MFC中创建透明窗口

第一种  全透明 

1.设置窗口透明

  1: //Set WS_EX_LAYERED on this window
  2: ::SetWindowLong(GetSafeHwnd(),
  3:         GWL_EXSTYLE,
  4: 	   ::GetWindowLongPtr(GetSafeHwnd(),GWL_EXSTYLE)|WS_EX_LAYERED);
  5: 
  6: //Make this window 70% alpha transparent
  7: this->SetLayeredWindowAttributes(0,(255*70)/100,LWA_ALPHA);

2.去除窗口透明

  1: //Remove WS_EX_LAYERED from window style
  2: ::SetWindowLong(GetSafeHwnd(),
  3:     GWL_EXSTYLE,
  4: 	::GetWindowLongPtr(GetSafeHwnd(),GWL_EXSTYLE)&~WS_EX_LAYERED);
  5: //Repaint
  6: this->RedrawWindow();

3.实际运行效果

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第二种    让指定的部分为透明色彩

OnInitialDialog中

COLORREF maskColor = RGB(255,255,255);

SetWindowLong(this->GetSafeHwnd(),GWL_EXSTYLE,GetWindowLong(this->GetSafeHwnd(),GWL_EXSTYLE)^0x80000);

HINSTANCE hInst=LoadLibrary(_T("User32.DLL"));

if(hInst)

{

typedef BOOL (WINAPI * MYFUNC)(HWND , COLORREF,BYTE,DWORD);

MYFUNC fun=NULL;

fun=(MYFUNC)GetProcAddress(hInst,"SetLayeredWindowAttributes");

if(fun)fun(this->GetSafeHwnd(),maskColor,255,1);

FreeLibrary(hInst);

}

在Opaint函数的  else函数中

else

{

CRect rect;

CPaintDC dc(this);

GetClientRect(rect);

dc.FillSolidRect(rect,RGB(255,255,255));

//dc.FillSolidRect(rect,RGB(108,108,108));

CBitmap bmp1,bmp2;

//bmp1.LoadBitmap(IDB_B_1);

bmp1.LoadBitmap(IDB_BITMAP6);

bmp2.LoadBitmap(IDB_BITMAP7);

//bmp2.LoadBitmap(IDB_B_2);

//CPaintDC dc(this); // device context for painting

CDC memDC;

memDC.CreateCompatibleDC(&dc);

CBitmap* pbmpOld;

pbmpOld = memDC.SelectObject(&bmp1);

dc.BitBlt(0, 0, 2000, 1500, &memDC, 0, 0, SRCPAINT);  // 注意最后一个参数

memDC.SelectObject(&bmp2);

dc.BitBlt(0, 0, 2000, 1500, &memDC, 0, 0, SRCAND);  // 注意最后一个参数

memDC.SelectObject(pbmpOld);

memDC.DeleteDC();

CDialog::OnPaint();

}