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How can I get EnumWindows to list all windows?

I'm assuming, what I'm asking should actually be the default, but I'm experiencing some behavior I don't understand.

#include "stdafx.h"

using namespace std;

BOOL CALLBACK enumWindowsProc(
  __in  HWND hWnd,
  __in  LPARAM lParam
) {
  if( !::IsIconic( hWnd ) ) {
    return TRUE;
  }

  int length = ::GetWindowTextLength( hWnd );
  if( 0 == length ) return TRUE;

  TCHAR* buffer;
  buffer = new TCHAR[ length + 1 ];
  memset( buffer, 0, ( length + 1 ) * sizeof( TCHAR ) );
  
  GetWindowText( hWnd, buffer, length + 1 );
  tstring windowTitle = tstring( buffer );
  delete[] buffer;

  wcout << hWnd << TEXT( ": " ) << windowTitle << std::endl;

  return TRUE;
}

int _tmain( int argc, _TCHAR* argv[] ) {
  wcout << TEXT( "Enumerating Windows..." ) << endl;
  BOOL enumeratingWindowsSucceeded = ::EnumWindows( enumWindowsProc, NULL );
  cin.get();
  return 0;
}

If I invoke that code, it will list all minimized windows: enter image description here

Now, I'm no longer interested in only the minimized windows, now I want all of them. So I remove the IsIconic check:

BOOL CALLBACK enumWindowsProc(
  __in  HWND hWnd,
  __in  LPARAM lParam
) {
  /*
  if( !::IsIconic( hWnd ) ) {
    return TRUE;
  }
  */

  int length = ::GetWindowTextLength( hWnd );
  if( 0 == length ) return TRUE;

  TCHAR* buffer;
  buffer = new TCHAR[ length + 1 ];
  memset( buffer, 0, ( length + 1 ) * sizeof( TCHAR ) );
  
  GetWindowText( hWnd, buffer, length + 1 );
  tstring windowTitle = tstring( buffer );
  delete[] buffer;

  wcout << hWnd << TEXT( ": " ) << windowTitle << std::endl;

  return TRUE;
}

Now I get all windows except the minimized ones (none of the previously listed window handles are listed this time): enter image description here

For completeness, this is the stdafx.h:

#pragma once

#include "targetver.h"


#include <iostream>
#include <map>
#include <string>

namespace std {
  #if defined _UNICODE || defined UNICODE
    typedef wstring tstring;
  #else
    typedef string tstring;
  #endif
}

#include <stdio.h>
#include <tchar.h>
#include <Windows.h>
#include <psapi.h>

What am I doing wrong?

like image 204
Oliver Salzburg Avatar asked Apr 20 '12 12:04

Oliver Salzburg


People also ask

What is EnumWindows?

Enumerates all top-level windows on the screen by passing the handle to each window, in turn, to an application-defined callback function. EnumWindows continues until the last top-level window is enumerated or the callback function returns FALSE.

What is Hwnd?

A Windows window is identified by a "window handle" ( HWND ) and is created after the CWnd object is created by a call to the Create member function of class CWnd . The window may be destroyed either by a program call or by a user's action. The window handle is stored in the window object's m_hWnd member variable.


1 Answers

Well, wcout.flush() never works, however wcout.clear() fixes your code, at least for me.

wcout << hWnd << TEXT( ": " ) << windowTitle << std::endl;
wcout.clear();
return TRUE;

And I know that this question is already one year old, however it's never too late to answer.

like image 164
FrogTheFrog Avatar answered Oct 20 '22 17:10

FrogTheFrog