DosRequestVDD - Parameters

hvdd (HVDD) - input

The handle of a VDD returned by a previous call to DosOpenVDD.

sgid (SGID) - input

The identifier of a specific DOS session, or null.

cmd (ULONG) - input

A function code that is specific to a virtual device.

cbInput (ULONG) - input

The length, in bytes, of the application data in pInput.

pInput (PVOID) - input

The address of the command-specific information.

The system sends this data to the virtual device driver to process the specified command.

cbOutput (ULONG) - input

The length, in bytes, of pOutput.

pOutput (PVOID) - output

The address of the buffer where the VDD returns the information for the specified command.

This information is specific to the command and the virtual device driver.

ulrc (APIRET) - returns

Return Code.

DosRequestVDD returns one of the following values:

• NO_ERROR 6
  ERROR_INVALID_HANDLE
  21
  ERROR_NOT_READY
  644
  ERROR_INVALID_CALLER
  For a full list of error codes, see Errors.

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