FYI, the subject should be:
"Concating two strings using ArrayCopy and ArrayCopy2"
So to begin with I know about JoinStrings, I'm actually trying to avoid JoinStrings since it's generally not a good thing to use in a loop (although I found a work around for that...).
I am attempting to combine a hard coded string prefix to another string into a byte array. For example, I have a string stored in the variable "src". I want to build a byte array "filename" by combine the char/string constant "/code-" and the value in "src". Basically "/code-"+src="/code-comcastmenu".
The code where I try to do this is below:
The results are:
Filename after copied first string:/code-
Filename after appending second string:/code-
I never seem to get it to append the value of src into filename. In fact I tried writing my own copy routine like this:
I used the above routine after using bc.ArrayCopy("/code-",filename). However with the above I was always getting out of bound errors on trg array. It seemed to think the trg array was the size of "/code" (the array error always indicated out of bounds with length of 6 or something like that). I suspect an out of bounds error is happening in ArrayCopy2. Is the presence of the null terminated string messing up the appending?
"Concating two strings using ArrayCopy and ArrayCopy2"
So to begin with I know about JoinStrings, I'm actually trying to avoid JoinStrings since it's generally not a good thing to use in a loop (although I found a work around for that...).
I am attempting to combine a hard coded string prefix to another string into a byte array. For example, I have a string stored in the variable "src". I want to build a byte array "filename" by combine the char/string constant "/code-" and the value in "src". Basically "/code-"+src="/code-comcastmenu".
The code where I try to do this is below:
B4X:
Dim src As String = "comcastmenu"
Dim filename(255) As Byte
bc.ArrayCopy("/code-",filename)
Log("Filename after copied first string:",filename)
bc.ArrayCopy2(src.GetBytes,0,filename,6,src.Length)
Log("Filename after appending second string:",filename)The results are:
Filename after copied first string:/code-
Filename after appending second string:/code-
I never seem to get it to append the value of src into filename. In fact I tried writing my own copy routine like this:
B4X:
Sub CopyArray(src() As Byte, srclen As UInt, trg() As Byte, offset As UInt)
Dim i As UInt
Dim trg_idx As UInt
Log("srclen:",srclen)
Log("offset:",offset)
trg_idx = offset
For i = 0 To srclen - 1
Log("i=",i, " trg_idx=",trg_idx)
trg(trg_idx) = src(i)
trg_idx = trg_idx + 1
Next
End SubI used the above routine after using bc.ArrayCopy("/code-",filename). However with the above I was always getting out of bound errors on trg array. It seemed to think the trg array was the size of "/code" (the array error always indicated out of bounds with length of 6 or something like that). I suspect an out of bounds error is happening in ArrayCopy2. Is the presence of the null terminated string messing up the appending?
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