B4R Question [SOLVED]Function Chr(AscII Code) simplification?

[rwblinn]

In B4R could not find a builtin function for Chr to convert an AscII DEC code to a Char literal (i.e. Chr(76) = 'L').

Workout a solution using Inline C combined with a Sub, but wondering if there is a simpler way for the Chr function. Any suggestions?

Sub Process_Globals
    Public Serial1 As Serial
    Private asciiChar As String
End Sub

Private Sub AppStart
    Serial1.Initialize(115200)
    Chr(76) 'L
    Chr(77) 'M
End Sub

' Convert ascii dec 48 (0) to 90 (Z)
' Runs inline c to update global var asciiChar
Private Sub Chr(asciiCode As Int)
    RunNative("convertAscII", asciiCode)
    Log(asciiCode, "=", asciiChar)
End Sub

#if c
// Convert ascii dec to b4r string using Arduino C/C++ function: char(x) - Converts a value to the char data type
// Requires global var asciichar as string
void convertAscII(B4R::Object* o) {
    String buffer = String(char(o->toULong()));
    B4R::PrintToMemory pm;
    B4R::B4RString* s = B4R::B4RString::PrintableToString(NULL);
    pm.print(buffer);
    B4R::StackMemory::buffer[B4R::StackMemory::cp++] = 0;
    b4r_main::_asciichar = s;
}
#End If

 

[Erel]

It can be simplified. Here:

Dim b() = Array As Byte(76)
Log(b)

Strings and Bytes

 

[rwblinn]

Many Thanks and advice in the next post by not using a sub

Removed the Sub as replaced by next post solution.

'DO NOT USE
' Convert AscII DEC code to AscII String
' Example: <copy>
' Chr(76) returns "L"
' </copy>
Public Sub Chr(asciiCode As Int) As String
    Dim bc As ByteConverter
    Dim b() As Byte = Array As Byte(asciiCode)
    Return bc.StringFromBytes(b)
End Sub

 

[Erel]

I don't recommend using this sub too often...

Returning strings from subs can cause the stack buffer to be overflowed quite quickly.

1. Make 'bc' a global variable.
2. Prefer byte() over string.
3. If you must have a string for some reason then make it inline:

Dim s As String = bc.StringFromBytes(Array As Byte(76))

 

[rwblinn]

OK = Clear - adjusted post #3. Thanks again.

 

[VigilanteDesign]

I don't recommend using this sub too often...

Returning strings from subs can cause the stack buffer to be overflowed quite quickly.

1. Make 'bc' a global variable.
2. Prefer byte() over string.
3. If you must have a string for some reason then make it inline:

Dim s As String = bc.StringFromBytes(Array As Byte(76))

Hi there, is this "stack buffer to be overflowed" meant only for B4R development? Thanks

 

[Tim Chapman]

Hi there, is this "stack buffer to be overflowed" meant only for B4R development? Thanks

Yes.