透明窗体-蒲公英云

透明窗体：

主要代码：

// TestDlg.cpp : implementation file
//
#include "stdafx.h"
#include "Test.h"
#include "TestDlg.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/
// CAboutDlg dialog used for App About
class CAboutDlg : public CDialog
{
public:
    CAboutDlg();
// Dialog Data
    //{
   {AFX_DATA(CAboutDlg)
    enum { IDD = IDD_ABOUTBOX };
    //}}AFX_DATA
    // ClassWizard generated virtual function overrides
    //{
   {AFX_VIRTUAL(CAboutDlg)
    protected:
    virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
    //}}AFX_VIRTUAL
// Implementation
protected:
    //{
   {AFX_MSG(CAboutDlg)
    //}}AFX_MSG
    DECLARE_MESSAGE_MAP()
};
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
    //{
   {AFX_DATA_INIT(CAboutDlg)
    //}}AFX_DATA_INIT
}
void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
    CDialog::DoDataExchange(pDX);
    //{
   {AFX_DATA_MAP(CAboutDlg)
    //}}AFX_DATA_MAP
}
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
    //{
   {AFX_MSG_MAP(CAboutDlg)
        // No message handlers
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()
/
// CTestDlg dialog
CTestDlg::CTestDlg(CWnd* pParent /*=NULL*/)
    : CDialog(CTestDlg::IDD, pParent)
{
    //{
   {AFX_DATA_INIT(CTestDlg)
        // NOTE: the ClassWizard will add member initialization here
    //}}AFX_DATA_INIT
    // Note that LoadIcon does not require a subsequent DestroyIcon in Win32
    m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}
void CTestDlg::DoDataExchange(CDataExchange* pDX)
{
    CDialog::DoDataExchange(pDX);
    //{
   {AFX_DATA_MAP(CTestDlg)
        // NOTE: the ClassWizard will add DDX and DDV calls here
    //}}AFX_DATA_MAP
}
BEGIN_MESSAGE_MAP(CTestDlg, CDialog)
    //{
   {AFX_MSG_MAP(CTestDlg)
    ON_WM_SYSCOMMAND()
    ON_WM_PAINT()
    ON_WM_QUERYDRAGICON()
    ON_WM_MOVE()
    ON_WM_CREATE()
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()
/
// CTestDlg message handlers
BOOL CTestDlg::OnInitDialog()
{
    CDialog::OnInitDialog();
    // Add "About..." menu item to system menu.
    // IDM_ABOUTBOX must be in the system command range.
    ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
    ASSERT(IDM_ABOUTBOX < 0xF000);
    CMenu* pSysMenu = GetSystemMenu(FALSE);
    if (pSysMenu != NULL)
    {
        CString strAboutMenu;
        strAboutMenu.LoadString(IDS_ABOUTBOX);
        if (!strAboutMenu.IsEmpty())
        {
            pSysMenu->AppendMenu(MF_SEPARATOR);
            pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
        }
    }
    // 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
    //初始化GDI+.
    m_Blend.BlendOp=0; //theonlyBlendOpdefinedinWindows2000
    m_Blend.BlendFlags=0; //nothingelseisspecial...
    m_Blend.AlphaFormat=1; //...
    m_Blend.SourceConstantAlpha=255;//AC_SRC_ALPHA
    //窗体样式为0x80000为层级窗体
    DWORD dwExStyle=GetWindowLong(m_hWnd,GWL_EXSTYLE);
    SetWindowLong(m_hWnd,GWL_EXSTYLE,dwExStyle^0x80000);
    //绘制内存位图
    HDC hdcTemp=GetDC()->m_hDC;
    m_hdcMemory=CreateCompatibleDC(hdcTemp);
    HBITMAP hBitMap=CreateCompatibleBitmap(hdcTemp,500,500);
    SelectObject(m_hdcMemory,hBitMap);
    //使用GDI+载入PNG图片
    HDC hdcScreen=::GetDC (m_hWnd);
    RECT rct;
    GetWindowRect(&rct);
    POINT ptWinPos={rct.left,rct.top};
    Graphics graph(m_hdcMemory);            //GDI+中的类
    Image image(L"bk.png",TRUE);            //GDI+中的类
    graph.DrawImage(&image,0,0,267,154);    //后面两个参数要设置成跟图片一样大小，否则会失真
    //使用UpdateLayerWindow进行窗口透明处理
    HMODULE hFuncInst=LoadLibrary("User32.DLL");
    typedef BOOL (WINAPI *MYFUNC)(HWND,HDC,POINT*,SIZE*,HDC,POINT*,COLORREF,BLENDFUNCTION*,DWORD);          
    MYFUNC UpdateLayeredWindow;
    UpdateLayeredWindow=(MYFUNC)GetProcAddress(hFuncInst,"UpdateLayeredWindow");
    SIZE sizeWindow={267,154};
    POINT ptSrc={0,0};
    UpdateLayeredWindow( m_hWnd,hdcScreen,&ptWinPos,&sizeWindow,m_hdcMemory,&ptSrc,0,&m_Blend,2);
    return TRUE;  // return TRUE  unless you set the focus to a control
}
void CTestDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
    if ((nID & 0xFFF0) == IDM_ABOUTBOX)
    {
        CAboutDlg dlgAbout;
        dlgAbout.DoModal();
    }
    else
    {
        CDialog::OnSysCommand(nID, lParam);
    }
}
// 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 CTestDlg::OnPaint() 
{
    if (IsIconic())
    {
        CPaintDC dc(this); // device context for painting
        SendMessage(WM_ICONERASEBKGND, (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
    {
        CDialog::OnPaint();
    }
}
// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CTestDlg::OnQueryDragIcon()
{
    return (HCURSOR) m_hIcon;
}
void CTestDlg::OnMove(int x, int y) 
{
    CDialog::OnMove(x, y);
    // TODO: Add your message handler code here
    CRect rcWindow;                  // 使用MoveWindow函数的示例
    GetWindowRect(rcWindow);
    rcWindow.bottom-=10;
    rcWindow.left+=10;
    rcWindow.right-=10;
    rcWindow.top+=20;
    pChildWnd->MoveWindow(&rcWindow);
}
int CTestDlg::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
    if (CDialog::OnCreate(lpCreateStruct) == -1)
        return -1;
    // TODO: Add your specialized creation code here
    //创建子窗体
    pChildWnd=new COnWindow(this);
    pChildWnd->Create(IDD_ONWINDOW_DIALOG);
    pChildWnd->ShowWindow(SW_SHOW);
    return 0;
}