Determine Size of Typed variables

[Steven Sparrow]

Hi Erel,

We use a lot of structures in our applications, as we communicate with remote Bluetooth and WiFi devices; marshalling structures etc.

Would it be possible to provide a method that allows us to retrieve the size of a Typed variable (in bytes). This would be especially useful in the case of "Typed" variables that which contain dozens of fields and other Typed variables. We don't want to hard-code the size if possible as it makes the code more difficult to mainain.

As an example:

Type RSP_GET_STATS_T (Command, Dummy As Byte, Result As Short, LastError As Short, Bearing, AddrLie, AddrPress, CorrTwist As Float, _
AddrMatrix As S16Matrix3X3T, SwingArc As Float, ImpType As Short, ImpFaceAngle, ImpPathAngle, ImpShaftAngle, ImpLieAngle, AttackAngle As Float, _
SOSRec, TOSRec, ImpRec As Short, MaxMph, ImpMph As Float, BackMs, DownMs, Checksum As Short)

Dim Stats As RSP_GET_STATS_T;
Dim length as int : Length = Stats.Size

Someone may have asked this before, but I tried searcfing the forums for sizeof, .length and .size related questions and drew a blank.

Thanks in advance,
Steve

 

[Erel]

Your type is not declared correctly. You should set the type of each field.

There is no SizeOf keyword in Basic4android (and in Java). You will need to calculate it yourself.

 

[Steven Sparrow]

Erel,

Thanks for the clarification.

As there are no "structs" in B4A, I was hoping there might be a way to iterate through the Typed variable elements and accumulate the sum of each elemt's size (e.g. short = 2, long=4 etc); not to worry.

Also, I found no issue with the format of my Type structure; it seems you do not have to specify a Type for each element and can group similar objects with a single declaratioon. We have been using it extensively without error.. unless we've overlooked something ?

Keep up the great work.. !

Regards,
Steve

 

[Erel]

unless we've overlooked something ?

The fields without types are implicitly declared as strings. The compiler converts them to numbers as needed.