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9.3

Fix the answer to "Is a drive a USB drive?"

Asked by WinRat in Delphi Programming

Tags: Delphi 5, USB

Hi Experts,

MiDaTi posed the question: Is a drive a USB drive?
(refer http://www.experts-exchange.com/Programming/Languages/Pascal/Delphi/Q_23994641.html)

He posted his own solution (source code included) with no text as to which Delphi version it was intended for, required Delphi and additional 3rd-Party units and missing type definitions (e.g. BusTypeUsb).

It's exactly what I am looking for but I doesn't compile in Delphi 5 which I use. I created a unit, added Windows and SysUtils but no joy. I can see it requires a 3rd-party unit for "Tnt_CreateFileW". There are some Windows type definitions missing but I am not familiar with C syntax and conventions. D5 also doesn't have the WideFormat function.

Can anyone fix it so it complies without using 3rd-party units in Delphi 5? If that's not possible then some other way?
I think the answer will be helpful to other users too.
Thanks!

Get your answer NOW

         
           
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             {Posted self-solution by MiDaTi}
 
{ Returns TRUE if a drive is connected via USB or firewire, or is removable }
function NotInternalDrive(const aPath: WideString): Boolean;
 
const
  IOCTL_STORAGE_QUERY_PROPERTY = $2D1400;
 
type
  STORAGE_PROPERTY_QUERY = packed record
    PropertyId: DWORD;
    QueryType: DWORD;
    AdditionalParameters: array[0..3] of Byte;
  end;
 
  STORAGE_DEVICE_DESCRIPTOR = packed record
    Version: ULONG;
    Size: ULONG;
    DeviceType: Byte;
    DeviceTypeModifier: Byte;
    RemovableMedia: Boolean;
    CommandQueueing: Boolean;
    VendorIdOffset: ULONG;
    ProductIdOffset: ULONG;
    ProductRevisionOffset: ULONG;
    SerialNumberOffset: ULONG;
    STORAGE_BUS_TYPE: DWORD;
    RawPropertiesLength: ULONG;
    RawDeviceProperties: array[0..511] of Byte;
  end;
 
var
  Returned: Cardinal;
  Status: LongBool;
  PropQuery: STORAGE_PROPERTY_QUERY;
  DeviceDescriptor: STORAGE_DEVICE_DESCRIPTOR;
  FFileHandle: Cardinal;
  DriveStr: WideString;
begin
  Result:=FALSE;
  FFileHandle:=INVALID_HANDLE_VALUE;
  try
    // Open the drive
    DriveStr:=WideFormat('\\.\%s:', [AnsiString(aPath[1])]);
    FFileHandle:=Tnt_CreateFileW(PWideChar(DriveStr), 0, FILE_SHARE_READ or FILE_SHARE_WRITE, nil, OPEN_EXISTING, 0, 0);
    if (FFileHandle = INVALID_HANDLE_VALUE) then Exit;
 
    // Get the drive information
    ZeroMemory(@PropQuery, SizeOf(PropQuery));
    ZeroMemory(@DeviceDescriptor, SizeOf(DeviceDescriptor));
    DeviceDescriptor.Size:=SizeOf(DeviceDescriptor);
    Status:=DeviceIoControl(FFileHandle, IOCTL_STORAGE_QUERY_PROPERTY,
      @PropQuery, SizeOf(PropQuery), @DeviceDescriptor, DeviceDescriptor.Size,
      Returned, nil);
    if not Status then Exit;
 
    // Connected via USB or firewire? Removable media?
    Result:=(DeviceDescriptor.STORAGE_BUS_TYPE in [BusTypeUsb, BusType1394]) or DeviceDescriptor.RemovableMedia;
  finally
    if (FFileHandle <> INVALID_HANDLE_VALUE) then CloseHandle(FFileHandle);
  end;
end;

           
         

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Fix the answer to "Is a drive a USB drive?"

Asked by WinRat in Delphi Programming

Tags: Delphi 5, USB

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