VAL structure (wiamicro.h)

The VAL structure is used by the microdriver and WIA Flatbed driver to pass information between each other.

Syntax

typedef struct VAL {
  LONG      lVal;
  double    dblVal;
  GUID      *pGuid;
  PSCANINFO pScanInfo;
  HGLOBAL   handle;
  WCHAR     **ppButtonNames;
  HANDLE    *pHandle;
  LONG      lReserved;
  CHAR      szVal[MAX_ANSI_CHAR];
} VAL, *PVAL;

Members

lVal

Specifies a command value to return to the WIA Flatbed driver. See WIA Microdriver Commands for a list of available commands for this parameter.

dblVal

Specifies a command value to return to the WIA Flatbed driver. See WIA Microdriver Commands for a list of available commands for this parameter.

pGuid

Points to the GUID of the pressed button. If no button was pressed, this member points to GUID_NULL.

pScanInfo

Points to a SCANINFO structure.

handle

Points to a ShutDown event handle that will be signaled by the WIA Flatbed Driver when the driver is being unloaded or shut down.

ppButtonNames

Specifies the address of a pointer to an array of button names.

pHandle

Points to an event handle.

lReserved

Reserved. Do not use.

szVal[MAX_ANSI_CHAR]

Specifies the device name in ASCII form. If needed for interrupt checking, the microdriver can use this name to pass to CreateFile in order to obtain a file handle to the device.

Requirements