RS232 with the MSCOMM.ocx

[Supersnow]

Hi,

I am trying to write two different sets of characters to an external Microprocessor which supports RS232. I need to send commands such as "GO;" and "STOP;".

The external processor works fine with HyperTerminal. I thought I could use the MSComm active X control but it does not seem to work? Here is teh code im using

CString strOutput;

strOutput = ("GO;"

m_Serial.SetCommPort(1);
m_Serial.SetSettings("9600,n,8,1"
m_Serial.SetPortOpen(TRUE);
m_Serial.SetOutput(COleVariant(strOutput));
m_Serial.SetPortOpen(FALSE);

Any help would be very welcome

 

[Polkadot]

I think your problem is that you are trying to caste a CString object as a variant. This won't work. Instead you might try the following.

CString strOutput; strOutput = ("GO;" // No change here
VARIANT vtData; vtData.vt=VT_BSTR; /* Create a variant data structure and initialise it as type BSTRING*/
vtData.bstrVal=strOutput.AllocSysString(); /* Copy the
Cstring to the VARIANT data structure*/

m_Serial.SetCommPort(1);
m_Serial.SetSettings("9600,n,8,1"
m_Serial.SetPortOpen(TRUE);
m_Serial.SetOutput(vtData);
m_Serial.SetPortOpen(FALSE);

Can you help me with my problem? -There is a C function that allows C to call another executeable as if from a command line prompt eg.

system("c:\type c:\autoexec.bat"

In C++ this will open a Dos window and type the autoexec. Note however that this doesn't work for windows .exe files.

Question? how can I get C++ to call another windows application in the same way as if I click on an icon or go to the Start menu click on run and type in Excel. (which in this instance will start up Excel) - You can contact me at Andrew.Carmichael@polkadotuk.demon.co.uk