HP 3000 Manuals HP 3000 Manuals
Chapter 5 Opening a File Before your program can read, write, or otherwise manipulate a file, the program must initiate access to that file by opening it with the HPFOPEN/FOPEN intrinsic call. This call applies to both disk files and device files. This chapter discusses how you can use HPFOPEN to open various types of files supported by MPE/iX. Examples of program segments are provided to illustrate HPFOPEN calls. This chapter is divided into the following subjects: * how the file system opens a file * which to use: HPFOPEN or FOPEN? * opening a disk file * opening a system-defined file * opening a device file