从Rinex格式的GPS观测文件（即O文件）中提取所需卫星的VC程序-Observations from the GPS satellites needed to document the procedures to extract

GPS编程，其环境是MFC和API两种情况。在熟悉VC的MFC以及API应用之后了解和学习GPS编程的好文档。-GPS programming, the environment is MFC and API two kinds of cases. In the familiar with VC the MFC application and API after learning about the good programming and GPS document.