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Formatting and I/O Library Chapter 2
LabWindows/CVI Standard Libraries 2-24 © National Instruments Corporation
carriage-return/linefeed combination will be treated as a linefeed. If fileHandle is zero, the line
will be read from the standard input.
lineBuffer is a character buffer. It should be large enough to contain maximum#Bytes bytes
plus an ASCII NUL.
ReadLine returns the number of bytes read from the file, including discarded bytes, but
excluding the linefeed. Hence, the return value will exceed maximum#Bytes if and only if bytes
are discarded.
If no bytes are read because the end of the file has been reached, ReadLine returns -2. If an
I/O error occurs, ReadLine returns -1.
Scan
int n = Scan (void *source, char *formatString, targetptr1,…,targetptrn);
Purpose
Scans a single source item in memory and breaks it into component parts according to format
specifiers found in a formatString. The components are then placed into the target parameters.
Parameters
Input
source Type must match formatString contents
formatString
string.
Output
targetptr1,…,targetptrn Types must match formatString contents.
Return Value
n
integer Number of target format
specifiers satisfied.
Return Code
-1
Format string error.
Using This Function
The return value indicates how many target format specifiers were satisfied, or -1 if the format
string is in error. A complete discussion of this function is in the Using the Formatting and
Scanning Functions section later in this chapter.