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MCI_WINDOW command

The MCI_WINDOW command specifies the window and the window characteristics for graphic devices. Digital-video, and video-overlay devices recognize this command.

To send this command, call the mciSendCommand function with the following parameters.

Parameters

Device identifier of the MCI device that is to receive the command message.

MCI_NOTIFY, MCI_WAIT, or, for digital-video devices, MCI_TEST. For information about these flags, see The Wait, Notify, and Test Flags.

Pointer to an MCI_GENERIC_PARMS structure. (Devices with extended command sets might replace this structure with a device-specific structure.)

Return Value

Returns zero if successful or an error otherwise.

Remarks

Graphic devices should create a default window when a device is opened but should not display it until they receive the MCI_PLAY command. The MCI_WINDOW command is used to supply an application-created window to the device and to change the display characteristics of an application-defined or default display window. If the application supplies the display window, it should be prepared to update an invalid rectangle on the window.

The following additional flags are used with the digitalvideo device type:

The handle of the window needed for use as the destination is included in the hWnd member of the structure identified by lpWindow.

The nCmdShow member of the structure identified by lpWindow contains parameters for setting the window state.

The lpstrText member of the structure identified by lpWindow contains an address of a buffer containing the caption used in the window title bar.

For digital-video devices, the lpWindow parameter points to an MCI_DGV_WINDOW_PARMS structure.

The following additional flags are used with the overlay device type:

Disables stretching of the image.

Enables stretching of the image.

The handle of the window used for the destination is included in the hWnd member of the structure identified by lpWindow. Set this flag to MCI_OVLY_WINDOW_DEFAULT to return to the default window.

The nCmdShow member of the lpWindow structure contains parameters for setting the window state. This flag is equivalent to calling ShowWindow with the state parameter. The constants are the same as those defined in WINDOWS.H (such as SW_HIDE, SW_MINIMIZE, or SW_SHOWNORMAL).

The lpstrText member of the structure identified by lpWindow contains an address of a buffer containing the caption used for the window.

For video-overlay devices, the lpWindow parameter points to an MCI_OVLY_WINDOW_PARMS structure.

Classifications of MCI Commands

MCI defines four command classifications: system, required, basic, and extended. The following list describes these command classifications:

• System commands are handled by MCI directly, rather than by the driver.
• Required commands are handled by the driver. All MCI drivers must support the required commands and flags.
• Basic commands (or optional commands) are used by some devices. If a device supports a basic command, it must support a defined set of flags for that command.
• Extended commands are specific to a device type or driver. Extended commands include commands, like the put (MCI_PUT) and where (MCI_WHERE) commands for the digitalvideo and overlay device types, and extensions to existing commands (like the «stretch» flag of the status (MCI_STATUS) command for the overlay device type).

While system and required commands are the minimum command set for any MCI driver, basic and extended commands are not supported by all drivers. Your application can always use system and required commands and their flags, but if it needs to use a basic or extended command or flag, it should first query the driver by using the capability (MCI_GETDEVCAPS) command. The following sections summarize the specific commands in each category.

System Commands

MCI processes the following system commands directly, rather than passing them to MCI devices.

Required Commands

All MCI devices support the following required commands.

Devices must also support a standard set of command flags for the required commands.

Basic Commands

The following list summarizes the basic commands. The use of these commands by an MCI device is optional.

If a driver supports a basic command, it must also support a standard set of flags for the command.

Extended Commands

Some MCI devices have additional commands, or they add flags to existing commands. While some extended commands apply only to a specific device driver, most of them apply to all drivers of a particular device type. For example, the command set for the sequencer device type extends the set (MCI_SET) command to add time formats that are needed by MIDI sequencers.

You should not assume that the device supports the extended commands or flags. You can use the capability (MCI_GETDEVCAPS) command to determine whether a specific feature is supported, and your application should be ready to deal with «unsupported command» or «unsupported function» return values.

The following extended commands are available with the listed device types.

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