Hello all,
First of all, sorry for multiple question per one thread. I have two
questions. First what I think might be the easier problem. I am
capturing data from an embedded device which I need to display data.
One particular piece of data is a 32 bit floating point value. The
problem I am having is converting the 4-byte value which is read via
an RS-232 link. How can I cast the 4-byte value to a value type float
correctly? I have tried placing shifting the bytes into either a int
or UInt32 (which is a class from what I understand) then casting that
value as a float, but it doesn't work correctly. This operation looks
similar to
int value = (int)((byteCode[0] << 24 ) |
(byteCode[1] << 16 ) |
(byteCode[2] << 8 ) |
(byteCode[3] ));
float valueF = (float)value;
This obviosuly doesn't appear to work correctly. The embedded device
stores the 32-bit float in the standard IEEE format from my current
understanding which should be compatable with the MS compiler. So how
would I get this conversion to work correctly?
The second question I have deals with using Generics. I have an
interface which looks like
interface IScriptVar<Twhere T : struct
{
string ToString();
string ToHexString( );
void SetValue( T value, UInt32 index );
void SetValue( T[] values, int index );
T GetValue( int index );
....
}
public class CScriptVar<T: IScriptVar<Twhere T : struct
{
... Implemented Interface methods and members
}
which I have also created a List for them
public class CScriptVarStringList<CScriptVarString:
IList<CScriptVarString>
{
....
}
Then in my code I have the following
private CScriptVarList<CScriptVar<byte> ScriptVarsBytes;
private CScriptVarList<CScriptVar<short> ScriptVarsShort;
private CScriptVarList<CScriptVar<int> ScriptVarsInts;
private CScriptVarList<CScriptVar<float> ScriptVarsFloat;
I have a method when passed in certain arguments it will return on the
of the objects. Since they all implement several interfaces I would
like to return the object and then cast it to the generic/general type
of IScriptVar<T>, but this does not work correctly. I have something
like the following currently, but I don't think it is right since I am
forced to qualify using a (struct or data types) byte, short, int or
float.
((IScriptVar<int>)scriptVar).ToHexString();
or
((CScriptVar<int>)scriptVar).ToHexString();
I was hoping to use a generic form, but perhaps this is not possible.
When I retrieve the object I could perform a typeof conditional then
switch between each one of the System.Type (struct or data types)
which would look like
if ( scriptVar.GetType() == typeof(IScriptVar<byte>))
{ ((CScriptVar<byte>)scriptVar).ToHexString(); }
if ( scriptVar.GetType() == typeof(IScriptVar<short>))
{ ((CScriptVar<short>)scriptVar).ToHexString(); }
if ( scriptVar.GetType() == typeof(IScriptVar<int>))
{ ((CScriptVar<int>)scriptVar).ToHexString(); }
if ( scriptVar.GetType() == typeof(IScriptVar<float>))
{ ((CScriptVar<float>)scriptVar).ToHexString(); }
Does anyone know of a elegant way of handling this or perhaps a better
approach.
Mark
