Delphi 自动检测U盘插入、拔出及获取U盘盘符!

u盘的 插入和删除windows会给所有的程序发出WM_DEVICECHANGE 信息
//这句放在private里面
procedure WMDeviceChange(var Msg: TMessage); message WM_DEVICECHANGE;

procedure TForm1.WMDeviceChange (var Msg: TMessage);
var
   myMsg : String;
begin
   Case Msg.WParam of
   32768:
     begin
       myMsg :=＇U盘插入＇;
       Label1.Caption:=myMsg
     end;
   32772:
     begin
       myMsg :=＇U盘拔出＇;
       Label1.Caption:=myMsg;
     end;
   end;
end;

u盘盘符判断

procedure TForm1.Button1Click(Sender: TObject);
var
buf:array [0..max_path-1] of char;
m_result:integer;
i:integer;
str_temp:string;
begin
m_result:=getlogicaldrivestrings(max_path,buf);
for i:=0 to (m_result div 4) do
    begin
      str_temp:=string(buf[i*4]+buf[i*4+1]+buf[i*4+2]);
      if getdrivetype(pchar(str_temp)) = drive_removable then
        begin
          showmessage(str_temp+＇盘为u盘＇) ;
          listbox1.items.add(str_temp) ;
        end;
end;


//完整源码
unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Label1: TLabel;
    Button1: TButton;
    ListBox1: TListBox;

    procedure Button1Click(Sender: TObject);

  private
    { Private declarations }
  //u盘的 插入和删除windows会给所有的程序发出WM_DEVICECHANGE 信息
  procedure WMDeviceChange(var Msg: TMessage);  message WM_DEVICECHANGE;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

// u盘的 插入和删除windows会给所有的程序发出WM_DEVICECHANGE 信息
procedure TForm1.WMDeviceChange (var Msg: TMessage);
var
   myMsg : String;
begin
   Case Msg.WParam of
   32768:
     begin
       myMsg :=＇U盘插入＇;
       Label1.Caption:=myMsg
     end;
   32772:
     begin
       myMsg :=＇U盘拔出＇;
       Label1.Caption:=myMsg;
     end;
   end;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
buf:array [0..max_path-1] of char;
m_result:integer;
i:integer;
str_temp:string;
begin
m_result:=getlogicaldrivestrings(max_path,buf);
for i:=0 to (m_result div 4) do
    begin
      str_temp:=string(buf[i*4]+buf[i*4+1]+buf[i*4+2]);
      if getdrivetype(pchar(str_temp)) = drive_removable then
        begin
          showmessage(str_temp+＇盘为u盘＇) ;
          listbox1.items.add(str_temp) ;
        end;
end;
end;

end.


end;