C / C++ / MFC

Blake Miller wrote:

Remember to call CloseServiceHandle on the returned handle if the open is successful, or else you will have handle leaks in your application

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

toxcct wrote:

what is "singleton class"

//Singleton class
class CSingleton
{
private:
    CSingleton() {} // singleton construcor PRIVATE
    ~CSingleton() {} // singleton destructor PRIVATE

public:
    // For getting a pointer to the one and only instance of CSingleton
    static CSingleton* Instance()
    {
        static CSingleton Singleton;
        return &Singleton;
    }
};

//( for example ) 
void CMainFrame::OnYourHandler( CCmdUI* pCmdUI ) 
{
 pCmdUI->Enable( someBooleanValue );
}

<br />
int userNumb;<br />
SendMessage(HANDLE_TO_EDIT_BOX, WM_GETTEXT, (WPARAM)10, (LPARAM)userNumb);<br />
if(userNumb<0)<br />
{<br />
//etc...<br />
}<br />
else<br />
{<br />
//Error!<br />
}<br />

Loc Milkyway wrote:

Where I overload WM_CHAR

Loc Milkyway wrote:

How I call OnChar().

void CMyEdit::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags) {
    TCHAR c = (TCHAR) nChar;
    if(::isdigit(c) || c == '.') {
        //call base class OnChar() function
        CEdit::OnChar(nChar, nRepCnt, nFlags);
    }
}