为什么 SetScrollInfo() 函数向 WndProc() 发送 WM_SIZE 消息? [英] Why does the SetScrollInfo() function sends a WM_SIZE message to WndProc()?

问题描述

为什么 SetScrollInfo() 函数向 WndProc() 发送 WM_SIZE 消息?

Why does the SetScrollInfo() function sends a WM_SIZE message to WndProc() ?

EDIT 显然，这是 WinAPI 中的一个错误.正在发送 WM_SIZE 消息，因为我忘记包含 WS_HSCROLL |WS_VSCROLL 窗口创建中的样式.更正后，WM_SIZE 将不再发送.谢谢.

EDIT Apparently, this is a bug in the WinAPI. The WM_SIZE message was being sent because I forgot to include the WS_HSCROLL | WS_VSCROLL styles in the window creation. Once that was corrected, the WM_SIZE isn't being sent anymore. Thanks.

推荐答案

由于这是一个记录在案的功能，因此它可能不是错误.

Since this is a documented feature, it's likely not a bug.

来自 http://msdn.microsoft.com/en-us/library/windows/desktop/ms632646.aspx:

备注

如果 SetScrollPos 或 MoveWindow 函数作为 WM_SIZE 消息的结果为子窗口调用，bRedraw 或 bRepaint 参数应为非零值以重新绘制窗口.

If the SetScrollPos or MoveWindow function is called for a child window as a result of the WM_SIZE message, the bRedraw or bRepaint parameter should be nonzero to cause the window to be repainted.

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