LIGOtools includes the C-language frame i/o library written by Benoit Mours et al., which forms the core of the Fr package. The web page for the Fr package contains a link to the documentation for the frame library, plus links to several example C programs which demonstrate calling sequences to read and write frame files. You can compile a C program and link it to the frame library using something like:
gcc myprog.c $LIGOTOOLS/lib/libFrame.a -lm -I$LIGOTOOLS/include -o myprog
(The -lm is needed on Solaris to link in the math library, since the frame library uses the sqrt() function.)

LIGOtools also includes two methods for creating frame files without having to write a C program.

The Fbe package

• ascii2frame creates frames containing several channels at different sampling rates, starting from several series of ASCII files. (Documentation)
• table2frame converts a single column-formatted file into frames with several channels all at the same sampling rate. (Documentation)

Here is a usage example, courtesy of Duncan Brown:

Here is what I use to build frames for the inspiral code:

ascii2frame -channel "H2:LSC-AS_Q" -type adc -sampling 16384 -compress 0 \
-frames_per_file 1 -seconds_per_frame 1 -detector LIGO_HANFORD_2K \
-GTimeS 600000000 -i cn_1.40_1.40_20.00.dat

where cn_1.40_1.40_20.00.dat is a single column ascii data file.

You can also type "ascii2frame -h" or "table2frame" to get detailed usage information for these two utilities.

The Matlab function mkframe

Here is an example of a Matlab session which creates a frame file called 'mydata.dat' containing one second of data (2048 samples) of a floating-point channel called 'H2:mychan':

>> dat.channel='H2:mychan';
>> dat.data = sin( 0.1 * (0:1:2047) );
>> dat.type='f';
>> dat.mode='a';
>> mkframe('mydata.dat',dat,'n',1)