clear serial port??

Hi guys:

Sometimes when I transmmit the data from one com port to the other. And there are always "something" left in the com port even after I closed the program. I've to restart the computer then. It is kinda of strange, So is there function or way to clear the serial port after the program closed?

I would appreciate for any help

Check out the code I attached in this thread, SFile.zip.
Use the object if you like, otherwise, just take a look at the PurgeComm() method.

gg

Hi Codeplug
When I was runing the program, I got such error:

Compiling...
SFile.cpp
Linking...
LIBCD.lib(wincrt0.obj) : error LNK2001: unresolved external symbol _WinMain@16
Debug/SFile.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.
Creating browse info file...

SFile.exe - 2 error(s), 0 warning(s)

What shall I do? Thanks

SFile.zip only contains the SFile class. There is no main() or WinMain() that actually uses it.

gg

Thanks, but BTW: in

BOOL ReadFile(
HANDLE hFile, // handle to file
LPVOID lpBuffer, // data buffer
DWORD nNumberOfBytesToRead, // number of bytes to read
LPDWORD lpNumberOfBytesRead, // number of bytes read
LPOVERLAPPED lpOverlapped // overlapped buffer
)

is it always nNumberOfBytesToRead = lpNumberOfBytesRead??

for example if I set ReadFile() to read 10 bytes at a time from input buffer of COM1, so lpNumberOfBytesRead is 10 bytes too?
Am I right??

Thanks

*lpNumberOfBytesRead is an output parameter and gets set to 0 first thing by ReadFile().
When ReadFile() returns, *lpNumberOfBytesRead will be 10 only if it read 10 bytes.

gg

Hey I was jsut wondering where you got this class from? Or did you write it yourself?