C / C++ / MFC

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;
}

Code-o-mat wrote:

What i did was to create a few dialogs with a whole bunch of edit controls on them that let the user hammer in all kinds of data, mostly numbers, when the OK button is hit, i called UpdateData to move the user's entries into integer values and then check these for correctness and display a message box if something's wrong. This works ok as long as the user entered something into the edit fields, but if the user leaves one empty, then during the Dataexchange process a nice little "Please enter an integer" message box is spit up...

Code-o-mat wrote:

before calling DoDataExhcnage put a "0" into every numeric edit field on the dialog that is empty