ChemDraw Menu Extensions
|ChemDraw exports a number of access
functions for use in your menu extension.
CDIsStructureSelected may be used to determine if a submenu item should be enabled.
Modification of the document is supported through CDCutCurrentSelection, CDPasteSelection, CDClearCurrentSelection, CDSelectAll, and CDUnselectAll. Non-obtrusive copies of document information can also be obtained through CDCopyCurrentSelection and CDCopyDocument, while a new document can be created with a call to CDNewDocument, and an existing one can be opened with a call to CDOpenDocument.
Document and application preferences can be set and retrieved from ChemDraw using the CDGetDocumentSetting, CDSetDocumentSetting, CDGetApplicationPreference, and CDSetApplicationPreference calls. These settings will be persistent across multiple executions of ChemDraw, provided the settings are actually saved by the user.
If a ChemDraw access function returns an error, then the DLL can call CDGetApplicationErrorString for a string containing a description of the error.
Many of these access functions pass information back and forth
using handles. As a rule, if ChemDraw allocated the memory for the
handle, then the handle should be released using the CDReturnHandle call. If
the DLL allocated the handle, then ChemDraw will copy the
information, and the DLL is responsible for releasing the memory.
Handles that are allocated by the DLL and passed to ChemDraw, for
example in the CDPasteSelection call,
can release the memory as soon as the function returns from
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