网上搜了下都是通过调用API函数来实现，但是PB调用GetLogicalDrives时获取不到想要的值。
GetLogicalDrives
getdrivetype
下边是Delphi处理代码
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;
参考自：http://qqhack8.blog.163.com/blog/static/1141479852012102133475/
