mciSendString function

The mciSendString function sends a command string to an MCI device. The device that the command is sent to is specified in the command string.

Syntax

MCIERROR mciSendString(
   LPCTSTR lpszCommand,
   LPTSTR  lpszReturnString,
   UINT    cchReturn,
   HANDLE  hwndCallback
);

Parameters

• lpszCommand
  Pointer to a null-terminated string that specifies an MCI command string. For a list, see Multimedia Command Strings.

• lpszReturnString
  Pointer to a buffer that receives return information. If no return information is needed, this parameter can be NULL.

• cchReturn
  Size, in characters, of the return buffer specified by the lpszReturnString parameter.

• hwndCallback
  Handle to a callback window if the "notify" flag was specified in the command string.

Return value

Returns zero if successful or an error otherwise. The low-order word of the returned DWORD value contains the error return value. If the error is device-specific, the high-order word of the return value is the driver identifier; otherwise, the high-order word is zero. For a list of possible error values, see MCIERR Return Values.

To retrieve a text description of return values, pass the return value to the mciGetErrorString function.

Requirements

See also

MCI

MCI Functions

Command Strings