CVI offers you inifile instrument to read / write .INI files: you must load the instrument into Instrument menu if you haven't done it already. If you don't know this instrument you can find it in <cvidir>\toolslib\toolbox directory. I suggest you to read the online help and see the related example that comes with CVI.
Supposing you are reding the line with Ini_GetStringIntoBuffer () you can scan the line read to obtain desired text.
Scanning the line is quite easy if you rely on separators: you can either use strtok () or Scan () function to easily extracd desired value from the line.
