MCIWndCreateA function (vfw.h)

Article
02/09/2023

The MCIWndCreate function registers the MCIWnd window class and creates an MCIWnd window for using MCI services. MCIWndCreate can also open an MCI device or file (such as an AVI file) and associate it with the MCIWnd window.

Syntax

HWND VFWAPIV MCIWndCreateA(
  HWND      hwndParent,
  HINSTANCE hInstance,
  DWORD     dwStyle,
  LPCSTR    szFile
);

Parameters

hwndParent

Handle to the parent window.

hInstance

Handle to the module instance to associate with the MCIWnd window.

dwStyle

Flags defining the window style. In addition to specifying the window styles used with the CreateWindowEx function, you can specify the following styles to use with MCIWnd windows.

Value	Meaning
MCIWNDF_NOAUTOSIZEWINDOW	Will not change the dimensions of an MCIWnd window when the image size changes.
MCIWNDF_NOAUTOSIZEMOVIE	Will not change the dimensions of the destination rectangle when an MCIWnd window size changes.
MCIWNDF_NOERRORDLG	Inhibits display of MCI errors to users.
MCIWNDF_NOMENU	Hides the Menu button from view on the toolbar and prohibits users from accessing its pop-up menu.
MCIWNDF_NOOPEN	Hides the open and close commands from the MCIWnd menu and prohibits users from accessing these choices in the pop-up menu.
MCIWNDF_NOPLAYBAR	Hides the toolbar from view and prohibits users from accessing it.
MCIWNDF_NOTIFYANSI	Causes MCIWnd to use an ANSI string instead of a Unicode string when notifying the parent window of device mode changes. This flag is used in combination with MCIWNDF_NOTIFYMODE.
MCIWNDF_NOTIFYMODE	Causes MCIWnd to notify the parent window with an MCIWNDM_NOTIFYMODE message whenever the device changes operating modes. The lParam parameter of this message identifies the new mode, such as MCI_MODE_STOP.
MCIWNDF_NOTIFYPOS	Causes MCIWnd to notify the parent window with an MCIWNDM_NOTIFYPOS message whenever a change in the playback or record position within the content occurs. The lParam parameter of this message contains the new position in the content.
MCIWNDF_NOTIFYMEDIA	Causes MCIWnd to notify the parent window with an MCIWNDM_NOTIFYMEDIA message whenever a new device is used or a data file is opened or closed. The lParam parameter of this message contains a pointer to the new file name.
MCIWNDF_NOTIFYSIZE	Causes MCIWnd to notify the parent window when the MCIWnd window size changes.
MCIWNDF_NOTIFYERROR	Causes MCIWnd to notify the parent window when an MCI error occurs.
MCIWNDF_NOTIFYALL	Causes all MCIWNDF window notification styles to be used.
MCIWNDF_RECORD	Adds a Record button to the toolbar and adds a new file command to the menu if the MCI device has recording capability.
MCIWNDF_SHOWALL	Causes all MCIWNDF_SHOW styles to be used.
MCIWNDF_SHOWMODE	Displays the current mode of the MCI device in the window title bar. For a list of device modes, see the MCIWndGetMode macro.
MCIWNDF_SHOWNAME	Displays the name of the open MCI device or data file in the MCIWnd window title bar.
MCIWNDF_SHOWPOS	Displays the current position within the content of the MCI device in the window title bar.

szFile

Null-terminated string indicating the name of an MCI device or data file to open.

Return value

Returns the handle to an MCI window if successful or zero otherwise.

Remarks

Default window styles for a child window are WS_CHILD, WS_BORDER, and WS_VISIBLE. MCIWndCreate assumes a child window when a non-NULL handle of a parent window is specified.

Default window styles for a parent window are WS_OVERLAPPEDWINDOW and WS_VISIBLE. MCIWndCreate assumes a parent window when a NULL handle of a parent window is specified.

Use the window handle returned by this function for the window handle in the MCIWnd macros. If your application uses this function, it does not need to use the MCIWndRegisterClass function.

Note

The vfw.h header defines MCIWndCreate as an alias which automatically selects the ANSI or Unicode version of this function based on the definition of the UNICODE preprocessor constant. Mixing usage of the encoding-neutral alias with code that not encoding-neutral can lead to mismatches that result in compilation or runtime errors. For more information, see Conventions for Function Prototypes.

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	vfw.h
Library	Vfw32.lib
DLL	Msvfw32.dll