| # ITK Programmer's Guide
Table of contents | Intro | General | TCP Low Level | TCP High Level | UDP | DNS | PPP Encoding/Decoding | Internet Config | Goodies | Cryptography & SSL | Appendix
Chapter 8 : Conversion routines
Chapter contents: |
Text conversions: ITK_Text2HTML ITK_HTML2Text ITK_Text2ISO ITK_ISO2Text ITK_Text2URL ITK_URL2Text ITK_Text2B64 ITK_B642Text ITK_Text2Quoted ITK_Quoted2Text ITK_Text2uu ITK_uu2Text Picture conversions: ITK_Pict2GIF | File conversions: ITK_Mac2Bin ITK_Bin2Mac ITK_Mac2Hqx ITK_Hqx2Mac ITK_Mac2uu ITK_uu2Mac ITK_Mac2gzip ITK_gzip2Mac Date conversions: ITK_RFC2Secs ITK_Secs2RFC ITK_Date2Secs ITK_Secs2Date
About this chapter... | This chapter describes ITK's conversion routines for text, pictures, files, dates and blobs.

##
Text conversions

Notes :

- under Windows, 4D uses the Mac extended ASCII table, so all 4D texts are called as "4D text".
  To convert 4D text into real Windows extended ASCII text, you can use ACI_Pack or some new routine in 4Dv6.

ITK_Text2HTML
Syntax: | HTMLText := ITK_Text2HTML (text;options)
Description: | Converts "4D text" to HTML. By default, all HTML special characters like "<", ">", "&" are converted unless options is set to 1. All 8bit characters are always converted (ex: é -> &eacute;).
Params: |
In/Out | Parameter | Type |  | Example or note
-> | text | Text | Text to convert | Do not pass very long text as the converted text will generally be longer and that text values are limited to 32000 chars in 4D.
-> | options | Longint | Conversion options | 0 = full conversion 1 = only convert 8bit chars (existing tags will not be converted). 2 = same as option 1, but do not convert "&" at all (introduced in v2.0.4)
<- | HTMLText | Text | Converted text |
Example: |
    $myText := "<B>é</B>"
    $HTML := ITK_Text2HTML($myText) ` returns "&lt;B&gt;&eacute;&lt;/B&gt;"
    $HTML := ITK_Text2HTML($myText; 1) ` returns "<B>&eacute;</B>"

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ITK_HTML2Text
Syntax: | text := ITK_HTML2Text (HTMLText;options)
Description: | Converts HTML text to Mac text. By default, all HTML special characters like "<", ">", "&" are converted unless options is set to 1. All 8bit characters are always converted (ex: é -> &eacute;).
Params: |
In/Out | Parameter | Type |  | Example or note
-> | HTMLText | Text | HTML text to convert |
-> | options | Longint | Conversion options | 0 = full HTML conversion 1 = reduced HTML conversion ( "&lt;", "&gt;" , "&amp;" and "&quot;" are not converted 2 = extract text (remove HTML tags)
<- | text | Text | Converted text |
Example: |
    $myHTMLText := "&lt;B&gt;&eacute;&lt;/B&gt;"
    $myText := ITK_HTML2Text($myText) ` returns "<B>é</B>"
    $myText := ITK_HTML2Text($myText; 1) ` returns "&lt;B&gt;é&lt;/B&gt;"
    $myText := ITK_HTML2Text($myText; 2) ` returns "é" (tags removed)

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ITK_Text2ISO
Syntax: | ISOText := ITK_Text2ISO (text;options)
Description: | Convert "4D text" to ISO-8859 text. ISO-8859 defines standard extended ASCII tables for different languages and alphabets (Latin, Cyrillic, etc.). ISO conversion is a table based conversion. This means that the length of the converted text is unchanged.
Params: |
In/Out | Parameter | Type |  | Example or note
-> | text | Text | "4D text" to convert |
-> | options | Longint | Conversion options | 0 or 1 = use ISO-8859-1 table (Latin-1) 2 = use ISO-8859-2 table (Latin-2) 7 = use ISO-8859-7 table 9 = use ISO-8859-9 table 11 = use ISO-8859-11 table 13 = ISO-8859-13 20 = use ISO-IR-111 table Note : new tables can be added to ITK by modifying ITK's resources. Table names are retrieved through STR#15002. Tables are stored in ITK's resources.
<- | ISOtext | Text | Converted text |
Example: |
    $iso := ITK_Text2ISO("é") ` convert to ISO-8859-1 (Latin-1)

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ITK_ISO2Text
Syntax: | text := ITK_ISO2Text (ISOtext;options)
Description: | Convert ISO-8859 text to "4D text" . ISO-8859 defines standard extended ASCII tables for different languages and alphabets (Latin, Cyrillic, etc.). ISO conversion is a table based conversion. This means that the length of the converted text is unchanged.
Params: |
In/Out | Parameter | Type |  | Example or note
-> | ISOtext | Text | ISO text to convert |
-> | options | Longint | Conversion options | 0 or 1 = use ISO-8859-1 table (Latin-1) 2 = use ISO-8859-2 table (Latin-2) 7 = use ISO-8859-7 table 9 = use ISO-8859-9 table 11 = use ISO-8859-11 table 13 = ISO-8859-13 20 = use ISO-IR-111 table Note : new tables can be added to ITK by modifying ITK's resources. Table names are retrieved through STR#15001. Tables are stored in ITK's resources.
<- | ISOtext | Text | Converted text |
Example: |
    $iso := ITK_ISO2Text(ITK_Text2ISO("é")) ` should return "é" !

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ITK_Text2URL
Syntax: | URLText := ITK_Text2URL (text;options)
Description: | Convert text to URL encoded text. Two type of URL encoded text are supported by ITK: standard URL translation (to use in HTML link for example), form URL translation (to use in URL encoded form data).
Params: |
In/Out | Parameter | Type |  | Example or note
-> | text | Text | text to convert |
-> | options | Longint | Conversion options | 0 = standard URL 1 = form URL translation 2 = full encoding (unsafe+reserved, see RFC1738, §2.2) 4 = do not apply ISO encoding before URL encoding (added in v2.0.4)
<- | URLtext | Text | Converted text |
Example: |
    ` standard URL translation
    $url := ITK_Text2URL("Test 4D+ITK.html")   ` returns "Test+4D%2BITK.html"

    ` form URL translation
    $url := ITK_Text2URL("Test 4D+ITK.html";1) ` returns "Test%204D+ITK.html"

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ITK_URL2Text
Syntax: | text := ITK_URL2Text (URLtext;options)
Description: | Convert URL encoded text (standard or form translation) to "4D text". Two type of URL encoded text are supported by ITK: standard URL translation (to use in HTML link for example), form URL translation (to use in URL encoded form data).
Params: |
In/Out | Parameter | Type |  | Example or note
-> | URLtext | Text | URL encoded text to convert |
-> | options | Longint | Conversion options | 0 = form URL translation ("+" are translated into " ") 1 = standard URL translation ("+" are not translated) 4 = do not apply ISO decoding after URL decoding (added in v2.0.4)
<- | text | Text | Converted text |
Example: |
    ` form URL translation
    $url := ITK_URL2Text("Test+4D%2BITK.html")   ` returns "Test 4D+ITK.html"

    ` standard URL translation
    $url := ITK_URL2Text ("Test+4D%2BITK.html";1) ` returns "Test+4D+ITK.html"

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ITK_Text2B64
Syntax: | base64text := ITK_Text2B64 (text;options)
Description: | Convert text to Base64. The Base64 conversion is a 8bit to 6bit conversion (3 chars are encoded into 4 chars). The resulting text will be 33% larger than the original.
Note: | For proper Base64 encoding, please refer to RFC1521. To comply with MIME, the output stream (encoded bytes) must be represented in lines of no more than 76 characters each. Padding at the end of the data is performed using the '=' character (use option value 1).
Params: |
In/Out | Parameter | Type |  | Example or note
-> | text | Text | text to convert | Do not pass very long texts as the resulting text will grow by 33%. The limit is around 24000 bytes.
-> | options | Longint | Conversion options | 0 = no option 1 = add padding if required (since ITK v2.0.3)
<- | base64text | Text | Base64 converted text |
Example: |
    $b64 := ITK_Text2B64("mypassword")

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ITK_B642Text
Syntax: | text := ITK_B642Text (base64text;options)
Description: | Decodes Base64 text. The Base64 conversion is a 8bit to 6bit conversion (4 chars decoded into 3 chars). The resulting text will be 25% smaller than the original.
Params: |
In/Out | Parameter | Type |  | Example or note
-> | base64text | Text | Base64 text to decode |
-> | options | Longint | Conversion options | Currently unused, pass 0 or nothing.
<- | text | Text | decoded text |
Example: |
    $pass := ITK_B642Text($B64pass)

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ITK_Text2Quoted
Syntax: | qpText := ITK_Text2Quoted (text;options)
Description: | Encodes some text into "quoted-printable" text. Quoted-printable is a 7bit format that converts 8bit characters into an 6bit encoded representation (ex: "é" -> "=EA"). 7bit characters are not encoded except the equal sign. Quoted-printable also deals will lines wrap and text lines to limit their length (wrapped lines are terminated by a space and an equal sign).
Params: |
In/Out | Parameter | Type |  | Example or note
-> | text | Text | Text to encode |
-> | options | Longint | Conversion options | 0 = apply ISO 8859-1 encoding before converting to quoted-printable 1 = do not apply ISO encoding
<- | qpText | Text | Quoted-Printable encode text. |
Example: |
    $qpISOText := ITK_Text2Quoted($myText) ` apply ISO conversion
    $qpPlainText := ITK_Text2Quoted($myText;1) ` no ISO conversion

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ITK_Quoted2Text
Syntax: | text := ITK_Quoted2Text (qpText;options)
Description: | Decodes quoted-printable encoded text. Quoted-printable is a 7bit format that converts 8bit characters into an 6bit encoded representation (ex: "é" -> "=EA"). 7bit characters are not encoded except the equal sign. Quoted-printable also deals will lines wrap and text lines to limit their length (wrapped lines are terminated by a space and an equal sign). This routines restores wrapped lines into their original state.
Params: |
In/Out | Parameter | Type |  | Example or note
-> | qpText | Text | Quoted-Printable text to decode |
-> | options | Longint | Conversion options | 0 = apply ISO 8859-1 decoding after Quoted-Printable decoding. 1 = do not apply ISO decoding
<- | text | Text | decoded text |
Example: |
    $macText := ITK_Quoted2Text($myQPtext) ` apply ISO decoding
    $isoText := ITK_Quoted2Text($myQPtext;1) ` no ISO decoding

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ITK_Text2uu
Syntax: | uuText := ITK_Text2uu (text;options)
Description: | Encodes text to uuencode format. The uuencode conversion is a 8bit to 6bit conversion (3 chars are encoded into 4 chars). The resulting text will be 33% larger than the original.
Params: |
In/Out | Parameter | Type |  | Example or note
-> | text | Text | text to encode | Do not pass very long texts as the resulting text will grow by 33%. The limit is around 24000 bytes.
-> | options | Longint | encoding options | Currently unused, pass 0 or nothing.
<- | uuText | Text | uuEncoded text |
Example: |
    $uu := ITK_Text2uu("text portion")

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ITK_uu2Text
Syntax: | decodedText := ITK_uu2Text (uuText;options)
Description: | Decodes "uu" encoded text. The uuencode conversion is a 8bit to 6bit conversion (3 chars are encoded into 4 chars). The decoded text will be 25% smaller than the encoded version.
Params: |
In/Out | Parameter | Type |  | Example or note
-> | uuText | Text | text to decode |
-> | options | Longint | decoding options | Currently unused, pass 0 or nothing.
<- | decodedText | Text | decoded text |
Example: |
    $t := ITK_uu2Text($uuText)

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##
Picture conversions

ITK_Pict2GIF
Syntax: | gifPicture := ITK_Pict2GIF (picture; flag; gifWidth; gifHeight; transpHoriz; transpVert)
Description: | Compresses a picture in GIF format. An option flag can be use to create an interlaced and/or transparent GIF picture. By default, transparency uses the first pixel (top, left) of the original picture as the transparent colour, but you can also specify any pixel as being the transparent colour. The resulting picture can also be resize.
Warning: | You can store these GIF encoded pictures in 4D records, but do not try to display or do any manipulation on them, 4D doesn't know how to display and manipulate GIF encoded pictures. This can cause 4D to crash .
Params: |
In/Out | Parameter | Type |  | Example or note
-> | picture | Picture | Original 4D picture | This picture must be in a classical "PICT" displayable format. Do not pass GIF or JFIF pictures.
-> | flag | Longint | Transparency and interlace options | 0 = normal GIF 1 = interlaced GIF 2 = transparent GIF 3 = interlaced transparent GIF
-> | gifWidth | Longint | Pixel width of resulting GIF | Pass 0 to keep the original picture width.
-> | gifHeight | Longint | Pixel height of resulting GIF | Pass 0 to keep the original picture height
-> | transpHoriz | Longint | Horizontal coordinate of transparent pixel |
-> | transpVert | Longint | Vertical coordinate of transparent pixel |
<- | gifPicture | Picture | Resulting GIF encoded picture | May return an empty picture if an error occurred (like memory error or bad original picture).
Example: |
    $myGIF := ITK_Pict2GIF(myPicture;2;0;0;100;50) ` transparent pixel is (100,50)

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##
File conversions

ITK_Mac2Bin
Syntax: | error := ITK_Mac2Bin (macPath;binPath)
Description: | Encodes a file into MacBinary format. MacBinary format allows to store both the data fork and the resource fork of a file with all finder information in a data fork only file. This is useful under MacOS. MacBinary is a 8bit file format.
Params: |
In/Out | Parameter | Type |  | Example or note
-> | macPath | Text | Pathname of the Mac file to encode | Be sure to pass a MacOS formatted pathname under MacOS and a Windows pathname under Windows.
-> | binPath | Text | Pathname of the resulting MacBinary file. | Be sure to pass a MacOS formatted pathname under MacOS and a Windows pathname under Windows.
<- | error | Longint | OS error code |
Example: |
    $err := ITK_Mac2Bin("MyHD:MyFolder:Myfile";"MyHD:MyFolder:MyFile.bin") ` MacOS

    $err := ITK_Mac2Bin("C:\MyHD\MyFolder\Myfile";"C:\MyHD\MyFolder\MyFile.bin") ` Windows

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ITK_Bin2Mac
Syntax: | error := ITK_Bin2Mac (binPath;macPath)
Description: | Decodes a MacBinary file into an original Mac file.
Params: |
In/Out | Parameter | Type |  | Example or note
-> | binPath | String | Pathname of the MacBinary file to decode | Be sure to pass a MacOS formatted pathname under MacOS and a Windows pathname under Windows.
-> | macPath | String | Pathname of the resulting file. | Be sure to pass a MacOS formatted pathname under MacOS and a Windows pathname under Windows.
<- | error | Longint | OS error code |
Example: |
    $err := ITK_Bin2Mac("MyHD:MyFolder:Myfile.bin";"MyHD:MyFolder:MyFile") ` MacOS

    $err := ITK_Bin2Mac ("C:\MyHD\MyFolder\Myfile.bin";"C:\MyHD\MyFolder\MyFile") ` Windows

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ITK_Mac2Hqx
Syntax: | error := ITK_Mac2Hqx (macPath;binhexPath)
Description: | Encodes a file into BinHex 4.0 format. BinHex 4.0 format allows to store both the data fork and the resource fork of a file with most finders information in a 6bit data fork only file. This is useful under MacOS. BinHex 4.0 is a 6bit file format which can be used to send attachments in email.
Params: |
In/Out | Parameter | Type |  | Example or note
-> | macPath | Text | Pathname of the Mac file to encode | Be sure to pass a MacOS formatted pathname under MacOS and a Windows pathname under Windows.
-> | binhexPath | Text | Pathname of the resulting BinHex file. | Be sure to pass a MacOS formatted pathname under MacOS and a Windows pathname under Windows.
<- | error | Longint | OS error code |
Example: |
    $err := ITK_Mac2Hqx("MyHD:MyFolder:Myfile";"MyHD:MyFolder:MyFile.hqx") ` MacOS

    $err := ITK_Mac2Hqx ("C:\MyHD\MyFolder\Myfile";"C:\MyHD\MyFolder\MyFile.hqx") ` Windows

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ITK_Hqx2Mac
Syntax: | error := ITK_Hqx2Mac (binhexPath;macPath)
Description: | Decodes a BinHex 4.0 file into an original Mac file.
Params: |
In/Out | Parameter | Type |  | Example or note
-> | binhexPath | String | Pathname of the MacBinary file to decode | Be sure to pass a MacOS formatted pathname under MacOS and a Windows pathname under Windows.
-> | macPath | String | Pathname of the resulting file. | Be sure to pass a MacOS formatted pathname under MacOS and a Windows pathname under Windows.
<- | error | Longint | OS error code |
Example: |
    $err := ITK_Hqx2Mac("MyHD:MyFolder:Myfile.hqx";"MyHD:MyFolder:MyFile") ` MacOS

    $err := ITK_Hqx2Mac ("C:\MyHD\MyFolder\Myfile.hqx";"C:\MyHD\MyFolder\MyFile") ` Windows

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ITK_Mac2uu
Syntax: | error := ITK_Mac2uu (macPath; uuPath; fileName)
Description: | Encodes a file into uuencode format. uuencode is a standard Unix 6bit encoding file format. uuencode does not deal with resource forks and finder information.
Params: |
In/Out | Parameter | Type |  | Example or note
-> | macPath | String | Pathname of the original file | Be sure to pass a MacOS formatted pathname under MacOS and a Windows pathname under Windows.
-> | uuPath | String | Pathname of the resulting file. | Be sure to pass a MacOS formatted pathname under MacOS and a Windows pathname under Windows.
-> | fileName | String | Original filename used for decoding | This filename appears at the beginning of the uuencoded data. This filename can be different from the original filename provided in "macPath".
<- | error | Longint | OS error code |
Example: |
     ` MacOS
    $err := ITK_Mac2uu("MyHD:MyFolder:Myfile";"MyHD:MyFolder:MyFile.uu"; "MyFile.dat")

     ` Windows
    $err := ITK_Mac2uu("C:\MyHD\MyFolder\Myfile";"C:\MyHD\MyFolder\MyFile.uu"; "MyFile")

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ITK_uu2Mac
Syntax: | error := ITK_uu2Mac (uuPath;macPath)
Description: | Decodes a "uuencoded" file into an original Mac file.
Params: |
In/Out | Parameter | Type |  | Example or note
-> | uuPath | String | Pathname of the MacBinary file to decode | Be sure to pass a MacOS formatted pathname under MacOS and a Windows pathname under Windows.
-> | macPath | String | Pathname of the resulting file. | Be sure to pass a MacOS formatted pathname under MacOS and a Windows pathname under Windows.
<- | error | Longint | OS error code |
Example: |
    $err := ITK_uu2Mac("MyHD:MyFolder:Myfile.uu";"MyHD:MyFolder:MyFile") ` MacOS

    $err := ITK_uu2Mac("C:\MyHD\MyFolder\Myfile.uu";"C:\MyHD\MyFolder\MyFile") ` Windows

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ITK_Mac2gzip
Syntax: | error := ITK_Mac2gzip (macPath; gzipPath; level)
Description: | Compresses a file into gzip format (normally ending with ".gz"). gzip is a standard compressed file format defined in RFC#1952 which uses the deflate compression algorithm (based on LZ77 and Huffman coding, see RFC#1951) and contains a CRC to detect data corruption (see RFC#1950). gzip compression can also be used in HTTP to send compressed data (see RFC#1945 sections 3.5, 10.3 and D.2.3 for explanation on the use of gzip in HTTP/1.0 and RFC#2616 sections 3.5, 14.3 and 14.11 for explanation on the use of gzip in HTTP/1.1).
Note: | Under MacOS, only the datafork of the original file will be compressed. If you want to compress a full MacOS file (including data and resource fork as well as signatures and other file informations), you should convert your original file into a MacBinary file (using ITK_Mac2Bin ) before compressing it using ITK_Mac2gzip (see example below).
Params: |
In/Out | Parameter | Type |  | Example or note
-> | macPath | String | Pathname of the original file | Be sure to pass a MacOS formatted pathname under MacOS and a Windows pathname under Windows.
-> | gzipPath | String | Pathname of the compressed file. | Be sure to pass a MacOS formatted pathname under MacOS and a Windows pathname under Windows.
-> | level | Longint | Compression level | 0 = default 1 = faster compression ... 9 = smaller files, but slower compression
<- | error | Longint | OS error code | 0 = no error -1 = error while opening the original file -2 = error while creating/opening the compressed file. -3 = error while reading from the original file -4 = error while writing the compressed file -5 = error while closing the compressed file
Example: |
     ` MacOS - data fork only
    $err := ITK_Mac2gzip("MyHD:MyFolder:Myfile";"MyHD:MyFolder:MyFile.gz")  ` default compression

     ` MacOS - full Mac File
    $err := ITK_Mac2Bin ("MyHD:MyFolder:Myfile";"MyHD:MyFolder:Myfile.temp") ` convert to MacBinary
    $err := ITK_Mac2gzip("MyHD:MyFolder:Myfile.temp";"MyHD:MyFolder:MyFile.gz")

     ` Windows
    $err := ITK_Mac2gzip("C:\MyHD\MyFolder\Myfile";"C:\MyHD\MyFolder\MyFile.gz")

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ITK_gzip2Mac
Syntax: | error := ITK_gzip2Mac (uuPath;macPath)
Description: | Decompresses a gzip compressed file (normally ending with ".gz"). gzip is a standard compressed file format defined in RFC#1952 which uses the deflate compression algorithm (based on LZ77 and Huffman coding, see RFC#1951) and contains a CRC to detect data corruption (see RFC#1950). gzip compression can also be used in HTTP to send compressed data (see RFC#1945 sections 3.5, 10.3 and D.2.3 for explanation on the use of gzip in HTTP/1.0 and RFC#2616 sections 3.5, 14.3 and 14.11 for explanation on the use of gzip in HTTP/1.1).
Params: |
In/Out | Parameter | Type |  | Example or note
-> | gzipPath | String | Pathname of the zip compressed file | Be sure to pass a MacOS formatted pathname under MacOS and a Windows pathname under Windows.
-> | macPath | String | Pathname of the decompressed file | Be sure to pass a MacOS formatted pathname under MacOS and a Windows pathname under Windows.
<- | error | Longint | OS error code | 0 = no error -1 = error while opening the original file -2 = error while creating/opening the compressed file. -3 = error while writing the decompressed file -4 = error while closing the decompressed file -5 = error while closing the compressed file -6 = error while reading the compressed file
Example: |
    $err := ITK_gzip2Mac("MyHD:MyFolder:Myfile.gz";"MyHD:MyFolder:MyFile") ` MacOS - data fork only

    ` MacOS - full Mac file
    $err := ITK_gzip2Mac("MyHD:MyFolder:Myfile.gz";"MyHD:MyFolder:MyFile.temp")
    $err := ITK_Bin2Mac("MyHD:MyFolder:MyFile.temp";"MyHD:MyFolder:MyFile")

    $err := ITK_gzip2Mac("C:\MyHD\MyFolder\Myfile.gz";"C:\MyHD\MyFolder\MyFile") ` Windows

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##
Date conversions

ITK_RFC2Secs
Syntax: | gmtValue := ITK_RFC2Secs (rfcString)
Description: | Converts an RFC#822 or RFC#1123 formatted date and time string (example: Fri, 28-Jul-1995 22:50:10 +0100) into a GMT date/time value.
Note: | ITK_RFC2Secs and ITK_Date2Secs are always returning a GMT based value, so you can compare them directly. Y2K Compliance : note that if the rfcString passed is formatted according to RFC#822 (which uses only 2 digits for the year), this routine will not be Y2K compliant. Be sure to pass RFC#1123 formatted string which are using 4 digits for the year.
Params: |
In/Out | Parameter | Type |  | Example or note
-> | rfcString | String | RFC formatted date/time string (see example) | This string must be formatted according to RFC#822 or RFC#1123.
<- | gmtValue | Longint | GMT Date/Time value. |
Example: | To convert an RFC date/time string into the corresponding GMT RFC date/time string use `theString := ITK_Secs2RFC(` `ITK_RFC2Secs` `(theString);1)` To compare two RFC date/time strings, converts them into GMT date/time values, ex: `If (` `ITK_RFC2Secs` `(myRFCdate1)>` `ITK_RFC2Secs` `(myRFCdate2)) ...`

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ITK_Secs2RFC
Syntax: | rfcString := ITK_Secs2RFC (gmtValue;timeZoneFlag)
Description: | Converts a GMT date/time value into an RFC#822 or RFC#1123 formatted date and time string (example: Fri, 28-Jul-1995 22:50:10 +0100). You can specify if the resulting RFC string must be in GMT time zone or local time zone (according to your computer time zone settings).
Note: | ITK_RFC2Secs and ITK_Date2Secs are always returning a GMT based value, so you can compare them directly. Y2K Compliance : This routine is Y2K compliant.
Params: |
In/Out | Parameter | Type |  | Example or note
-> | gmtValue | Longint | GMT date/time value | As returned by ITK_RFC2Secs or ITK_Date2Secs.
-> | timeZoneFlag | Longint | flag to indicate in which time zone the result must be provided. | 0 = local Time Zone 1 = GMT Time Zone
<- | rfcString | String | RFC#1123 formatted string | "Fri, 28-Jul-1995 22:50:10 +0100"
Example: | To convert an RFC date/time string into the corresponding GMT RFC date/time string use `theString :=` `ITK_Secs2RFC` `(ITK_RFC2Secs(theString);1)` To get the current date and time in GMT time zone: `theString :=` `ITK_Secs2RFC` `(ITK_Date2Secs(Current Date; CurrentTime;1);1)`

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ITK_Date2Secs
Syntax: | gmtValue := ITK_Date2Secs (date;time;timeZoneFlag)
Description: | Converts a date and time (4D formats) into an GMT date/time value. You can specify if the given date and time are in local time zone or GMT.
Warning: | If you pass a local date and time (like Current Date and Current Time), be sure to specify local time zone in the timeZoneFlag, otherwise, the resulting gmtValue will not be correct according to your local time zone and GMT time zone. See examples below. Y2K Compliance : This routine is Y2K compliant.
Params: |
In/Out | Parameter | Type |  | Example or note
-> | date | Date | Date to convert | This date is in 4D standard format.
-> | time | Time | Time to convert | This time is in 4D standard format.
-> | timeZoneFlag | Longint | indicates in which time zone the date and time are given. | 0 = GMT time zone 1 = local time zone
<- | gmtValue | Longint | GMT date/time value |
Example: | `$secs :=` `ITK_Date2Secs` `(Current date; Current time; 1) ` local time (in local time zone) $secs :=` `ITK_Date2Secs` `(!12/25/96!;Ý00:00:00Ý;0) ` Christmas date, GMT time`

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ITK_Secs2Date
Syntax: | ITK_Secs2Date (gmtValue;date;time;timeZoneFlag)
Description: | Converts GMT date/time value into a date and time (4D formats). You can specify if the resulting date and time must be returned in local time zone or GMT. Y2K Compliance : This routine is Y2K compliant.
Params: |
In/Out | Parameter | Type |  | Example or note
-> | gmtValue | Longint | GMT date/time value | As returned by ITK_RFC2Secs or ITK_Date2Secs.
<- | date | Date | Corresponding date | This date is in 4D standard format.
<- | time | Longint | Corresponding time (as a Longint) | This time is in 4D standard format.
-> | timeZoneFlag | Longint | Indicates in which time zone the date and time should be returned. | 0 = local time zone 1 = GMT time zone
Example: | `` Get date/Time in 4 hours` `$dt := ITK_Date2Secs(Current Date; Current Time;1) $dt := $dt + (4*60*60) ` add 4 hours` `ITK_Secs2Date` `($dt;$nextDate;$nextTime;0) `local Time Zone`
Note: | The returned time is typed as a LONGINT. To get the corresponding value in a TIME variable, simply use the following code: `C_LONGINT($timeAsLong) C_TIME($timeAsTime)` `ITK_Secs2Date` `($dt;$date;$timeAsLong;0) `local Time Zone $timeAsTime := $timeAsLong`

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CQ/21-Feb-2001