打印机页面尺寸的单位

Printer.PageWidth
Integer that receives the width of a page on the printer, in 1/100ths of an inch. 

devmode.dmPaperLength
For printer devices only, overrides the length of the paper specified by the dmPaperSize member, either for custom paper sizes or for devices such as dot-matrix printers that can print on a page of arbitrary length. These values, along with all other values in this structure that specify a physical length, are in tenths of a millimeter.

  度 缩写     等值       公值
  码   yd.         3尺     0.914米
  尺   ft.         12寸   30.48厘米
  寸   in.                     2.54厘米