Hi ,
I have written a basic win32 application which will draw a rectangle
once we click a button. But whenever we resize or Minimizs/Maximize the window
, it is being painted by background. I don't understand which event I need to
handle. I was suggested to use WM_PAINT/WM_SIZE , but while handling this
event , when we don't know how many rectangles etc were drawn on client
surface how can we restore them once we resized .
My code is:
#include<afxwin.h>
#define btnmsg WM_USER+10
class paintfrm:public CFrameWnd
{
CButton *btn;
public:
paintfrm()
{
btn=new CButton();
Create(NULL,"Paint");
btn->Create("Abcd",WS_CHILD|WS_VISIBLE|BS_PUSHBUTTON,CRect(0,0,50,50),this,btnmsg);
}
void onpush()
{
CClientDC dc(this);
POINT pnt;
pnt.x=50;
pnt.y=50;
dc.MoveTo(pnt);
RECT r;
r.left=r.top=50;
r.right=r.bottom=100;
dc.Rectangle(&r);
}
DECLARE_MESSAGE_MAP()
};
BEGIN_MESSAGE_MAP(paintfrm,CFrameWnd)
ON_COMMAND(btnmsg,onpush)
END_MESSAGE_MAP()
class myapp:public CWinApp
{
public:
BOOL InitInstance()
{
m_pMainWnd=new paintfrm();
m_pMainWnd->ShowWindow(1);
m_pMainWnd->UpdateWindow();
return 1;
}
};
myapp app;
Thanks&Regards,
Gopi.k
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