Class Icons

The icon used to represent a class object can be specified in the iconPath attribute in the DisplaySpecifiers container. Moreover, each class can store multiple icon states. For example, a folder class can have icons for the open, closed, and disabled states. The current implementation accepts a maximum of sixteen different icon states per class.

The iconPath attribute can be specified in one of two ways.

<state>,<icon file name>

or

<state>,<module file name>,<resource ID>

In these examples, the "<state>" is an integer with a value between 0 and 15. The value 0 is defined to be the default or closed state of the icon. The value 1 is defined to be the open state of the icon. The value 2 is the disabled state. All other values are application-defined.

The "<icon file name>" is the path and file name of an icon file that contains the icon image.

The "<module file name>" is the path and file name of a module, such as an EXE or DLL, that contains the icon image in a resource. The "<resource ID>" is an integer that specifies the resource identifier of the icon resource within the module.

Adding a Value to the iconPath Attribute

To add a value to the iconPath attribute, perform the following steps.

1. Determine if the value for the attribute exists. If a value is to be replaced, first, delete the existing value using the IADs::PutEx method with the lnControlCode parameter set to ADS_PROPERTY_DELETE and the vProp parameter set to the value to be removed. Do not use ADS_PROPERTY_CLEAR or ADS_PROPERTY_UPDATE for lnControlCode.
2. Create the string that represents the attribute icon data. For an example, see the format above.
3. To add the new value, use the IADs::PutEx method with the lnControlCode parameter set to ADS_PROPERTY_APPEND.
4. To commit changes to the directory, call IADs::SetInfo.