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<p align="center"><font size="6" color="#0000ff">.cal calendar file format</font></p>
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<br>
this topic describes the binary file format used by microsoft windows calendar
(calendar.exe). a calendar binary file <br>
contains information about file content, dates, days, and appointments. <br>
<br>
calendar-file header<br>
<br>
the first 8 bytes of a calendar file are a character array identifying the file as a
calendar file. following are the contents of the <br>
array: <br>
<br>
<br>
<br>
'c' + 'r' = b5<br>
'a' + 'a' = a2<br>
'l' + 'd' = b0<br>
'e' + 'n' = b3<br>
'n' + 'e' = b3<br>
'd' + 'l' = b0<br>
'a' + 'a' = a2<br>
'r' + 'c' = b5<br>
<br>
the next 2 bytes (cdatedescriptors) contain the integer count of dates described in the
file. <br>
the next 12 bytes contain six 2-byte fields of information that is global to the entire
file. these variables are normally set by the <br>
user through the alarm controls and options day dialog boxes. the header information has
the following form: <br>
<br>
<br>
<br>
word minearlyring<br>
bool fsound<br>
int interval<br>
int mininterval<br>
bool f24hourformat<br>
int starttime<br>
<br>
following are the members in the header structure: <br>
<br>
minearlyring specifies an early ring, in minutes. <br>
fsound specifies whether alarms should be audible. <br>
interval specifies the interval between appointments: 0 = 15 minutes, 1
= 30 minutes, 2 = 60 minutes. <br>
mininterval specifies the interval, in minutes. <br>
f24hourformat specifies the time format: nonzero=24-hour format. <br>
starttime specifies the starting time in day mode--that is, the time
that normally appears first in the display, in minutes <br>
past midnight. <br>
<br>
the rest of the first 64 bytes are reserved. <br>
<br>
date descriptors<br>
<br>
a date-descriptor array appears next. each entry in the array describes one day. the
number of entries in the array is <br>
cdatedescriptors (described in the preceding section). each element in the array consists
of 12 bytes, in six 2-byte fields. <br>
the date-descriptor array has the following form: <br>
<br>
<br>
<br>
unsigned date<br>
int fmarked<br>
int calarms<br>
unsigned fileblockoffset<br>
int reserved<br>
unsigned reserved<br>
<br>
following are the members in the date-descriptor array: <br>
<br>
date specifies the date, in days past 1/1/1980. <br>
fmarked specifies which mark(s) are set for the date: box = 128,
parentheses = 256, circle = 512, cross = 1024, <br>
underscore = 2048. <br>
calarms specifies the number of alarms set for the day. <br>
fileblockoffset specifies the file offset, in 64-byte blocks, to the
day's information. only the low 15 bits are used (the high bit <br>
will be zero). thus, if this offset is 6, the day's information is stored at byte 6*64 in
the file. <br>
reserved reserved; must be 0xfff. <br>
reserved reserved; must be 0xfff. <br>
<br>
day-specific information<br>
<br>
all day information is stored after the date-descriptor array, on even 64-byte boundaries.
the day-information structure has the <br>
following form: <br>
<br>
<br>
<br>
unsigned reserved<br>
unsigned date<br>
unsigned reserved<br>
unsigned cbnotes<br>
unsigned cbappointment<br>
char notes[cbnotes]<br>
byte apptinfo[]<br>
<br>
following are the members in the day-information structure: <br>
<br>
reserved reserved; must be zero. <br>
date specifies the date, in days past 1/1/1980. <br>
reserved reserved; must be 1. <br>
cbnotes specifies the number of bytes of note information, including
null bytes. this information appears in the note <br>
array below the appointment list. <br>
cbappointment specifies the count of bytes of appointment information. <br>
notes contains the text of the note. <br>
apptinfo contains the block of appointments. <br>
<br>
appointment-specific information<br>
<br>
the information in the appointment block is stored as a list of single appointments. each
appointment consists of a structure <br>
similar to the following: <br>
<br>
<br>
<br>
struct {<br>
char cb;<br>
char flags;<br>
int time;<br>
char szapptdesc[];<br>
};<br>
<br>
following are the members in each appointment structure: <br>
<br>
cb specifies the size, in bytes, of the structure containing the
appointment. the structure address of the next <br>
appointment is the current appointment plus the value of the cb member. <br>
flags contains various flags. this member can have one or more of the
following values: <br>
<br>
value meaning<br>
<br>
1 alarm will go off at the specified time of the appointment. <br>
2 appointment is a special time. <br>
<br>
time specifies the number of minutes past midnight. <br>
szapptdesc contains a null-terminated string consisting of text
associated with an appointment. <br>
<br>
<br>
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