Map a Bulk Data Frame for reading and/or writing

If you want to access your image data via mapping use STFMAP (SCFMAP). This routine `maps' an existing Bulk Data Frame (or parts of it) into virtual memory for reading and/or writing. The technique used to map data returns a pointer which is definitely not very FORTRAN like. Look at the examples in Appendix to see how this problem is solved for FORTRAN programs (for C there is no problem anyway). If the file has been opened using a different data format than the original format, data are converted automatically.