Re: Why can't open other com port


Bruno van Dooren 寫道：

I want to open a com port that is from PCI board.
I can control that port ( com 13 ) by VB with MSCOMM control, work
well.

Now, it can't work in VC, could you please advice?

If you try to run your VC code, the VB program is closed, right?
COM ports can be opened by only 1 process at a time.

void InitialiseWindows(char *arg)
{
DCB
config;

COMMTIMEOUTS
timeouts;

// Open the com port required

com_handle = CreateFile
(
arg,
GENERIC_READ | GENERIC_WRITE,
0,
0,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,

What is the text in arg?

--

Kind regards,
Bruno van Dooren
bruno_nos_pam_van_dooren@xxxxxxxxxxx
Remove only "_nos_pam"

Hi,
Sure, VB already close.
um..
Here is my call method:

int main(int argc, char* argv[])
{
argv[1] = "com2";
InitialiseWindows(argv[1]);
return 0;
}

.

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