TransmitCommChar
The TransmitCommChar
function transmits a specified character ahead of any pending data in the
output buffer of the specified communications device.
BOOL TransmitCommChar(
|
HANDLE hFile, |
// handle of
communications device |
|
char cChar |
// character to
transmit |
|
); |
|
Parameters
hFile
Identifies
the communications device. The CreateFile function returns this handle.
cChar
Specifies the
character to be transmitted.
Return Values
If the
function succeeds, the return value is nonzero.
If the
function fails, the return value is zero. To get extended error information,
call GetLastError.
Remarks
The TransmitCommChar
function is useful for sending an interrupt character (such as a CTRL+C) to a host
system.
If the device
is not transmitting, TransmitCommChar cannot be called repeatedly. Once TransmitCommChar
places a character in the output buffer, the character must be transmitted
before the function can be called again. If the previous character has not yet
been sent, TransmitCommChar returns an error.
Character
transmission is subject to normal flow control and handshaking. This function
can only be called synchronously.
See Also