //调用过程ShowInfo
42 end;
43 procedure TForm1.Button2Click(Sender: TObject);
44 // 方法Button2Click和和方法Button1Click实现的功能是完全一样的
45 begin
46   hq(True);
47 end;
48 end.