Sending Command Messages
The Microsoft Windows operating system provides two functions for sending
command messages to devices and to query devices for error information:
mciSendCommand and
mciGetErrorString. The
mciSendCommand function
sends a command message to an MCI device. The
mciGetErrorString function returns the error string corresponding to an error number.
The
mciSendCommand function returns zero if successful. If the function fails, the low-order
word of the return value contains an error code. You can pass this error code to
mciGetErrorString to get a text description of it.
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