The SYSTEM-HELP statement calls the Microsoft Windows Help engine to display Windows Help topics, and the HTML Help engine to display HTML Help topics.
Note: Does not apply to SpeedScript programming.
Syntax
SYSTEM-HELP file-string [ WINDOW-NAME window-name] { CONTENTS
| CONTEXT int-expr | HELP-TOPIC string | KEY string | ALTERNATE-KEY string | POSITION X x Y y WIDTH dx HEIGHT dy | POSITION MAXIMIZE
| QUIT
| SET-CONTENTS int-expr | CONTEXT-POPUP int-expr | PARTIAL-KEY string | MULTIPLE-KEY char TEXT string | COMMAND string | FINDER
| FORCE-FILE
| HELP
}
file-string
The file-string parameter is a character expression that specifies the pathname of a help file. If the file has a .chm extension (the extension for compiled Microsoft HTML Help files), the Microsoft HTML Help viewer is launched. If the file has a .hlp file extension, the Microsoft Windows Help viewer is launched. The pathname can contain Unicode characters. See OpenEdge Development: Internationalizing Applications for more information about Unicode.
WINDOW-NAME window-name
This option is supported for Windows Help (.hlp files) only.
The window-name parameter is a character expression that evaluates to the primary or secondary window name as defined in the [WINDOWS] section of the help project file. If the window name is omitted, or if "main" is specified, the primary help window is used.
CONTENTS
Supported only for backward compatibility.
For HTML Help, this option displays the Microsoft HTML Help viewer with the default topic in the content pane. Use the HELP-TOPIC option to specify the topic to display.
For Windows Help, this option displays the help topic defined as the contents in the [OPTIONS] section of the help project file.
CONTEXT int-expr
Displays the help topic that the context number identifies. You define context numbers in the [MAP] section of the help project file.
The int-expr parameter is the context number for the help topic.
HELP-TOPIC string
This option is supported for HTML Help (.chm files) only.
Displays a help topic in the content pane of the Microsoft HTML Help viewer.
The string parameter is a character expression that indicates the topic (.htm/.html file) within the compiled Microsoft HTML Help (.chm) file to display.
KEY string
For HTML Help, this option displays the topic matching the string found in the keyword index. Use semicolons in the string parameter to delimit multiple keywords. If no match is found, Microsoft HTML Help displays the help viewer with the Index tab on top.
For Windows Help, this option displays the help topic matching the string found in the index keyword list. If there is more than one match, it displays the first topic containing the keyword. If there is no match or the string is omitted, a message is displayed indicating that the keyword is invalid. The string parameter is a character expression that evaluates to a keyword for the desired help topic.
ALTERNATE-KEY string
This option is supported for HTML Help (.chm files) only. For Windows Help (.hlp files), see the MULTIPLE-KEY option.
Displays a help topic matching the string found in the alternate keyword (Alink) index.
The string parameter is a character expression that evaluates to a keyword in the alternate keyword index.
POSITION X x Y y WIDTH dx HEIGHT dy
Positions an existing (already opened) help window as specified.
The x parameter is an integer expression that specifies the x coordinate for the help window.
The y parameter is an integer expression that specifies the y coordinate for the help window.
The dx parameter is an integer expression that specifies the width of the help window.
The dy parameter is an integer expression that specifies the height of the help window.
POSITION MAXIMIZE
Maximizes an existing (already opened) help window.
QUIT
Informs the help application that help is no longer required. If no other applications are using help, the operating system closes the help application.
SET-CONTENTS int-expr
Supported only for backward compatibility. This option is supported for Windows Help (.hlp files) only.
Dynamically re-maps the contents help topic from what is defined in the [OPTIONS] section of the help project file. When a CONTENTS call is made, the new contents help topic is displayed.
The int-expr parameter is the context number for the new contents help topic.
CONTEXT-POPUP int-expr
This option is supported for Windows Help (.hlp files) only.
Displays the help topic in a pop-up window that the context number identifies. You define context numbers in the [MAP] section of the help project file. If a non-scrolling region exists in a help topic, only that region displays when you use the CONTEXT-POPUP option to display the topic.
The int-expr parameter is the context number for the help topic.
PARTIAL-KEY string
This option is supported for Windows Help (.hlp files) only.
Displays the help topic matching the string found in the keyword list. In Windows, if there is more than one match, no match, or if the string is omitted, it displays the Help Topics: Window Help Topics dialog box with the Index tab on top.
The string parameter is a character expression that evaluates to a partial key for the desired help topic.
MULTIPLE-KEY char TEXT string
This option is supported for Windows Help (.hlp files) only. For HTML Help, see the ALTERNATE-KEY option.
Displays the help topic matching a keyword from an alternate keyword table.
The char parameter is a character expression that evaluates to the single character keyword table identifier for the required table.
The string parameter is a character expression that evaluates to the keyword that is located in the keyword table.
COMMAND string
This option is supported for Windows Help (.hlp files) only.
Executes a help macro.
The string parameter is a character expression that evaluates to the help macro to execute.
FINDER
This option is supported for Windows Help (.hlp files) only.
Displays the Help Topics: Windows Help Topics dialog box, which contains an Index tab, a Find tab, and optionally a Contents tab, with the most recently used tab displayed on top.
If a Contents tab file (.CNT file) is present when you initially call the Help Topics: Windows Help dialog box, then the Content tab displays on top. However, if a .CNT file is not present, then the dialog box displays with the Index tab on top; the Contents tab is not available.
FORCE-FILE
This option is supported for Windows Help (.hlp files) only.
Ensures that the correct help file is open and displayed.
HELP
This option is supported for Windows Help (.hlp files) only.
Displays the contents of the ABL Help-on-Help file. In Windows, HELP displays the Help Topics: Windows Help Topics dialog box.
Example
The following example demonstrates several features of the SYSTEM-HELP statement with the Procedure Editor help file (editeng.chm). The user can select a button to demonstrate each of the following SYSTEM-HELP options: CONTEXT, KEY, ALTERNATE-KEY, POSITION, POSITION-MAXIMIZE, and QUIT.
To execute this procedure, first copy the editeng.chm file from DLC\prohelp to your current working directory (by default, C:\OpenEdge\WRK). Then open and run r-syshlpchm.p in the Procedure Editor.
/* The CONTEXT call displays the help topic associated with the specified
context number of a help topic (in this case, 49256, for the Using Editor
Buffers topic). */
ON CHOOSE OF b_context IN FRAME x DO:
SYSTEM-HELP helpfile CONTEXT 49256.
END.
/* The KEY call brings up the topic matching the string found in the keyword
index. If the string parameter is empty or is omitted altogether, the help
viewer displays with the Index tab on top.*/
ON CHOOSE OF b_blank IN FRAME x DO:
SYSTEM-HELP helpfile KEY "".
END.
/* In a KEY call where the string parameter does not exactly match an index
keyword of any help topic, the fill-in at the top of the Index tab is
populated with the string that is passed in, and the default help topic
is displayed. */
ON CHOOSE OF b_single IN FRAME x DO:
SYSTEM-HELP helpfile KEY "Tools".
END.
/* In a KEY call where the string parameter exactly matches a unique index
keyword of a help topic, the help engine automatically launches a help
viewer window and displays the matching topic. Use semicolons to delimit
multiple keywords.*/
ON CHOOSE OF b_full IN FRAME x DO:
SYSTEM-HELP helpfile KEY "Tools;Menu".
END.
/* In an ALTERNATE-KEY call works like the KEY call but it uses the alternate
keyword (Alink) index, if one is provided. */
ON CHOOSE OF b_alt IN FRAME x DO:
SYSTEM-HELP helpfile ALTERNATE-KEY "Tools Menu".
END.
/* The POSITION X x Y y WIDTH dx HEIGHT dy call positions the open help window
as specified */
ON CHOOSE OF b_pos IN FRAME x DO:
SYSTEM-HELP helpfile POSITION X 2 Y 2 WIDTH 450 HEIGHT 450.
END.
/* The POSITION MAXIMIZE call maximizes the open help window as specified*/
ON CHOOSE OF b_max IN FRAME x DO:
SYSTEM-HELP helpfile POSITION MAXIMIZE.
END.
/* The QUIT call causes the help engine to terminate, unless another
application is using help. */
ON CHOOSE OF b_quit IN FRAME x DO:
SYSTEM-HELP helpfile QUIT.
RETURN.
END.
