VC编程锦集-1

记录vc编程的知识点。由于vc知识点小而零碎，所以使用小锦集记录较合适。

1. 设置对话框的颜色或背景：

OnEraseBkgnd()：适合修改对话框背景

OnPaint()：适合完成复杂的显示操作

OnCtlColor()：适合修改对话框上控件的颜色

调用顺序：对话框初始化完毕，显示时调用OnSize()->OnEraseBkgnd()->OnPaint()->OnCtlColor()

2. Windows窗口刷新机制：

当窗口出现无效区域时，刷新显示无效区域。

1）当窗口没有无效区域，即使收到WM_PAINT消息，程序也不作处理；

2）当窗口有无效区域，收到WM_PAINT消息后，调用OnPaint()刷新窗口。

主动刷行窗口：1：RedrawWindow；2：Invalidate(TRUE); （UpdateWindow()）。

以上两条参考：http://www.cnblogs.com/lidabo/archive/2012/07/03/2574702.html

3. 屏蔽Statusbar默认提示：

1）.h添加声明：afx_msg LRESULT OnSetMessageString(WPARAM, LPARAM);

2）添加消息映射：ON_MESSAGE(WM_SETMESSAGESTRING, OnSetMessageString)

3）实现函数：

LRESULT CMainFrame::OnSetMessageString(WPARAM wParam, LPARAM lParam)
{
    LRESULT lr = CFrameWnd::OnSetMessageString(wParam, lParam);

    if ((wParam == AFX_IDS_IDLEMESSAGE)
        || (wParam == ID_VIEW_TOOLBAR) || (wParam == ID_VIEW_STATUS_BAR) || (wParam == ID_APP_ABOUT))
    {
        SetMessageText(L"");
        return S_OK;
    }

    return lr;

}

4. 动态改变菜单项在状态栏中的提示：
1）通过ClassWizard添加重载函数：virtual void GetMessageString(UINT nID, CString& rMessage) const;

2）完善实现如下：

void CMainFrame::GetMessageString(UINT nID, CString& rMessage) const
{
    // TODO: Add your specialized code here and/or call the base class

    if(nID == ID_EXAM_NEW) //  按ID修改提示
    {
        rMessage = "Create new file!";
        return;
    }

    return CFrameWnd::GetMessageString(nID, rMessage);

}

5. 指定 BROWSEINFOW 的初始路径

//
//  brief : 指定 BROWSEINFOW 的初始路径
int CALLBACK BrowseCallbackProc(HWND hwnd, UINT uMsg, LPARAM lParam, LPARAM lpData)
{
    if  (uMsg == BFFM_INITIALIZED )
    {
        ::SendMessage(hwnd, BFFM_SETSELECTION, TRUE, lpData);
    }
    return 0;
}
void SelectDir()
{
    BROWSEINFOW bi;
    bi.hwndOwner = this->m_hWnd;
    bi.pidlRoot = NULL;
    bi.pszDisplayName = wszPath;    //  Pointer to a buffer to receive the display name of the folder selected by the user.
    bi.lpszTitle = L"请选择目录：";    //  Pointer to a null-terminated string that is displayed above the tree view control in the dialog box.
    bi.ulFlags = 0;
    bi.lpfn = BrowseCallbackProc;
    bi.lParam = (LPARAM)GetImageDir();
    bi.iImage = 0;
    //弹出选择目录对话框
    LPITEMIDLIST lp = SHBrowseForFolderW(&bi);

    if(lp && SHGetPathFromIDList(lp, wszPath))
    {
        //  wszPath
    }
}

6. 获取屏幕矩阵

//  获取全屏矩阵
int nScreenCX = ::GetDeviceCaps(GetDC()->m_hDC, HORZRES);
int nScreenCY = ::GetDeviceCaps(GetDC()->m_hDC, VERTRES);
//  获取除系统任务栏外的矩阵
RECT rect;
SystemParametersInfo(SPI_GETWORKAREA, 0, &rect, 0);
//  获取除 vs2010任务栏 + 系统任务栏外的矩阵
int nScreenCX = ::GetSystemMetrics(SM_CXFULLSCREEN);
int nScreenCY = ::GetSystemMetrics(SM_CYFULLSCREEN);

7. 消息窗口，隐藏的、用于接收消息，设置方法

::SetParent(pMyDlg->m_hWnd, HWND_MESSAGE);
//Message-Only Windows:
//  A message-only window enables you to send and receive messages.
//  It is not visible, has no z-order, cannot be enumerated, and does not receive broadcast messages.
//  The window simply dispatches messages.