Parameters

DocNum	Document index for the document that you want a metafile picture of (1-32). In practice this will generally (though not necessarily) be the return value of a call to DPlot_Plot.
cx, cy	Requested width and height of the metafile, in inches.

Return Values

0	Generic error attempting to communicate with DPlot. This most often indicates that DPlot is currently busy, e.g. a modal dialog box is open.
>0	Handle to an enhanced metafile. This picture may be drawn in your application with the Windows API function PlayEnhMetaFile.