C / C++ / MFC

Cedric Moonen wrote:

You need to call AfxBeginThread only once

msr_codeproject wrote:

Please tell me what is the best method for invoking the AfxBeginThread.

HANDLE hCom = CreateFile("\\\\.\\COM1", ...); // use FILE_FLAG_OVERLAPPED
...
AfxBeginThread(ReadThread, this);
...
UINT ReadThread( LPVOID p )
{
    OVERLAPPED ov = {0};
    ov.hEvent = CreateEvent();

    while (! bDone)
    {
        if (! ReadFile(hCom, ..., &ov))
        {
            if (WaitForSingleObject(ov.hEvent, INFINITE) == WAIT_OBJECT_0)
            {
                GetOverlappedResult(hCom, &ov, ...);
            }
        }
    }
}

msr_codeproject wrote:

Am I going in a right path.

wbgxx wrote:

I want to print the "helloworld" but it print "hell" ,why??

wbgxx wrote:

void show( char str[])
{
for (int i=0; i < sizeof(str)/sizeof(str[0]); ++i)
cout << str[i];
}

void show(char *str)
{
   for (int i=0; i < sizeof(str)/sizeof(str[0]); ++i)
      cout << str[i];
}

void show( char str[], int size)
{
     for (int i=0; i < size; ++i)
     cout << str[i];
}

int main()
{
   char str[]="helloworld!";
   show(str, sizeof(str)/sizeof(str[0]));
   return 0;
}

void show(const char *pStr, int size)
{
	for (int i=0; i<size; ++i)
	{
		cout << pStr[i];
	}
}
 
template <int N>
inline
void show(const char (&a)[N])
{
	show(a, N-1);
}
 
int _tmain(int argc, _TCHAR* argv[])
{
	char str[] = "Hello world!";
	show(str);
 
	cout << endl;
 
	return 0;
}

Chris Meech wrote:

Interesting example, Steve. In your example, does the compiler set N to 12 or 13? I ask because the for loop increments i up to but not including the size, but your template function call passes the value of N-1 to the function. So characters 0-11, all 12 of them, would only be output if the value of N was set to 13. 13 being the 'correct' size when you include the NULL terminator as part of the size of the string. Just an interesting little difference from a lot of the std C string functions.

void show( char str[] )
{
   cout << str;
}

void show (char* str)
{
   cout << str;
}

int main()
{
   char str[] = "helloworld!";
   cout << str;
   return 0;
}

int main()
{
   cout << "helloworld!";
   return 0;
}