Thread: Windows Application OnPaint() Function

Good day,

My IDE : vs 2005

My windows forms application inclued one main window and two sub windows. There is a beautiful skin color at the main window; but there is no skin color for the other two windows)

When i right click my "void CMainDlg::OnPaint()" and check "Find All References".
3 match found:
afxms_.h (static_cast< void (AFX_MSG_CALL CWnd::*)(void) > ( &ThisClass :: OnPaint)) },
mainDlg.cpp: void CSECS_AMECDlg::OnPaint();
mainDlg.h: afx_msg void OnPaint(); (protected declared)

My question,
1. does OnPain() Function was called by system thread automaically when my windows forms app load.

2. When i add the OnPain() function for the two sub windows, the OnPain() function won't be called automatically.

Could you tell me more about OnPaint() ......


thanks!

More Debug Information.

If i keep on Step Out(Shift + F11), the Yellow Arrow will Just to "wincore.cpp".....then the Yellow Arrow Will Jumed into a "Disassembly" window....

And if i keep on Step Over (F10), same !!!

?

trace by myself :-)

Currently i understand the OnPoint() function for my project.

The problem is not the window Forms application issue, it is a MFC application. Windows send message to my application.l When message WM_PAINT arrives then MFC Library calls my OnPaint function. a line like
On_WM_PAINT()

Now i already understand this scenario.

Thanks!

Originally Posted by userpingz

Windows send message to my application.l When message WM_PAINT arrives then MFC Library calls my OnPaint function. a line like
On_WM_PAINT()

That sounds correct.

You can also send your own WM_PAINT message with;

InvalidateRect() //send a paint message
UpdateWindow() //bypass the windows message queue and post the paint message directly to the window (much faster)