Hello,
I have to create a very long string by concatenating many (thousands) smaller ones.
Now I use two methods:
1. (The not recommended one):
2. By converting strings into Byte Arrays and performing an ArrayCopy:
and using it like this:
I call the concatenation operation once for each of the thousands small strings.
The performance of method 2 is slightly better than method 1 (in my real case from 1m:30s to 1m:10s).
I have to mention that I have to use a string variable without sending it (by using AStream.Write as it was recommended in the other related questions).
Are there other methods to optimize the speed of this concatenation operation ?
Than you.
I have to create a very long string by concatenating many (thousands) smaller ones.
Now I use two methods:
1. (The not recommended one):
B4X:
LongString = LongString & SmallString2. By converting strings into Byte Arrays and performing an ArrayCopy:
B4X:
Sub StringsConcat(Str1 As String, Str2 As String) As String
Dim StrLen As Int = Str1.Length + Str2.Length
Dim StrAsBytesArray(StrLen) As Byte
ByteConv.ArrayCopy(Str1.GetBytes("UTF8"), 0, StrAsBytesArray, 0, Str1.Length)
ByteConv.ArrayCopy(Str2.GetBytes("UTF8"), 0, StrAsBytesArray, Str1.Length, Str2.Length)
Return (ByteConv.StringFromBytes(StrAsBytesArray, "UTF8"))
End Suband using it like this:
B4X:
LongString = StringsConcat (LongString, SmallString)I call the concatenation operation once for each of the thousands small strings.
The performance of method 2 is slightly better than method 1 (in my real case from 1m:30s to 1m:10s).
I have to mention that I have to use a string variable without sending it (by using AStream.Write as it was recommended in the other related questions).
Are there other methods to optimize the speed of this concatenation operation ?
Than you.