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There is a Left and Right method in Silktest but no Mid function. How can I get round this?

There is a Left and Right method in Silktest but no Mid function. How can I get round this?

 
The following function combines the use of the Left and Right methods to create a Mid function that returns X letters from a string starting at Y position. The prototype is
string sDataOut=Mid(string sDataIn, integer iStartPos, integer iEndPos, string sDataOut)


The function is

[-] string Mid(string sDataIn, integer iStart, integer iEnd, string sDataOut)
    [ ] integer i=0
    [ ] string sData=""
    [ ] 
    [ ] //Check that iStart and iEnd are NOT out of range compared to sData
    [-] if((iStart>len(sDataIn)) || (iEnd>len(sDataIn)-(iStart-1)))
        [ ] sDataOut="NULL"
    [-] else
        [ ] sData=Right(sDataIn,len(sDataIn)-(iStart-1))
        [ ] sData=Left(sData,iEnd)
        [ ] sDataOut=sData
    [ ] return sDataOut

The following testcase will act as proof of function:

[-] testcase GetMidString() appstate none

    [ ] string sData="Borland Software"
    [ ] sMidString=""

    [ ] sMidString=Mid(sData,4,4,sMidString)
    [ ] print(sMidString)

sMidString will return "land".

Old KB# 20730

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