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Win32 API Emulation with RTTarget-32When RTFiles-32 is used with RTTarget-32, about 30 Win32 file I/O functions are emulated by RTFiles-32. RTTarget-32 supports installable file systems and several file systems can be active at the same time. When RTTarget-32 is used without RTFiles-32, it will by default use its file system for consoles, LPTs, and RAM files. RTFiles-32, however, replaces RTTarget-32's default configuration to use console files, LPT files, and RTFiles-32's file system, but not RAM files. Here is the RTTarget-32 file I/O configuration used by RTFiles-32:
#include <Rttarget.h>
#include <Rtfiles.h>
static RTFileSystem Console =
{ RT_FS_CONSOLE, 0, 0, &RTConsoleFileSystem };
static RTFileSystem LPTFiles =
{ RT_FS_LPT_DEVICE, 0, 0, &RTLPTFileSystem };
static RTFileSystem FATFiles =
{ RT_FS_FILE | RT_FS_IS_DEFAULT, 0x7FFFFFFF, 0x00000FFF, &RTFilesFileSystem
};
RTFileSystem * RTFileSystemList[] =
{ &Console,
&LPTFiles,
&FATFiles,
NULL
};
If, for example, you want to retain RTTarget-32's RAM files but exclude the LPT file system, you could include the following configuration in your program:
#include <Rttarget.h>
#include <Rtfiles.h>
RTFileSystem Console =
{ RT_FS_CONSOLE, 0, 0, &RTConsoleFileSystem };
RTFileSystem RAMFiles =
{ RT_FS_FILE, 1 << ('R'-'A'), 0, &RTRAMFileSystem };
RTFileSystem FATFiles =
{ RT_FS_FILE | RT_FS_IS_DEFAULT, 0x0F, 0x03, &RTFilesFileSystem };
RTFileSystem * RTFileSystemList[] =
{ &Console,
&RAMFiles,
&FATFiles,
(void*) 0
} ;
With this configuration, logical drive 'R' can be used to access the RTTarget-32 RAM files. Logical drives 'A' through 'D' are reserved for RTFiles-32. For additional information about RTTarget-32's installable file systems, please refer to the RTTarget-32 Programming Manual.
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