| DWORD mciSendString(lpstrCommand, lpstrReturnString, uReturnLength, hCallback) | |||
| LPCSTR lpstrCommand; | |||
| LPSTR lpstrReturnString; | |||
| UINT uReturnLength; | |||
| HANDLE hCallback; |
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.
lpstrCommand
Points to an MCI command string of the form:[command] [device] [parameters].
lpstrReturnString
Specifies a buffer for return information. If no return information is needed, you can specify NUL for this parameter.
uReturnLength
Specifies the size of the return buffer specified by lpstrReturnString.
hCallback
Specifies a handle to a window to call back if “notify” was specified in the command string.
Returns zero if the function was successful. Otherwise, it returns error information. The low-order word of the returned DWORD contains the error return value.
To get a textual description of mciSendString return values,pass the return value to mciGetErrorString.
The error returns listed for mciSendCommand also apply to mciSendString. The following error returns are unique to mciSendString:
| Value | Meaning |
| MCIERR_BAD_CONSTANT | Unknown value for parameter. |
| MCIERR_BAD_INTEGER | Invalid or missing integer in command. |
| MCIERR_DUPLICATE_FLAGS | A flag or value was specified twice. |
| MCIERR_MISSING_COMMAND_STRING | No command was specified. |
| MCIERR_MISSING_DEVICE_NAME | No device name was specified. |
| MCIERR_MISSING_STRING_ARGUMENT | A string value was missing from the command. |
| MCIERR_NEW_REQUIRES_ALIAS | An alias must be used with the “new” device name. |
| MCIERR_NO_CLOSING_QUOTE | A closing quotation mark is missing. |
| MCIERR_NOTIFY_ON_AUTO_OPEN | The “notify” flag is illegal with auto-open. |
| MCIERR_PARAM_OVERFLOW | The output string was not long enough. |
| MCIERR_PARSER_INTERNAL | Internal parser error. |
| MCIERR_UNRECOGNIZED_KEYWORD | Unknown command parameter. |
mciGetErrorString, mciSendCommand