Programmer's Reference > Sending data to DPlot from another application

Macro commands may be used either in macros or by sending the commands to DPlot via dynamic data exchange (DDE). Some commands are valid only in macros (noted by Macros Only). Commands sent to DPlot via DDE must be enclosed by square brackets [ ]. Macro commands should not include the brackets.

Command parameters shown in the descriptions below are placeholders for the actual values. Command parameters are either numeric values, equations that evaluate to numbers, or character strings. Character string parameters are always bound by double quotation marks. Equations must be preceded by an equals sign (=).

The pipe symbol (|) in the command syntax indicates that a parameter is optional, and should not be included in your macro unless otherwise noted.

All indices into arrays are 1-based, e.g. Curve1=1 refers to the first curve in a plot.

A 0x prefix for numbers in the descriptions below indicates hexadecimal notation; e.g. 0x0010 = 16.

JR/Viewer indicates that the command is supported by DPlot Jr or DPlot Viewer.
JR/Viewer indicates that the command is NOT supported by DPlot Jr or DPlot Viewer.

[XYXY(n,x1,y1,x2,y2,…,xn,yn)]

JR Viewer

Adds n data points to the curve selected with the SelectCurve command. If this operation would cause the number of points in the curve to exceed the array sizes (set with FileArrays), DPlot returns DDE_FNOTPROCESSED to a DDE client, or causes an error in the DPlot macro facility.

This method of sending data to DPlot is considerably faster than the [XY()] command and is particularly useful in environments like Visual Basic that do not readily allow you to send binary data via DDE. Of particular importance, the maximum command string length that DPlot will process is 32768 characters, including the command itself and all delimiters and spaces. For this reason you should limit the number of points sent with XYXY to a maximum of about 1000. If your application requires sending more than 1000 points, use multiple XYXY commands in separate XTYP_EXECUTE (LinkExecute in VB jargon) transactions.

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