win32下实现透明窗口

来源：互联网发布：支付宝钓鱼软件编辑：程序博客网时间：2024/04/30 17:25

最开始写透明窗口的代码,在百度了之后,找到了SetLayeredWindowAttributes()这一个函数,但是由于网上案列的缺少,使得很多人无法很好的使用这一个方法,我花了几天的时间写了一个实现窗口透明的类,在这里放出来,给大家使用

#define WS_EX_LAYERED           0x00080000#define LWA_COLORKEY            0x00000001#define LWA_ALPHA               0x00000002class CTransparent  {public:    static BOOL SetTransparentWnd(HWND hWnd, COLORREF crKey, UINT cAlpha, BOOL dwFlags);    static BOOL FreeUser32DLL();    static BOOL ChangeTransparency(HWND hWnd,COLORREF crKey, UINT bAlpha, DWORD dwFlags);    static BOOL LoadUser32DLL();    static TRANFUNC m_pFunc;    static HINSTANCE m_hInstance;    static BOOL initialized;};HINSTANCE CTransparent::m_hInstance = NULL;TRANFUNC  CTransparent::m_pFunc = NULL;BOOL CTransparent::initialized = FALSE;//////////////////////////////////////////////////////////////////////// Construction/Destruction//////////////////////////////////////////////////////////////////////BOOL CTransparent::LoadUser32DLL(){    BOOL bRet = FALSE;    if (!initialized)    {        m_hInstance = LoadLibrary(L"User32.DLL");        if(m_hInstance )         {           //取得SetLayeredWindowAttributes函数指针           m_pFunc=(TRANFUNC)GetProcAddress(m_hInstance, "SetLayeredWindowAttributes");          if(m_pFunc != NULL)            {                 initialized = TRUE;                 bRet = TRUE;            }        }    }    return bRet ;}BOOL CTransparent::ChangeTransparency(HWND hWnd, COLORREF crKey, UINT bAlpha, DWORD dwFlags){    //透明度Sp的值是0-255     //其中0为完全透明应该避免出现    BOOL bRet = FALSE;    if (m_pFunc == NULL)        LoadUser32DLL();        if(m_pFunc != NULL)    {         m_pFunc(hWnd, crKey, bAlpha, dwFlags);          bRet = TRUE;       }    return bRet;}BOOL CTransparent::FreeUser32DLL(){       if(m_hInstance != NULL)     {           FreeLibrary(m_hInstance);         if(m_pFunc != NULL) //置空         m_pFunc = NULL ;        if(initialized != NULL)       //置空         initialized  = NULL ;     }    return TRUE;}BOOL CTransparent::SetTransparentWnd(HWND hWnd, COLORREF crKey, UINT cAlpha, BOOL dwFlags){    BOOL bRet = TRUE;       //要使使窗体拥有透明效果,首先要有WS_EX_LAYERED扩展属性 WS_EX_LAYERED = 0x80000     //SetWindowLong(this->GetSafeHwnd(),GWL_EXSTYLE,GetWindowLong(this->GetSafeHwnd(),GWL_EXSTYLE)^0x80000);    SetWindowLong(hWnd,         GWL_EXSTYLE ,         GetWindowLong(hWnd, GWL_EXSTYLE) | WS_EX_LAYERED);          if(dwFlags)     {        ChangeTransparency(hWnd, crKey, cAlpha, LWA_ALPHA); //设置cAlpha值0-255     }     else     {        ChangeTransparency(hWnd, crKey, cAlpha, LWA_COLORKEY);    //crkey相同色变成透明     }    return bRet;}

在这里调用这个静态方法即可.

HWND m_hMyWnd = ::CreateWindow(L"LoginWndDLL", L"TraWnd", WS_POPUP,(int)((xRes - m_WndWidth) / 2), (int)((yRes - m_WndHeight) / 2), m_WndWidth, m_WndHeight, 0, 0, hInst, 0);//在这里注册一个窗口第三个参数表示窗口的类型CTransparent::SetTransparentWnd((HWND)m_hMyWnd, 0xffffff, 200, 2); //设置窗口透明::ShowWindow(m_hMyWnd, SW_SHOW);

实际上上面这个类使用了动态调用user32.dll中的SetLayeredWindowAttributes函数,通过这个函数来实现窗口透明方式,这个方法与网上的大多数方法类似,不过是加了一个类进行了封装

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