Why did it fail?

I attempted to use WindowViewer to view all the hidden windows the Windows Task Manager makes you aware of. WindowViewer does not show those: at the location of where this hidden window is, it obtains the bitmap of what is visible there.

Core code


//std::vector<boost::shared_ptr<TFormImage> > m_v

//TFormImage has one member, a TImage called Image

 

HWND handle = GetWindow(GetForegroundWindow(),GW_HWNDFIRST);

int index = 0;

 

while(handle)

{

  const int sz = 256;

  char buffer[sz];

  GetWindowText(handle,buffer,sz);

  const std::string text(buffer);

  if (text.empty())

  {

    handle = GetNextWindow(handle,GW_HWNDNEXT);

    continue;

  }

 

  if (index == static_cast<int>(m_v.size()))

  {

    boost::shared_ptr<TFormImage> i(new TFormImage(0));

    i->Image->Picture->Bitmap->PixelFormat = pf32bit;

    i->Caption = "";

    m_v.push_back(i);

  }

 

  RECT rect;

  GetWindowRect(handle,&rect);

  const int width  = rect.right  - rect.left;

  const int height = rect.bottom - rect.top;

 

  Graphics::TBitmap * b = m_v[index]->Image->Picture->Bitmap;

  assert(b);

  assert (b->PixelFormat == pf32bit);

 

  HDC dc = GetDC(handle);

  if (!dc)

  {

    handle = GetNextWindow(handle,GW_HWNDNEXT);

    continue;

  }

 

  m_v[index]->ClientWidth = width;

  m_v[index]->ClientHeight = height;

  b->Width  = width;

  b->Height = height;

 

  BitBlt(b->Canvas->Handle, 0, 0, b->Width, b->Height, dc, 0, 0, SRCCOPY);

  b->Modified = true;

 

  ReleaseDC(handle,dc);

  handle = GetNextWindow(handle,GW_HWNDNEXT);

  ++index;

}

Licence


Window Viewer, tool to view all windows

Copyright (C) 2010  Richel Bilderbeek

 

This program is free software: you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation, either version 3 of the License, or

(at your option) any later version.

 

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program.  If not, see <http://www.gnu.org/licenses/>.

Go back to Richel Bilderbeek's C++ page.

Go back to Richel Bilderbeek's homepage.

(C++ tool) WindowViewer

Why did it fail?

Core code

Licence