CallWD: Function specific to the external language

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Management of external languages

CallWD: Function specific to the external language

Use

Syntax

Notes

See also

CallWD: Function specific to the external language

Use

Calls a WLanguage function from an external language.

Caution: This function must not be used in a WINDEV application. Indeed, this function is not a WLanguage function.

Using specific preset functions

// From a program written in C, C++, Java or Visual Basic
// Open the "Window" window
CallWD("Open,Window.WDW")
// Switch the window to edit
CallWD("Screen,Input")
// Call a global WLanguage procedure
CallWD("pMyCollection.CalculateOrder(2451478)")

Using the entire WLanguage code (slower because performs a dynamic compilation of code)

// From a program written in Pascal...
// Open the "Window" window
CallWD('Open,Window.WDW')
// Call a global WLanguage procedure
CallWD('pMyCollection.CalculateOrder(2451478)')

Syntax

From a program written in C, C++, Java or Visual Basic

CallWD("<Function Name>,<Function Parameters>")

CallWD("<WLanguage Code>")

From a program written in Pascal or Delphi

CallWD('<Function Name>,<Function Parameters>')

CallWD('<WLanguage Code>')

From a program written in Cobol

call "_CallWD" using by reference "<Function Name>,<Function Parameters>" & x"00"

call "_CallWD" using by reference "<WLanguage Code>" & x"00"

From a program written in Fortran

CALL CallWD(LOC('<Function Name>,<Function Parameters>'C))

CALL CallWD(LOC('<WLanguage Code>'C))

Details of parameters

<Function Name>: Character string

Name of the function to call. This function corresponds to:
a WLanguage function.
a function specific to the external language. See remarks for more details.

<Function Parameters>: Character string

Parameters of function called.
The different parameters are separated by a comma.
If the parameters are enclosed in double quotes or in single quotes, they must be doubled.

<WLanguage Code>: Character string

WLanguage code to run.
The code will compiled dynamically and run. It can be:
a simple call to a function, most frequent case,
a complex WLanguage code built dynamically.
As the code is compiled dynamically, there is a compilation step that makes this type of calls less efficient than the calls that use preset functions in external language.
Remark: If double quotes or single quotes are found in the string, they must be doubled.

Notes

Function specific to the external language

Some actions are automatically performed by WINDEV (a window automatically becomes editable when it is opened for example). This is the reason why no WLanguage function can be used to perform these actions.

However, when using a WINDEV element from a program written in an external language, these actions must be specified.

The following functions are used to perform the actions automatically performed by WINDEV:


Displays	Displays a value in a control or assigns a value in a variable.
DisplayLongText	Displays a long text in a text control in Pascal and in C.
Beep	Used to emit a beep on the speaker of the computer.
Library,Disk	Opens the project library that is stored on disk.
Library,Error	Loads the file that contains the error messages managed by WDXXXEXE.DLL in the requested language. If no Library, Error is called, the error messages are displayed in French by default.
Confirm	Displays a dialog box that includes a logo, a message, the "Yes", "No" and "Cancel" buttons, and returns the button validated by the user.
Screen,Column	Returns the subscript of the current subscripted column in a browsing table or in a memory table.
Screen,Coordinate	Retrieves the coordinates of the control in relation to the top left border of the window as well as the physical size of a control.
Screen,Current	Retrieves the name of the control currently in edit and its subscript if possible.
Screen,ScreenToFile	Initializes the file items with the value of the window controls linked to these items.
Screen,FileToScreen	Initializes the window controls with the values of the file items linked to the controls.
Screen,First	Displays a long text in a text control in Pascal and in C.
Screen,Raz	Resets to zero (for a numeric control) or clears (for the other types of controls) the content of the controls found in the current window. The list boxes and the combo boxes cannot be reset to zero.
Screen,Get	Retrieves the value in a control or in a variable. The space characters found at the end of WdString are deleted by default.
Screen,Input	Starts the input in the controls of a window.
Screen,Selection	Modifies the status of a control (invisible, active, inactive, grayed).
Screen,Next	Returns the name of the next editable control.
Screen,XVar	Defines whether a control is included (or not) in the current window.
Error	Displays a dialog box containing an error logo and the message passed in parameter.
Space	Fills the content of WdString with space characters on the right.
Execute	Runs the code of a control or the code of a procedure in WLanguage.
Window	Returns the number of windows opened at a given time.
Close	Closes the current window and restores the context that existed before the window opening.
Handle	Returns the handle of a window or control.
HsMenu,Status	Returns the status of a menu option (active, invisible, grayed).
HsMenu,Label	Modifies the caption of a menu option.
HsMenu,Mark	Finds out whether a menu option is marked or not.
HsMenu,Name	Adds a menu into the window that is opened. The menu is the menu of another window.
HsMenu,Select	Selects or deselects, makes invisible, marks or unmarks an option found in the current menu.
iPrintReport	Prints a report created with the report editor.
Info	Displays a dialog box containing an information logo and the message passed in parameter
LCommand	Returns the command line passed in parameter to the executable program. WdString contains the command line passed in parameter to the executable program (without the name of the executable itself).
List,Add	Adds an element into a drop-down list or into an expanded list.
List,Search	Finds a value in a list. The search performed is an exact-match search.
List,Insert	Inserts an element at a given subscript into a drop-down list or into an expanded list.
List,Modify	Modifies an element in a drop-down list or in an expanded list.
List,Count	Returns the number of elements found in a list.
List,Position	Positions on the first element displayed in the list box or returns the subscript of the first element displayed.
List,Get	Retrieves the value of a given element or the value of the selected element in a drop-down list or in an expanded list.
List,Select,?	Returns the element selected in the list.
List,Select,-	Deselects an element from a drop-down list or from an expanded list.
List,Select,+	Selects an element in a drop-down list or in an expanded list. This function is mainly used to handle multiselection list boxes.
List,Delete	Deletes an element from a drop-down list or from an expanded list. The following elements are moved up by one rank.
Message	Displays a message in the status bar
Multitask	Allows the programs currently run to process the Windows messages or runs a temporization.
Nation	Defines the display language in the windows and controls for the titles, captions, messages, ...
Option,Space	Fills the content of WdString with space characters on the right.
Option,Test	In an information window, displays each call to the function and each status report returned by the function.
Option,Version	Finds out the version number of WINDEV wdXXXVM.DLL.
Yes,No	Displays a dialog box that includes a logo, a message and the "Yes" and "No" buttons. The user must validate one of the buttons ("Yes" or "No") to close the window
Open	Opens a window.
Project	Opens and runs a WINDEV project. The first project window is displayed and the input is automatically enabled in this window.
Get	Retrieves the value of a control.
Hourglass	Displays a mouse pointer shaped like an hourglass.
SoundInit	Initializes the sound interpreter. This function must be run once in each program. It is used to calibrate the execution speed of the sounds. This function may take a few minutes.
WavPlay	Plays the requested sound. The sound interpreter must be initialized by SoundInit.
Style	Loads a style sheet.
Table,Display	Refreshes the display of the table. The calculated controls are recalculated. The table is repositioned according to the data file.
Table,Add	Adds an element into a table.
Table,Search	Finds a value in a memory table. The search is an exact-match search.
Table,Col	Returns the subscript of the column.
Table,Save	Modifies or adds a record in the data file linked to the table.
Table,Insert	Inserts an element at a given subscript into a table.
Table,Modify	Modifies an element in a table.
Table,Count	Returns the number of elements found in a table.
Table,Position	Points to a given element or returns the element in the first row of a memory table.
Table,Get	Retrieves the value of a given element or the value of the selected element in a table.
Table,Select,?	Returns the subscript of the element selected in the table.
Table,Select,+	Selects an element in a table.
Table,Delete	Deletes an element from a table.
Test	Displays each function call and each status report returned by the function.
Use	Opens the specified window by closing all the windows opened beforehand.
WDEnd	Ends a program that is using WINDEV.
Windows,TCurrent	Modifies the title of the current window.
Windows,Title	Modifies the title of the next window (or dialog box) displayed.
Windows,TNext	Modifies the title of the next window (or dialog box) displayed.