为什么不发生递归WM_Paint MSG [英] Why the recursive WM_Paint MSG don't occur

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!

推荐答案

并且认为消息可以递归显示完全混淆递归。递归是基于堆栈的，不是很明显吗？它仅适用于功能。并且以编程方式 WM_PAINT 由失效触发。你需要完全重新思考你的渲染逻辑。

-SA

And idea that a message could be recursive shows complete confusion about recursion. Recursion is based on stack, isn''t it obvious? It works only on functions. And programmatically WM_PAINT is triggered by invalidation. You need to completely re-think your rendering logic.

—SA

你应该阅读有关 DialogBox（）的文档功能 [ ^ ]，以及解释对话框如何运作的所有其他部分。

You should read the documentation on the DialogBox() function[^], and all the other parts explaining how dialog boxes operate.

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