为什么不发生递归WM_Paint MSG

问题描述

BOOL CALLBACK AboutDlgProc (HWND hDlg, UINT message,
                            WPARAM wParam, LPARAM lParam)
{
	 PAINTSTRUCT ps;
     static HWND hCtrlBlock ;
     static int  iColor, iFigure ;

     switch (message)
     {
     case WM_PAINT:
          PaintTheBlock (hCtrlBlock, iColor, iFigure) ;
          break ;
     }
}

我使用

I use

if (DialogBox (hInstance, TEXT ("AboutBox"), hwnd, AboutDlgProc))
     InvalidateRect (hwnd, NULL, TRUE) ;

用MSG_proc执行一个关于dlg AboutDlgProc

Carry out a about dlg with MSG_proc AboutDlgProc

void PaintTheBlock (HWND hCtrl, int iColor, int iFigure)
{
    InvalidateRect (hCtrl, NULL, TRUE) ;    //May motivate a paint MSG,but why don't ?
     UpdateWindow (hCtrl) ;
     PaintWindow (hCtrl, iColor, iFigure);
}

在PaintTheBlock内部，为什么

Inside PaintTheBlock body,Why

InvalidateRect (hCtrl, NULL, TRUE) ;    //May motivate a paint MSG,but why don't ?
 UpdateWindow (hCtrl) ;

不要按预期激励另一个Paint-MSG？

感谢advcance！

Do not motivate another Paint-MSG as expected?
Thanks in advcance!

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