RE: opět ekologické leptání

[J. Rotta]

Ne?tete HW-SERVER!
Byl tam program USERPORT, ktery zpristupni
porty v zadanem rozsahu i pod W2k
Vcetne zdrojaku v cecku a interface do Delph.

Pouzivam s DOS sw pro MU Alphu (emulator PIC) a
s vlastnim sw v Delphi, vse bez problemu rychle.

Neni pravda ze to je jen pro dosove aplikace

Ivos

UserPort 1 Summary
UserPort.SYS is a kernel mode driver for Windows NT/2000
that gives usermode programs access to I/O
Ports. This makes it possible to access hardware directly
from a normal executable in the same way as under
Windows 95/98/ME. This driver does not work on Windows
95/98/ME and there is really no need to run it
anyway because I/O ports are always granted to usermode
programs on these operating systems.
The driver can be used for the following purposes:
. To run software on Windows NT/2000 that normally only runs
on Windows 95/98/ME.
. To easily access hardware like the parallel port and other
I/O ports.
So what's the drawbacks with this wonderful software?
Microsoft has for security reasons prohibited usermode
access to I/O ports. Opening up I/O ports creates a big
security hole in your system. You should therefore
carefully set the grant lists to only give usermode access
to the specific I/O ports you need. The default values
opens up a wide range of I/O ports and you should narrow it
down.
If you are writing your own software you should only grant
access through the file "\\.\UserPort". Access is then
given to your program when you open the file "\\.\UserPort".
Other programs that don't open "\\.\UserPort" will
not have access to these I/O ports.
2 Installation
The driver can be installed in the following two ways:
. Copy UserPort.SYS to %WINDIR%\SYSTEM32\DRIVERS
Start UserPort.EXE and add the addresses you want and remove
the others and clock on start.
. Run UserPort.EXE with the driver filename and path as an
argument
i.e. run UserPort.EXE X:\YOURDIR\UserPort.SYS
Add the addresses you want and remove the others and clock
on start.
You should now have usermode access to the addresses you
have chosen.
3 Examples
Port instructions are not included in development
environments (such as Visual C++ and Delphi) because direct
I/O access isn't allowed by the operating system. You will
therefore need to include a portion of assembler code
into your software in order to access your hardware, see
Figure 2, 3 and 4.
Figure 4 shows how simple it now is to access hardware from
a usermode program. The UserPort package
should contain the files IOPort.c, IOPort.h and IOPort.pas
to be when developing C, C++ and Delphi programs.
BYTE inportb(UINT portid)
{
unsigned char value;
__asm mov edx,portid
__asm in al,dx
__asm mov value,al
return value;
}
void outportb(UINT portid,
BYTE value)
{
__asm mov edx,portid
__asm mov al,value
__asm out dx,al
}
if (inportb(0x379) & 0x10) { // Check "Select" pin
outportb(0x378,'A'); // Write character 'A' to printer
outportb(0x37a,inportb(0x37a) | 0x01); // Set "strobe"
Sleep(1); // Wait 1ms
outportb(0x37a,inportb(0x37a) & 0xfe); // Clear "Strobe" pin
}
Figure 2: Read I/O port Figure 3: Write I/O port
Figure 4: Print 'A' example using direct I/O access
Odchoz? zpr?va neobsahuje viry.

Zkontrolov?no antivirov?m syst?mem AVG
(http://www.grisoft.cz).
Verze: 6.0.303 / Virov? b?ze: 164 - datum vyd?n?: 24.11.2001


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Odchoz? zpr?va neobsahuje viry.

Zkontrolov?no antivirov?m syst?mem AVG
(http://www.grisoft.cz).
Verze: 6.0.303 / Virov? b?ze: 164 - datum vyd?n?: 24.11.2001