How to Load WDM driver From a VxD Driver

NTDEV
1

Hi,

I have a Virtual COM Port driver written in WDM. Is it possible for
Vmm32.vxd (vcomm.vxd) to load this WDM based serial port driver…? what type
of INF file is needed for that one/ what are the modifications needed in WDM
driver…?

Thanks in Advance.

Regards,
San Wind

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2

Hi,

I have a Virtual COM Port driver written in WDM. Is it possible for
Vmm32.vxd (vcomm.vxd) to load this WDM based serial port driver…? what type
of INF file is needed for that one/ what are the modifications needed in WDM
driver…?

A WMD port driver is supported by Microsoft trough ccport.sys and
wdmmdmld.vxd.

Check http://www.microsoft.com/HWDEV/devdes/modem_up.htm for
more information.

I have this type of driver running.

For a other product this will not work.
A big data block (4k) is translated into 128 bytes from
ccport.sys and after first write completion (128 byte
from my wdm driver this communication stops.

mathias

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