提问：关于 “改变窗口大小的程序时，按钮不能正确地改变大小” 的问题

[ysysbaobei]

题目要求：
当你执行上面改变窗口大小的程序时，你就会发现按钮自己能正确地改变大小。

问题：
发现未能实现，窗口大小改变。按钮大小跟着改变的功能

// button3.cpp

#include <afxwin.h>
#define IDB_BUTTON 100

// Declare the application class
class CButtonApp: public CWinApp
{
public:
	virtual BOOL InitInstance();
};

// Create an instance of the application class
CButtonApp ButtonApp;

// Declare the main window class
class CButtonWindow: public CFrameWnd
{
	CButton *button;
public:
	CButtonWindow();
	afx_msg void HandleButton();
	afx_msg void Onsize(UINT, int, int);
	DECLARE_MESSAGE_MAP()
};

// A message handler function
void CButtonWindow::HandleButton()
{
	MessageBeep(-1);
}

// A message handler function
void CButtonWindow::Onsize(UINT nType, int cx, int cy)
{
	CRect r;
	GetClientRect(&r);
	r.InflateRect(-20, -20);
	button->MoveWindow(&r);
}

// The message map
BEGIN_MESSAGE_MAP(CButtonWindow, CFrameWnd)
ON_BN_CLICKED(IDB_BUTTON, HandleButton)
ON_WM_SIZE()
END_MESSAGE_MAP()

// The InitInstace function is called once
// when the application first executes
BOOL CButtonApp::InitInstance()
{
	m_pMainWnd = new CButtonWindow();
	m_pMainWnd->ShowWindow(m_nCmdShow);
	m_pMainWnd->UpdateWindow();
	return TRUE;
}

// The constructor for the window class
CButtonWindow::CButtonWindow()
{
	CRect r;
	// Create the window itself
	Create(NULL,
			"CButton Tests",
			WS_OVERLAPPEDWINDOW,
			CRect(0, 0, 200, 200));
	// Get the size of the client rectangle
	GetClientRect(&r);
	r.InflateRect(-20, -20);

	// Create a button
	button = new CButton();
	button->Create("Push me",
					WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
					r,
					this,
					IDB_BUTTON);
}

[ysysbaobei]

顶上去

[dahua010]

你的
button
实例化对象了么？换句话说，和界面的BUTTON关联了么

[ysysbaobei]

[Quote=引用 2 楼 dahua010 的回复:]
你的
button
实例化对象了么？换句话说，和界面的BUTTON关联了么
[/Quote]

CButtonWindow::CButtonWindow()
{
    CRect r;
    // Create the window itself
    Create(NULL,
            "CButton Tests",
            WS_OVERLAPPEDWINDOW,
            CRect(0, 0, 200, 200));
    // Get the size of the client rectangle
    GetClientRect(&r);
    r.InflateRect(-20, -20);

    // Create a button
    button = new CButton();
    button->Create("Push me",
                    WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
                    r,
                    this,
                    IDB_BUTTON);
}

这段代码实例化 和 关联了吧

[ysysbaobei]

发现了问题了
afx_msg void Onsize(UINT, int, int);
void CButtonWindow::Onsize(UINT nType, int cx, int cy)
其中的Onsize 应该为 OnSize，改过来后，就正确了
结贴了