wiasReadPropFloat function (wiamdef.h)
The wiasReadPropFloat function retrieves a floating-point property value from a WIA item.
Syntax
HRESULT wiasReadPropFloat(
[in] BYTE *pWiasContext,
PROPID propid,
[out] FLOAT *pfVal,
[out, optional] FLOAT *pfValOld,
BOOL bMustExist
);
Parameters
[in] pWiasContext
Pointer to a WIA item context.
propid
Specifies the property identifier.
[out] pfVal
Pointer to a memory location that receives the floating-point value of the property.
[out, optional] pfValOld
Pointer to a memory location that receives the former floating-point value of the property. If this information is not needed, set this parameter to NULL.
bMustExist
Indicates whether the property must exist. If set to TRUE, the property must exist; if set to FALSE, it does not have to exist.
Return value
On success, the function returns S_OK. If the function fails, it returns a standard COM error or one of the WIA_ERROR_XXX errors (described in the Microsoft Windows SDK documentation).
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available in Microsoft Windows Me and in Windows XP and later versions of the Windows operating systems. |
| Target Platform | Desktop |
| Header | wiamdef.h (include Wiamdef.h) |
| Library | Wiaservc.lib |
| DLL | Wiaservc.dll |