VideoPortQueryServices function (video.h)
The VideoPortQueryServices function exposes a specified interface that is implemented by the video port driver.
Syntax
VIDEOPORT_API VP_STATUS VideoPortQueryServices(
[in] IN PVOID HwDeviceExtension,
[in] IN VIDEO_PORT_SERVICES ServicesType,
[in, out] IN OUT PINTERFACE Interface
);
Parameters
[in] HwDeviceExtension
Pointer to the miniport driver's device extension.
[in] ServicesType
A value from the VIDEO_PORT_SERVICES enumerated type that specifies which interface is being requested.
[in, out] Interface
Pointer to an INTERFACE structure, which contains basic information about the requested interface. See the following Remarks section for more information.
Return value
If VideoPortQueryServices succeeds, it returns NO_ERROR; otherwise, it returns an error code.
Remarks
If the ServicesType parameter is set to VideoPortServicesI2C, the Interface parameter must be a pointer to a VIDEO_PORT_I2C_INTERFACE structure, cast as a pointer to an INTERFACE structure.
Similarly, if the ServicesType parameter is set to VideoPortServicesAGP, the Interface parameter must be a pointer to either a VIDEO_PORT_AGP_INTERFACE structure, or a VIDEO_PORT_AGP_INTERFACE_2 structure, each cast as a pointer to an INTERFACE structure.
The VIDEO_PORT_AGP_INTERFACE and VIDEO_PORT_AGP_INTERFACE_2 structures are nearly identical, except that the latter structure has a member that points to the AgpSetRate function, which is used to reset the transfer rate for an AGP chipset. A video miniport driver querying AGP support should call VideoPortQueryServices first with Interface pointing to a VIDEO_PORT_AGP_INTERFACE_2 structure. If that call fails, the miniport driver can then make another call to VideoPortQueryServices, this time with Interface pointing to a VIDEO_PORT_AGP_INTERFACE structure.
If the ServicesType parameter is set to VideoPortServicesInt10, the Interface parameter must be a pointer to a VIDEO_PORT_INT10_INTERFACE structure, cast as a pointer to an INTERFACE structure.
If the ServicesType parameter is set to VideoPortServicesDebugReport, the Interface parameter must be a pointer to a VIDEO_PORT_DEBUG_REPORT_INTERFACE structure, cast as a pointer to an INTERFACE structure.
If the ServicesType parameter is set to VideoPortServicesWCMemoryProtection, the Interface parameter must be a pointer to a VIDEO_PORT_WCMEMORYPROTECTION_INTERFACE structure, cast as a pointer to an INTERFACE structure.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available in Windows XP and later versions of the Windows operating systems. |
| Target Platform | Desktop |
| Header | video.h (include Video.h) |
| Library | Videoprt.lib |
| DLL | Videoprt.sys |
| IRQL | PASSIVE_LEVEL |