拆分按钮控件在 MFC 对话框中消失

Question

我几乎是 MFC 的新手。我只是将一个新的拆分按钮控件从工具箱拖放到对话框中。然后我更改了按钮的标题。（最好附上img）我尝试运行应用程序。新按钮消失了。当我将鼠标移到按钮位置上并单击鼠标左键时。一个小矩形看起来像显示一个复选框。

属性参数设置出了什么问题？我可以错过什么吗？为什么没有显示新的拆分按钮？

另外，OnBnClickedSplit1()还没有实现。另一个按钮仍然正常显示。

// MFCApplication5Dlg.cpp : implementation file
//

#include "stdafx.h"
#include "MFCApplication5.h"
#include "MFCApplication5Dlg.h"
#include "afxdialogex.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// CMFCApplication5Dlg dialog



CMFCApplication5Dlg::CMFCApplication5Dlg(CWnd* pParent /*=NULL*/)
    : CDialogEx(CMFCApplication5Dlg::IDD, pParent)
{
    m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CMFCApplication5Dlg::DoDataExchange(CDataExchange* pDX)
{
    CDialogEx::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CMFCApplication5Dlg, CDialogEx)
    ON_WM_PAINT()
    ON_WM_QUERYDRAGICON()
    ON_BN_CLICKED(IDOK, &CMFCApplication5Dlg::OnBnClickedOk)
    ON_EN_CHANGE(IDC_EDIT1, &CMFCApplication5Dlg::OnEnChangeEdit1)
    ON_BN_CLICKED(IDC_SPLIT1, &CMFCApplication5Dlg::OnBnClickedSplit1)
    ON_NOTIFY(BCN_DROPDOWN, IDC_SPLIT1, &CMFCApplication5Dlg::OnBnDropDownSplit1)
END_MESSAGE_MAP()


// CMFCApplication5Dlg message handlers

BOOL CMFCApplication5Dlg::OnInitDialog()
{
    CDialogEx::OnInitDialog();

    // Set the icon for this dialog.  The framework does this automatically
    //  when the application's main window is not a dialog
    SetIcon(m_hIcon, TRUE);         // Set big icon
    SetIcon(m_hIcon, FALSE);        // Set small icon

    // TODO: Add extra initialization here

    return TRUE;  // return TRUE  unless you set the focus to a control
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CMFCApplication5Dlg::OnPaint()
{
    if (IsIconic())
    {
        CPaintDC dc(this); // device context for painting

        SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);

        // Center icon in client rectangle
        int cxIcon = GetSystemMetrics(SM_CXICON);
        int cyIcon = GetSystemMetrics(SM_CYICON);
        CRect rect;
        GetClientRect(&rect);
        int x = (rect.Width() - cxIcon + 1) / 2;
        int y = (rect.Height() - cyIcon + 1) / 2;

        // Draw the icon
        dc.DrawIcon(x, y, m_hIcon);
    }
    else
    {
        CDialogEx::OnPaint();
    }
}

// The system calls this function to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CMFCApplication5Dlg::OnQueryDragIcon()
{
    return static_cast<HCURSOR>(m_hIcon);
}

void CMFCApplication5Dlg::OnBnClickedOk()
{
    CString StrTmp;
    // TODO: Add your control notification handler code here
}


void CMFCApplication5Dlg::OnEnChangeEdit1()
{
    // TODO:  If this is a RICHEDIT control, the control will not
    // send this notification unless you override the CDialogEx::OnInitDialog()
    // function and call CRichEditCtrl().SetEventMask()
    // with the ENM_CHANGE flag ORed into the mask.

    // TODO:  Add your control notification handler code here
}


void CMFCApplication5Dlg::OnBnClickedSplit1()
{
    // TODO: Add your control notification handler code here
}


void CMFCApplication5Dlg::OnBnDropDownSplit1(NMHDR *pNMHDR, LRESULT *pResult)
{
    LPNMBCDROPDOWN pDropDown = reinterpret_cast<LPNMBCDROPDOWN>(pNMHDR);
    *pResult = 0;
    *pResult = 0;
}

Answer 1

您可能需要执行以下操作：

如果您的代码中某处还没有它，请将其添加到 CMFCApplication5App::InitInstance() 函数的开头：

INITCOMMONCONTROLSEX InitCtrls;
InitCtrls.dwSize = sizeof(InitCtrls);
InitCtrls.dwICC = ICC_WIN95_CLASSES;
InitCommonControlsEx(&InitCtrls);

将此添加到您的 .h 文件之一，例如添加到 stdafx.h

#ifdef _UNICODE
#if defined _M_IX86
#pragma comment(linker,"/manifestdependency:\"type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='x86' publicKeyToken='6595b64144ccf1df' language='*'\"")
#elif defined _M_X64
#pragma comment(linker,"/manifestdependency:\"type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='amd64' publicKeyToken='6595b64144ccf1df' language='*'\"")
#else
#pragma comment(linker,"/manifestdependency:\"type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='*' publicKeyToken='6595b64144ccf1df' language='*'\"")
#endif
#endif

但问题可能出在其他地方。为确保您需要向我们展示您的 .rc 文件的相关部分。

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