1.检查是否是U盘

2.查检U盘的卷标

3.通过VolumeLable的返回值对比判断是否你加密的U盘(卷标要定义好)



function CheckUsbDisk(FLable:string):Boolean; //检验是否是USB优盘
var
Drive: Integer;
DriveLetter: Char;
begin
Result :=false;
for Drive := 2 to 25 do
begin
DriveLetter := Chr(Drive + ord('A'));
if GetDrivetype(PChar(DriveLetter+':\'))= DRIVE_REMOVABLE then
begin
if VolumeID(DriveLetter)=FLable then
begin
Result :=true;
exit;
end;
end;
end;
end;

function VolumeLable(DriveChar: Char): string; //检验USB优盘的卷标
var
OldErrorMode: Integer;
NotUsed, VolFlags: DWORD;
Buf: array [0..MAX_PATH] of Char;
begin
OldErrorMode := SetErrorMode(SEM_FAILCRITICALERRORS);
try
Buf[0] := #$00;
if GetVolumeInformation(PChar(DriveChar + ':\'), Buf, DWORD(sizeof(Buf)),
nil, NotUsed, VolFlags, nil, 0) then
SetString(Result, Buf, StrLen(Buf))
else Result := '';
if DriveChar < 'a' then
Result := AnsiUpperCaseFileName(Result)
else
Result := AnsiLowerCaseFileName(Result);
Result := Format('%s',[Result]);
finally
SetErrorMode(OldErrorMode);
end;
end;