如何制作半透明窗口

Question

向各位大虾请教一个问题，如何象phtoshop那样在客户区拉出一个矩形窗口后，再该拉出的区域中用半透明颜色填充。谢谢

Answer 1

BOOL CYourDlg::OnInitDialog()
{
         CDialog::OnInitDialog();         SetWindowLong(this->GetSafeHwnd(),GWL_EXSTYLE,GetWindowLong(this->GetSafeHwnd(),GWL_EXSTYLE)^0x80000);
HINSTANCE hInst = LoadLibrary("User32.DLL"); 
if(hInst) 
{ 
typedef BOOL (WINAPI *MYFUNC)(HWND,COLORREF,BYTE,DWORD); 
MYFUNC fun = NULL;
//取得SetLayeredWindowAttributes函数指针 
fun=(MYFUNC)GetProcAddress(hInst, "SetLayeredWindowAttributes");
if(fun)fun(this->GetSafeHwnd(), 0, 192, 2); 
FreeLibrary(hInst); 
}
}

Answer 2

呵呵, 被楼上的占先了.
void TransparencyWindow(HWND hWnd)
{
typedef BOOL (WINAPI *MYFUNC)(HWND hwnd, COLORREF crKey, BYTE bAlpha, DWORD dwFlags);
HINSTANCE hInstance = LoadLibrary("user32.dll");
MYFUNC TransWindow;
TransWindow = (MYFUNC)GetProcAddress(hInstance, _T("SetLayeredWindowAttributes"));
if (TransWindow)
{
SetWindowLong(hWnd, GWL_EXSTYLE, (GetWindowLong(hWnd, GWL_EXSTYLE))|0x80000L);
TransWindow(hWnd, 255, (255*80)/100, 0x02);
FreeLibrary(hInstance);
}
}调用时传递你的窗口句柄进去..