This method returns the standard values E_INVALIDARGand E_FALSE, as well as the following:

S_OK

The method completed successfully.

Source Providers and their associated Source ID's are part of a mechanism that supports per-provider customization of the PIM experience on Windows Mobile devices.

A Source Provider is a custom function that customizes the PIM user experience. Typically, a Source Provider has a corresponding associate function that is responsible for synchronizing PIM data with the Windows Mobile device. Data synchronized with the Windows Mobile device by this associate function is marked with a Source identification tag (Source ID). When Outlook Mobile displays a PIM item, it checks to see if the item has a Source ID. If it finds one, it invokes the Source Provider, which customizes the user interface for the PIM item.

When users enter new contacts and appointments, they can select a Source Provider to associate with them.

A valid Source ID is a DWORD with only 1 bit set (i.e., there are 32 possible Source IDs).

Although Contact and Appointment items, regardless of Source ID, are synchronized with Microsoft Exchange—Source IDs are not.

Source IDs are not supported for Task items.

Since Contacts and Appointments can be associated with only one Source Provider, your Source Provider installation implementation must select a Source ID that is unique in the domain of all Source Providers installed on the Windows Mobile device (it is considered an error to determine Source IDs prior to install). Your implementation must choose a unique Source ID by first iterating over the installed Source Providers registered in the key \HKLM\PIMSources\, and then choosing the next available Source ID.

The default Source ID value is zero (0). Contact and Appointment items with a Source ID value of zero are not associated with a Source Provider, and just use the default user interface.

Your Source Provider uninstall implementation must reset the Source ID field of all associated Contact and Appointment items back to zero.

The Contact item OID is passed as a parameter to IPimSrcContactListIcon::Paintso that the Source Provider can look up any additional properties it might require in order to determine how to draw the Contact item.

Sources must draw using a transparent background.

The following code example demonstrates how to use Paint. CTestProvideris the class that implements the COM server for the source provider, and it derives from IPimSrcContactListIcon.

Note:
To make the following code example easier to read, security checking and error handling are not included. This code example should not be used in a release configuration unless it has been modified to include them.

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// The following are assumed to be already defined in the resource and header files. // #define IDI_APP_PROVIDERICON 101; // static LPTSTR g_szIconResource = MAKEINTRESOURCE(IDI_APP_PROVIDERICON); // IDI_APP_PROVIDERICON ICON DISCARDABLE "SampleIcon.ico"; STDMETHODIMP CTestProvider::Paint(const SRCCUSTOMDRAW *pscd, CEOID oid) { HRESULT hr = S_OK; // Load an icon from the resource, and setup the required resources. HICON hIcons = LoadIcon((HINSTANCE) g_hInstance, g_szIconResource); // Draw the custom icon using the RECT information. DrawIconEx(pscd->hdc, pscd->rc.left, pscd->rc.top, hIcons, (pscd->rc.right - pscd->rc.left), (pscd->rc.bottom - pscd->rc.top), 0, NULL, DI_NORMAL); DestroyIcon(hIcons); return hr; }