Hi
I am trying to change a piece of code that ran in CClientDC into
CPaintDC on VC 6.
I have tried using ...
//win32 app
// needs multi threading
#include <afxwin.h>
#include <afx.h>
class A_Std_Window :public CFrameWnd
{
CPoint m_StartPoint, m_EndPoint;
public:
A_Std_Window()
{
Create(NULL,"put window title here");
}
void OnLButtonUp();
DECLARE_MESSAGE_MAP()
};
BEGIN_MESSAGE_MAP( A_Std_Window, CFrameWnd)
ON_WM_LBUTTONUP() //Macro to map the left button click to the
handler
END_MESSAGE_MAP()
void A_Std_Window::OnLButtonUp()
{
// TODO: Add your message handler code here and/or call default
m_StartPoint.x=40;
m_StartPoint.y=50;
m_EndPoint.x=4;
m_EndPoint.y=5;
CPaintDC dc(this); //paint here
dc.MoveTo(m_StartPoint);
dc.LineTo(m_EndPoint);
dc.FillSolidRect(0,0,40,40, RGB(255,0,0));
}
class MyApp :public CWinApp
{
A_Std_Window *windo; // create a window pointer
public:
BOOL InitInstance()
{
windo = new A_Std_Window();
m_pMainWnd = windo;
m_pMainWnd->ShowWindow(1);
return 1;
}
};
MyApp theApp;
....
It compiles but does exactly nothing
Could someone please tell me what I am doing wrong
Thanks
Bruce
1. CPaintDC should be used only in the OnPaint() handler.
2. All painting should be done in OnPaint().
3. The correct way to trigger a paint event is to call Invalidate() or