Windows Dev Center

IWiaItem::DeviceDlg method

The IWiaItem::DeviceDlg method is used by applications to display a dialog box to the user to prepare for image acquisition.

Syntax


HRESULT DeviceDlg(
  [in]  HWND      hwndParent,
  [in]  LONG      lFlags,
  [in]  LONG      lIntent,
  [out] LONG      *plItemCount,
  [out] IWiaItem* **ppIWiaItem
);

Parameters

hwndParent [in]

Type: HWND

Handle of the parent window of the dialog box.

lFlags [in]

Type: LONG

Specifies a set of flags that control the dialog box's operation. Can be set to any of the following values:

FlagMeaning
0Default behavior.
WIA_DEVICE_DIALOG_SINGLE_IMAGERestrict image selection to a single image in the device image acquisition dialog box.
WIA_DEVICE_DIALOG_USE_COMMON_UIUse the system UI, if available, rather than the vendor-supplied UI. If the system UI is not available, the vendor UI is used. If neither UI is available, the function returns E_NOTIMPL.

 

lIntent [in]

Type: LONG

Specifies what type of data the image is intended to represent. For a list of image intent values, see Image Intent Constants.

Note  This method ignores all WIA_INTENT_IMAGE_* image intents.
plItemCount [out]

Type: LONG*

Receives the number of items in the array indicated by the ppIWiaItem parameter.

ppIWiaItem [out]

Type: IWiaItem***

Receives the address of an array of pointers to IWiaItem interfaces.

Return value

Type: HRESULT

If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.

Remarks

This method displays a dialog box to the user that an application uses to gather all the information required for image acquisition. For instance, this dialog box enables the user to select images to download from a camera. When using a scanner, it is also used to specify image scan properties such as brightness and contrast.

After this method returns, the application can use the IWiaDataTransfer interface to acquire the image.

Applications must call the IUnknown::Release method for each element in the array of interface pointers they receive through the ppIWiaItem parameter. Applications must also free the array using CoTaskMemFree.

It is recommended that applications make device and image selection available through a menu item named From scanner or camera on the File menu.

Requirements

Minimum supported client

Windows 2000 Professional, Windows XP [desktop apps only]

Minimum supported server

Windows Server 2003 [desktop apps only]

Header

Wia.h

Library

Wiaguid.lib

DLL

Wiaservc.dll

 

 

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