asked on

windows program

Hi all,
I got this program from expert Mokule.
how do i run this? I am new to c++\
I mean is it
File->new workspace->win32 application-> empty project
file -> new->c++ file

See, i need a simple program for my Single board computer on a communication box
the box , has several ports, one connected to a security camera
there is an Mpeg frame grabber harwdware within the box
another to microphon etc
I need t a simple program tht tells me. yes, the microphone is connected or not
yes, the camera is connected or not.
the device driver of the frame grabber does have some inheretnt detection, like it does tell me when a video signal is lost
i want to do a small implementation just to see if the ports are conneected or not

the program beloe does seem to have a purpose like tht...
could u tell me how to go abt running this

Program
#include <windows.h>
#include <assert.h>

HANDLE hCom;
OVERLAPPED o;
BOOL fSuccess;
DWORD dwEvtMask;

hCom = CreateFile( "COM1",
GENERIC_READ | GENERIC_WRITE,
0, // exclusive access
NULL, // default security attributes
OPEN_EXISTING,
FILE_FLAG_OVERLAPPED,
NULL
);

if (hCom == INVALID_HANDLE_VALUE)
{
// Handle the error.
return;
}

// Set the event mask.

fSuccess = SetCommMask(hCom, EV_CTS | EV_DSR | EV_BREAK);

if (!fSuccess)
{
// Handle the error.
return;
}

// Create an event object for use in WaitCommEvent.

o.hEvent = CreateEvent(
NULL, // default security attributes
FALSE, // auto reset event
FALSE, // not signaled
NULL // no name
);

assert(o.hEvent);

if (WaitCommEvent(hCom, &dwEvtMask, &o))
{
if (dwEvtMask & EV_DSR)
{
// To do.
}

if (dwEvtMask & EV_CTS)
{
// To do.
}

if (dwEvtMask & EV_BREAK)
{
// To do.
}
}

itsmeandnobodyelse

Copy the code above, create a new project using File - New - Win32 Console Application, choose a new name, and select Empty Project.

If you got it, open a new text file, past your code to it, select all, use <TAB> to indent all code, add

void main()
{

below the #include statements

and

}

to the end.

Store the file to the new project directory using .cpp extension, e. g. <project_name>.cpp .

Right-click on the file and choose Insert.. to <project_name>.

Build project.

That it is.

Regards, Alex

itsmeandnobodyelse

A Win32 Application will work also, but you have WinMain(...) function and not main().

If you want to have some output you need to create windows or write to output window of Visual Studio using OutputDebugString() function.

With a console application you may use cout and cin to get a simple input/output in the console window.

#include <iostream>

void main()
{
cout << "Hello World" << endl << endl;

cout << "Type any key to quit ==>" << endl;

char c;
cin >> c;
}

Regards, Alex

vikasgkutty

ASKER

ok, than q....let me just try it out and hgte back to u

vikasgkutty

ASKER

why does it give me an error for endl, cout etc
i did inlcue iostream

rstaveley

Add line line...

using namespace std;

... after the includes.

vikasgkutty

ASKER

cool,
whats tht supposed to do

vikasgkutty

ASKER

it worked

vikasgkutty

ASKER

it worked

vikasgkutty

ASKER

Ok,...
This program here seems to be doing some port detection
its checks DSR , CTS lines
i guess.. do u think this can be used to acheive what i need
i.e
IS the port disconnected or connected?

itsmeandnobodyelse

Set a break-point (hand-symbol) to line containing 'return' and start prog by F5 key.

if (!fSuccess)
{
// Handle the error.
return; // SET HERE THE BREAK POINT
}

If it stops at that point it didn't connect and you may post us the contents of variable fSuccess.

If it didn't stop, it connects and you may set break points below to see what happens.

Regards, Alex

vikasgkutty

ASKER

was doing tht,
it tells me tht breakpoint is not positioned on correctlines, and it shifts the break point outside tht
if (!fSuccess)
{
// Handle the error.
return; // SET HERE THE BREAK POINT
}
o.hEvent = CreateEvent(
                  NULL, // default security attributes
                  FALSE, // auto reset event
                  FALSE, // not signaled
                  NULL // no name
                  );//SHIFTS it here

Vikas

ASKER CERTIFIED SOLUTION

itsmeandnobodyelse

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