MFC基于对话框的应用程序添加窗口背景

一

1.将bmp文件放入到程序所在文件夹下并导入bmp文件

2.对类C0Dlg中的OnPaint函数修改代码：

void Czjj0Dlg::OnPaint()
{
 if (IsIconic())
 {
   CPaintDC dc(this); //用于绘制的设备上下文
  SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);
  //使图标在工作区矩形中居中
  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;
  //绘制图标
  dc.DrawIcon(x, y, m_hIcon);
 }
else
{
  CPaintDC dc(this); //窗体DC
  CBitmap bmp; //位图变量
  bmp.LoadBitmap(IDB_BITMAP1); //载入位图资源
  CDC memdc; //临时DC
  memdc.CreateCompatibleDC(&dc); //创建临时DC
  memdc.SelectObject(&bmp); //选中位图对象
  int width, height; //定义位图宽度和高度
  BITMAP bmp1;
  bmp.GetBitmap(&bmp1); //获取位图信息
  width = bmp1.bmWidth; //位图宽度
  height = bmp1.bmHeight; //位图高度
  CRect rect;
  this->GetClientRect(&rect); //获取窗体大小
  //将位图绘制在窗体上作为背景
  dc.StretchBlt(rect.left, rect.top, rect.Width(),rect.Height(), &memdc, 0, 0, width, height, SRCCOPY);
}
}

二

1.将bmp文件放入到程序所在文件夹下并导入bmp文件

2.对类C0Dlg中的OnPaint函数修改代码：

void Czjj0Dlg::OnPaint()
{
if (IsIconic())
 {
   CPaintDC dc(this); //用于绘制的设备上下文
   SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);
  //使图标在工作区矩形中居中
  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;
  //绘制图标
  dc.DrawIcon(x, y, m_hIcon);
}
else
{
  CPaintDC dc(this);
  CRect rect;
  GetClientRect(&rect); 
  CDC dcbmp;
  dcbmp.CreateCompatibleDC(&dc);
  CBitmap Background;
  Background.LoadBitmap(IDB_BITMAP1);
  BITMAP bmp;              
  Background.GetBitmap(&bmp);
  CBitmap* pbmpOld = dcbmp.SelectObject(&Background);
  dc.StretchBlt(0, 0, rect.Width(), rect.Height(), &dcbmp, 0, 0, bmp.bmWidth, bmp.bmHeight, SRCCOPY);
}
}

3.添加WM_ERASEBKGND消息的处理函数，避免背景的闪烁。