Change All Dots to Comma in File

// ChangeAllDotsToCommaInFile(pathName, fileName)
// Changes all dot characters to commas in the specified file.
// You might want to do this to output a data file that represents numbers using the conventional European decimal separator.
// NOTE: This may not work for Asian text that contains double-byte characters.
Function ChangeAllDotsToCommaInFile(pathName, fileName)
    String pathName     // Name of an Igor symbolic path or ""
    String fileName         // Name of file or full path to file
 
    Variable refNum
 
    // Open source file and read the raw text from it into a string variable
    Open/Z=1/P=$pathName refNum as fileName
    if (V_flag != 0)
        return -1                       // pathName and fileName do not fully specify the file to be opened
    endif
 
    FStatus refNum                      // Sets V_logEOF
    Variable numBytesInFile = V_logEOF
    String text = PadString("", numBytesInFile, 0x20)
    FBinRead refNum, text               // Read entire file into variable.
    
    text = ReplaceString(".", text, ",")
    
    FSetPos refNum, 0                   // Write string back to file
    FBinWrite refNum, text
    
    Close refNum
 
    return 0
End