delphi拖放文件到程序事件处理

1.添加引用ShellAPI。
2.运行程序时初始化 接受外部拖放。
3.接收事件
代码如下:

unit mainForm;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ComCtrls,StrUtils, WinSkinData, SkinCaption,ShellAPI;//添加ShellAPI引用 

type
  TForm1 = class(TForm)
    Button1: TButton;
    OpenDialog1: TOpenDialog;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
    procedure DropFiles(var Msg: TMessage); message WM_DROPFILES;

  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

{ TForm1 }
//显示文件路径
procedure TForm1.Button1Click(Sender: TObject);
begin
  if OpenDialog1.Execute then
  begin
    ShowMessage('当前文件路径为：'+OpenDialog1.FileName);
  end;
end;
//功能同上,显示文件路径
procedure TForm1.DropFiles(var Msg: TMessage);
var
 buffer: array[0..1024] of Char;
begin
  inherited;
  buffer[0] := #0;
  DragQueryFile(Msg.WParam, 0, buffer, sizeof(buffer)); //第一个文件
  ShowMessage('当前文件路径为：'+buffer);
end;
//初始化，接受外部拖放
procedure TForm1.FormCreate(Sender: TObject);
begin
   DragAcceptFiles(Handle,True);//第二个参数为False时，不启用文件拖放
end;

end.