Hi...
The :5 represents bit0 to bit 4 (5 bits) of a BYTE
-> this it is a value represented by 5 bits
The :1 then represents the 6the bit of the byte
So then the last 2 bits of the byte are unused
Regards
Ray
-----Original Message-----
From: [email protected] [mailto:[email protected]]
On Behalf Of James Brown
Sent: Wednesday, 2 September 2009 11:27 a.m.
To: Delphi-Talk Discussion List
Subject: Re: Variant Records
I'm even noobier but I think that the :5, :1 are presetting the structure,
like defaults.
--------------------------------------------------
From: "John Clements" <[email protected]>
Sent: Tuesday, September 01, 2009 2:41 PM
To: "Delphi-Talk Discussion List" <[email protected]>
Subject: RE: Variant Records
> I am a C noob so am unsure what the :5, :1 are, but assuming they are
> arrays the structure would look something like this I imagine:
>
> USBDeviceRequest = packed record
> bmRequestType : Byte;
> case Bits : Byte of
> 0 : (Recipient : array [1..5] of Byte);
> 1 : (DataDirection : array [1..1] of Byte); end; {
> USBDeviceRequest }
>
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of James Brown
> Sent: Tuesday, September 01, 2009 3:46 PM
> To: [email protected]
> Subject: Variant Records
>
> I cannot figure out what the equivalent Delphi for this C struct would
> be:
> typedef struct _USB_DEVICE_REQUEST
> {
> union
> {
> BYTE bmRequestType;
> struct
> {
> BYTE Recipient:5;
> BYTE DataDirection:1;
> }
> Bits;
> };
>
> I know it's a type of free union variant but what the heck is it.
>
> Thanks........ Jim
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