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# Lisafunktsioonid programmeerimisel LibreOffice Calcis

The method of extending Calc by Add-Ins that is described in the following is outdated. The interfaces are still valid and supported, to ensure compatibility with existing Add-Ins, but for programming new Add-Ins you should use the new API functions.

LibreOffice Calc can be expanded by Add-Ins, which are external programming modules providing additional functions for working with spreadsheets. These are listed in the Function Wizard in the Add-In category. If you would like to program an Add-In yourself, you can learn here which functions must be exported by the shared libraryexternal DLL so that the Add-In can be successfully attached.

LibreOffice searches the Add-in folder defined in the configuration for a suitable shared libraryDLL. To be recognized by LibreOffice, the shared libraryDLL must have certain properties, as explained in the following. This information allows you to program your own Add-In for Function Wizard of LibreOffice Calc.

## Lisafunktsioonide kontseptsioon

Each Add-In library provides several functions. Some functions are used for administrative purposes. You can choose almost any name for your own functions. However, they must also follow certain rules regarding parameter passing. The exact naming and calling conventions vary for different platforms.

### Functions of Shared LibraryAddIn DLL

At a minimum, the administrative functions GetFunctionCount and GetFunctionData must exist. Using these, the functions as well as parameter types and return values can be determined. As return values, the Double and String types are supported. As parameters, additionally the cell areas Double Array, String Array, and Cell Array are supported.

Parameters are passed using references. Therefore, a change of these values is basically possible. However, this is not supported in LibreOffice Calc because it does not make sense within spreadsheets.

Libraries can be reloaded during runtime and their contents can be analyzed by the administrative functions. For each function, information is available about count and type of parameters, internal and external function names and an administrative number.

The functions are called synchronously and return their results immediately. Real time functions (asynchronous functions) are also possible; however, they are not explained in detail because of their complexity.

## Üldine teave kasutajaliidese kohta

The maximum number of parameters in an Add-In function attached to LibreOffice Calc is 16: one return value and a maximum of 15 function input parameters.

Andmetüübid on määratud järgnevalt:

Andmetüüp | Definitsioon
CALLTYPE | Windows'is: FAR PASCAL (_far _pascal) Mujal: vaikimisi (operatsioonisüsteemis määratud vaikeväärtus)
USHORT | 2-baidine märgita täisarv
DOUBLE | 8-baidine platvormist sõltuv vorming
Paramtype | Platvormist sõltuv nagu int PTR_DOUBLE =0 viit pikale reaalarvule PTR_STRING =1 viit nulliga lõpetatud stringile PTR_DOUBLE_ARR =2 viit pikkade reaalarvude massiivile PTR_STRING_ARR =3 viit stringide massiivile PTR_CELL_ARR =4 viit lahtrite massiivile NONE =5

## Shared LibraryDLL functions

Following you will find a description of those functions, which are called at the Shared Libraryexternal DLL.

For all Shared LibraryDLL functions, the following applies:

void CALLTYPE fn(out, in1, in2, ...)

Output: Resulting value

Input: Any number of types (double&, char*, double*, char**, Cell area), where the Cell area is an array of types double array, string array, or cell array.

### GetFunctionCount()

Returns the number of functions without the management functions of the reference parameter. Each function has a unique number between 0 and nCount-1. This number will be needed for the GetFunctionData and GetParameterDescription functions later.

Süntaks

void CALLTYPE GetFunctionCount(USHORT& nCount)

Parameeter

USHORT &nCount:

Output: Reference to a variable, which is supposed to contain the number of Add-In functions. For example: If the Add-In provides 5 functions for LibreOffice Calc, then nCount=5.

### GetFunctionData()

Tuvastab kogu olulise teabe lisafunktsiooni kohta.

Süntaks

void CALLTYPE GetFunctionData(USHORT& nNo, char* pFuncName, USHORT& nParamCount, Paramtype* peType, char* pInternalName)

Parameeter

USHORT& nNo:

Input: Function number between 0 and nCount-1, inclusively.

char* pFuncName:

Output: Function name as seen by the programmer, as it is named in the Shared LibraryDLL. This name does not determine the name used in the Function Wizard.

USHORT& nParamCount:

Output: Number of parameters in AddIn function. This number must be greater than 0, because there is always a result value; the maximum value is 16.

Paramtype* peType:

Output: Pointer to an array of exactly 16 variables of type Paramtype. The first nParamCount entries are filled with the suitable type of parameter.

char* pInternalName:

Output: Function name as seen by the user, as it appears in the Function Wizard. May contain umlauts.

The pFuncName and pInternalName parameters are char arrays, which are implemented with size 256 in LibreOffice Calc.

### GetParameterDescription()

Provides a brief description of the Add-In function and its parameters. As an option, this function can be used to show a function and parameter description in the Function Wizard.

Süntaks

void CALLTYPE GetParameterDescription(USHORT& nNo, USHORT& nParam, char* pName, char* pDesc)

Parameeter

USHORT& nNo:

Input: Number of the function in the library; between 0 and nCount-1.

USHORT& nParam:

Input: Indicates, for which parameter the description is provided; parameters start at 1. If nParam is 0, the description itself is supposed to be provided in pDesc; in this case, pName does not have any meaning.

char* pName:

Output: Takes up the parameter name or type, for example, the word "Number" or "String" or "Date", and so on. Implemented in LibreOffice Calc as char[256].

char* pDesc:

Output: Takes up the description of the parameter, for example, "Value, at which the universe is to be calculated." Implemented in LibreOffice Calc as char[256].

pName and pDesc are char arrays; implemented in LibreOffice Calc with size 256. Please note that the space available in the Function Wizard is limited and that the 256 characters cannot be fully used.

## Lahtrite alad

The following tables contain information about which data structures must be provided by an external program module in order to pass cell areas. LibreOffice Calc distinguishes between three different arrays, depending on the data type.

### Pikkade reaalarvude massiiv

As a parameter, a cell area with values of the Number/Double type can be passed. A double array in LibreOffice Calc is defined as follows:

Offset | Name | Kirjeldus
0 | Vrg1 | Veeru number lahtrite ala ülemises vasakpoolses nurgas. Nummerdus algab 0-st.
2 | Rd1 | Rea number lahtrite ala ülemises vasakpoolses nurgas. Nummerdus algab 0-st.
4 | Tab1 | Tabeli number lahtrite ala ülemises vasakpoolses nurgas. Nummerdus algab 0-st.
6 | Vrg2 | Veeru number lahtrite ala alumises parempoolses nurgas. Nummerdus algab 0-st.
8 | Rd2 | Rea number lahtrite ala alumises parempoolses nurgas. Nummerdus algab 0-st.
10 | Tab2 | Tabeli number lahtrite ala alumises parempoolses nurgas. Nummerdus algab 0-st.
12 | Count | Number of the following elements. Empty cells are not counted or passed.
14 | Col | Elemendi veeru number. Nummerdus algab 0-st.
16 | Row | Elemendi rea number. Nummerdus algab 0-st.
18 | Tab | Elemendi tabeli number. Nummerdus algab 0-st.
20 | Error | Vea kood, kusjuures väärtus 0 tähendab, et "viga puudub". Kui element pärineb valemiga lahtrist, määrab vea koodi valem.
22 | Value | 8-baidine IEEE muutuja tüübiga pikk reaalarv / ujukomaarv
30 | ... | Järgmine element

### Stringide massiiv

Lahtrite ala, mis sisaldab väärtusi andmetüübiga tekst ja mida käsitletakse kui stringide massiivi. Stringide massiiv on LibreOffice Calcis defineeritud järgnevalt:

Offset | Name | Kirjeldus
0 | Vrg1 | Veeru number lahtrite ala ülemises vasakpoolses nurgas. Nummerdus algab 0-st.
2 | Rd1 | Rea number lahtrite ala ülemises vasakpoolses nurgas. Nummerdus algab 0-st.
4 | Tab1 | Tabeli number lahtrite ala ülemises vasakpoolses nurgas. Nummerdus algab 0-st.
6 | Vrg2 | Veeru number lahtrite ala alumises parempoolses nurgas. Nummerdus algab 0-st.
8 | Rd2 | Rea number lahtrite ala alumises parempoolses nurgas. Nummerdus algab 0-st.
10 | Tab2 | Tabeli number lahtrite ala alumises parempoolses nurgas. Nummerdus algab 0-st.
12 | Count | Number of the following elements. Empty cells are not counted or passed.
14 | Col | Elemendi veeru number. Nummerdus algab 0-st.
16 | Row | Elemendi rea number. Nummerdus algab 0-st.
18 | Tab | Elemendi tabeli number. Nummerdus algab 0-st.
20 | Error | Vea kood, kusjuures väärtus 0 tähendab, et "viga puudub". Kui element pärineb valemiga lahtrist, määrab vea koodi valem.
22 | Pikkus | Length of the following string, including closing zero byte. If the length including closing zero byte equals an odd value a second zero byte is added to the string so that an even value is achieved. Therefore, Len is calculated using ((StrLen+2)&~1).
24 | String | String sulgeva null-baidiga
24+Len | ... | Järgmine element

### Lahtrite massiiv

Cell arrays are used to call cell areas containing text as well as numbers. A cell array in LibreOffice Calc is defined as follows:

Offset | Name | Kirjeldus
0 | Vrg1 | Veeru number lahtrite ala ülemises vasakpoolses nurgas. Nummerdus algab 0-st.
2 | Rd1 | Rea number lahtrite ala ülemises vasakpoolses nurgas. Nummerdus algab 0-st.
4 | Tab1 | Tabeli number lahtrite ala ülemises vasakpoolses nurgas. Nummerdus algab 0-st.
6 | Vrg2 | Veeru number lahtrite ala alumises parempoolses nurgas. Nummerdus algab 0-st.
8 | Rd2 | Rea number lahtrite ala alumises parempoolses nurgas. Nummerdus algab 0-st.
10 | Tab2 | Tabeli number lahtrite ala alumises parempoolses nurgas. Nummerdus algab 0-st.
12 | Count | Number of the following elements. Empty cells are not counted or passed.
14 | Col | Elemendi veeru number. Nummerdus algab 0-st.
16 | Row | Elemendi rea number. Nummerdus algab 0-st.
18 | Tab | Elemendi tabeli number. Nummerdus algab 0-st.
20 | Error | Vea kood, kusjuures väärtus 0 tähendab, et "viga puudub". Kui element pärineb valemiga lahtrist, määrab vea koodi valem.
22 | Type | Lahtri tüüp, 0 == pikk reaalarv, 1 == string
24 | Pikkuse väärtus | Kui tüüp == 0: 8-baidine IEEE muutuja tüübiga pikk reaalarv / ujukomaarv If type == 1: Length of the following string, including closing zero byte. If the length including closing zero byte equals an odd value a second zero byte is added to the string so that an even value is achieved. Therefore, Len is calculated using ((StrLen+2)&~1).
26 kui tüüp==1 | String | Kui tüüp == 1: string sulgeva null-baidiga
32 või 26+pikkus | ... | Järgmine element