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Inside Macintosh: More Macintosh Toolbox /

Chapter 4 - List Manager / List Manager Reference

List Manager Routines / Accessing and Manipulating Cell Data

LSetCell

You can use the LSetCell procedure to change the data contained in a cell.

PROCEDURE LSetCell (dataPtr: Ptr; dataLen: Integer; theCell: Cell;
                    lHandle: ListHandle);

dataPtr

A pointer to the new data for a cell.

dataLen

The length in bytes of the data pointed to by the dataPtr parameter.

theCell

The coordinates of the cell to hold the new data.

lHandle

The list containing the cell given in the theCell parameter.

DESCRIPTION

The LSetCell procedure sets the data of the cell specified by the parameter theCell to dataLen bytes of data beginning at the location specified by dataPtr. Any previous cell data in theCell is replaced.

If the cell coordinates specified by the theCell parameter are invalid, then LSetCell does nothing.

WARNING

If there is insufficient memory in the heap, the LSetCell procedure may fail to set the cell's data.

If the data of a visible cell is changed and the automatic drawing mode is enabled, LSetCell updates the list.

SPECIAL CONSIDERATIONS

You should not call the LSetCell procedure from within an interrupt, such as in a completion routine or VBL task.

ASSEMBLY-LANGUAGE INFORMATION

The trap macro and routine selector for the LSetCell procedure are

Trap macro	Selector
_Pack0	$0058

SEE ALSO

For an example that sets the data of cells in a list, see Listing 4-4 on page 4-22.