CodePudding user response:
Is basic specifications according to the definition of file data to write data to the file data memory two-way conversion code, such as read VCT to a pile of so-called primitive object code, read the DBF or SHP general data structure, and from general data and then converted to SHP primitive object code, finally, because the unity to the primitive object level, the two-way repeatedly read API calls, optional paste composition, on-demand invocation,CodePudding user response:
Standard to read and write, according to the definition of the file data is read carefully the file definition, from which a byte what information how many bytes, where is the file header information, every line of figures of start-stop, how to determine the type of data in each field, belonging to the column name of how to just read from the structure of the header information, etc., it is need some basic knowledge of the classroom, need more practice, is not very easy to learn now sell now,